diff --git a/.github/bump_version.py b/.github/bump_version.py
new file mode 100644
index 000000000..bb0fd6dd3
--- /dev/null
+++ b/.github/bump_version.py
@@ -0,0 +1,79 @@
+"""Infer semver bump from towncrier fragment types and update version."""
+
+import re
+import sys
+from pathlib import Path
+
+
+def get_current_version(pyproject_path: Path) -> str:
+    text = pyproject_path.read_text()
+    match = re.search(r'^version\s*=\s*"(\d+\.\d+\.\d+)"', text, re.MULTILINE)
+    if not match:
+        print(
+            "Could not find version in pyproject.toml",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+    return match.group(1)
+
+
+def infer_bump(changelog_dir: Path) -> str:
+    fragments = [
+        f
+        for f in changelog_dir.iterdir()
+        if f.is_file() and f.name != ".gitkeep"
+    ]
+    if not fragments:
+        print("No changelog fragments found", file=sys.stderr)
+        sys.exit(1)
+
+    categories = {f.suffix.lstrip(".") for f in fragments}
+    for f in fragments:
+        parts = f.stem.split(".")
+        if len(parts) >= 2:
+            categories.add(parts[-1])
+
+    if "breaking" in categories:
+        return "major"
+    if "added" in categories or "removed" in categories:
+        return "minor"
+    return "patch"
+
+
+def bump_version(version: str, bump: str) -> str:
+    major, minor, patch = (int(x) for x in version.split("."))
+    if bump == "major":
+        return f"{major + 1}.0.0"
+    elif bump == "minor":
+        return f"{major}.{minor + 1}.0"
+    else:
+        return f"{major}.{minor}.{patch + 1}"
+
+
+def update_file(path: Path, old_version: str, new_version: str):
+    text = path.read_text()
+    updated = text.replace(
+        f'version = "{old_version}"',
+        f'version = "{new_version}"',
+    )
+    if updated != text:
+        path.write_text(updated)
+        print(f"  Updated {path}")
+
+
+def main():
+    root = Path(__file__).resolve().parent.parent
+    pyproject = root / "pyproject.toml"
+    changelog_dir = root / "changelog.d"
+
+    current = get_current_version(pyproject)
+    bump = infer_bump(changelog_dir)
+    new = bump_version(current, bump)
+
+    print(f"Version: {current} -> {new} ({bump})")
+
+    update_file(pyproject, current, new)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/CLAUDE.md b/CLAUDE.md
index 4b565ec0e..7613d2ae2 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -21,7 +21,7 @@
 - **Testing**: Write tests for all new functionality
 - **Documentation**: Document all public functions with docstrings
 - **Versioning**: Follow SemVer (increment patch for fixes, minor for features, major for breaking changes)
-- **Pull Requests**: Must include a changelog_entry.yaml file describing the changes (GitHub Actions will automatically run `make changelog` to update the changelog)
+- **Pull Requests**: Must include a changelog.d/ file describing the changes (GitHub Actions will automatically run `make changelog` to update the changelog)
 
 ## Repository Structure
 - **parameters/**: YAML files that define tax rates, thresholds, and other policy parameters
diff --git a/Makefile b/Makefile
index 1b8392194..3579f7b39 100644
--- a/Makefile
+++ b/Makefile
@@ -35,8 +35,5 @@ documentation:
 docs: documentation
 
 changelog:
-	build-changelog changelog.yaml --output changelog.yaml --update-last-date --start-from 0.1.0 --append-file changelog_entry.yaml
-	build-changelog changelog.yaml --org PolicyEngine --repo openfisca-uk --output CHANGELOG.md --template .github/changelog_template.md
-	bump-version changelog.yaml pyproject.toml
-	rm changelog_entry.yaml || true
-	touch changelog_entry.yaml
+	python .github/bump_version.py
+	towncrier build --yes --version $$(python -c "import re; print(re.search(r'version = \"(.+?)\"', open('pyproject.toml').read()).group(1))")
\ No newline at end of file
diff --git a/changelog_entry.yaml b/changelog.d/.gitkeep
similarity index 100%
rename from changelog_entry.yaml
rename to changelog.d/.gitkeep
diff --git a/changelog.d/migrate-to-towncrier.changed.md b/changelog.d/migrate-to-towncrier.changed.md
new file mode 100644
index 000000000..865484add
--- /dev/null
+++ b/changelog.d/migrate-to-towncrier.changed.md
@@ -0,0 +1 @@
+Migrated from changelog_entry.yaml to towncrier fragments to eliminate merge conflicts.
diff --git a/changelog.yaml b/changelog.yaml
deleted file mode 100644
index 514cfd8f7..000000000
--- a/changelog.yaml
+++ /dev/null
@@ -1,2297 +0,0 @@
-- changes:
-    added:
-    - Income Tax and National Insurance.
-    - All benefits are at least taken from survey reporting (can be switched on-off).
-    - Child Benefit is modelled, others such as Income Support, JSA (both types),
-      Tax Credits can be simulated/reformed but require more reviewing in how to account
-      for discrepancies caused by take-up rates.
-    - Four budget-neutral UBI reforms are implemented.
-    - 15 test cases (unit and integration) testing benefits and taxes.
-    - Simulation helper tools.
-  date: 2020-11-08 00:00:00
-  version: 0.1.0
-- bump: minor
-  changes:
-    changed:
-    - Time periods now appropriate, using an implementation of WEEK for most benefits.
-    - MTRs handled properly and include a breakdown.
-    - Simulation tools are improved and included in a class.
-  date: 2020-12-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Improved documentation of parameters.
-    - Tests now occur in 2021 to ensure FY20-21 parameters are used.
-    fixed:
-    - Bug in CB-HITC that caused overestimation.
-  date: 2021-04-19 00:00:00
-- bump: patch
-  changes:
-    added:
-    - Jupyter-Book documentation.
-    - More detailed disability variables.
-    fixed:
-    - IndividualSim reform handling.
-  date: 2021-04-20 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - MicroDataFrame and MicroSeries returned by default.
-    fixed:
-    - Bugs.
-  date: 2021-04-21 00:00:00
-- bump: minor
-  changes:
-    added:
-    - New interface for microsimulation.
-    - Sources in tax logic.
-    - Tests.
-    changed:
-    - Microdata now generated and loaded in-model.
-    - Variable time periods made more consistent.
-    - Derivative calculations made more efficient and have more options.
-  date: 2021-07-04 00:00:00
-- bump: minor
-  changes:
-    added:
-    - Tests for variable naming conventions.
-    - Postcode lookup optional features available.
-    - LHA rates for all BRMA areas added.
-    changed:
-    - PolicyEngine-UK now runs from the official OpenFisca-Core.
-  date: 2021-07-05 00:00:00
-- bump: minor
-  changes:
-    changed:
-    - Minor update
-  date: 2021-07-05 00:00:00
-- bump: minor
-  changes:
-    changed:
-    - Minor update
-  date: 2021-07-05 00:00:00
-- bump: minor
-  changes:
-    changed:
-    - Minor update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Patch update
-  date: 2021-07-05 00:00:00
-- bump: patch
-  changes:
-    added:
-    - Units for some variables.
-    changed:
-    - Code refactoring.
-  date: 2021-12-23 00:00:00
-- bump: minor
-  changes:
-    added:
-    - Historical Working Tax Credit parameters since 2002 (previously since 2016).
-    - Legislative references for Working Tax Credit parameters.
-    changed:
-    - Working Tax Credit child care parameters represent the maximum amount, prior
-      to the share covered.
-    fixed:
-    - Apply Working Tax Credit old-age provision to 60-year-olds.
-    - Qualify people working 30 hours for the Working Tax Credit.
-    - Point afcs to afcs_reported instead of AA_reported.
-    - Fix units on some variables.
-  date: 2021-12-27 00:00:00
-- bump: patch
-  changes:
-    removed:
-    - Benefit unit- and household-level saved random numbers for take-up.
-  date: 2021-12-29 00:00:00
-- bump: minor
-  changes:
-    added:
-    - Minimum tax credit benefit amount.
-  date: 2021-12-29 00:00:01
-- bump: patch
-  changes:
-    added:
-    - Microsimulation tests and YAML data for Child Benefit, Tax Credits and Council
-      Tax.
-    - Documentation page for Tax Credits.
-    - Simplified dataset usage to enhanced FRS only.
-  date: 2021-12-29 00:00:02
-- bump: patch
-  changes:
-    added:
-    - Metadata for the Dividend, Property and Trading Allowances.
-  date: 2022-01-07 00:00:00
-- bump: minor
-  changes:
-    added:
-    - Parameter representing the Child Tax Credit's child limit.
-    changed:
-    - Renamed parameter representing Universal Credit's child limit.
-  date: 2022-01-07 00:00:01
-- bump: patch
-  changes:
-    changed:
-    - Label metadata for tax variables.
-  date: 2022-01-08 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Removes the `u` prefix from all variable label strings.
-  date: 2022-01-08 00:00:01
-- bump: patch
-  changes:
-    added:
-    - Sure Start Maternity Grant (reported).
-    changed:
-    - Education benefits summed in a formula.
-    fixed:
-    - Some maternity benefits (SSMG, SMP) and WFA not included in benefits.
-  date: 2022-01-12 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - PolicyEngine-UK-Data version increased to 0.7.0.
-  date: 2022-01-14 00:00:00
-- bump: patch
-  changes:
-    added:
-    - When datasets are not available, a prompt is displayed to download them or use
-      synthetic data.
-    - CLI interface trigger changed from `openfisca-uk-setup` to `openfisca-uk` and
-      default years updated.
-  date: 2022-01-16 00:00:00
-- bump: patch
-  changes:
-    added:
-    - Stocks/flows metadata for PolicyEngine-facing variables.
-  date: 2022-01-17 00:00:00
-- bump: patch
-  changes:
-    fixed:
-    - Household gross income calculated directly from household benefits and market
-      income.
-    - Savings allowance was previously set to zero erroneously for households in Scotland
-      at the starter or intermediate bands.
-  date: 2022-01-17 00:00:01
-- bump: patch
-  changes:
-    added:
-    - Metadata (period, unit, name, label) for all Universal Credit parameters.
-  date: 2022-01-18 00:00:00
-- bump: patch
-  changes:
-    fixed:
-    - Baseline HBAI-excluded income variable now uses the Synthetic FRS when the enhanced
-      FRS is not available.
-  date: 2022-01-22 00:00:00
-- bump: patch
-  changes:
-    added:
-    - Unit test for benefit unit rent.
-    changed:
-    - OpenFisca-Tools dependency patch increased.
-  date: 2022-01-22 00:00:01
-- bump: minor
-  changes:
-    added:
-    - Re-weighting routine for the Family Resources Survey, matching aggregates, participation
-      and populations.
-  date: 2022-02-04 00:00:00
-- bump: minor
-  changes:
-    added:
-    - The Energy Bills Rebate scheme.
-  date: 2022-02-06 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - OpenFisca-Tools bumped to v0.3
-  date: 2022-02-14 00:00:00
-- bump: patch
-  changes:
-    added:
-    - Basic income parameters and logic.
-  date: 2022-02-14 00:00:01
-- bump: patch
-  changes:
-    changed:
-    - Set basic income phaseout threshold default to 0.
-  date: 2022-02-14 00:00:02
-- bump: patch
-  changes:
-    added:
-    - Historical carbon emissions parameter.
-  date: 2022-02-25 00:00:00
-- bump: minor
-  changes:
-    added:
-    - Pensioner exemption switch for Income Tax rate and threshold reforms.
-  date: 2022-02-28 00:00:00
-- bump: minor
-  changes:
-    changed:
-    - Re-weighting procedure formalised with cross-validation and logging.
-  date: 2022-02-28 00:00:01
-- bump: patch
-  changes:
-    added:
-    - Added a production-based carbon emissions parameter.
-  date: 2022-03-04 00:00:00
-- bump: patch
-  changes:
-    changed:
-    - Re-weighting procedure improved with consolidated categories and added income
-      source targeting.
-  date: 2022-03-04 00:00:01
-- bump: patch
-  changes:
-    fixed:
-    - Basic income means-test inclusion previously didn't work correctly (when turned
-      off) for Housing Benefit and Pension Credit.
-  date: 2022-03-08 00:00:00
-- bump: patch
-  changes: {}
-  date: 2022-03-08 00:00:01
-- bump: minor
-  changes:
-    added:
-    - 'Forecasting to 2027: new and improved household weights.'
-  date: 2022-03-23 00:00:00
-- bump: minor
-  changes:
-    added:
-    - 'Forecasting to 2027: new and improved household weights.'
-  date: 2022-03-24 00:22:00
-- bump: patch
-  changes:
-    fixed:
-    - Pull request merge action didn't correctly update the repo.
-  date: 2022-03-24 03:05:39
-- bump: patch
-  changes:
-    fixed:
-    - Bugs related to uprating parameters.
-  date: 2022-03-24 03:05:39
-- bump: minor
-  changes:
-    added:
-    - Tax and benefit changes announced in the 2022 Spring Statement.
-    - Inflation and real disposable income.
-    - Parameters for PIP, DLA, SDA, AA and Carer's Allowance.
-    changed:
-    - Added calibration make.
-  date: 2022-03-27 14:13:20
-- bump: minor
-  changes:
-    fixed:
-    - Synthetic FRS now successfully loads.
-    - Incorporates better calibration and imputations.
-  date: 2022-04-03 19:28:24
-- bump: minor
-  changes:
-    added:
-    - Total wealth variable.
-  date: 2022-04-05 09:41:35
-- bump: patch
-  changes:
-    fixed:
-    - Spring Statement Class 4 NI change correctly follows 2022/23 adjustment.
-  date: 2022-04-05 12:28:40
-- bump: patch
-  changes:
-    added:
-    - Carbon tax model page added.
-  date: 2022-04-05 14:23:50
-- bump: patch
-  changes:
-    fixed:
-    - A bug preventing the Synthetic FRS from loading.
-  date: 2022-04-07 09:51:58
-- bump: patch
-  changes:
-    added:
-    - Carbon emissions (production-based) by industry.
-  date: 2022-04-07 10:36:03
-- bump: patch
-  changes:
-    fixed:
-    - Chart on carbon intensities.
-  date: 2022-04-08 10:35:59
-- bump: minor
-  changes:
-    added:
-    - Dataset generation.
-  date: 2022-04-14 11:46:45
-- bump: patch
-  changes:
-    fixed:
-    - Failed import of policyengine_uk.tools
-  date: 2022-04-14 12:36:43
-- bump: patch
-  changes:
-    fixed:
-    - Failed imports of reform tools.
-  date: 2022-04-14 12:48:06
-- bump: patch
-  changes:
-    fixed:
-    - MANIFEST.in file re-added (caused previous two issues).
-  date: 2022-04-14 13:10:26
-- bump: patch
-  changes:
-    fixed:
-    - Land and carbon are calculated based off UK-wide statistics, not in-model statistics.
-  date: 2022-04-22 21:26:10
-- bump: minor
-  changes:
-    changed:
-    - Pension Credit code quality improvements.
-    fixed:
-    - Pension Credit missing disability elements.
-  date: 2022-04-26 12:10:51
-- bump: minor
-  changes:
-    changed:
-    - Calibration process improved with country-level targets.
-  date: 2022-04-29 09:29:26
-- bump: minor
-  changes:
-    added:
-    - Household-level phase-outs for basic income.
-  date: 2022-05-16 14:02:26
-- bump: patch
-  changes:
-    fixed:
-    - National Insurance thresholds pre-July, post-Spring Statement (inflation adjustments).
-  date: 2022-05-19 14:58:06
-- bump: patch
-  changes:
-    changed:
-    - Reorganize documentation and variables.
-  date: 2022-05-21 16:01:32
-- bump: patch
-  changes:
-    fixed:
-    - Baseline variables are now generated before calibration (fixes a bug causing
-      overestimation of benefit caseloads).
-  date: 2022-05-22 15:27:50
-- bump: minor
-  changes:
-    added:
-    - Miscellaneous benefit payment.
-  date: 2022-05-26 10:46:43
-- bump: minor
-  changes:
-    added:
-    - UK Government cost-of-living support measures.
-  date: 2022-05-26 13:04:11
-- bump: minor
-  changes:
-    added:
-    - Disability benefits to COL support measures.
-  date: 2022-05-26 16:16:50
-- bump: patch
-  changes:
-    added:
-    - References for some tax and UC parameters.
-  date: 2022-06-05 20:28:29
-- bump: minor
-  changes:
-    added:
-    - Dashboard tool for the calibration procedure.
-    - Loss components for aggregates in demographic targets.
-    fixed:
-    - A bug causing Pension Credit to under-react to increases in Income Tax.
-  date: 2022-07-25 11:14:58
-- bump: minor
-  changes:
-    added:
-    - TV licence fee.
-  date: 2022-07-27 10:14:59
-- bump: patch
-  changes:
-    fixed:
-    - Round marriage allowance.
-  date: 2022-08-25 17:36:23
-- bump: minor
-  changes:
-  - Refactored the parameter tree into the (gov/hh/calibration/contrib)|(dept) format.
-  date: 2022-08-28 14:45:36
-- bump: minor
-  changes:
-    added:
-    - Ofgem energy price cap subsidy parameters.
-  date: 2022-09-07 12:15:01
-- bump: patch
-  changes:
-    added:
-    - New monthly CPI values until July.
-  date: 2022-09-11 15:04:15
-- bump: minor
-  changes:
-    added:
-    - Energy Price Guarantee parametric reform.
-  date: 2022-09-14 19:32:06
-- bump: patch
-  changes:
-    fixed:
-    - Validation page.
-  date: 2022-09-15 13:40:02
-- bump: minor
-  changes:
-    added:
-    - Wealth tax.
-  date: 2022-09-17 16:24:23
-- bump: minor
-  changes:
-    added:
-    - Metadata for SDLT, LTT and LBTT parameters.
-  date: 2022-09-21 11:06:49
-- bump: minor
-  changes:
-    added:
-    - Flat basic income amount.
-  date: 2022-09-27 15:37:07
-- bump: patch
-  changes:
-    fixed:
-    - UC amount for single, under-25s after the last uprating.
-  date: 2022-10-04 11:02:45
-- bump: minor
-  changes:
-    changed:
-    - Moved to PolicyEngine Core.
-  date: 2022-10-22 18:22:07
-- bump: minor
-  changes:
-    changed:
-    - Roles to 'member'.
-  date: 2022-12-06 12:00:54
-- bump: patch
-  changes:
-    fixed:
-    - PolicyEngine-Core pinned to a minor version.
-  date: 2022-12-07 13:31:54
-- bump: patch
-  changes:
-    fixed:
-    - Incorporated Core fix.
-  date: 2022-12-07 13:50:34
-- bump: minor
-  changes:
-    added:
-    - LVT
-    - Carbon tax
-    - NI BRMAs
-    - NI domestic rates by local authority
-  date: 2022-12-11 18:29:22
-- bump: patch
-  changes:
-    added:
-    - Metadata for contrib parameters.
-  date: 2022-12-13 20:20:48
-- bump: patch
-  changes:
-    added:
-    - Metadata for PolicyEngine.
-  date: 2022-12-14 16:33:27
-- bump: patch
-  changes:
-    changed:
-    - Bumped PolicyEngine-Core.
-  date: 2022-12-15 16:10:43
-- bump: patch
-  changes:
-    added:
-    - Variable metadata for disability variables.
-    - Auto-update for the API.
-  date: 2022-12-20 10:59:01
-- bump: patch
-  changes:
-    added:
-    - ENV token for the deployment action.
-  date: 2022-12-20 11:41:05
-- bump: patch
-  changes:
-    added:
-    - Token for GitHub PR filing (deployment of the API).
-  date: 2022-12-20 14:11:35
-- bump: minor
-  changes:
-    added:
-    - Normalised poverty and deep poverty variables.
-  date: 2022-12-27 13:53:34
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing UC housing entitlements to be too low for single people with children.
-  date: 2022-12-28 17:28:42
-- bump: patch
-  changes:
-    changed:
-    - Reorganised variables in the input tree.
-  date: 2022-12-30 17:05:40
-- bump: patch
-  changes:
-    added:
-    - Missing label in inputs.
-  date: 2023-01-03 20:32:56
-- bump: patch
-  changes:
-    changed:
-    - PolicyEngine Core version widened.
-  date: 2023-01-03 23:39:07
-- bump: patch
-  changes:
-    added:
-    - Metadata on modelled policies.
-  date: 2023-01-06 10:07:28
-- bump: patch
-  changes:
-    changed:
-    - Use `adds` and `subtracts` everywhere.
-    - Replace `aggr` with `add`.
-    - Apply `defined_for`.
-    - Use `default` arg to `select` rather than dummy `True` condition.
-  date: 2023-01-10 17:31:54
-- bump: minor
-  changes:
-    added:
-    - Monthly NI calculations.
-  date: 2023-01-19 22:59:56
-- bump: minor
-  changes:
-    added:
-    - VAT imputation and implementation.
-  date: 2023-01-25 21:14:21
-- bump: minor
-  changes:
-    added:
-    - Wealth tax brackets.
-    - Intermediate benefit uprating (multiplies by a percentage).
-  date: 2023-01-26 20:09:59
-- bump: patch
-  changes:
-    changed:
-    - MTR calculation limited to one person for speed improvement.
-    - Benefit cap implementation refactored to share code between UC and HB.
-    fixed:
-    - Property income reduces UC as unearned income.
-  date: 2023-01-27 09:21:35
-- bump: patch
-  changes:
-    changed:
-    - VAT adjusted to hit administrative targets.
-  date: 2023-01-27 13:02:28
-- bump: patch
-  changes:
-    changed:
-    - Raised default age from 18 to 30.
-  date: 2023-02-01 00:43:08
-- bump: patch
-  changes:
-    changed:
-    - Increased default age from 30 to 40.
-  date: 2023-02-01 03:38:40
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing pension contributions to not be correctly deducted from taxable
-      income.
-  date: 2023-02-27 13:23:51
-- bump: patch
-  changes:
-    fixed:
-    - Energy Price Guarantee implementation.
-  date: 2023-02-27 15:06:37
-- bump: patch
-  changes:
-    added:
-    - Seasonality to EPG modelling (simple).
-    - EPG documentation updates.
-  date: 2023-02-27 15:37:16
-- bump: patch
-  changes:
-    fixed:
-    - Properly exclude primary residence values from the CEC wealth tax.
-  date: 2023-02-27 16:01:50
-- bump: patch
-  changes:
-    fixed:
-    - EPG properly included in net income.
-  date: 2023-02-27 16:53:13
-- bump: patch
-  changes:
-    fixed:
-    - EPG test used the wrong variable name.
-  date: 2023-02-27 17:19:33
-- bump: patch
-  changes:
-    fixed:
-    - Parameter updates for the CoL payments.
-    - Metadata for the CEC wealth tax.
-  date: 2023-03-02 11:57:32
-- bump: minor
-  changes:
-    added:
-    - State Pension uprating parameter.
-    fixed:
-    - Corporate wealth for pensioners capped to ensure consistency with pension income
-      in some cases.
-    - EBC end date is before 2023.
-  date: 2023-03-03 16:23:13
-- bump: patch
-  changes:
-    fixed:
-    - Bugs relating to private pension contributions.
-  date: 2023-03-14 18:22:37
-- bump: minor
-  changes:
-    changed:
-    - Fuel duty incidence assumed to be 100% on consumers.
-  date: 2023-03-15 11:40:17
-- bump: minor
-  changes:
-    changed:
-    - PolicyEngine Core data updates accounted for.
-  date: 2023-03-23 08:45:05
-- bump: patch
-  changes:
-    fixed:
-    - Made Survey-Enhance a dev dependency.
-  date: 2023-03-25 23:53:14
-- bump: patch
-  changes:
-    fixed:
-    - Import errors due to survey-enhance.
-  date: 2023-03-26 00:21:18
-- bump: patch
-  changes:
-    fixed:
-    - Marriage Allowance previously didn't have an economic impact.
-  date: 2023-03-30 14:03:15
-- bump: minor
-  changes:
-    added:
-    - Improvements to calibration routines.
-  date: 2023-04-01 09:38:48
-- bump: patch
-  changes:
-    added:
-    - Speed improvements
-    - Parameter metadata fixes
-  date: 2023-04-10 13:36:29
-- bump: minor
-  changes:
-    added:
-    - Extra tax bands for the UK and Scotland.
-  date: 2023-04-24 12:16:00
-- bump: minor
-  changes:
-    added:
-    - Spring Budget 2023 policy changes.
-  date: 2023-04-24 14:03:45
-- bump: minor
-  changes:
-    added:
-    - 2023 tax rates for UK and Scotland
-  date: 2023-04-24 14:04:39
-- bump: minor
-  changes:
-    added:
-    - Savings variable from the WAS.
-    fixed:
-    - Added logging for targets in imputations for completeness.
-  date: 2023-05-09 17:02:36
-- bump: patch
-  changes:
-    added:
-    - Missing labels for parameters.
-  date: 2023-05-23 12:04:57
-- bump: minor
-  changes:
-    added:
-    - Python 3.10 support.
-  date: 2023-05-27 15:52:33
-- bump: patch
-  changes:
-    fixed:
-    - Household basic income phase-out rate unit.
-  date: 2023-05-28 02:23:58
-- bump: minor
-  changes:
-    added:
-    - Marriage tax-related reforms.
-  date: 2023-06-18 09:17:08
-- bump: patch
-  changes:
-    fixed:
-    - A bug in the income-splitting logic that caused taxable incomes to be too low.
-  date: 2023-06-20 19:19:13
-- bump: minor
-  changes:
-    added:
-    - Updates to calibration statistics from 2023 benefits and tax sources.
-  date: 2023-07-09 19:21:46
-- bump: minor
-  changes:
-    fixed:
-    - Bug affecting the two-child limit (1% of households)
-  date: 2023-07-17 17:10:23
-- bump: minor
-  changes:
-    changed:
-    - Calibration updated with new DWP statistics.
-  date: 2023-07-21 12:20:43
-- bump: minor
-  changes:
-    added:
-    - Updates values for universal credit from 2016 to 2023
-  date: 2023-08-07 16:52:20
-- bump: patch
-  changes:
-    fixed:
-    - Temporarily remove PIP, DLA and minimum wage parameters from the app.
-  date: 2023-08-12 17:36:09
-- bump: patch
-  changes:
-    added:
-    - Documentation for fuel duty.
-  date: 2023-08-24 14:59:45
-- bump: patch
-  changes:
-    added:
-    - Documentation example.
-  date: 2023-09-14 13:53:16
-- bump: patch
-  changes:
-    fixed:
-    - TOC entry for NI documentation.
-  date: 2023-09-14 15:25:24
-- bump: minor
-  changes:
-    added:
-    - Update Universal Credit documentation
-  date: 2023-09-14 15:31:01
-- bump: patch
-  changes:
-    added:
-    - Documentation for TV licence.
-  date: 2023-09-14 15:35:12
-- bump: patch
-  changes:
-    fixed:
-    - Small issues on the NI page.
-  date: 2023-09-14 16:06:31
-- bump: patch
-  changes:
-    removed:
-    - numpy pin.
-  date: 2023-10-09 19:01:07
-- bump: patch
-  changes:
-    added:
-    - Documentation for Stamp Duty Land Tax.
-  date: 2023-10-12 15:11:13
-- bump: minor
-  changes:
-    added:
-    - Child minimum age for basic income.
-  date: 2023-10-17 14:55:07
-- bump: minor
-  changes:
-    added:
-    - Pension Credit documentation page.
-  date: 2023-10-19 15:46:33
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing child minimum basic income ages to function incorrectly when the
-      adult UBI is nonzero.
-  date: 2023-10-27 20:42:43
-- bump: patch
-  changes:
-    added:
-    - Documentation for Land and Buildings Transaction Tax.
-    - Documentation for Land Transaction Tax.
-    fixed:
-    - Updated LBTT rate increase for non-primary residences.
-    - Fixed SDLT description.
-  date: 2023-11-16 16:32:22
-- bump: minor
-  changes:
-    added:
-    - Switch for benefit uprating.
-  date: 2023-11-22 12:04:13
-- bump: minor
-  changes:
-    added:
-    - HM Treasury baseline for CPI uprating benefits.
-  date: 2023-11-22 15:17:21
-- bump: minor
-  changes:
-    added:
-    - Update National Insurance documentation
-    - Update Income Tax documentation
-  date: 2023-11-23 16:22:19
-- bump: patch
-  changes:
-    removed:
-    - 19% basic rate change proposed for 2024 that was never enacted.
-  date: 2023-11-23 18:03:37
-- bump: patch
-  changes:
-    fixed:
-    - Added missing label for benefit uprating.
-  date: 2023-11-24 10:49:06
-- bump: patch
-  changes:
-    fixed:
-    - Added missing label for benefit uprating.
-  date: 2023-11-26 14:29:46
-- bump: minor
-  changes:
-    added:
-    - Enhanced FRS version for December 2023.
-  date: 2023-12-05 12:45:18
-- bump: patch
-  changes:
-    added:
-    - Test cases for TV Licence.
-  date: 2023-12-14 16:07:36
-- bump: patch
-  changes:
-    added:
-    - Missing uprating parameters for 2018.
-  date: 2023-12-15 14:32:51
-- bump: minor
-  changes:
-    changed:
-    - Validated and standardised National Insurance variables.
-  date: 2023-12-15 14:54:47
-- bump: patch
-  changes:
-    fixed:
-    - Bump policyengine-core to capture simulation randomness bug fixes.
-  date: 2023-12-17 10:18:46
-- bump: patch
-  changes:
-    added:
-    - Added tests for fuel duty.
-  date: 2024-01-04 16:08:24
-- bump: minor
-  changes:
-    added:
-    - Update PIP documentation
-  date: 2024-01-04 16:18:59
-- bump: minor
-  changes:
-    changed:
-    - Calibration routine to include benefit cap statistics.
-    fixed:
-    - Benefit cap UC bug.
-  date: 2024-01-28 17:39:54
-- bump: minor
-  changes:
-    added:
-    - Add Income Tax test.
-  date: 2024-02-01 16:02:50
-- bump: minor
-  changes:
-    added:
-    - Household wealth decile.
-    changed:
-    - Assign decile of -1 to households with negative income.
-  date: 2024-02-17 21:35:30
-- bump: minor
-  changes:
-    added:
-    - Initial version of capital gains imputations and logic.
-  date: 2024-02-19 22:00:58
-- bump: minor
-  changes:
-    added:
-    - Docker image deployment for streamlit documentation.
-  date: 2024-02-19 22:26:55
-- bump: patch
-  changes:
-    changed:
-    - Lowered rates for Class 1 and Class 4 NICs, pursuant to the Autumn Statement
-      2023
-    - Set Class 2 NIC rate to 0%, pursuant to the Autumn Statement 2023
-  date: 2024-03-04 18:45:44
-- bump: minor
-  changes:
-    fixed:
-    - Carbon tax intensities for 2024.
-    - UK NI rate for 2024.
-  date: 2024-03-05 11:48:27
-- bump: minor
-  changes:
-    added:
-    - Fuel duty revenue projections
-  date: 2024-03-05 17:37:39
-- bump: minor
-  changes:
-    added:
-    - add Income Tax Integration Test
-  date: 2024-03-07 16:04:57
-- bump: minor
-  changes:
-    changed:
-    - OBR forecast update.
-  date: 2024-04-12 17:36:36
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing frs_2021 simulations to error.
-    - Unnecessary system initialisation code.
-  date: 2024-04-16 13:18:46
-- bump: minor
-  changes:
-    fixed:
-    - Capital gains tax improvements.
-  date: 2024-04-30 17:53:26
-- bump: patch
-  changes:
-    fixed:
-    - Update BRMAs.
-  date: 2024-04-30 18:10:23
-- bump: minor
-  changes:
-    added:
-    - State Pension Age reforms.
-  date: 2024-05-01 16:32:07
-- bump: minor
-  changes:
-    added:
-    - U.S. progress on labour supply responses.
-  date: 2024-05-02 11:47:45
-- bump: minor
-  changes:
-    added:
-    - Abolition switch for State Pension payments.
-    - Freeze switch for Pension Credit payments.
-    fixed:
-    - New benefit claimants are now accounted for in reforms.
-  date: 2024-05-23 17:20:21
-- bump: minor
-  changes:
-    added:
-    - Pensioner personal allowance
-  date: 2024-05-27 22:27:48
-- bump: minor
-  changes:
-    added:
-    - Improvements to State Pension handling.
-    - Basic/additional State Pension splitting.
-  date: 2024-05-28 11:46:47
-- bump: minor
-  changes:
-    added:
-    - Recent reforms to Income Tax and NI.
-  date: 2024-06-07 08:22:24
-- bump: minor
-  changes:
-    added:
-    - Conservative manifesto policy to move CB HITC to household based.
-  date: 2024-06-10 12:42:45
-- bump: minor
-  changes:
-    added:
-    - Budgetary change distributional impact parameters.
-  date: 2024-06-11 07:51:23
-- bump: minor
-  changes:
-    fixed:
-    - Property sale rates at 4.5%.
-  date: 2024-06-11 15:49:29
-- bump: patch
-  changes:
-    changed:
-    - Uprated PIP, DLA, and Accessibility Account
-    - Re-enabled PIP and DLA within webapp
-    - Corrected mistakes in PIP
-  date: 2024-06-17 16:09:43
-- bump: patch
-  changes:
-    added:
-    - Private school VAT calculation
-  date: 2024-06-28 00:49:27
-- bump: minor
-  changes:
-    added:
-    - Non-dom status switch.
-  date: 2024-06-28 16:35:47
-- bump: minor
-  changes:
-    added:
-    - High-income budget switch.
-    removed:
-    - Non-dom logic.
-  date: 2024-06-28 19:59:31
-- bump: minor
-  changes:
-    added:
-    - 2022-23 FRS.
-  date: 2024-07-10 18:29:49
-- bump: patch
-  changes:
-    added:
-    - Tests to income-related variables
-  date: 2024-07-10 18:58:10
-- bump: patch
-  changes:
-    added:
-    - Auto-updating of the household API when this package is updated
-  date: 2024-07-10 20:08:36
-- bump: patch
-  changes:
-    changed:
-    - Refactor the Universal Credit parameter, variable and test files.
-  date: 2024-07-11 14:58:53
-- bump: patch
-  changes:
-    changed:
-    - Refactor the Housing Benefit parameter, variable and test files.
-  date: 2024-07-15 12:12:25
-- bump: patch
-  changes:
-    added:
-    - References to many income tax provisions.
-    fixed:
-    - Folder distribution and formatting for income tax-related variables.
-    - pays_scottish_income_tax now returns a Boolean value.
-  date: 2024-07-17 15:26:43
-- bump: patch
-  changes:
-    fixed:
-    - Ensure household API version script bumps UK version
-  date: 2024-07-17 16:23:18
-- bump: major
-  changes:
-    changed:
-    - Fiscal years are years by default.
-  date: 2024-07-19 09:43:03
-- bump: minor
-  changes:
-    changed:
-    - Simplified uprating indices by moving OBR parameters to gov folder.
-  date: 2024-07-26 08:35:13
-- bump: minor
-  changes:
-    added:
-    - Tax on excess pension contributions
-    fixed:
-    - Include Scottish income tax calculation within overall UK income tax calculation
-    - Apply allowances to all types of income
-    - Prevent negative income tax output
-    - Update Dividend Allowance values
-    - Correct Starter Rate for Savings taper structure
-    - Prevent calculation errors due to empty extra dividend bracket with conflicting
-      rates
-  date: 2024-07-27 10:02:38
-- bump: minor
-  changes:
-    added:
-    - Winter Fuel Allowance.
-  date: 2024-07-29 16:47:34
-- bump: minor
-  changes:
-    added:
-    - Winter Fuel Payment to household benefits.
-  date: 2024-07-30 13:05:05
-- bump: minor
-  changes:
-    added:
-    - Docs page about SPI 2020/21 validation
-    fixed:
-    - Correct Scottish income tax rates for 2020/21
-  date: 2024-08-08 15:33:05
-- bump: patch
-  changes:
-    changed:
-    - Corrected spelling on SPI validation documentation entry
-    - Corrected argparse version
-  date: 2024-08-12 22:11:31
-- bump: minor
-  changes:
-    fixed:
-    - Updated inflation uprating for COICOP categories.
-  date: 2024-08-15 11:09:56
-- bump: minor
-  changes:
-    added:
-    - CPI category forecasts.
-  date: 2024-08-15 11:36:14
-- bump: patch
-  changes:
-    added:
-    - Mask applied to private_school_vat to prevent calculation error when household
-      weights aren't provided
-  date: 2024-08-22 20:35:09
-- bump: patch
-  changes:
-    added:
-    - Test suite for private_school_vat
-    - Test suite for attends_private_school
-    removed:
-    - Unnecessary print statement in winter_fuel_allowance
-  date: 2024-08-28 23:37:22
-- bump: patch
-  changes:
-    changed:
-    - Update policyengine-core.
-    - Apply new approach to determine if in a microsimulation.
-  date: 2024-09-03 22:35:35
-- bump: patch
-  changes:
-    fixed:
-    - Ensure rent index is tracking CPI.
-  date: 2024-09-16 09:32:28
-- bump: minor
-  changes:
-    fixed:
-    - Missing metadata in variables.
-    - Inflation uprating for some parameters.
-    - Inconsistent variable capitalisation.
-  date: 2024-09-16 11:41:10
-- bump: major
-  changes:
-    changed:
-    - Dataset handling outsourced to policyengine-uk-data.
-  date: 2024-09-18 10:53:42
-- bump: minor
-  changes:
-    fixed:
-    - Add back recursive-include.
-  date: 2024-09-18 11:04:12
-- bump: patch
-  changes:
-    removed:
-    - Survey-Enhance as a dependency.
-  date: 2024-09-18 11:12:23
-- bump: minor
-  changes:
-    fixed:
-    - Add employer NI incidence.
-  date: 2024-10-16 11:52:07
-- bump: minor
-  changes:
-    changed:
-    - UK-data bumped to 1.5.
-  date: 2024-10-17 10:47:06
-- bump: minor
-  changes:
-    added:
-    - Employee incidence percentage for employer NICs.
-  date: 2024-10-17 21:43:42
-- bump: minor
-  changes:
-    changed:
-    - UK data package bumped to 1.6.
-  date: 2024-10-19 09:27:21
-- bump: minor
-  changes:
-    fixed:
-    - Bug in budget change reforms.
-  date: 2024-10-19 19:58:09
-- bump: minor
-  changes:
-    added:
-    - Automatic allocation of post-employee-incidence employee to households (consumers/capital).
-  date: 2024-10-21 10:09:01
-- bump: minor
-  changes:
-    fixed:
-    - Adjusted private school attendance factor to 0.85.
-  date: 2024-10-21 13:04:20
-- bump: minor
-  changes:
-    changed:
-    - UK data updated to 1.8.0.
-  date: 2024-10-22 08:36:24
-- bump: minor
-  changes:
-    changed:
-    - Data bumped to 1.9.0.
-  date: 2024-10-22 11:24:42
-- bump: minor
-  changes:
-    added:
-    - Benefit uprating for 2025/26.
-  date: 2024-10-23 10:15:26
-- bump: minor
-  changes:
-    added:
-    - Capital Gains Tax elasticities.
-  date: 2024-10-23 14:47:21
-- bump: minor
-  changes:
-    fixed:
-    - Bug causing household app crashes.
-    - Metadat for OBR parameters.
-  date: 2024-10-24 11:42:25
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing capital gains responses to be calculated for every reform simulation.
-  date: 2024-10-24 13:24:27
-- bump: patch
-  changes:
-    fixed:
-    - Threshold freeze for ST extended to 2027.
-  date: 2024-10-28 10:46:29
-- bump: minor
-  changes:
-    fixed:
-    - Bugs affecting household app calculations.
-  date: 2024-10-28 12:09:01
-- bump: patch
-  changes:
-    fixed:
-    - NI threshold in 2027.
-  date: 2024-10-30 14:02:58
-- bump: minor
-  changes:
-    added:
-    - OBR Autumn 2024 EFO economic factors.
-  date: 2024-10-30 17:24:57
-- bump: patch
-  changes:
-    fixed:
-    - Bug in budget change reforms.
-  date: 2024-11-05 14:05:53
-- bump: minor
-  changes:
-    changed:
-    - Pinned UK data to 1.9.0.
-  date: 2024-11-28 16:54:41
-- bump: minor
-  changes:
-    fixed:
-    - Scottish baseline matched with Scottish Fiscal Commission.
-  date: 2024-12-04 16:48:42
-- bump: minor
-  changes:
-    added:
-    - Scottish Winter Fuel Payment equivalent.
-  date: 2024-12-05 12:43:06
-- bump: minor
-  changes:
-    removed:
-    - Unused parameters in the calibration folder.
-  date: 2025-02-11 11:14:35
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing non-default datasets to not execute.
-  date: 2025-02-18 16:22:32
-- bump: patch
-  changes:
-    fixed:
-    - Bug in LSRs.
-  date: 2025-02-25 14:33:57
-- bump: patch
-  changes:
-    fixed:
-    - Capital gains LSRs bug.
-  date: 2025-02-25 16:13:06
-- bump: patch
-  changes:
-    fixed:
-    - Bug in universal childcare entitlement.
-  date: 2025-02-27 14:23:28
-- bump: minor
-  changes:
-    added:
-    - Two-child limit reform proposal.
-  date: 2025-02-28 15:38:29
-- bump: minor
-  changes:
-    added:
-    - Two-child limit age exemption reform for Child Tax Credit.
-  date: 2025-02-28 16:39:12
-- bump: minor
-  changes:
-    added:
-    - Separate reforms to exempt parents of under [x] from the UC child limit and
-      from CTC child limit.
-  date: 2025-03-03 12:11:29
-- bump: patch
-  changes:
-    fixed:
-    - Bug in higher rate threshold timing.
-  date: 2025-03-19 20:33:18
-- bump: patch
-  changes:
-    fixed:
-    - PRs now run tests fully.
-  date: 2025-03-23 23:09:48
-- bump: patch
-  changes:
-    fixed:
-    - OBR forecast parameters now affect other parameters.
-  date: 2025-03-25 11:03:07
-- bump: patch
-  changes:
-    fixed:
-    - Baseline microsimulations break with no reform.
-  date: 2025-03-25 11:47:32
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing UK API impacts to fail.
-  date: 2025-03-26 14:42:25
-- bump: patch
-  changes:
-    changed:
-    - Updated with OBR forecast
-  date: 2025-03-26 17:50:04
-- bump: patch
-  changes:
-    fixed:
-    - Uprating that fails on ubuntu.
-  date: 2025-04-03 11:12:35
-- bump: patch
-  changes:
-    fixed:
-    - Bug in UC child limit calculation.
-  date: 2025-04-03 11:26:35
-- bump: minor
-  changes:
-    added:
-    - Rename 'study childcare entitlement' to 'care to learn'
-  date: 2025-04-07 09:00:36
-- bump: patch
-  changes:
-    fixed:
-    - Removed uk-data as a dependency from the package.
-  date: 2025-04-15 08:32:54
-- bump: patch
-  changes:
-    fixed:
-    - Corrected the is_parent variable to properly identify parents.
-    - Fixed logic in childcare programs to ensure accurate calculations.
-  date: 2025-04-15 14:14:21
-- bump: minor
-  changes:
-    added:
-    - Child eligible variables for childcare programs.
-  date: 2025-04-16 13:04:31
-- bump: patch
-  changes:
-    fixed:
-    - Delete redundant weeks_per_year file from extended childcare.
-  date: 2025-05-06 15:36:49
-- bump: patch
-  changes:
-    added:
-    - Added variable to represent partial usage of extended childcare entitlement
-      hours
-    - Updated extended childcare entitlement calculation to account for partial hours
-      usage
-  date: 2025-05-08 12:42:28
-- bump: minor
-  changes:
-    added:
-    - Public service spending variables.
-  date: 2025-05-21 09:46:26
-- bump: minor
-  changes:
-    fixed:
-    - Implemented 2016 Savings Credit eligibility restriction in Pension Credit.
-  date: 2025-05-22 11:02:05
-- bump: patch
-  changes:
-    fixed:
-    - Backdated parameters to 2015 for safety.
-  date: 2025-05-22 11:07:31
-- bump: minor
-  changes:
-    fixed:
-    - Pension Credit income sources.
-  date: 2025-05-22 11:22:00
-- bump: minor
-  changes:
-    fixed:
-    - Pension Credit income sources.
-  date: 2025-05-22 13:19:28
-- bump: patch
-  changes:
-    fixed:
-    - Removed duplicate parameters in Pension Credit.
-  date: 2025-05-27 10:44:15
-- bump: patch
-  changes:
-    fixed:
-    - Bug in employer NI incidence parameters.
-  date: 2025-05-28 09:03:21
-- bump: patch
-  changes:
-    changed:
-    - Refactored all Variable files to follow single-responsibility principle with
-      one Variable class per file.
-    - Split approximately 70 multi-Variable Python files into individual files, improving
-      code organization and maintainability.
-  date: 2025-06-06 16:15:25
-- bump: minor
-  changes:
-    added:
-    - Council tax projection parameters from OBR data.
-  date: 2025-06-09 09:54:52
-- bump: minor
-  changes:
-    changed:
-    - Updated employer National Insurance contribution rate to 15% from April 6, 2025.
-  date: 2025-06-09 11:32:22
-- bump: minor
-  changes:
-    added:
-    - ONS household population data from 2001-2043.
-    - Council tax per household projections from OBR data.
-    changed:
-    - Updated employer National Insurance contribution rate to 15% from April 6, 2025.
-  date: 2025-06-09 15:26:19
-- bump: minor
-  changes:
-    added:
-    - Winter Fuel Allowance means-testing reform.
-  date: 2025-06-11 08:59:43
-- bump: patch
-  changes:
-    added:
-    - Add test suite for abolition parameters functionality.
-  date: 2025-06-11 13:52:32
-- bump: patch
-  changes:
-    fixed:
-    - Bug with BRMA variable name.
-  date: 2025-06-12 12:42:27
-- bump: patch
-  changes:
-    fixed:
-    - Update UK parameters.
-  date: 2025-06-17 12:37:38
-- bump: patch
-  changes:
-    fixed:
-    - Abolish Council Tax has no budgetary impact.
-  date: 2025-06-30 11:28:06
-- bump: minor
-  changes:
-    added:
-    - Growth factor documentation.
-  date: 2025-07-09 12:34:06
-- bump: minor
-  changes:
-    fixed:
-    - Statutory maternity, paternity, and sick pay variables now use the `gov.obr.consumer_price_index`
-      for uprating.
-    - SSMG no longer is uprated by inflation.
-  date: 2025-07-10 10:02:17
-- bump: patch
-  changes:
-    fixed:
-    - Triple lock uses the average earnings index from the OBR.
-  date: 2025-07-10 12:10:52
-- bump: patch
-  changes:
-    fixed:
-    - Documentation improved for HBAI income concept.
-    - Restructured HBAI income variables to better match the official definition.
-  date: 2025-07-10 14:28:02
-- bump: patch
-  changes:
-    fixed:
-    - Bug in private pension income uprating.
-  date: 2025-07-10 15:42:46
-- bump: patch
-  changes:
-    added:
-    - Missing HBAI variables.
-  date: 2025-07-10 16:12:40
-- bump: patch
-  changes:
-    fixed:
-    - HBAI documentation updated to include Healthy Start vouchers and external child
-      payments.
-  date: 2025-07-10 16:14:53
-- bump: minor
-  changes:
-    changed:
-    - Earnings uprated with OBR average earnings rather than per-capita employment
-      income.
-  date: 2025-07-11 13:43:26
-- bump: patch
-  changes:
-    fixed:
-    - Private pension income index set to RPI<=5%
-  date: 2025-07-11 14:15:07
-- bump: minor
-  changes:
-    added:
-    - Documentation on growth factors.
-    - Cleaned up non-standard uprating factors for wealth variables.
-    - Added triple lock uprating detail and reform switches.
-    - Added ability to download entity datasets from HuggingFace.
-  date: 2025-07-13 13:11:45
-- bump: patch
-  changes:
-    fixed:
-    - Bug in loading entity tables.
-  date: 2025-07-13 19:47:46
-- bump: minor
-  changes:
-    added:
-    - Water bills projections.
-  date: 2025-07-14 10:36:08
-- bump: minor
-  changes:
-    fixed:
-    - Uprating for rent split by private and social rented sectors.
-  date: 2025-07-14 14:10:31
-- bump: patch
-  changes:
-    fixed:
-    - Lag CPI correctly for benefit uprating.
-  date: 2025-07-14 15:03:33
-- bump: patch
-  changes:
-    fixed:
-    - Temporarily suspended employer_ni_fixed_cost_change as it returns impacts in
-      the baseline.
-  date: 2025-07-15 08:50:48
-- bump: minor
-  changes:
-    added:
-    - Codecov coverage.
-    - Expanded .gitignore.
-  date: 2025-07-15 11:58:59
-- bump: patch
-  changes:
-    fixed:
-    - Improved water bills projections.
-  date: 2025-07-16 11:08:29
-- bump: patch
-  changes:
-    fixed:
-    - Use outturn data for council tax growth in England, Scotland, and Wales for
-      2023-2025.
-  date: 2025-07-17 10:41:08
-- bump: patch
-  changes:
-    fixed:
-    - NI domestic rates taken as reported.
-  date: 2025-07-17 12:45:26
-- bump: minor
-  changes:
-    added:
-    - UKMultiYearDataset class to handle multiple fiscal years.
-    - Uprating of datasets using the `uprate` method.
-  date: 2025-07-21 13:23:31
-- bump: patch
-  changes:
-    fixed:
-    - Bug in handling downloads of UKMultiYearDataset from HuggingFace.
-  date: 2025-07-21 15:37:49
-- bump: patch
-  changes:
-    fixed:
-    - Bug in uprating.
-  date: 2025-07-22 09:37:07
-- bump: minor
-  changes:
-    changed:
-    - Standardize decimals in parameters.
-  date: 2025-07-22 19:49:35
-- bump: patch
-  changes:
-    changed:
-    - Update microdf_python dependency to >=1.0.0.
-  date: 2025-07-22 20:55:35
-- bump: patch
-  changes:
-    fixed:
-    - debug LHA lowercase
-  date: 2025-07-24 10:30:43
-- bump: patch
-  changes:
-    fixed:
-    - change LHA param name
-  date: 2025-07-24 13:53:51
-- bump: patch
-  changes:
-    fixed:
-    - Parameterize age 35 threshold in LHA shared accommodation rules
-  date: 2025-07-24 14:41:02
-- bump: minor
-  changes:
-    changed:
-    - Add after housing costs deflator
-  date: 2025-07-25 08:57:23
-- bump: minor
-  changes:
-    added:
-    - Scenario class for reforms.
-    - Documentation of Scenario and Simulation.
-    - Standardisation of uprating behaviour.
-  date: 2025-07-26 11:31:02
-- bump: patch
-  changes:
-    changed:
-    - Add Python 3.13 support and update CI workflows
-    - Updated policyengine-core dependency to >=3.19.0 for Python 3.13 support
-    - Updated GitHub Actions to latest versions (checkout@v4, setup-python@v5) for
-      Python 3.13 compatibility
-    - Set all workflows to use Python 3.13
-    removed:
-    - Removed unused tables dependency that was blocking Python 3.13 compatibility
-  date: 2025-07-26 14:10:57
-- bump: patch
-  changes:
-    added:
-    - Add pydantic dependency to fix missing import in scenario utilities
-  date: 2025-07-26 20:54:03
-- bump: patch
-  changes:
-    changed:
-    - Separated out system.py to avoid bloat.
-  date: 2025-07-28 10:01:47
-- bump: patch
-  changes:
-    fixed:
-    - WFP reforms active.
-    - Growthfactors extended to 2040.
-  date: 2025-07-28 12:35:29
-- bump: patch
-  changes:
-    fixed:
-    - Minor missing variable attributes.
-  date: 2025-07-28 22:20:17
-- bump: minor
-  changes:
-    added:
-    - UC rebalancing reforms.
-  date: 2025-07-29 14:15:32
-- bump: patch
-  changes:
-    changed:
-    - HBAI benefits included at top level.
-  date: 2025-07-29 15:40:04
-- bump: minor
-  changes:
-    added:
-    - Docs upgraded to jupyter book 2.
-    - Model baseline page added.
-    - Capital gains tax baseline updated.
-  date: 2025-07-30 14:17:20
-- bump: patch
-  changes:
-    fixed:
-    - Bug caused by not resetting parameter caches.
-  date: 2025-07-31 13:39:16
-- bump: patch
-  changes:
-    fixed:
-    - Bug in NI rates.
-  date: 2025-08-01 09:00:11
-- bump: patch
-  changes:
-    fixed:
-    - Moved rent uprating to warning from error if before 2022.
-  date: 2025-08-04 12:54:43
-- bump: patch
-  changes:
-    changed:
-    - Dropped direct jupyter book dependency.
-  date: 2025-08-04 14:23:45
-- bump: patch
-  changes:
-    added:
-    - Utility function for comparing simulations added to `policyengine_uk.utils.compare`.
-  date: 2025-08-08 10:46:25
-- bump: minor
-  changes:
-    changed:
-    - Long-term OBR economic growfactors for 2030-10 and onwards.
-  date: 2025-08-08 11:34:55
-- bump: patch
-  changes:
-    fixed:
-    - Forecast window extended to 2030-31.
-  date: 2025-08-08 11:42:38
-- bump: patch
-  changes:
-    changed:
-    - Updated script to open automated API update PRs
-  date: 2025-08-08 15:09:27
-- bump: patch
-  changes:
-    fixed:
-    - Minor bug in comparison function.
-  date: 2025-08-09 09:01:58
-- bump: minor
-  changes:
-    fixed:
-    - Dropped support for <3.13.
-  date: 2025-08-12 09:29:55
-- bump: patch
-  changes:
-    fixed:
-    - Bug in multi year datasets.
-  date: 2025-08-12 09:48:46
-- bump: patch
-  changes:
-    fixed:
-    - Moved `Scenario` in top-level import.
-  date: 2025-08-12 14:17:09
-- bump: patch
-  changes:
-    fixed:
-    - Scenario class now supports all Reform object types and maintains backwards
-      compatibility.
-  date: 2025-08-13 08:14:33
-- bump: patch
-  changes:
-    fixed:
-    - Issue causing capital gains elasticities to not take effect.
-  date: 2025-08-14 16:30:16
-- bump: minor
-  changes:
-    fixed:
-    - Fuel duty is 52.95p per litre until 2026 where the temporary 5p cut is reversed,
-      and then risen with RPI
-  date: 2025-08-27 20:32:42
-- bump: minor
-  changes:
-    fixed:
-    - Baseline simulation created before simulation modifier is applied.
-  date: 2025-08-28 13:08:00
-- bump: patch
-  changes:
-    fixed:
-    - Re-enabled employer NI dynamics.
-  date: 2025-08-29 10:32:06
-- bump: patch
-  changes:
-    fixed:
-    - Fix bug in capital/consumer incidence.
-  date: 2025-08-29 13:54:13
-- bump: patch
-  changes:
-    fixed:
-    - Bug causing some households to claim both CTC and UC.
-  date: 2025-09-01 09:09:46
-- bump: patch
-  changes:
-    fixed:
-    - Fix behavioral response calculations returning zero FTE impacts due to simulation
-      state corruption
-    - Fix NaN values in wage relative change calculations during labor supply responses
-    - Fix income effect calculations by properly handling household_net_income timing
-  date: 2025-09-01 13:02:52
-- bump: patch
-  changes:
-    fixed:
-    - Removed bug-causing high income tax change variable.
-  date: 2025-09-02 13:00:40
-- bump: minor
-  changes:
-    fixed:
-    - Add real_hbai_household_net_income_ahc variable for convenience.
-  date: 2025-09-03 09:15:47
-- bump: minor
-  changes:
-    fixed:
-    - Update reduced vat expenditure share from OBR
-  date: 2025-09-10 09:28:56
-- bump: minor
-  changes:
-    fixed:
-    - Bugs in the benefit cap exemption list.
-  date: 2025-09-24 12:24:39
-- bump: patch
-  changes:
-    fixed:
-    - Updated carbon emissions data to latest available figures
-  date: 2025-09-24 15:33:18
-- bump: minor
-  changes:
-    fixed:
-    - Bugs in the benefit cap exemption list.
-  date: 2025-09-25 09:22:41
-- bump: patch
-  changes:
-    fixed:
-    - Temporarily disabled OBR participation responses.
-  date: 2025-09-29 12:26:51
-- bump: minor
-  changes:
-    added:
-    - Dataset filter function to extract single households for analysis.
-    changed:
-    - Default target variable for labour supply calculations to HBAI household net
-      income.
-    - Default adult count for labour supply calculations to 2.
-    fixed:
-    - Labour supply response calculation issues by removing inappropriate clipping
-      of marginal rates.
-    - Potential bug in labour supply response variable initialization order.
-  date: 2025-09-30 14:40:31
-- bump: patch
-  changes:
-    fixed:
-    - Fixed randomness between runs caused by UC reform.
-  date: 2025-10-15 12:18:22
-- bump: patch
-  changes:
-    fixed:
-    - Fix bug where changes to economic assumption parameters would not change uprating
-      behaviour.
-  date: 2025-10-17 15:01:31
-- bump: minor
-  changes:
-    fixed:
-    - Bug in state pension formulae causing issues when using datasets with year !=
-      2023.
-  date: 2025-10-20 12:43:40
-- bump: patch
-  changes:
-    fixed:
-    - Bug fix in state pension scripts.
-  date: 2025-10-20 12:51:40
-- bump: patch
-  changes:
-    fixed:
-    - Bug fix for decomp analysis.
-  date: 2025-10-21 12:08:26
-- bump: patch
-  changes:
-    added:
-    - Scenario now supports `applied_before_data_load` flag to control when parameter
-      changes and simulation modifiers are applied relative to data loading.
-  date: 2025-10-22 10:03:42
-- bump: minor
-  changes:
-    added:
-    - Salary sacrifice pension cap policy modeling (2,000 GBP cap on NI-exempt contributions)
-  date: 2025-11-20 12:24:29
-- bump: patch
-  changes:
-    changed:
-    - Updated microsimulation test expected values to reflect salary sacrifice calculation
-      improvements.
-    fixed:
-    - Salary sacrifice returned to income now cannot be negative.
-    - Adjusted salary sacrifice pension contributions now cannot go below zero.
-  date: 2025-11-20 14:51:58
-- bump: minor
-  changes:
-    changed:
-    - Salary sacrifice pension contributions above the cap are now redirected to employee
-      pension contributions (which receive income tax relief but pay NI) instead of
-      returning only to regular employment income. This better reflects the behavioral
-      assumption that individuals prioritize retirement savings.
-  date: 2025-11-21 14:59:20
-- bump: patch
-  changes:
-    fixed:
-    - Correct OBR March 2025 economic projections to match detailed forecast tables
-  date: 2025-11-26 18:40:43
-- bump: minor
-  changes:
-    changed:
-    - Update economic projections to OBR November 2025 Economic and Fiscal Outlook
-      forecasts (CPI, RPI, CPIH, average earnings, house prices, rents, mortgage interest)
-  date: 2025-11-26 19:23:28
-- bump: minor
-  changes:
-    added:
-    - Implement November 2025 Autumn Budget income source tax rate increases. Dividends
-      +2pp basic/higher from April 2026, savings +2pp from April 2027, property +2pp
-      from April 2027.
-  date: 2025-11-27 09:29:34
-- bump: minor
-  changes:
-    added:
-    - November 2025 Autumn Budget parameter updates. Extends income tax threshold
-      freeze (personal allowance GBP 12,570, higher rate GBP 50,270, additional rate
-      GBP 125,140) and NICs secondary threshold freeze (GBP 96/week) to April 2031.
-      Updates fuel duty schedule with freeze until September 2026, staggered 5p cut
-      reversal, and RPI uprating from April 2027.
-  date: 2025-11-27 16:24:25
-- bump: minor
-  changes:
-    added:
-    - Add student loan repayment modelling with parameters for Plan 1, 2, 4, 5 and
-      postgraduate loans, including thresholds and repayment rates.
-  date: 2025-11-28 11:59:37
-- bump: patch
-  changes:
-    fixed:
-    - Update HH net income calculation.
-  date: 2025-11-28 13:48:04
-- bump: patch
-  changes:
-    fixed:
-    - Fix fuel duty rates to use calendar year averages instead of incorrectly selecting
-      first rate of each year in reform calculations. Updates 2026-2029 rates to weighted
-      averages (53.45p, 59.02p, 61.11p, 62.90p) with detailed documentation of actual
-      source values and calculation methodology.
-  date: 2025-11-28 14:58:06
-- bump: patch
-  changes:
-    added:
-    - "Add 2026 Plan 2 student loan interest rate thresholds (lower \xA329,385, upper\
-      \ \xA352,885) and freeze lower threshold 2027-2029 per Budget 2025"
-  date: 2025-12-01 03:34:34
-- bump: patch
-  changes:
-    changed:
-    - Vectorised BRMA LHA rate lookup for ~3s speedup on calculate calls.
-  date: 2025-12-01 11:11:26
-- bump: minor
-  changes:
-    added:
-    - Add owns vehicle variable
-  date: 2025-12-02 09:19:36
-- bump: patch
-  changes:
-    added:
-    - Add upper interest threshold freeze for Plan 2 student loans (Budget 2025)
-  date: 2025-12-02 14:16:53
-- bump: minor
-  changes:
-    added:
-    - Added gift_aid_grossed_up variable that computes Gift Aid grossed up by basic
-      rate per ITA 2007 s.58.
-    - Added comprehensive Gift Aid tests covering basic rate relief, higher rate relief,
-      and PA taper interaction.
-    changed:
-    - Added legislation references (legislation.gov.uk) to gift_aid and personal_allowance
-      variables.
-    fixed:
-    - Fixed Personal Allowance taper calculation to deduct grossed-up Gift Aid from
-      ANI per ITA 2007 s.58. Previously, Gift Aid donations did not reduce ANI for
-      PA taper purposes, causing high earners (GBP 100k-125k) to receive less tax
-      relief than legally entitled.
-  date: 2025-12-02 16:24:40
-- bump: minor
-  changes:
-    added:
-    - Two child limit repeal from April 2026 (Autumn Budget 2025) - sets UC and Tax
-      Credits child element limit to infinity
-    - "Salary sacrifice pension cap of \uFFFD2,000 from April 2029 (Autumn Budget\
-      \ 2025)"
-    - Move inflation adjustment AHC back to BHC inflation.
-  date: 2025-12-03 11:59:49
-- bump: patch
-  changes:
-    fixed:
-    - Print statement.
-  date: 2025-12-03 12:45:46
-- bump: minor
-  changes:
-    fixed:
-    - Extend fiscal year parameter conversion to cover 2015-2040, fixing issues where
-      policies changing on April 6 (UK fiscal year start) were not reflected in simulations
-      for years 2026+.
-  date: 2025-12-03 16:17:09
-- bump: patch
-  changes:
-    changed:
-    - Bump policyengine-core to 3.23.0 (adds strict enum validation).
-  date: 2025-12-04 14:45:58
-- bump: patch
-  changes:
-    fixed:
-    - Fix fuel duty rates to use OBR November 2025 RPI forecasts.
-  date: 2025-12-05 16:29:26
-- bump: patch
-  changes:
-    added:
-    - Salary sacrifice pension cap reform (GBP 2,000 cap from April 2029) with broad-base
-      employer response modeling.
-  date: 2025-12-08 10:54:42
-- bump: patch
-  changes:
-    fixed:
-    - Basic state pension calculation.
-  date: 2025-12-08 21:37:03
-- bump: patch
-  changes:
-    fixed:
-    - Correct 2025-26 benefit cap rates (were incorrectly showing uprated values;
-      benefit cap has been frozen since 2023)
-    - Update UC parameter legislation references to point to exact regulation sections
-      on legislation.gov.uk
-    - Add missing 2025-26 Universal Credit non-dependent deduction amount (GBP 93.02)
-  date: 2025-12-08 22:13:29
-- bump: patch
-  changes:
-    fixed:
-    - Fixed employer_ni_fixed_employer_cost_change variable returning impacts in baseline
-      scenarios by correcting baseline parameter access.
-  date: 2025-12-09 08:44:22
-- bump: patch
-  changes:
-    added:
-    - Add savings, net_financial_wealth, gross_financial_wealth, and shareholding
-      to total_wealth calculation
-  date: 2025-12-09 09:47:39
-- bump: patch
-  changes:
-    added:
-    - Legislative references for marriage allowance take-up rate (Income Tax Act 2007
-      s. 55B)
-    - Legislative references for married couple's allowance deduction rate (Income
-      Tax Act 2007 s. 46)
-    - Legislative references for income tax additions and subtractions (Income Tax
-      Act 2007 s. 23)
-    - Labels for 11 HMRC income tax parameters including annual allowance, personal
-      savings allowance, and savings starter rate parameters
-    changed:
-    - All HMRC income tax parameters now have proper labels and legislative references
-  date: 2025-12-09 10:09:16
-- bump: patch
-  changes:
-    fixed:
-    - Refactor variables with redundant adds/subtracts and formula definitions to
-      prevent sync issues
-  date: 2025-12-09 16:16:37
-- bump: minor
-  changes:
-    fixed:
-    - LHA freeze parameter.
-  date: 2026-01-12 16:12:34
-- bump: minor
-  changes:
-    added:
-    - Scottish Child Payment - a benefit provided by Social Security Scotland for
-      eligible children under 16 in low-income families receiving qualifying benefits
-      (UC, tax credits, etc.).
-  date: 2026-01-13 14:23:42
-- bump: minor
-  changes:
-    added:
-    - 2025-26 Scottish income tax rates.
-  date: 2026-01-13 15:46:23
-- bump: patch
-  changes:
-    fixed:
-    - Dataset uprating bug where region values weren't converted to strings for rent
-      indexing
-    - Salary sacrifice default behavior to be static (0) instead of fully optimized
-      (1.0)
-  date: 2026-01-13 17:13:11
-- bump: minor
-  changes:
-    added:
-    - Scottish Child Payment baby bonus reform.
-  date: 2026-01-15 15:17:19
-- bump: minor
-  changes:
-    changed:
-    - Remove randomness from country package by moving stochastic variable generation
-      to data package. Variables now read pre-computed values from datasets for deterministic,
-      reproducible calculations.
-  date: 2026-01-17 04:45:58
-- bump: patch
-  changes:
-    fixed:
-    - CI now runs on dependency updates (pyproject.toml, uv.lock changes)
-    - Fixed Scottish Child Payment test format to use array notation for person-level
-      output
-  date: 2026-01-17 17:17:54
-- bump: patch
-  changes:
-    added:
-    - Per-value legislative references for income tax allowances and minimum wage
-      rates
-  date: 2026-01-17 17:37:48
-- bump: patch
-  changes:
-    fixed:
-    - Extended childcare entitlement hours expansion date corrected from 2026-01-01
-      to 2025-09-01 for children aged 9 months to 2 years, implementing the September
-      2025 policy change that doubled free childcare from 15 to 30 hours per week
-      for working parents.
-  date: 2026-01-17 17:42:23
-- bump: patch
-  changes:
-    changed:
-    - Standardized all parameter labels to use sentence case, while preserving proper
-      names (e.g., "Bank of England", "Child Benefit") and acronyms (e.g., "HMRC",
-      "VAT", "NHS")
-  date: 2026-01-17 17:45:51
-- bump: patch
-  changes:
-    fixed:
-    - CI workflows now handle missing HUGGING_FACE_TOKEN gracefully, allowing Dependabot
-      PRs to run tests without failing on empty Bearer token errors.
-  date: 2026-01-17 18:05:46
-- bump: patch
-  changes:
-    fixed:
-    - Fixed Scottish Child Payment baby bonus reform to use Person-level variable
-      structure, matching the refactored base variable. The reform now correctly uses
-      parameterized baby bonus rates instead of hardcoded values.
-    - Fixed SCP baby bonus effective date to 2027-04-01 (fiscal year 2027-28) per
-      Scottish Budget 2026-27.
-  date: 2026-01-17 18:33:41
-- bump: patch
-  changes:
-    fixed:
-    - Skip behavioral response tests when HUGGING_FACE_TOKEN is not available (enables
-      Dependabot PRs to pass CI).
-  date: 2026-01-17 18:37:47
-- bump: minor
-  changes:
-    added:
-    - Scottish Child Payment increased to 28.20/week for 2026-27, per Scottish Budget
-      2026-27.
-  date: 2026-01-17 18:39:20
-- bump: patch
-  changes:
-    fixed:
-    - Reverted premature SCP 2026-27 rate increase (not yet law).
-    - "Refactored SCP baby bonus reform to use \xA340/week total as the policy parameter\
-      \ instead of a fixed bonus amount."
-  date: 2026-01-17 18:54:27
-- bump: minor
-  changes:
-    added:
-    - Scottish Child Payment rates from 2026-27 to 2030-31 per Scottish Fiscal Commission
-      forecasts.
-    - Scottish Child Payment baby boost under-1 total from 2027-28 to 2030-31 per
-      SFC forecasts.
-    - CPI uprating for SCP parameters for projections beyond 2030-31.
-  date: 2026-01-20 12:32:14
-- bump: patch
-  changes:
-    fixed:
-    - Add 2026-27 Scottish income tax threshold freeze to baseline (higher, advanced,
-      and top rates) per Scottish Budget 2025-26.
-  date: 2026-01-20 12:44:50
-- bump: patch
-  changes:
-    fixed:
-    - Scottish top rate (48%) threshold corrected from 125,140 to 112,570 (above personal
-      allowance). The threshold was incorrectly stored as the total income value instead
-      of the amount above PA, causing the top rate to effectively start at 137,710
-      instead of 125,140.
-  date: 2026-01-21 11:55:12
-- bump: patch
-  changes:
-    changed:
-    - Bumped policyengine-core minimum version to 3.23.5 for pandas 3.0 compatibility
-  date: 2026-01-25 14:13:02
-- bump: patch
-  changes:
-    changed:
-    - Vectorised BRMA LHA rate lookup for ~3s speedup on calculate calls.
-  date: 2026-02-18 10:18:43
-- bump: minor
-  changes:
-    added:
-    - Student loan plan uprating in economic assumptions: re-labels Plan 1/2/5 each
-        year based on cohort start year, writes off loans after 29 years, and samples
-        new Plan 5 entrants for England using empirical age/income take-up probabilities.
-  date: 2026-02-19 17:30:26
-- bump: patch
-  changes:
-    fixed:
-    - Skip student loan uprating if column doesn't exist yet during dataset creation.
-  date: 2026-02-19 17:57:15
-- bump: patch
-  changes:
-    fixed:
-    - Enum columns now decode to string labels when accessing .person/.benunit/.household
-      on datasets loaded via non-URL paths (e.g. UKSingleYearDataset or UKMultiYearDataset
-      passed directly)
-  date: 2026-02-23 13:07:05
-- bump: minor
-  changes:
-    fixed:
-    - Include employer pension contributions and salary sacrifice in the Annual Allowance
-      tax charge calculation, per Finance Act 2004 s.233.
-  date: 2026-02-23 13:44:25
diff --git a/policyengine_uk/tests/microsimulation/reforms_config.yaml b/policyengine_uk/tests/microsimulation/reforms_config.yaml
index af9f1a57a..be5a7f8ea 100644
--- a/policyengine_uk/tests/microsimulation/reforms_config.yaml
+++ b/policyengine_uk/tests/microsimulation/reforms_config.yaml
@@ -16,7 +16,7 @@ reforms:
   parameters:
     gov.hmrc.child_benefit.amount.additional: 25
 - name: Reduce Universal Credit taper rate to 20%
-  expected_impact: -43.2
+  expected_impact: -41.9
   parameters:
     gov.dwp.universal_credit.means_test.reduction_rate: 0.2
 - name: Raise Class 1 main employee NICs rate to 10%
diff --git a/pyproject.toml b/pyproject.toml
index bcad6ebf4..fb790af51 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,10 +67,44 @@ dev = [
     "snowballstemmer>=2,<3",
     "jupyter-book>=2.0.0a0",
     "linecheck",
-    "rich",
+    "rich",    "towncrier>=24.8.0",
+
 ]
 
 [tool.pytest.ini_options]
 markers = [
     "microsimulation: marks tests that use full microsimulation (deselect with '-m \"not microsimulation\"')",
 ]
+
+[tool.towncrier]
+package = "policyengine_uk"
+directory = "changelog.d"
+filename = "CHANGELOG.md"
+title_format = "## [{version}] - {project_date}"
+issue_format = ""
+underlines = ["", "", ""]
+
+[[tool.towncrier.type]]
+directory = "breaking"
+name = "Breaking changes"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "added"
+name = "Added"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "changed"
+name = "Changed"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "fixed"
+name = "Fixed"
+showcontent = true
+
+[[tool.towncrier.type]]
+directory = "removed"
+name = "Removed"
+showcontent = true