diff --git a/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.js b/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.js
index 418033b0f..83de8eced 100644
--- a/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.js
+++ b/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.js
@@ -177,11 +177,12 @@ export default class CommonSelectLandParcelPageController extends LandGrantsQues
     const landParcelMetadata = selectedParcelIds.map((id) => {
       const parcel = parcelMap.get(id)
       const rawArea = parcel?.area?.value
-      return { parcelId: id, areaHa: rawArea == null ? null : Number(rawArea) }
+      const areaHa = rawArea == null ? null : (Number(rawArea) * 10000) / 10000
+      return { parcelId: id, areaHa }
     })
 
     const totalHectaresForSelectedParcels =
-      Math.round(landParcelMetadata.reduce((sum, { areaHa }) => sum + (areaHa ?? 0), 0) * 10000) / 10000
+      (landParcelMetadata.reduce((sum, { areaHa }) => sum + (areaHa ?? 0), 0) * 10000) / 10000
 
     if (this.minimumAreaHa !== null && totalHectaresForSelectedParcels < this.minimumAreaHa) {
       const parcels = mapParcelsToViewModel(fetchedParcels)
diff --git a/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.test.js b/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.test.js
index ed7c66912..8fa233bd8 100644
--- a/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.test.js
+++ b/src/server/land-grants/common/common-select-parcel/common-select-land-parcel-page.controller.test.js
@@ -244,7 +244,7 @@ describe('CommonSelectLandParcelPageController', () => {
       expect(controller.setState).not.toHaveBeenCalled()
     })
 
-    it('rounds totalHectaresForSelectedParcels to 4dp to avoid float precision issues', async () => {
+    it('passes parcel area sum to GAS', async () => {
       fetchParcels.mockResolvedValue([
         { sheetId: 'S1', parcelId: 'P1', area: { value: 25.3874 } },
         { sheetId: 'S2', parcelId: 'P2', area: { value: 169.8586 } }
@@ -260,12 +260,13 @@ describe('CommonSelectLandParcelPageController', () => {
 
       await controller.handlePost(request, context, h)
 
+      const expectedTotal = 25.3874 + 169.8586
       expect(controller.mergeState).toHaveBeenCalledWith(
         request,
         context.state,
         expect.objectContaining({
-          totalHectaresForSelectedParcels: 195.246,
-          additionalAnswers: { totalHectaresForSelectedParcels: 195.246 }
+          totalHectaresForSelectedParcels: expectedTotal,
+          additionalAnswers: { totalHectaresForSelectedParcels: expectedTotal }
         })
       )
     })
diff --git a/src/server/woodland/woodland-hectares-page.controller.js b/src/server/woodland/woodland-hectares-page.controller.js
index e3492d833..1aa536da3 100644
--- a/src/server/woodland/woodland-hectares-page.controller.js
+++ b/src/server/woodland/woodland-hectares-page.controller.js
@@ -13,10 +13,9 @@ const HECTARES_OVER_TEN_FIELD_NAME = 'hectaresTenOrOverYearsOld'
 const HECTARES_UNDER_TEN_FIELD_NAME = 'hectaresUnderTenYearsOld'
 
 const ERROR_BELOW_MINIMUM = `The total area of woodland must be at least ${MIN_WOODLAND_TOTAL_AREA_HA}ha`
-const truncate4dp = (/** @type {number} */ n) => Math.floor(n * 10000) / 10000
 
 const errorExceedsMax = (/** @type {number} */ max) =>
-  `Total area of woodland cannot be more than total area of selected land parcels (${truncate4dp(max)}ha)`
+  `Total area of woodland cannot be more than total area of selected land parcels (${max}ha)`
 
 /**
  * @param {string} fieldName
@@ -53,7 +52,7 @@ export default class WoodlandHectaresPageController extends TaskPageController {
 
   getViewModel(request, context) {
     const { state } = context
-    const totalHectaresForSelectedParcels = truncate4dp(Number(state['totalHectaresForSelectedParcels'] ?? 0))
+    const totalHectaresForSelectedParcels = Number(state['totalHectaresForSelectedParcels'] ?? 0)
     const viewModel = /** @type {Record<string, any>} */ (super.getViewModel(request, context))
 
     const guidanceIndex = viewModel.components?.findIndex(