diff --git a/src/components/base-address/BaseAddress.vue b/src/components/base-address/BaseAddress.vue
index 2660fceb..980de099 100644
--- a/src/components/base-address/BaseAddress.vue
+++ b/src/components/base-address/BaseAddress.vue
@@ -228,24 +228,25 @@ export default class BaseAddress extends Mixins(ValidationMixin, CountriesProvin
   readonly isInactive: boolean
 
   /** Called, possibly externally, to validate all registered form inputs. */
-  public validate (): any {
+  public async validate (): Promise<boolean> {
     this.postalCodeRulesEnabled = true
+    await Vue.nextTick() // ensure postal code rules are functional before validating
     return this.$refs.addressForm.validate()
   }
 
   /** Called, possibly externally, to reset validation of all registered form inputs and clear their values. */
-  public reset (): any {
+  public reset (): void {
     this.postalCodeRulesEnabled = false
     return this.$refs.addressForm.reset()
   }
 
   /** Called, possibly externally, to reset validation of all registered form inputs without modifying their values. */
-  public resetValidation (): any {
+  public resetValidation (): void {
     return this.$refs.addressForm.resetValidation()
   }
 
   /** When country changes, resets fields. */
-  onCountryChange () {
+  onCountryChange (): void {
     this.addressLocal['addressRegion'] = ''
     this.addressLocal['postalCode'] = ''
     // clear any existing validation errors
diff --git a/src/components/completing-party/CompletingParty.vue b/src/components/completing-party/CompletingParty.vue
index 12c3d8e0..c3678820 100644
--- a/src/components/completing-party/CompletingParty.vue
+++ b/src/components/completing-party/CompletingParty.vue
@@ -219,9 +219,9 @@ export default class CompletingParty extends Vue {
 
   /** When prop changes, validate the components. */
   @Watch('validate')
-  private onValidate (): void {
+  private async onValidate (): Promise<void> {
     this.$refs.completingPartyForm && this.$refs.completingPartyForm.validate()
-    this.$refs.mailingAddress && this.$refs.mailingAddress.validate()
+    this.$refs.mailingAddress && await this.$refs.mailingAddress.validate()
   }
 
   /** When prop changes, update local object. */