diff --git a/src/components/staff-payment/StaffPayment.stories.ts b/src/components/staff-payment/StaffPayment.stories.ts
index ed12580a..cbb19d74 100644
--- a/src/components/staff-payment/StaffPayment.stories.ts
+++ b/src/components/staff-payment/StaffPayment.stories.ts
@@ -27,3 +27,14 @@ export const Default = Template.bind({})
 Default['args'] = {
   staffPaymentData: staffPaymentData
 }
+
+export const BcolWithLowerCaseDatNumber = Template.bind({})
+BcolWithLowerCaseDatNumber['args'] = {
+  staffPaymentData: {
+    ...staffPaymentData,
+    option: StaffPaymentOptions.BCOL,
+    bcolAccountNumber: '123456',
+    datNumber: 'c1234567'
+  } as StaffPaymentIF,
+  validate: true
+}
diff --git a/src/components/staff-payment/StaffPayment.vue b/src/components/staff-payment/StaffPayment.vue
index e54b28bf..adde3335 100644
--- a/src/components/staff-payment/StaffPayment.vue
+++ b/src/components/staff-payment/StaffPayment.vue
@@ -196,7 +196,7 @@ export default class StaffPayment extends Vue {
   /** Validation rules for DAT Number. */
   readonly datNumberRules: Array<(v) => boolean | string> = [
     v => !!v || 'Enter DAT Number',
-    v => /^[A-Z]{1}[0-9]{7,9}$/.test(v) || 'DAT Number must be in standard format (eg, C1234567)'
+    v => /^[A-Za-z]{1}[0-9]{7,9}$/.test(v) || 'DAT Number must be in standard format (eg, C1234567)'
   ]
 
   /** Called when component is mounted. */
@@ -281,7 +281,8 @@ export default class StaffPayment extends Vue {
         return { option, routingSlipNumber, isPriority } as StaffPaymentIF
 
       case StaffPaymentOptions.BCOL:
-        return { option, bcolAccountNumber, datNumber, folioNumber, isPriority } as StaffPaymentIF
+        // upper case the DAT number so a lower case leading letter is accepted and normalized
+        return { option, bcolAccountNumber, datNumber: datNumber.toUpperCase(), folioNumber, isPriority } as StaffPaymentIF
 
       case StaffPaymentOptions.NO_FEE:
         return { option } as StaffPaymentIF
diff --git a/src/components/staff-payment/package.json b/src/components/staff-payment/package.json
index c3ff48f7..d5df3da9 100644
--- a/src/components/staff-payment/package.json
+++ b/src/components/staff-payment/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@bcrs-shared-components/staff-payment",
-  "version": "2.1.76",
+  "version": "2.1.77",
   "publishConfig": {
     "access": "public"
   },
diff --git a/tests/unit/BaseAddress.spec.ts b/tests/unit/BaseAddress.spec.ts
index 780140e3..1ea9953d 100644
--- a/tests/unit/BaseAddress.spec.ts
+++ b/tests/unit/BaseAddress.spec.ts
@@ -179,18 +179,27 @@ describe('BaseAddress - valid event (#34469)', () => {
     }
   })
 
-  it('emits valid=true after validate() on a fully valid address', async () => {
+  it('emits valid=true after validate() once an invalid postal code is corrected', async () => {
+    // start invalid (empty, required postal code) so the validity watcher has a change to react to
     wrapper = mount(BaseAddress, {
       vuetify,
-      propsData: { schema, editing: true, address }
+      propsData: { schema, editing: true, address: { ...address, postalCode: '' } }
     })
     await Vue.nextTick()
+    expect(wrapper.vm.isPostalCodeValid).toBe(false)
 
-    await wrapper.vm.validate()
+    // correct the postal code, then validate as the consuming app does on submit
+    const postalCode = wrapper.find('.postal-code input')
+    await postalCode.setValue('V8V 1V1')
+    await Vue.nextTick()
+
+    expect(await wrapper.vm.validate()).toBe(true)
     await Vue.nextTick()
 
     const validEvents = wrapper.emitted('valid')
     expect(validEvents).toBeTruthy()
     expect(validEvents[validEvents.length - 1][0]).toBe(true)
+    expect(wrapper.vm.isPostalCodeValid).toBe(true)
+    expect(wrapper.vm.addressFormValid).toBe(true)
   })
 })
diff --git a/tests/unit/StaffPayment.spec.ts b/tests/unit/StaffPayment.spec.ts
index 436833c9..e8409c7a 100644
--- a/tests/unit/StaffPayment.spec.ts
+++ b/tests/unit/StaffPayment.spec.ts
@@ -428,4 +428,51 @@ describe('StaffPayment', () => {
     // Confirm validation
     expect(vm.validate).toBe(true)
   })
+
+  it('accepts a lower or upper case leading letter in the DAT Number', async () => {
+    const wrapper = mount(StaffPayment, { vuetify })
+    await Vue.nextTick()
+
+    const vm: any = wrapper.vm
+    const formatRule = vm.datNumberRules[1]
+
+    // valid formats
+    expect(formatRule('C1234567')).toBe(true)
+    expect(formatRule('c1234567')).toBe(true)
+    expect(formatRule('c123456789')).toBe(true)
+
+    // invalid formats
+    expect(formatRule('1234567')).toBe('DAT Number must be in standard format (eg, C1234567)')
+    expect(formatRule('C123456')).toBe('DAT Number must be in standard format (eg, C1234567)')
+    expect(formatRule('CC1234567')).toBe('DAT Number must be in standard format (eg, C1234567)')
+
+    wrapper.destroy()
+  })
+
+  it('emits the DAT Number in upper case', async () => {
+    const wrapper = mount(StaffPayment, {
+      vuetify,
+      propsData: {
+        staffPaymentData: {
+          option: 2, // BCOL
+          bcolAccountNumber: '123456',
+          datNumber: ''
+        }
+      }
+    })
+    await Vue.nextTick()
+
+    await wrapper.find('#dat-number-textfield').setValue('c1234567')
+
+    // @Emit emits the return value first, followed by the original argument
+    expect(wrapper.emitted('update:staffPaymentData').pop()[0]).toEqual({
+      option: 2, // BCOL
+      bcolAccountNumber: '123456',
+      datNumber: 'C1234567',
+      folioNumber: '',
+      isPriority: false
+    })
+
+    wrapper.destroy()
+  })
 })