diff --git a/app/services/licences/supplementary/determine-return-log-years.service.js b/app/services/licences/supplementary/determine-return-log-years.service.js
index a646068679..649ec0abf9 100644
--- a/app/services/licences/supplementary/determine-return-log-years.service.js
+++ b/app/services/licences/supplementary/determine-return-log-years.service.js
@@ -8,6 +8,7 @@
 const { ref } = require('objection')
 
 const ReturnLogModel = require('../../../models/return-log.model.js')
+const LicenceModel = require('../../../models/licence.model.js')
 
 const SROC_START_DATE = new Date('2022-04-01')
 
@@ -34,7 +35,14 @@ async function go (returnLogId) {
     flagForBilling: false
   }
 
+  if (startDate < SROC_START_DATE) {
+    // As the returns start date is before the SROC start date, we need to flag the return for pre sroc billing
+    await _flagLicenceForPreSrocSupplementary(licence.id)
+  }
+
   if (endDate < SROC_START_DATE) {
+    // If the end date of the return is before the start of SROC then we do not need to flag the licence for sroc
+    // supplementary billing
     return result
   }
 
@@ -63,6 +71,12 @@ async function _fetchReturnLog (returnLogId) {
     })
 }
 
+async function _flagLicenceForPreSrocSupplementary (licenceId) {
+  return LicenceModel.query()
+    .patch({ includeInPresrocBilling: 'yes' })
+    .where('id', licenceId)
+}
+
 module.exports = {
   go
 }
diff --git a/test/services/licences/supplementary/determine-return-log-years.service.test.js b/test/services/licences/supplementary/determine-return-log-years.service.test.js
index 9ec11a7ef9..54e25232cd 100644
--- a/test/services/licences/supplementary/determine-return-log-years.service.test.js
+++ b/test/services/licences/supplementary/determine-return-log-years.service.test.js
@@ -9,6 +9,7 @@ const { expect } = Code
 
 // Test helpers
 const LicenceHelper = require('../../../support/helpers/licence.helper.js')
+const LicenceModel = require('../../../../app/models/licence.model.js')
 const ReturnLogHelper = require('../../../support/helpers/return-log.helper.js')
 
 // Thing under test
@@ -44,6 +45,14 @@ describe('Determine Return Log Years Service', () => {
           expect(result.flagForBilling).to.equal(false)
           expect(result.twoPartTariff).to.equal(false)
         })
+
+        it('does not flag the licence for pre sroc supplementary billing', async () => {
+          await DetermineReturnLogYearsService.go(returnLog.id)
+
+          const result = await LicenceModel.query().select(['includeInPresrocBilling']).where('id', licence.id)
+
+          expect(result[0].includeInPresrocBilling).to.equal('no')
+        })
       })
 
       describe('and two-part tariff is true', () => {
@@ -77,6 +86,14 @@ describe('Determine Return Log Years Service', () => {
           expect(result.flagForBilling).to.equal(false)
           expect(result.twoPartTariff).to.equal(true)
         })
+
+        it('flags the licence for pre sroc supplementary billing', async () => {
+          await DetermineReturnLogYearsService.go(returnLog.id)
+
+          const result = await LicenceModel.query().select(['includeInPresrocBilling']).where('id', licence.id)
+
+          expect(result[0].includeInPresrocBilling).to.equal('yes')
+        })
       })
 
       describe('and the end date is after the SROC billing start date', () => {
@@ -95,6 +112,14 @@ describe('Determine Return Log Years Service', () => {
           expect(result.flagForBilling).to.equal(true)
           expect(result.twoPartTariff).to.equal(true)
         })
+
+        it('flags the licence for pre sroc supplementary billing', async () => {
+          await DetermineReturnLogYearsService.go(returnLog.id)
+
+          const result = await LicenceModel.query().select(['includeInPresrocBilling']).where('id', licence.id)
+
+          expect(result[0].includeInPresrocBilling).to.equal('yes')
+        })
       })
     })
   })