TCM0218020 - Tax Credits Manual - HMRC internal manual
If the customer wants to repay their overpayment back quicker, go to Step 29 If the customer has repaid all their overpayment but recoveries are still being made, go to Step 30 Step 5 If tax credit is in not payment, go to Step 6 If tax credit is in payment, go to Step 8 Step 6 Check the reason the award is not in payment. If the award has ceased because the claimant has moved to Universal Credit(UC), or if the debt has been passed to Department for Work and Pensions (DWP), go to Step 31. If CPAC is the reason the award is not in payment,
Source: gov.uk