COM81022 - Interest: interest work lists: credit interest work list (CDIW) - Banking Operations (Action Guide)
Source: gov.uk (2025-12-08)


This page is currently under review

To deal with cases on the ‘Credit Interest’ work list consider steps 1 - 21 below. The guide is presented as follows.

Step 1 Initial action (#IDATL4YB)

Step 2 Establishing why the case is on the work list (#IDA5M4YB)

Step 3 Calculating a manual interest charge for a non QIP case (#IDA1O4YB)

Steps 4 - 9 Calculating a manual interest charge for a non QIP case (#IDA1O4YB)

Steps 10 - 13 Calculating a manual interest charge for a QIP case (#IDAZX4YB)

Step 14 Raising / Increasing a manual interest charge (#IDAK34YB)

Steps 15 - 17 Reducing a manual interest charge (#IDAX44YB)

Step 18 Pursuit action where amounts unpaid (#IDAWA5YB)

Step 19 Dealing with an overpayment (#IDAOC5YB)

Step 20 Straddling AP with S501A charge (#IDAHF5YB)

Step 21 To delete a case from the CDIW work list (#IDA4H5YB)

Initial action

Please note that you cannot normally calculate Debit Interest or Credit Interest until after the normal due date for the Accounting Period (AP). However, where the tax charge is nil, and all tax has been repaid then a credit interest charge can be raised before the due date.

1. Use function CDIW (Credit Interest work list) to display the work list and select the entry that you want to work.

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Establishing why the case is on the work list

2. Select the [View] button to see all available details for the case including the reason for entry onto the list.

Please note that the reason shown will reflect why the case was originally put onto the list. It will only reflect any subsequent changes if the case has previously been deleted and the list has been re-populated with a new entry.

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Checking the Quarterly Instalment Payment (QIP) signal

3. Use function DAPD (Display AP Details) or function RAPP (Revise AP Pursuit) to check and note the current Quarterly Instalment Payment (QIP) signal for the Accounting Period (AP). Where the QIP signal is ‘N’ go to step 4. Where the QIP signal is ‘Y’ go to step 10

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Calculating a manual interest charge for a non QIP case

4. Use function VPPD (View Payment and Postings Details) to check the payment and interest position on the Acounting Period (AP) record.

5. If payments received on or after the normal due date (please see Glossary), credit interest is not due. Delete the case from the work list.

6. If any payments received before the normal due date credit interest is due from the later of:
- the EDP
or
- the first instalment due date if the AP had been a QIP case
to the normal due date

7. To calculate the credit interest due you can use any of the following functions:
- function CINT - Compute Interest
or
- function DINT - Display Interest Computation
or
- function RMIC - Raise Manual Interest Charge
For further information on how to calculate and raise credit interest see the Action Guides ‘Clerical Calculation of Credit/Debit Interest’ (COM80084 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80084)) in section ‘How Interest is Calculated’

8. If you need to raise a manual credit/debit interest charge go to step 12

9. If a manual credit/debit interest charge is not appropriate go to step 20

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Calculating a manual interest charge for a QIP case

10. Use function VPPD (View Payment and Postings Details) to check the payment and interest position on the Accounting Period (AP) record.

11. To calculate the credit interest due you can use any of the following functions:
- function CINT - Compute Interest
or
- function DINT - Display Interest Computation
or
- function RMIC - Raise Manual Interest Charge
For further information on how to calculate and raise credit interest see the Action Guides ‘Clerical Calculation of Credit/Debit Interest’ (COM80084 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80084)) in section ‘How Interest is Calculated’.

12. If you need to raise a manual credit/debit interest charge go to step 14.

13. If a manual credit/debit interest charge is not appropriate go to step 22.

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Raising / Increasing a manual interest charge

14. Use function RMIC (Raise Manual Interest Charge) to Calculate and post Credit and/or Debit Interest. For more information see the Action Guides ‘Clerical Calculation of Credit/Debit Interest’ (COM80084 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80084)) in section ‘How Interest Is Calculated’

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Reducing a manual interest charge

15. Use function RMIC (Raise Manual Interest Charge) to calculate and post credit and/or debit interest. For more information see the Action Guides ‘Clerical Calculation of Credit/Debit Interest’ (COM80084 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80084)) in section ‘How Interest is Calculated’.

16. If the original charge is incorrect and needs to be reduced complete AZ44 for authorisation to decrease the interest charge.

17. Once the AZ44 has been authorised by an Officer or above use function RMIC (Raise Manual Interest Charge) to amend the interest charge.

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Pursuit action where amounts unpaid

18. Where the liability remains unpaid 7 days after you have corrected the interest position:
- use function RAPP (Revise AP Pursuit) to amend the Pursuit Status to LA
- use function NOTE to record the clerical payment applications issued
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Dealing with an overpayment

19. Where the Accounting Period (AP) remains overpaid:
- telephone the CT Processing Office and ask them to deal with the overpayment
- use function LOPU (Overpayments Review List) to display the work list and B/F the entry to ensure the overpayment is cleared
- In HMRC Payments issue a completed form AOC714 to the CT Processing Office
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Straddling Accounting Period (AP) with Section 501A charge

20. Where the Reason for Listing field shows ‘Straddling AP with SS501A Charge’, the AP contains a supplementary charge on a ring fence trade;
- · you need to calculate the credit/debit interest manually
See subject ‘Clerical calculation of credit/debit interest’ (COM80080 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80080)) in section ‘How Interest Is Calculated'. Choose the appropriate HMRC Payments or Debt Management Action Guide (COM80084 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80084))

See also subject ‘Supplementary tax on North sea oil companies’ (COM80100 (https://www.gov.uk/hmrc-internal-manuals/cotax-manual/com80100)) in the same business area for further information on S501A and ring fence trades

To delete a case from the CDIW work list

21. Select the [Delete] button. The case will be deleted