COM81023 - Interest: interest work lists: credit interest work list (CDIW) - debt management (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 - 17 below. The guide is presented as follows

Step 1 Initial action (#IDACO5YB)

Step 2 Establishing why the case is on the work list (#IDAOP5YB)

Step 3 Checking the QP signal (#IDAXQ5YB)

Steps 4 - 9 Calculating a manual interest charge for a non QP case (#IDANR5YB)

Steps 10 - 13 Calculating a manual interest charge for a QP case (#IDAL05YB)

Step 14 Raising / Increasing a manual interest charge (#IDAZ55YB)

Steps 15 - 16 Reducing a manual interest charge (#IDAYAAZB)

Step 17 To delete a case from the CDIW work list (#IDA4BAZB)

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, then 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 work list.

Please note that: The reason shown will reflect why the case was originally put onto the work 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 QIP signal

3. Use function DAPD (Display AP Details) 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 QP case

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

5. If payments received on or after the normal due date (please see Glossary), credit interest is not due. Delete 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
- 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
- function DINT - Display Interest Computation
- 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’ in this business area

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

9. If a manual credit / debit interest charge is not appropriate go to step 17.

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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
- function DINT - Display Interest Computation
- 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’ in this business area

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 17.

Raising / Increasing a manual interest charge

14. To raise or increase a manual credit/debit interest charge use function RMIC (Raise Manual Interest Charge) to calculate and post credit and/or debit interest. For more information see section ‘How Interest is Calculated’ (COM80000 (http://home.stage.hmrci/commanual/COM80000.htm)).

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Reducing a manual interest charge

15. To reduce a manual credit/debit interest charge prepare form AZ63 for authorisation by an Officer or above.

16. Once form AZ63 has been authorised use function RMIC (Raise Manual Interest Charge) to reduce the interest charge.

To delete a case from the CDIW work list

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

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