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How do I carry back a loss to a previous financial year on a CT600?

Article ID: 828
Last updated: 27 Mar, 2019

HMRC claim that so long as box 45 (Claim or relief affecting an earlier period) is ticked on the current year return, you should not need to re-file the amendment for the earlier year. This being said, customers have previously reported that although this box is ticked, the repayment has not been issued and therefore an amendment of the earlier year was required to issue this. The below instructions should provide you with the information required to proceed.

For more information on timescales of filing amendments, please see the article for What tax years can I file online?

Current year return (2018 form)

HMRC Forms mode:

  1. Go to CT600 Core > Core > Page 1 > Tick box 45
  2. Go to CT600 Core > Computations > Losses, Management Expenses, NTLRDs and NTLIFAs > Trading losses > insert the loss in the box for "Carried back against profits of a previous period"

SimpleStep mode:

  1. Go to CT600 Core > Losses, Management Expenses, NTLRDs and NTLIFAs > Trading losses > insert the loss in the box for "Carried back against profits of a previous period"
  2. Go to Finalising the return and tick the box for "an earlier period?"

Once these entries are complete, you may then process the submission as required.

If you would like to process an amendment for the earlier year, please complete the below instructions. Please note, there are 2 options because of the different forms that are available for use (however the most common period ends will be the version 3 form).

Previous year

Return period starting on or after 01/04/2015

HMRC Forms mode

  1. Go to CT600 Core > Core > Page 1 > Tick box 40
  2. Go to CT600 Core > Core > Page 6 > Insert the corporation tax previously paid into box 595.
  3. Go to CT600 Core > Computations > Losses, Management Expenses, NTLRDs and NTLIFAs > Trading losses > insert the loss in the box for "Trading losses of a later accounting period utilised"
  4. Complete the additional boxes on CT600 Core > Page 10 and 11 , as applicable.
  5. If you want to add any notes (that would usually be covered in an additional information box), please go to Review Computation > Edit notes > select the location where you want to place the information and save this as required.
  6. Re-submit a full return for a refund of the difference in Corporation Tax – for instructions, read How do I resubmit a return or file an amended return?

SimpleStep mode

  1. Go to CT600 Core > Losses, Management Expenses, NTLRDs and NTLIFAs > Trading losses > insert the loss in the box for "Trading losses of a later accounting period utilised"
  2. Go to Tax reconciliation and insert the corporation tax previously paid into box 595.
  3. Go to Overpayments and repayments and complete this section, as applicable.
  4. Go to Finalising the return and tick the box for "this return period?"
  5. If you want to add any notes (that would usually be covered in an additional information box), please go to Review Computation > Edit notes > select the location where you want to place the information and save this as required.
  6. Re-submit a full return for a refund of the difference in Corporation Tax – for instructions, read How do I resubmit a return or file an amended return?

Return period starting before 01/04/2015

HMRC Forms mode

  1. Go to CT600 > Computations > Trading losses record
  2. Insert the loss figure into the box labelled "Trading losses of a later accounting period utilised"
  3. Go to CT600 Full/Short > Page 1 and tick the box for "A repayment is due for this return period"
  4. Then go to 
    1. Full > Page 5 > Complete box 91
    2. Short > Page 3 > Complete box 91
  5. Then go to
    1. Full > Page 8 and complete the necessary details
    2. Short > Page 4 and complelte the necessary details.
  6. Re-submit a full return for a refund of the difference in Corporation Tax – Please note, this will have to be done via a paper submission. 

SimpleStep mode

  1. Go to CT600 full/short > Trade and Professional Income > Trading Losses Record
  2. Insert the loss figure into the box labelled "Trading losses of a later accounting period utilised"
  3. Go to Tax reconciliation and insert the corporation tax previously paid into box 91.
  4. Go to Overpayments and repayments and complete this section, as applicable.
  5. Go to Finalising the return and tick the box for "this return period?"
  6. Re-submit a full return for a refund of the difference in Corporation Tax – Please note, this will have to be done via a paper submission. 
Article ID: 828
Last updated: 27 Mar, 2019
Revision: 6
Views: 18406
This article was:  


Also read
item How do I resubmit a return or file an amended return?
item What tax years can I file online?

Also listed in
folder Tax Return Production -> CT600 Corporation Tax Return