CT600 how to claim terminal loss relief

What is Terminal Loss Relief

Where a company has stopped trading and it has made a loss in its final 12 months of its trade the relief is extended as the company can carry back any trading losses that occur in the final 12 months of a trade and set them off against profits made in any or all of the three years up to the period when the loss was made providing:

How to claim terminal loss relief in the CT600

  1. Firstly, In the current period return , HMRC request that box 45 is ticked (claim or relief affecting an earlier period) In TaxCalc this can be found in HMRC Forms > page 1 or in SimpleStep > Finalising the return.
  2. The losses should be identified as being carried back in TaxCalc in:
    1. HMRC Forms mode :Go to CT600 Core > Computations > Losses, Management Expenses, NTLRDs and NTLIFA’s >Trading Losses > Insert the loss in the box for ‘‘Carried back against profits of a previous period’’
    2. SimpleStep mode: Go to CT600 Core > Losses, Management expenses, NTLRDs, NTLIFAs > Trading losses.  Insert the loss in the box for ‘‘Carried back against profits of a previous period’’. 

Our article: CT600 losses and how to carry them back to previous periods, provides more information on amending previous years returns and the temporary extended loss relief.



Article ID: 3185
Last updated: 10 Jul, 2025
Revision: 7
Tax Return Production -> CT600 how to claim terminal loss relief
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