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Exchange losses on a CT600: where a foreign exchange loss goes (box 795)

Last updated: 28 September 2026

Short version. A non-trading foreign exchange loss included in your accounts' Other charges can form a loan relationship debit. Enter the accounts amount in its source row, then identify it in Non-trading exchange losses in Step 2, Tax adjustments. The resulting non-trading deficit is shown in CT600 box 795 after credits are netted.

Go to the steps and entry details ↓

On this page
  • 1. Before you start
  • 2. Enter the figures
  • 3. Check both returns
  • Official sources

1. Before you start

Use these fields for exchange differences on balances you classify as non-trading. Prepare whole-pound loss and gain amounts already included in the accounts rows below. Interest receivable and Interest payable have their own treatment. Do not enter the same amount there as well.

Some exchange differences follow special rules, including differences on balances held for trade purposes. This is general guidance. Check the classification of your own balances before filing.

2. Enter the figures

  1. In Step 2, enter a loss in the accounts row Other charges. If the company has no trade, use Property income and expenses, then Other charges. If an older draft uses the net property entry, start a new submission with gross property figures.
  2. Enter a gain in the accounts row 205 Income not falling under any other heading.
  3. In Tax adjustments, enter the amount already included in the source row in Non-trading exchange losses or Non-trading exchange gains. Entering a gain here moves its tax treatment from CT600 box 205 to the non-trading loan relationship calculation, which can produce box 170.

For a long accounting period, SimpleCompanyTax#Simple CompanyTax divides each entered amount by days between the two Corporation Tax returns. An exchange difference recognised on one date can therefore appear in both returns. Review each return's computation before you authorise filing.

3. Check both returns

For a fictional company with £120 of qualifying exchange loss and no other non-trading loan relationship amounts, the computation shows a £120 debit and CT600 box 795 shows a £120 deficit. Relief in box 260 depends on the company's available profits. Confirm the accounts still show the original Other charges amount and that each return's preview agrees with its computation.

Read how foreign exchange gains and losses are treated for Corporation Tax for the distinction between trading and non-trading balances.

Official sources

  • HMRC CFM61120: giving effect to exchange differences
  • HMRC CTM01405: accounting period apportionment

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