Changes and issues affecting the Corporation Tax online service
Find out how changes and issues may affect the way you should file your Company Tax Return.
Super-deductionService andissues
Annual 50%investment first-year allowancesallowance
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Last updated 6 April 2022 + show all updates
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The page has been updated with the latest changes and issues.
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First published.
Update history
2025-09-05 14:27
The ‘Audio-Visual Expenditure Credit (AVEC) and Video Games Expenditure Credit (VGEC)’ section has been updated to say there are other amounts that should be included in box 540 or 541.
2025-07-25 12:44
Information about new requirements for Company Tax computation format has been added.
2025-04-07 00:30
Added information about changes for first-year allowance for zero-emission cars and how to indicate you are claiming an exemption from the PAYE cap for certain Research and Development expenditure credit (RDEC) claims.
2025-03-28 11:45
Guidance for making a creative industry tax relief or credit claim has been updated.
2024-05-21 11:28
Added information for customers who are a Non-Resident Company claiming Small Profit Rate or Marginal Rate.
2024-04-16 11:49
Information about claims for creative industry tax reliefs and creative industry expenditure credits has been added.
2023-11-10 15:23
Information about using box 773 for the 50% first-year allowance has been updated.
2023-10-24 08:56
Information about issues affecting Research and Development expenditure credit (RDEC) claims has bee updated.
2023-08-24 15:59
Information added to explain what to do if you receive an error message when completing the additional information form relating to Research and Development expenditure credit (RDEC) claims.
2023-07-28 16:14
Information about how to report Electricity Generator Levy receipts and the amount of levy payable has been added.
2023-06-16 15:26
The issue about account submissions using the FRC Taxonomy with the ‘Highest Paid Director’ tag has been resolved.
2023-05-22 14:10
Information for completing CT600N Residential Property Developer Tax (RPDT) and claiming RPDT group relief for carried forward losses and full expensing and 50% first-year allowances, has been added.
2023-04-28 10:57
Information about an issue with account submissions made using the FRC Taxonomy with the ‘Highest Paid Director’ tag has been added.
2023-04-26 11:11
There are currently no service issues. The issues for: ‘companies claiming non-trading losses in respect of intangible fixed assets’, ‘research and development claims’ and ‘companies reporting an amount of brought forward step 2 restriction but not claiming any research and development expenditure credit in the current accounting period’ have been resolved.
2022-09-28 11:22
Information about loans to participators has been added.
2022-09-28 10:46
The page has been updated with the latest changes and issues.
2022-08-26 09:33
The page has been updated with the latest changes and issues.
2022-06-01 14:38
Information about Small and Medium Enterprise companies claiming Research and Development expenditure credit but not SME payable tax credit, Companies claiming Small and Medium Enterprise Payable Tax Credit and Companies claiming Research and Development expenditure credit and reporting an amount of brought forward step 2 restriction to be carried forward to the next accounting period has been added.
2022-04-06 00:15
The page has been updated with the latest changes and issues.
2022-03-04 14:54
First published.