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ObligationUKReviewed October 2026
The corporation tax return a company files with the tax authority, reporting its taxable profit and the tax due. In the UK it is the CT600, filed with HMRC within twelve months of the accounting period end, while the tax itself falls due nine months and one day after that end.
It is separate from the Companies House accounts and runs on a different clock, so the tax is paid before the return that calculates it is even due. A company must file it even in a year when no tax is payable.
A definition of an established legal or tax concept for general information. It is not advice on any individual situation.
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