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Corporation
Tax Deadline Checker

Enter your company details to calculate your exact deadlines.

Your key deadlines based on accounting period ending .

Filing deadline

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Payment deadline

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Companies House deadline

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Don't leave it to the last minute

MyIVA files your CT600 and company accounts in 3-5 days, for a fixed fee of £325 + VAT. No hidden charges, no stress.

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How UK deadlines are calculated

  • CT600 Filing: Due 12 months after the end of your accounting period. Filed with HMRC.
  • Corporation Tax Payment: Due 9 months and 1 day after the end of your accounting period. Paid to HMRC.
  • Companies House Filing: Due 9 months after period end for existing companies. First-time filers get 21 months from incorporation.