Dates and Deadlines

Counting the days

Our comprehensive list of important dates and deadlines throughout the tax year can help you keep track of your returns.

With our online tax calendar, you will be able to stay on top of your essential filing dates with HMRC.

31 March 2023

  • Corporation tax

    End of corporation tax financial year.

  • CT61

    End of CT61 quarterly period.

  • Corporation tax return

    Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 March 2022 to be submitted to HMRC.

  • Company accounts filing deadline

    Deadline for filing your annual accounts is 9 months after your company’s financial year ends.

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