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
End of corporation tax financial year.
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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