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UK Statutory Filing Deadline Calculator

Enter your client's Accounting Reference Date (ARD) to compute exact statutory due dates for Companies House accounts, HMRC CT600 tax returns, and Corporation Tax payments.

The end date of the company's financial year (e.g. 31/03/2024).

Company Status
Subsequent accounting period (standard 9-month filing window).

Statutory Due Dates for Period Ending 31 Mar 2026

Companies House114 days left

Annual Statutory Accounts

31 Dec 2026

Subsequent accounts: 9 months after accounting reference date

HMRC115 days left

Corporation Tax Payment

1 Jan 2027

Corporation tax payment is due 9 months and 1 day after the accounting period end (due before the return!)

HMRC204 days left

CT600 Corporation Tax Return

31 Mar 2027

CT600 company tax return is due 12 months after the accounting period end

Companies House218 days left

Confirmation Statement (CS01)

14 Apr 2027

Confirmation statement is due 14 days after the end of the review period

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UK Statutory Timeline Rules (Companies Act 2006 & HMRC)

Companies House Annual Accounts

• Subsequent years: 9 months after the end of the financial year (Accounting Reference Date).
• First accounts: 21 months from the date of incorporation, or 3 months from the ARD (whichever is later).

HMRC Corporation Tax (CT600 & Payment)

• Tax Payment: Exactly 9 months and 1 day after the accounting period end (due before the tax return).
• CT600 Return: Exactly 12 months after the accounting period end.