Free Practice Utility
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).
Drives the confirmation statement, and first accounts when ticked.
Statutory Due Dates for Period Ending 31 Mar 2026
Annual Statutory Accounts
31 Dec 2026
Subsequent accounts: 9 months after accounting reference date
Corporation Tax Payment
1 Jan 2027
9 months and 1 day after the accounting period ends. From a month-end year-end that is the 1st of the tenth month (30 June → 1 April). Due before the return.
CT600 Corporation Tax Return
31 Mar 2027
CT600 company tax return is due 12 months after the accounting period end
Confirmation Statement (CS01)
28 Jun 2027
Review period ends 14 Jun 2027, the day before the incorporation anniversary; file within 14 days. If a statement was filed early, count from its made-up-to date instead.
Managing compliance for 20+ UK clients?
FilingKeeper tracks all client deadlines automatically with automated 30, 14, 7, and 1-day reminders.
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: 9 months and 1 day after the accounting period end, or the 1st of the tenth month from a month-end year-end (30 June → 1 April). Due before the tax return.
• CT600 Return: 12 months after the accounting period end.