Company deadlines calculator.
Enter your year end and get the statutory dates: annual accounts filing, Corporation Tax payment and CT600 return, and the confirmation statement window — with the corresponding-date rule applied properly.
Accounts & Corporation Tax — from your year end
Enter your year end to see the dates. Public companies file accounts in 6 months, not 9 — this tool shows the private-company deadline.
Confirmation statement
Enter a date to see the 12-month review period and the 14-day filing window.
The dates, and why they surprise people
Three clocks run against every UK limited company, each from a different starting gun. Accounts run from the accounting reference date (your year end); Corporation Tax from the end of the accounting period (usually the same day); the confirmation statement from its own review period, which has nothing to do with your year end at all. The calculator keeps them separate because Companies House and HMRC do.
The maths itself is the Companies Act’s corresponding-date rule, which this tool applies exactly — including the clamp that catches month-end year ends (31 May + 9 months is the end of February, and the CT payment lands on 1 March). The official guidance is on gov.uk’s accounts pages and gov.uk on the confirmation statement.
Worth knowing
- A long first period means two Corporation Tax returns. A CT accounting period cannot exceed 12 months, so a company whose first accounts run 14 months files one set of accounts but two CT600s. The tool shows the dates for a 12-month period.
- Changing your year end changes the deadline. Shortening it gives you 9 months from the new date or 3 months from the notice, whichever is later — this tool assumes the year end you enter is settled.
- Missing them costs real money. Late accounts trigger the automatic Companies House penalty — see the late filing penalty calculator — and late CT collects interest from day one.
Quick answers
When are my company accounts due?
+
A private company files annual accounts 9 months after its accounting reference date. For a first accounting period longer than 12 months, the deadline is 21 months from the date of incorporation (or 3 months from the period end, if that is later). Public companies have 6 months.
Why isn't my deadline exactly '9 months later'?
+
The Companies Act uses the corresponding-date rule: the deadline is the same date 9 months on, and if that month has no such date it clamps to the month's last day. A 30 June year end is due 30 March — not 31 March — and a 31 May year end lands at the end of February.
When is Corporation Tax due?
+
Payment is due 9 months and 1 day after the end of the accounting period; the CT600 return is due 12 months after it. Note the payment comes before the return — a source of endless confusion.
When is my confirmation statement due?
+
Every company must file at least one confirmation statement every 12 months. The review period runs from incorporation (or the day after your last statement date), and the statement is due within 14 days of the period's end.
This calculator is general information for UK limited companies, not legal, tax, accounting or company secretarial advice. It runs entirely in your browser — nothing you type is sent to us or stored. Rates and rules change; check the linked official guidance and speak to your accountant about your own situation.
Never need this calculator again.
LtdRecord’s deadline radar watches these dates for your own company all year — and turns what happened into signed record packs your accountant can rely on. Your first pack is free, no card needed.
More free tools