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Free tool · UK limited companies

Companies House Deadline Calculator

Enter your accounting year-end and get every key deadline for your UK limited company — annual accounts, corporation tax, the CT600 return, and your confirmation statement — with a countdown to each.

The last day of your accounting period. You can find it on the Companies House register.

Add this to also calculate your next confirmation statement deadline.

The deadlines, explained

Every UK limited company has a handful of recurring filing deadlines, and they hang off two dates: your accounting year-end (your accounting reference date) and your confirmation statement review period. Miss them and the penalties are automatic.

Annual accounts are due at Companies House within 9 months of your year-end. Corporation tax is payable to HMRC 9 months and 1 day after the period ends, and the CT600 company tax return follows within 12 months. Your confirmation statement is due within 14 days of the end of your 12-month review period.

Key filing rules

Annual accounts
Private company (6 months for PLCs)
9 months after year-end
First accounts
For newly incorporated companies
21 months after incorporation
Corporation tax payment
Paid to HMRC
9 months + 1 day after year-end
Company tax return (CT600)
Filed with HMRC
12 months after year-end
Confirmation statement
At least once every 12 months
14 days after review period ends

Note for 2026: directors and PSCs must complete Companies House identity verification, with existing directors given until 18 November 2026 under transitional rules.

Common questions

When are my company accounts due?

A private limited company files annual accounts within 9 months of its accounting year-end (6 months for PLCs). A newly incorporated company’s first accounts are due 21 months after the incorporation date.

When is my confirmation statement due?

Within 14 days of the end of your 12-month review period, which runs from incorporation or your last statement. Every active company must file one yearly, even with no changes.

When do I pay corporation tax?

Corporation tax is due 9 months and 1 day after your accounting period ends. The CT600 return is filed within 12 months of the period ending.

What are the penalties for late accounts?

Automatic penalties from £150 to £1,500 for private companies, doubling if you file late two years in a row. Persistent failure risks strike-off.

Never miss a Companies House deadline again

AdminShield connects to Companies House, pulls your real deadlines, and reminds you before each one falls due — for your own company or every client you manage. Built for UK businesses, accountants and VAs.

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This calculator gives standard deadlines for a private limited company based on published Companies House and HMRC rules. First-year accounts, changed accounting reference dates and other circumstances can alter your dates. It is not a substitute for the official figures on the Companies House register or professional advice.