When are private company accounts due at Companies House?

For first accounts covering more than 12 months, a private company normally uses the later of 21 months after incorporation or 3 months after the accounting reference date. If first accounts cover 12 months or less, and for later annual accounts, the normal period is 9 months after the accounting reference date.

When is Corporation Tax due?

Corporation Tax is usually payable 9 months and 1 day after the end of the accounting period, although large companies may pay by quarterly instalments.

UK Company Filing Deadline Calculator

Q: When is a CT600 Company Tax Return due?

A Company Tax Return is normally due 12 months after the end of the accounting period it covers.

Q: When is a confirmation statement due?

A confirmation statement must be filed at least once every 12 months. The review period normally ends 12 months after incorporation or the previous confirmation statement date, and the filing deadline is 14 days after the end of the review period.

Estimate key filing and payment dates for a UK private limited company, including Companies House accounts, Corporation Tax payment, CT600 filing and confirmation statement deadlines.

Important: This calculator provides general deadline guidance for UK private limited companies. Companies House and HMRC periods can differ. For long first accounts, enter one HMRC Corporation Tax accounting period end at a time; a second Tax Return and payment date may also be required. The tool does not cover every special case, including changed accounting reference dates, public companies, overseas companies, quarterly instalment payments, extensions or penalties.

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What this covers

Main UK company deadlines

For a UK private limited company, the most common annual compliance dates are the Companies House accounts filing deadline, Corporation Tax payment deadline, Company Tax Return deadline and confirmation statement deadline.

AccountsFirst accounts covering more than 12 months use the later of 21 months after incorporation or 3 months after the financial year end. First accounts of 12 months or less and later annual accounts normally use the 9-month rule.
Tax paymentCorporation Tax is usually due 9 months and 1 day after the accounting period ends, subject to rules for larger companies.
CT600The Company Tax Return is normally due 12 months after the end of the accounting period it covers.
ConfirmationThe confirmation statement is normally due 14 days after the end of the 12-month review period.

Tip: The directors remain responsible for filing on time even where an accountant or adviser prepares the submission. Use this tool for planning and confirm dates against the Companies House register and HMRC records before filing.

What next?

Use the dedicated Corporation Tax calculator for a clearer payment-versus-filing view, or get support with accounts and tax compliance.

Calculate Corporation Tax dates Explore accounts support Speak to an adviser

FAQs

UK company filing deadline frequently asked questions

Answers to common questions on company accounts, Corporation Tax, CT600 and confirmation statement deadlines.

When are first accounts due at Companies House?

If first accounts cover more than 12 months, a private company normally uses the later of 21 months after incorporation or 3 months after the accounting reference date. If they cover 12 months or less, the normal 9-month period applies. Changed accounting reference dates can create different deadlines.

When are later annual accounts due?

For a private limited company, annual accounts are generally due 9 months after the company financial year end.

When is Corporation Tax payment due?

Corporation Tax is usually payable 9 months and 1 day after the accounting period ends. Large companies may instead have quarterly instalment payment obligations.

When is the CT600 due?

The Company Tax Return is normally due 12 months after the end of the accounting period it covers.

When is a confirmation statement due?

A company must file at least one confirmation statement every 12 months. The review period normally ends 12 months after incorporation or the previous confirmation statement date, and the filing deadline is 14 days after the end of that review period.

Can Companies House accounts filing deadlines be extended?

Companies House may allow an extension in certain circumstances, but this should be applied for before the original filing deadline. This calculator assumes no extension has been granted.