What is a confirmation statement (CS01)?

By Ben Davies · Updated 26 September 2026

A confirmation statement (CS01) is a filing with Companies House that confirms your company's details are up to date. It replaced the old Annual Return in June 2016.

What it confirms

The confirmation statement checks that the following details on the Companies House register are correct:

• Registered office address
• Directors and secretaries
• Shareholders and share capital
• SIC (industry) codes
• People with significant control (PSC)

If anything has changed, you update it as part of the filing. If nothing has changed, you confirm the existing details.

How it differs from annual accounts

The confirmation statement and annual accounts are separate filings with different deadlines:

• Annual accounts: report the company's financial position. Due 9 months after your accounting reference date.
• Confirmation statement: confirms company details are correct. Due at least once every 12 months from incorporation (or the last CS01).

You need to file both, even if your company is dormant. If HMRC sends the company a notice to deliver a Company Tax Return, a CT600 to HMRC is also required.

Filing fee

The confirmation statement costs £50 (online) or £110 (paper), payable to Companies House. You pay it once per 12-month payment period, with the first statement you file in that period — any further statements in the same period are free.

Where DormantFile fits

We don't file the confirmation statement: you file it yourself with Companies House. We work out when it's due and remind you from 90 days out, on every plan including the free watchdog plan. The statement is also where existing directors give their identity verification code, so we read from the register which directors and PSCs still need to verify, and remind you before each one's date. What we file is the company's accounts (to Companies House) and nil CT600 (to HMRC) — see our pricing.

Read the full guide: First year filing for a new dormant company