File your accounts and Company Tax Return

Use this service to file your company or association’s:

  • Company Tax Return (CT600) for Corporation Tax with HM Revenue and Customs (HMRC)
  • accounts with Companies House
  • Company Tax Return and accounts at the same time if they’re for the same accounting period

The service will automatically convert your accounts to the required format (iXBRL).

This service will be closing in March 2026. You’ll need to use commercial software to file your Company Tax Return and accounts instead. Find out more about how to prepare for the closure.

If you’re a charity or unincorporated association

You should:

  • use this online service to file a tax return with HMRC
  • use filing software to file your accounts online with Companies House

If you’re a community interest company

You should:

There’s a different process if you need to file your confirmation statement (annual return) with Companies House.

File your accounts and tax return online

Use this service to file a tax return with HMRC and your accounts with Companies House.

Start now

Before you start

To use this service you’ll need your:

  • Company’s annual accounts - they must be ‘balanced’, so your total assets should match what you owe
  • Government Gateway user ID and password - if you do not have a user ID, you can create one when you first use this service
  • Companies House password and authentication code (if you’re filing your accounts at the same time) - you get these when you register with Companies House

Other ways to file

You can only use the paper form (CT600) if either:

  • you’re unable to file online because you have a reasonable excuse
  • you want to file in Welsh

You must also fill in and post form WT1 to explain why you’ve used the paper form.

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