File your accounts and Company Tax Return
Use this service to file your company or association鈥檚:
- 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鈥檙e 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鈥檒l 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鈥檙e 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鈥檙e a community interest company
You should:
- use this online service to file a tax return with HMRC
- use the to file your accounts
There鈥檚 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.
Before you start
To use this service you鈥檒l need your:
- 颁辞尘辫补苍测鈥檚 annual accounts - they must be 鈥榖alanced鈥�, 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鈥檙e filing your accounts at the same time) - you get these when you
Other ways to file
You can only use the paper form (CT600) if either:
- you鈥檙e 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鈥檝e used the paper form.