You can use the online service to:
- fill in and send your tax return to HM Revenue and Customs (HMRC)
- go back to a tax return you’ve already started
- check your details, view returns and print your tax calculation
If you’re filing online for the first time
Before you can sign in you must:
- have your Unique Taxpayer Reference (UTR) – you’ll find your UTR on the registration letter HMRC sent you
- enrol for the online service (you can do this when you create a Government Gateway account)
- activate the service using the code you’ll be sent in the post
Sign in using Government Gateway
You’ll need to enter the user ID and password you got when you signed up to the Self Assessment online service.
Sign in using GOV.UK Verify
You can also sign in with GOV.UK Verify. If you haven’t used GOV.UK Verify before, it will take you about 15 minutes to get set up. You can then use it to access other government services securely.
If you haven’t told HMRC you need to send a return
There are different ways to register for Self Assessment if you’re:
You should allow enough time to complete the registration process so you can send your return by the deadline.
When you can’t use the service
- for a partnership
- for a trust or estate
- if you lived abroad as a non-resident
- if you get income from a trust, you’re a Lloyd’s underwriter or a religious minister
This page is also available in Welsh (Cymraeg).