HMRC Self Assessment Online Demonstrator
Self Assessment Online is simple, secure and available 24 hours a day.
You can submit a tax return, amend it, view your account, pay your tax bill, ask a question and update your contact details using Self Assessment Online.
This demonstrator provides some typical pages from the free online HM Revenue & Customs (HMRC) Self Assessment service. There is also commercial software available to send your online tax return.
In this demo, you can see how to:
- tell us about you
- tailor your return, to get just the pages you need
- fill in your tax return, and see some examples
- check your return
- view your calculation
- submit your return
Using the demo
Click next at the bottom of this page to walk through the demo page by page. Or you can use the links on the left hand side of the screen to jump straight to the part of the tax return you're interested in.
Signing up for Self Assessment Online
If you’re newly self-employed, you can register for Self Assessment and sign-up for HMRC Online Services all at the same time.
If you're new to Self Assessment and need a tax return for another reason, you'll need to follow the steps below:
- 1. Register for Self Assessment. This involves providing HMRC with your personal details and a reason why you need a tax return.
- 2. HMRC will then set up records for you and send you a Unique Taxpayer Reference (UTR).
- 3. You can then sign up for HMRC Online Services using your UTR.
- 4. When you sign up, you'll see your User ID on screen. Make a note of it and keep it safe. It won't be sent to you. You will need it whenever you use HMRC Online Services. You also create your own password. HMRC will send you an Activation Code by post. You'll need this before you can start using the service.
- 5. You log in with your User ID and password and use the code to activate the service. You can then send your tax return online. You won't need the Activation Code again.
- 6. Keep your User ID, password and UTR safe. If you lose your User ID or your password, you'll need your UTR to recover them online.