Register for Self Assessment for any reason other than self-employment.
How you register for Self Assessment depends on your circumstances. Use form SA1 if you need to register but you’re not self-employed. For example, if you:
If you are using an older browser, eg Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.
You’ll need to fill in the form fully before you can print it. You can’t save a partly completed form so gather all your information together before you start to fill it in.
64-8: authorising your agent
Use form 64-8 to authorise HMRC to communicate with your tax representative about your tax affairs.
Don’t include personal or financial information like your National Insurance number or credit card details.