To file a Self Assessment Tax return you must register for Self Assessment with HM Revenue & Customs (HMRC) and get your unique Taxpayer Reference (UTR). If you need to register, you must do it by 5 October following the end of the tax year (5 April) in which you earned taxable income that you need to report. If you’ve registered previously, you just need to sign in to your existing account.
Registering for Self Assessment
-
Register online with HMRC here.
- If you don't have one, you'll need to create a Government Gateway account. Follow the instructions on the website.
- Once your account is created and you're logged in, choose the option to register for Self Assessment.
- Follow the prompts and provide the necessary information (you'll need to give personal information including your National Insurance number and contact details, and information about your business).
- After completing the registration, HMRC will send you a letter containing your Unique Taxpayer Reference (UTR). This usually takes a few weeks.