Improved Self Assessment registration service launched

HM Revenue and Customs (HMRC) has launched an improved registration service making it easier than ever to register for Self Assessment.

Anyone who is unsure if they need to submit a tax return can use HMRC’s free online checking tool on GOV.UK to understand what, if anything, they should do next. More than 640,000 customers registered for Self Assessment in the 12 months to 31 March 2026.

Those who need to file a Self Assessment tax return for the first time for 2025 to 2026 must register by 5 October 2026, or they could incur a penalty. They can register via GOV.UK.

The deadline for submitting a tax return and paying any tax owed for the 2025 to 2026 tax year is 31 January 2027. However, customers who have income to declare and aren’t already registered for Self Assessment need to do so before they can start their tax return.

Myrtle Lloyd, HMRC’s Chief Customer Officer, said:

Anyone new to Self Assessment may not realise they need to register before they can submit their tax return. Registering is quicker and easier than ever. And if you register now, you’ll get your Unique Taxpayer Reference so you can start completing your return with plenty of time before the 31 January deadline.

Improvements to HMRC’s online registration system means that those new to Self Assessment will be able to sign up quickly and easily through their Personal Tax Account using a more streamlined process including: