Self Assessment deadline incoming – 100 days to go

• The Self Assessment tax return deadline for 2025 to 2026 tax year is 31 January 2027.
• People can file their tax returns via GOV.UK and beat the January rush.
• Support and guidance are available on GOV.UK for those need it.

With 100 days to go until the deadline, HM Revenue and Customs (HMRC) is urging millions of Self Assessment customers to get ahead of the January rush and not put off completing their tax return for the 2025 to 2026 tax year.

Around 12 million people are expected to submit a tax return by 31 January 2027 and submitting tax returns early means customers can:

• find out how much tax they owe before the deadline
• give themselves more time to budget
• get a refund quicker if they have paid too much tax
• avoid penalties

Customers can complete and file their tax return for the 2025 to 2026 year on GOV.UK. If anyone is unsure about whether they need to complete Self Assessment, they can use the GOV.UK checker tool.

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

“The Self Assessment deadline is 100 days away so now is the ideal time to get ahead and file your tax return early.

“Guidance and support are available on GOV.UK to help you file your tax return. Just search ‘file my Self Assessment’ on GOV.UK to start yours today.”

People who are new to Self Assessment must first register to receive their Unique Taxpayer Reference, which they will need when they complete and file their return. And anyone who needs to tell HMRC that they no longer need to submit a tax return can do so on GOV.UK.

There is a range of support and guidance available on GOV.UK, including:

• help filling in the sections of your tax return
• videos explaining how to complete your tax return
• HMRC’s digital assistant which can answer common questions about Self Assessment

Self Assessment customers can also ask a tax agent, friend or family member, or a voluntary organisation to help them.

Those signed up to Making Tax Digital for Income Tax still need to submit their Self Assessment tax return in their usual way and pay any taxed owed by the 31 January 2027.

Self Assessment customers with a PAYE income can file online before 30 December and have any tax owed collected via their tax code.

Criminals often impersonate HMRC to steal money or personal information in someone else’s name. People should always take time to stop and think if the request is genuine before sharing personal information, never click on links in unexpected messages or share their HMRC sign-in details. Genuine HMRC contact details and advice on spotting scams can be found on GOV.UK by searching for ‘HMRC phishing and scams’.