Self-Assessment Registration Deadline 5 October: Act Now for 2025-26 Tax Year
Self-employed workers and landlords must register with HMRC by 5 October 2026 to file tax returns for the 2025-26 tax year. HMRC has launched a faster online service offering UTR within 72 hours.
Anyone who needs to complete a Self Assessment tax return for the first time must register with HM Revenue and Customs (HMRC) by 5 October 2026 to cover the 2025-26 tax year. This applies to self-employed sole traders earning more than £1,000 per year, landlords, partners in partnerships, and anyone receiving unreported taxable income.
Key Dates and Changes
- Registration deadline: 5 October 2026
- Tax return filing deadline (online): 31 January 2027
- Tax return filing deadline (paper): 31 October 2026
- New faster service: HMRC launched an improved online registration system in September 2026 that delivers your Unique Taxpayer Reference (UTR) within 72 hours
If you miss the 5 October deadline, HMRC will give you 3 months from the date of their letter to file your return, but your tax payment is still due by 31 January 2027. Missing this payment deadline triggers late-payment penalties.
For expat workers, remote self-employed contractors, and freelancers living abroad but earning UK income, this is a critical date. Register early to avoid penalties and ensure your UK tax record is clean. If you're unsure whether you need to register, use the free online tool on GOV.UK to check your circumstances.
Sources
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