As of 28 September 2026, HMRC has issued a final reminder that the deadline for new Self-Assessment registrations for the 2025/26 tax year is 5 October 2026. Individuals who have newly become liable to tax (e.g., through self-employment, property income, or capital gains exceeding the annual exempt amount) must register online via the Government Gateway to receive a Unique Taxpayer Reference (UTR). Failure to register on time triggers automatic late-registration penalties, which escalate from £100 to daily penalties after three months, plus interest on any unpaid tax.
Key Takeaways
- Registration vs. Filing Deadlines: Registration (5 October 2026) is distinct from the online filing deadline (31 January 2027); both must be met to avoid separate penalty regimes.
- Agent Authorization Urgency: Tax agents should ensure Form 64-8 authorizations are submitted promptly, as HMRC processing times can exceed 15 working days during peak periods.
- Digital Compliance Push: HMRC is accelerating its Making Tax Digital for Income Tax Self-Assessment (MTD ITSA) mandate, with mandatory digital record-keeping and quarterly reporting phased in from April 2026 for incomes above £50,000.
Disclaimer: This article is compiled and summarized by the AI based on publicly available information and is for general information purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. Please consult a qualified professional tax advisor or legal counsel for tax advice.
Source: Read Official Announcement