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Miss the 5 October notification deadline and you're not late for January's return yet — you're already in breach of a separate, earlier rule most new sole traders and landlords have never heard of.
Four days until HMRC expects half of next year's tax bill, calculated on last year's profits. Here's what actually happens if you can't pay it by 31 July.
New traders, landlords and side-income earners must register for self-assessment with HMRC by 5 October 2026.