Last updated: 9 June 2026
By Stiv · Design, technology and personal finance
This article contains affiliate or referral links. If you click through and sign up I may earn a commission or referral bonus at no extra cost to you. It does not affect my editorial view.
If you're rushing to file a last minute tax return in the UK, you're far from alone. According to HMRC, 475,722 people filed on the very last day of the January 2026 deadline. Whether you've been putting it off, waiting on missing paperwork, or only just realised you need to file, this guide walks you through how to get your self assessment sorted quickly and avoid penalties that stack up fast.
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