Your tax return by 31 January

For anyone self-employed or on CIS in UK construction. Most CIS workers get money back — but only if they file.

days left to file online for 6 Apr 2025 – 5 Apr 2026

Deadline: 31 January 2027, online. File early — a refund comes sooner, and there's no late penalty to worry about.

How much will I get back? →

Do I need to file?

What to gather (tick as you go)

Step by step

    What you can claim (expenses)

    The full list of expenses →

    Late or scammed — avoid both

    © 2026 Graftum Ltd · UTR · CIS · Privacy
    General guidance for the 2025/26 tax year, checked October 2026 — not tax advice. Official rules: gov.uk/self-assessment-tax-returns.