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HMRC · Up to 4 years back

Find Out If You're Owed a Tax Refund

Most UK workers are owed money by HMRC at some point - and never claim it. Prooof checks your situation in minutes and shows you how to get it back.

What is a tax refund?

If you paid more income tax than you legally owed - through an emergency code, a job change, work expenses or a missed allowance - HMRC owes you a refund. You don't need an accountant: in most cases you can claim it yourself for free, and Prooof shows you exactly how.

Common reasons you may be owed

  • Emergency tax code (BR, 0T, W1/M1)
  • Changing jobs mid-tax-year
  • Working from home (£6/week allowance)
  • Uniform, tools or professional fees
  • Marriage Allowance never claimed
  • Stopped work or went on maternity leave

How Prooof helps

  1. 1

    Enter a few details

    Tell me about your job, code and expenses - no HMRC login required.

  2. 2

    Get an estimate

    I show how much you may be owed, broken down by year.

  3. 3

    Claim guidance

    Step-by-step instructions to file via your HMRC Personal Tax Account.

Check your tax refund in Prooof

Install Prooof and let it surface money you're owed automatically.

Frequently asked questions

How do I know if HMRC owes me a tax refund?▾

Common signs include a job change mid-year, working from home, an emergency tax code (BR, 0T, W1/M1), uniform or tool expenses, or marriage allowance you never claimed.

How far back can I claim?▾

You can claim a tax refund for the previous 4 tax years. After that, the entitlement expires.

How long does an HMRC refund take?▾

Online claims usually pay within 5–10 working days. Postal claims can take 8–12 weeks.

Is checking my refund free?▾

Yes - Prooof never charges to check what you might be owed. HMRC also processes valid refund claims for free directly through your Personal Tax Account.

Will checking affect my tax record?▾

No. Prooof only helps you understand your entitlement - nothing is filed unless you submit a claim yourself.