How to Claim an R40 Tax Refund (Savings Interest Overpayment)
Form R40 is the catch-all HMRCHM Revenue & Customs — The UK tax authority. It collects income tax, issues National Insurance numbers, and runs Self Assessment.Click for official info ↗ repayment claim for people who do not file Self AssessmentUK Self Assessment tax return — The system for reporting income that is not taxed at source — self-employment, rent, foreign income — to HMRC by 31 January each year.Click for official info ↗. Use it for overtaxed bank interest. Use it for years when your income went down. Use it for tax wrongly deducted before you left the UK.
At a glance
- Cost:
- Free
- Total time:
- 30–60 minutes
- Steps:
- 6 steps
- Where to apply:
- gov.uk
Last reviewed October 2026 against official sources. Re-checked every 6 months · next review due April 2027.
The Steps
Follow these in order
Each card shows the phase, expected time, and any cost. Data checked against official UK sources(October 2026).
0 of 6 steps
- Before You Go 15 min
Check whether R40 is the right route
Use R40 when you overpaid tax but do not file Self Assessment. This is typically when banks deducted tax from interest when you were a non-taxpayer. Or when your income dropped mid-career. Or when you left the UK part-way through a tax year. R40 is only for UK residents. It is only for you if your gross savings/investment income is £10,000 or less. Your gross property income must be £10,000 or less. Your net property income must be £2,500 or less. Your foreign dividends must be within the dividend allowance. If you DO file Self Assessment, the overpayment is corrected on the return instead.
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- Before You Go 30 min
Identify the overpayment and the tax years
Ask banks for interest certificates for each year. Compare the tax taken. Banks used to deduct 20% automatically. Since 2016 most interest is paid gross and covered by allowances. Overtaxed interest is mostly an issue for earlier years or special products. You can claim for up to 4 tax years back.
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- Fill / Prepare 20 min/year
Complete one R40 per tax year
You need a separate form for each year you claim. The form asks for all income for the year. It asks for tax already paid. It asks for the repayment amount claimed. Claim online via gov.uk. You must post evidence of tax deducted from interest to HMRC (Pay As You Earn, BX9 1AS). Claims made on behalf of someone else must also be posted.
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- Submit & Pay 15 min
Post with supporting statements
Attach photocopies of interest certificates and P60s. Never send originals. Add anything else that shows tax deducted. Missing evidence is the main reason claims stall. Keep a copy of everything you send. Get free proof of postage.
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- Wait Varies
Wait for HMRC to process
R40 claims take longer than online claims. HMRC gives no fixed timescale. Check its reply-time guidance if your claim is delayed. HMRC may write to ask for clarification. Reply promptly with the requested figures.
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- Receive —
Get repaid, or fix the root cause
Repayment goes to your bank account. Or you can choose a cheque if you prefer. If you are still on the wrong tax code, file the registration forms. Do the same if banks are still deducting tax. This helps future years sort themselves. Reclaiming repeatedly is wasted effort.
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Be Careful
Don't make these mistakes
Filing an R40 when you file Self Assessment. Use R40 when you overpaid tax but do not file Self Assessment. If you do file Self Assessment, the overpayment is corrected on the return instead.
Filing an R40 after you have left the UK. R40 is for UK residents. If you live outside the UK, there is a different form. R40 can cover a part-year before you left, only while you were still UK-resident. The 4-year backdating still applies.
Filing one R40 for several tax years. You need a separate form for each year you claim. The form asks for all income for the year, tax already paid, and the repayment amount claimed.
Sending originals, or sending a claim with missing evidence. Attach photocopies of interest certificates and P60s. Never send originals. Missing evidence is the main reason claims stall. Keep a copy of everything you send. Get free proof of postage.
Missing the 4 year deadline. Four years from the end of the tax year in which the overpayment arose. For example, the 2022/23 year must be claimed by 5 April 2027. Treat 4 years as the hard limit.
FAQ
Frequently Asked Questions
Can I claim an R40 after leaving the UK?
No. R40 is for UK residents. If you live outside the UK, there is a different form. Use it to claim personal allowances and tax refunds from abroad. R40 can cover a part-year before you left. This is only while you were still UK-resident. HMRC can repay to an overseas bank account. Check the form's notes. The 4-year backdating still applies.
Why not just wait for HMRC to repay automatically?
Since the savings allowance regime, HMRC does repay many overpayments automatically through tax codes. But this only happens when it has the full picture. Foreign income can fall through the cracks. So can multiple interest sources and emigration scenarios. The R40 forces the reconciliation.
What is the deadline for an R40 claim?
Four years from the end of the tax year in which the overpayment arose. For example, the 2022/23 year must be claimed by 5 April 2027. Treat 4 years as the hard limit.
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