How to Claim a Tax Refund on Savings Interest Using Form R40 UK 2026

Savings interest rates have been high by historical standards in recent years, and many UK savers have found themselves paying tax on interest they should never have been taxed on. If you are a non-taxpayer, a basic rate taxpayer who has used up your Personal Savings Allowance, or someone whose total income falls below certain thresholds, you may be entitled to a refund using HMRC Form R40.

Understanding the Personal Savings Allowance

The Personal Savings Allowance (PSA) lets most taxpayers receive some savings interest tax-free:

• Basic rate taxpayers: £1,000 of interest tax-free per year.
• Higher rate taxpayers: £500 of interest tax-free per year.
• Additional rate taxpayers (income above £125,140): £0 -- no allowance.

Interest paid by banks and building societies is paid gross (without deduction of tax). You are responsible for telling HMRC if the interest exceeds your PSA, either through Self Assessment or by HMRC adjusting your tax code.

But if your total income is low enough, you may be entitled to even more tax-free interest through the Starting Rate Band for Savings.

The Starting Rate Band for Savings: Up to £5,000 at 0%

This is one of the least-known reliefs in UK tax. If your non-savings income (wages, pension, self-employment) does not exceed the Personal Allowance of £12,570, you have access to a Starting Rate Band of up to £5,000 at 0% on savings income.

The band tapers. For every £1 your non-savings income exceeds the PA, you lose £1 of the £5,000 band. So:

• Non-savings income of £12,570 or less: full £5,000 starting rate band available.
• Non-savings income of £15,000: starting rate band reduced to £2,570 (£17,570 - £15,000).
• Non-savings income of £17,570 or more: starting rate band fully used up.

Combined with the £1,000 PSA, a basic rate taxpayer with non-savings income below the PA could receive up to £6,000 of savings interest completely tax-free.

Who Should Use Form R40?

Form R40 is for people who:

• Are not registered for Self Assessment.
• Have had tax deducted from income (such as annuity payments, certain PPI interest, or older savings products).
• Believe they have overpaid tax on savings income, pension income, or investment income.

Common scenarios:

• Retired on State Pension only (£12,547.60/yr): Your income is below the PA. Any savings interest is tax-free (PA + £5,000 starting rate band). If tax was deducted, claim it back.
• Part-time worker with modest salary: If non-savings income is between £12,570 and £17,570, part of the starting rate band is available.
• Non-taxpayer with annuity income: Some annuities have tax deducted at source. R40 recovers overpayments.

How to Complete and Submit Form R40

You can submit R40 online via your Government Gateway account (the fastest route) or download and post the paper form from gov.uk.

Step-by-step:

1. Gather your documents. You need your P60 (if employed or receiving a pension), bank statements showing gross interest received, and any tax deduction certificates.

2. Calculate your total income. Add up all income for the tax year: wages, state pension (£241.30/wk = £12,547.60/yr in 2026/27), private pension, bank interest.

3. Identify the tax deducted. Most savings interest is now paid gross, but some older accounts, PPI redress payments and certain NS&I products may have had tax withheld.

4. Complete form R40. Enter your total income, total tax already paid (PAYE, tax on savings), and the total allowances you are entitled to. HMRC calculates the refund.

5. Submit and wait. Online submissions are typically processed within a few weeks. Postal claims take longer.

Backdating: Up to 4 Tax Years

You can claim back overpaid tax for up to 4 tax years before the current one. In 2026/27, you can claim as far back as 2022/23. Each year requires a separate R40.

If you are a retiree who has had tax deducted from savings accounts over the past four years and your total income was below the relevant thresholds, the combined refund could be substantial.

Common Mistakes to Avoid

• Confusing R40 with R85. Form R85 was used to register a savings account for gross interest payments -- it has been replaced by the gross-payment default system. R40 is for reclaiming tax already deducted.
• Forgetting non-savings income. Your State Pension, occupational pension and any part-time wages all count as non-savings income and reduce your starting rate band.
• Missing the deadline. Claims must be made within 4 years of the end of the tax year. A 2022/23 claim must be submitted by 5 April 2027.
• Assuming ISA interest counts. ISA interest is always tax-free and does not interact with the PSA or R40 at all.

Should You Register for Self Assessment Instead?

If your savings interest regularly exceeds your PSA, HMRC may ask you to register for Self Assessment. R40 is a simpler one-off route for people without complex tax affairs. If your situation is complicated -- rental income, multiple income sources, self-employment -- Self Assessment is more appropriate.

For non-taxpayers and pensioners with straightforward finances, R40 is a simple, fast way to recover money that is rightfully yours.