How to Claim a Tax Refund from HMRC in 2026

Millions of UK taxpayers are owed money by HMRC every year. Overpaid tax can arise from a new job that triggered an emergency tax code, a redundancy payment taxed at the wrong rate, pension contributions that weren't passed on to HMRC as relief, or simply a part-year employment where too much PAYE was deducted. The good news is that claiming back what you're owed is straightforward — but you do need to know which route to use and how far back you can go.

This guide covers every main refund route for 2026/27, the four-year backdating window, and the new digital tools HMRC has introduced to speed up the process.

Why You Might Be Owed a Tax Refund

HMRC processes over 60 million individual income tax records each year. Errors are inevitable. The most common reasons taxpayers are overpaid include:

• Emergency tax code applied by a new employer. If HMRC didn't have your previous employment details in time, your employer may have used a BR (basic rate on all income) or 0T (no allowances) code, deducting far too much.
• Multiple jobs in one tax year. Your personal allowance (£12,570 in 2026/27) is allocated to one job — income from a second job is taxed from £0.
• Leaving employment part-way through the year. PAYE calculates tax on the assumption you'll earn the same amount for the full 12 months. If you leave in August, you've been taxed as if you'd earn your August wage all year.
• Redundancy payment taxed incorrectly. The first £30,000 of a genuine redundancy payment is exempt from income tax and National Insurance. If your employer applied PAYE to the full amount, you may be owed a refund.
• Pension contributions made without tax relief at source. Some workplace pension schemes use the "net pay arrangement," where contributions are deducted before tax. If your income falls below the personal allowance and you're in a net pay scheme, you may have missed out on relief — a separate reclaim process exists for this.
• Stopping work to care for a child or family member. If you stopped working mid-year and your total income was below £12,570, you may have overpaid.
• High earner who made a pension contribution. Additional-rate taxpayers making personal pension contributions to a relief-at-source scheme only receive 20% relief automatically; the remaining 25% (taking relief from 20% to 45%) must be claimed.

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The Four-Year Backdating Rule

You can claim overpaid income tax going back four complete tax years. As of the 2026/27 tax year, this means you can claim back to 2022/23 (which ended 5 April 2023). Claims for 2021/22 and earlier are out of time.

Miss the window and the money is gone — HMRC will not exercise discretion except in very limited circumstances involving serious illness or incapacity. Set a reminder every April if you think you may have overpaid.

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Route 1: P800 — HMRC's Automatic Reconciliation

Each autumn, HMRC reconciles the previous tax year's PAYE records against returns and sends out P800 calculations to people who have underpaid or overpaid. If you overpaid, your P800 will say so and tell you how to get your refund.

If your P800 says you are owed money:

• You can claim your refund online via the HMRC personal tax account — you'll receive payment within 5 working days to your bank account.
• If you don't claim online within 45 days, HMRC will send a cheque automatically to your last known address.

If you haven't received a P800 but believe you've overpaid: Do not wait. Contact HMRC directly or file a formal repayment claim using the routes below. P800s are not sent to everyone — they only cover taxpayers whose records HMRC can fully reconcile through data matching.

Processing times for P800-triggered refunds have improved significantly following HMRC's digital investment: online claims now typically pay out within 5 working days. Cheques can take up to 3 weeks.

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Route 2: P87 — Employment Expenses

Form P87 is used by PAYE employees (not self-employed people) to claim tax relief on allowable employment expenses. Common P87 claims include:

• Working from home allowance. The flat-rate allowance is £6 per week (£312 per year) if your employer doesn't reimburse you and your duties require you to work from home. Higher amounts can be claimed with evidence.
• Uniform and tools. Flat-rate expenses exist for many occupations — a nurse can claim £125, a carpenter up to £140. Check HMRC's list of approved amounts.
• Mileage. If you use your own car for business travel (not commuting), you can claim 45p per mile for the first 10,000 miles and 25p per mile thereafter. If your employer pays less than these rates, you can claim the difference.
• Professional subscriptions. Annual fees for professional bodies on HMRC's approved list (the BMA, Law Society, RICS, etc.) are fully deductible.

How to submit: P87 can be submitted online via HMRC's Government Gateway if your claim is below £2,500. For larger claims, or claims that can't be made online, you post the completed form to HMRC's Pay As You Earn team. Claims over 12 months old must always be submitted in writing.

Processing time: Online P87 claims typically take 6 to 8 weeks. Postal claims can take up to 12 weeks, particularly in January and February when Self Assessment volumes are high.

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Route 3: R40 — Repayment of Tax on Savings Interest and PPI

Form R40 is used to reclaim tax deducted at source from bank interest or other investment income when your total income is below the tax threshold. This route is commonly used by:

• Pensioners or low earners whose total income (including interest) is below £12,570.
• Taxpayers who received PPI refunds with interest included. Courts determined that HMRC deducted tax incorrectly from some PPI payments, and R40 claims were the primary recovery route — though the window for most PPI-related R40 claims has now passed.

The R40 is a postal form, downloadable from GOV.UK. You submit a separate R40 for each tax year for which you're claiming. Processing takes up to 12 weeks.

Important: Basic-rate taxpayers with savings interest generally do not need form R40 because the Personal Savings Allowance (£1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers in 2026/27) means most interest is already received tax-free. R40 is primarily for non-taxpayers whose interest was taxed at source.

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Route 4: Self Assessment — The Cleanest Route for Complex Situations

If you already file a Self Assessment return, any overpaid tax is calculated automatically and shown on your return. You can ask for a repayment when you file, and HMRC will process it within 5 working days for online repayments to a UK bank account.

If you don't normally file Self Assessment but have a complex overpayment — for example, a redundancy payment that was taxed incorrectly, or a mixture of employment, pension and savings income — it can be worth registering to file a return for the relevant year. This gives you the most complete and auditable route to a refund.

Registering for Self Assessment for a past tax year:

• Register at GOV.UK for self-employment or "any other reason"
• HMRC will issue your UTR (Unique Taxpayer Reference) within 10 working days
• File the return by 31 January following the end of that tax year — or by 31 October for paper returns

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Route 5: Pension Tax Relief Claims

Relief at source schemes (most personal and SIPP pensions): Your pension provider claims 20% basic-rate relief automatically. If you're a higher-rate (40%) or additional-rate (45%) taxpayer, you must claim the additional relief via:

• Self Assessment (the simplest route if you already file), or
• Writing to HMRC with your pension provider's name, scheme reference, and the amount contributed.

Higher-rate taxpayers get an extra 20% relief (20% basic already received + 20% = 40% total). Additional-rate taxpayers get an extra 25%. On a £10,000 contribution, that's an extra £2,000 or £2,500 back.

Non-taxpayers in net pay schemes: If you earn below £12,570 and your employer uses a net pay arrangement (contributions deducted before tax), you may not have received basic-rate relief. The government introduced a top-up mechanism for this from April 2024 — HMRC pays eligible individuals directly. Check your pension provider's scheme type if your income is low.

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Route 6: Redundancy Overpayment Claims

The first £30,000 of a genuine redundancy payment is exempt from income tax (it was never subject to NI). If your employer deducted income tax from the full amount — either by mistake or because they classified part of the payment as payment in lieu of notice (PILON, which is taxable) — you may have a valid claim.

Steps:

1. Review your P45 or final payslip to see what tax was deducted and on what basis.
2. If tax was deducted from the exempt portion, write to HMRC's PAYE team with your employer's PAYE reference, the payment date, the total amount, and how it was categorised.
3. Include a copy of your settlement agreement or redundancy letter if available.

Processing times for written claims: 8 to 12 weeks.

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HMRC's Digital Tools in 2026

HMRC has significantly expanded its digital self-service capability. Via the Personal Tax Account (personal.tax.service.gov.uk), you can now:

• View your tax code and check it's correct for your circumstances.
• See your estimated income and tax for the current year.
• Claim a repayment directly once a P800 has been issued.
• Check the status of any submitted repayment claim.
• Update your bank details to ensure refunds go to the right account.

The HMRC app (available on iOS and Android) offers the same core functions and is often faster than the web portal. For P87 claims under £2,500, the online journey takes under 15 minutes.

Processing times in 2026:

• Online bank transfer after P800: 5 working days
• Online P87 claim: 6–8 weeks
• Postal P87 or R40: 8–12 weeks
• Self Assessment refund: 5 working days (online bank transfer)
• Written HMRC correspondence: 8–12 weeks (longer Jan–Feb)

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Practical Tips Before You Claim

Gather your documents first. You'll need P60s (annual income and tax summaries from employers), P45s (from previous employments in the same year), and payslips if your employer's records aren't complete. HMRC's records are usually reliable, but cross-checking avoids disputes.

Don't use a repayment agent unless you understand the fee. A cottage industry of "tax refund companies" charges 30–48% of your refund as a fee. They offer nothing you cannot do yourself online for free. HMRC's own guidance explicitly warns against these firms.

Check you have the right National Insurance number. All HMRC correspondence and claims must include your NI number — errors here will stall processing.

Keep a copy of everything you submit. If HMRC asks for clarification, having your own record of what you submitted and when is invaluable.

Use the take-home pay calculator to estimate your correct tax liability before filing a claim — this helps you verify whether HMRC's figures match what you'd expect based on your actual earnings.

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Summary: Which Route to Use

The maximum backdating window is four years. For 2026/27, the earliest year claimable is 2022/23. Don't wait — every year you delay, a prior year falls out of scope.

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This article contains general information about UK tax rules and is not personal financial or tax advice. Tax rules can change; verify current rates on GOV.UK or consult a qualified tax adviser for your specific circumstances.