How to Claim a Tax Refund UK: Step-by-Step Guide 2026
Millions of UK taxpayers overpay income tax every year. Here is exactly how to claim your tax refund from HMRC — whether you are employed, self-employed, or have left a job mid-year.
Key facts (2026): HMRC estimates that millions of UK taxpayers overpay income tax each year. You can claim back overpaid tax going back up to 4 tax years. Most employed workers can claim online via their Personal Tax Account. Self-employed workers claim through Self Assessment. HMRC pays refunds directly to your bank account, typically within 5 working days of approval.
Overpaying tax is more common than most people realise. It happens when you have the wrong tax code, leave a job mid-year, claim allowable expenses you did not deduct at source, or receive a taxable benefit that was wrongly calculated. The money belongs to you — HMRC will repay it, but you usually need to claim it.
Common Reasons for Overpaying Tax
The most frequent causes of overpaid income tax in the UK include: being put on an emergency tax code when starting a new job; leaving employment partway through the tax year without using your full personal allowance; having multiple jobs where your personal allowance is allocated incorrectly; overpayment on pension withdrawals (particularly first-time flexible access); and not claiming all allowable work expenses. In all of these situations, you may be owed a refund.
How to Claim a Tax Refund If You Are Employed (PAYE)
If you are employed and pay tax through PAYE, HMRC may automatically calculate and issue a refund at the end of the tax year via a P800 letter. If you receive a P800 showing you have overpaid, you can claim online within 45 days and receive your refund within 5 working days. If you have not received a P800 but believe you have overpaid, you can claim directly through your Personal Tax Account at gov.uk/personal-tax-account.
How Far Back Can You Claim?
Tax Year
Deadline to Claim Refund
2022–23
5 April 2027
2023–24
5 April 2028
2024–25
5 April 2029
2025–26
5 April 2030
Warning: Never use a third-party tax refund company unless you fully understand their fee structure. Many charge 25–45% of your refund as a fee. HMRC's own process is free and straightforward for most people.
Our Verdict
Claiming a tax refund from HMRC is straightforward and free. If you have overpaid in the last 4 years, start with your Personal Tax Account at gov.uk. The process takes minutes for most employed taxpayers and refunds arrive within days. Never pay a third party to do something you can do yourself for free.
Frequently Asked Questions
How do I claim a tax refund from HMRC?
Log into your Personal Tax Account at gov.uk/personal-tax-account. If HMRC has issued a P800 letter, follow the link in it. Self-employed taxpayers claim via their Self Assessment return.
How long does a tax refund take UK?
Once HMRC approves your claim, refunds are typically paid within 5 working days to your bank account, or up to 5 weeks by cheque if no bank details are held.
How far back can I claim a tax refund?
You can claim back overpaid tax for the last 4 complete tax years. Claims must be made before 5 April in the 4th year following the tax year in question.
Last updated: April 2026 · Author: Chandraketu Tripathi
The content on Kaeltripton.com is for informational and educational purposes only and does not constitute financial, investment, tax, legal or regulatory advice. Kaeltripton.com is not authorised or regulated by the Financial Conduct Authority (FCA) and is not a financial adviser, mortgage broker, insurance intermediary or investment firm. Nothing on this site should be construed as a personal recommendation. Rates, figures and product details are indicative only, subject to change without notice, and should always be verified directly with the relevant provider, HMRC, the FCA register, the Bank of England, Ofgem or other appropriate authority before any financial decision is made. Past performance is not a reliable indicator of future results. If you require regulated financial advice, please consult a qualified adviser authorised by the FCA.
CT
Chandraketu Tripathi
Finance Editor · Kaeltripton.com
Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.
House ad
Get your brand in front of KT readers
Featured Partner cards, KT Voices, the KT Weekly sponsor slot and Deals listings. Labelled placements only: editorial is never for sale.
