Are you sitting on a hidden tax refund?

The simplest method is through your personal tax account at gov.uk/personal-tax-account. Log in with your Government Gateway ID, select "Check your income tax," and review your coding notice. If you believe you have overpaid, you can submit a claim online. For employment expenses, use form P87 if below £2,500 or a self-assessment return if above. Most online claims are processed within 5-10 working days. Postal claims take 6-12 weeks.

Tax rebate companies charge 25-40% of your refund as a fee, sometimes more. HMRC's own service is free and processes the exact same claims. The only scenario where an agent adds genuine value is for complex multi-year claims involving multiple income sources or non-standard employment. For straightforward rebates involving emergency tax codes, uniform allowances, or working-from-home expenses, claiming directly via gov.uk costs nothing and takes around 15 minutes. Never pay a company that charges upfront fees rather than taking a percentage of the refund.

You can claim back tax overpaid in the last four tax years. For the 2025-26 tax year, you can claim back to 2021-22. Each April, the earliest claimable year closes permanently. HMRC cannot process claims older than four years, and this deadline cannot be extended regardless of circumstances. If you have been wearing a work uniform for five years and never claimed the flat-rate allowance, you lose the earliest year permanently each April. Claiming sooner preserves more of your entitlement.

The uniform tax rebate applies to any employee required to wear a recognisable uniform or specialist clothing for work, provided their employer does not launder it. HMRC sets flat-rate deductions by occupation: healthcare workers receive £125 per year, construction workers £120-140, police £100-140, and airline crew up to £1,022. The rebate is not the full flat-rate but the tax saved on it. At the basic 20% rate, a healthcare worker claiming £125 per year receives £25 annually, or £100 over four years. Higher-rate taxpayers save 40%.

Yes, if working from home is a requirement of your role rather than a personal choice. HMRC allows a flat-rate deduction of £6 per week (£312 per year) for additional household costs without requiring receipts. At the basic 20% rate, this saves approximately £62 per year. Higher-rate taxpayers save around £125 per year. Since 2022, the original pre-pandemic rule has applied: your employer must require you to work from home, not merely permit it. Claims made during the 2020-2022 pandemic years under the relaxed rules are not affected.

A P800 is a letter from HMRC sent after the end of the tax year when its records show you have paid too much or too little income tax through PAYE. HMRC calculates this by comparing the tax you paid against what your total income and allowances required. Common causes of P800 overpayments include starting a new job mid-year on an emergency tax code, having multiple employers with incorrectly split allowances, or receiving benefits that were over-estimated. If your P800 shows an overpayment, you can claim the refund online through your HMRC personal tax account. HMRC issues approximately 4 million P800 notices per year for overpayments.

PAYE spreads annual tax liability evenly across pay periods, but several common situations cause over-collection. Emergency tax codes apply when an employer does not receive a P45, typically taxing you as if your entire personal allowance has been used elsewhere. Mid-year job changes can split your personal allowance incorrectly between employers. Bonus payments in a single pay period can push that period into a higher bracket even when the annual total would not warrant it. Changes in company car or health insurance benefits take time to feed through to tax codes. HMRC's end-of-year P800 reconciliation corrects most of these, but expense claims require you to act proactively.

HMRC allows tax relief on expenses incurred "wholly, exclusively, and necessarily" in performing your duties, where your employer has not reimbursed you. Common categories include: uniform and specialist clothing maintenance by flat rate, professional body subscriptions required by your employer such as NMC nursing fees or engineering institution membership, tools and equipment purchased for work use, business mileage at 45p per mile for the first 10,000 miles if your employer pays less, and working-from-home expenses. You cannot claim for commuting, general work clothing such as suits, or meals at your normal workplace. Claims under £2,500 can be made by phone or through your personal tax account. Larger claims require a self-assessment return.

Self-employed people do not claim tax rebates in the same way as PAYE employees. Instead, they complete a Self Assessment tax return each year, and any overpayments are automatically reconciled. If your Self Assessment return shows you paid too much tax (for example, via payments on account that exceed the final liability), HMRC will process a refund after the return is filed and the liability confirmed. Self-employed people can claim all allowable business expenses to reduce their taxable profit, including home office costs, business mileage at approved rates, equipment, professional subscriptions, and training directly related to their trade. The equivalent of employment expense relief for self-employed people is built into Self Assessment rather than claimed separately. If you are both employed and self-employed, you complete Self Assessment and any employment expenses can be included there rather than through a P87.

HMRC processing times for tax rebates vary. For P800 notices (automatically generated overpayment notices), HMRC states that cheques are issued within 14 days of the notice, and bank transfers within 5 working days if you provide bank details through your Personal Tax Account. For proactively claimed employment expenses via P87, HMRC's target processing time is 8 weeks, though many straightforward claims are processed within 2-4 weeks. For Self Assessment overpayments, refunds are typically processed within 5 working days of the return being accepted and the repayment requested. During peak periods (April-June after the self-assessment deadline), processing times can extend. Checking your HMRC Personal Tax Account regularly is the most reliable way to track the status of any claim. If a claim has been outstanding for more than 8 weeks, HMRC's helpline (0300 200 3300) can provide a status update.