Enter your gross salary and how much tax you've paid. We'll instantly calculate if HMRC owes you a refund — or if there's a balance to settle.
If HMRC calculates you've overpaid, they'll send a P800 tax calculation. You can claim online — refunds usually arrive within 5 working days.
If HMRC didn't receive your P45 from a previous employer, you're placed on an emergency code that taxes all your income — giving you zero Personal Allowance (£12,570) until corrected.
Tax-free allowances are spread equally over 12 months. If you join in, say, October, your employer may collect tax as if you'd earned more earlier in the year than you actually had.
Outdated benefit-in-kind data, old job records, or system errors can leave your tax code showing a lower allowance than you're entitled to — costing you money every payday.
Your Personal Allowance only applies once. If HMRC hasn't correctly split it between employers or pension providers, some income may be taxed more than it should be.
If you stopped working part-way through the tax year, you may have unused allowance. Tax already paid via PAYE in earlier months can't be reclaimed automatically — you must claim it.