Answers · UK 2025/26
How do I check I have paid the correct UK tax?
Check your tax code on payslips. After April, HMRC issues P60 (employees), P800 letter (July-November) or Simple Assessment. Sign in to gov.uk/personal-tax-account anytime to view current position. Refunds can be claimed up to 4 tax years back.
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UK tax verification 2025/26. During year. Payslip tax code: check matches circumstances. YTD totals: should accumulate correctly. Personal Tax Account: gov.uk/personal-tax-account anytime. After tax year. P60: from employer by 31 May — full year summary. P800/Simple Assessment: HMRC reconciliation July-November. P45: when leaving a job. Self Assessment: by 31 January for self-employed, etc. Common errors: wrong tax code (biggest cause of overpayment); missing reliefs (Marriage Allowance, higher-rate pension relief, Gift Aid top-up); incorrect P11D values. Time limit to claim refund: 4 years from end of tax year (2021/22 reclaimable until 5 April 2026). HMRC contact: 0300 200 3300 or Personal Tax Account "Tell HMRC about a change".
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.