UK PAYROLL
Payroll Mistake Checker.
Spot the most common UK payslip errors in 20 seconds. Our anomaly engine flags wrong tax codes, missing overtime, NI miscalculations, double pension deductions and more.
Educational estimates only. Not tax, legal, financial, payroll or employment advice. Verify with your employer's payroll team or HMRC.
Most common UK payslip errors
Wrong tax code
Emergency BR or 0T after a job change.
Missing overtime
Cut-off date or unapproved hours.
Wrong NI category
Charged at the wrong category letter.
Wrong student loan plan
Plan 1 fees on a Plan 2 borrower.
Double pension deduction
Auto-enrolment plus contractual contribution.
Sick pay or maternity wrong
SSP / SMP / SPP miscalculated.
Common questions
How do I report a payroll mistake to my employer?
Speak to your line manager or payroll department in writing. Reference the specific line on the payslip and attach a screenshot. Most employers correct mistakes in the next pay cycle. If they refuse, you can escalate to ACAS or, for tax-specific issues, contact HMRC on 0300 200 3300.
How long does an employer have to fix payroll errors?
There is no statutory deadline, but employers are expected to fix errors promptly, typically in the next pay run. If a mistake costs you tax or NI overpayments, HMRC adjusts those on the next reconciliation. Holding onto unpaid wages for more than a month without explanation may breach the Employment Rights Act 1996.
What if my employer does not respond?
Send a written complaint to HR or the employer's registered office. After 14 days without response, you can raise an Unauthorised Deduction from Wages claim through ACAS Early Conciliation, then potentially to an Employment Tribunal.
Can I claim back overpaid tax myself?
Yes, via your HMRC Personal Tax Account or by phone on 0300 200 3300. After the end of a tax year, HMRC will usually issue a P800 calculation automatically if you have overpaid through your employer.
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Open the toolPayslipIQ provides educational information and estimated calculations only. It does not provide tax, legal, financial, payroll, accounting, pension, benefits or employment advice. Always verify your payslip, tax code, deductions and take-home pay with your employer's payroll department, HMRC, your pension provider, a qualified accountant, tax adviser or another appropriately qualified professional.