UK payslip calculator and checker

How to check a payslip

1. Copy the gross pay, payment date, tax period number and tax code from the payslip you want to check.
2. Select the correct pay frequency. For cumulative PAYE after your first payment in the job, enter the taxable pay and Income Tax paid to date from your previous payslip.
3. Add pension and student-loan details if they apply, then compare the estimate with the deductions on your payslip.

Why your payslip may be different

Income Tax often changes because PAYE is cumulative: payroll considers earlier taxable pay and tax paid in the tax year. National Insurance is normally worked out for each payment period, so bonuses, irregular pay, and a different NI category can also change it. Pension schemes may use qualifying earnings rather than your full gross pay.

Use the discrepancy checker

After calculating, open “Compare with your actual payslip” and enter any deductions you want to check. The tool shows the difference and suggests the area to review. It cannot confirm a payroll error—ask your employer's payroll team or HMRC if you think your real payslip is incorrect.

Important limits

This estimate supports standard employee NI category A and selected tax codes for England, Wales and Northern Ireland in 2026/27. It does not yet cover bonuses, benefits, multiple jobs, K codes, Scottish or Welsh tax codes, attachment orders or employer-specific deductions.

See HMRC's guidance on employee Income Tax and employee National Insurance.