What differences can mean
Differences can come from tax codes, payroll timing, bonus periods, statutory pay, taxable benefits, student loan notices or pension setup.
Payslip Checker UK
Compare payslip tax, NI and net pay with a broad estimate.
How to use the payslip checker
Copy the gross pay, tax, NI, pension and net pay lines from one payslip. The checker annualises the period, estimates Income Tax and NI, then converts the result back to the same payslip period.
Not a payroll audit
This is a broad estimate for spotting lines worth checking. It does not replace employer payroll records, HMRC notices or professional advice.
Source notes
Income Tax and National Insurance estimates use the bundled Clear Calculators UK tax data, checked against official guidance in June 2026.