United Kingdom · Updated for 2026/27 · monthly pay
UK payslip checker 2026/27
On £2,500 a month in 2026/27, with the standard 1257L tax code, your payslip should show £290.40 income tax and £116.16 National Insurance in England, Wales or Northern Ireland, leaving £2,093.44.
Type the figures from your own monthly payslip. We work out what each line should be and flag any that differ.
One month, code 1257L · England and Northern Ireland
Expected figures
Type the figures from your payslip to compare them line by line. Below is what we expect for £2,500 a month.
| Payslip | Expected | Difference | Result | |
|---|---|---|---|---|
| Income tax | – | £290.40 | – | Not entered |
| National Insurance | – | £116.16 | – | Not entered |
| Net pay (take-home) | – | £2,093.44 | – | Not entered |
We work out one month on its own, the way payroll does for steady pay. GOV.UK explains how to check if the tax on your payslip is correct.
How does the payslip checker work?
It works out one month the way payroll does when your pay is steady. Income tax: your pay, less a twelfth of the tax-free amount in your code, cut to the whole pound, then a twelfth of each tax band. National Insurance: 8% between £1,048 and £4,189 a month, and 2% above. Student loans: 9% (6% for a Postgraduate Loan) of pay over the monthly threshold, rounded down to the pound.
Real payslips add tax up over the year. So the first month after a pay rise, a new job or a new code can be different from our figure even when nothing is wrong. If the same line is off for several steady months, ask your payroll team.
Payslip questions
Why is my tax different from the checker?
Payroll works tax out over the whole year so far. If your pay changed, you started a new job, got a bonus or a new tax code, one month can be higher or lower than a steady month. Over the year it evens out.
How big a difference is normal?
Up to about £1 on any line is normal rounding: payroll software and the HMRC tables round in slightly different places. We only flag bigger differences.
What should I do if a line is wrong?
First ask your payroll team: most mistakes are a wrong tax code, NI category or student loan plan. If your tax code itself looks wrong, contact HMRC. GOV.UK has a guide to checking the tax on your payslip.
Does this work for weekly pay?
This checker is for monthly payslips. For weekly pay, use the calculator with your weekly pay: it shows the weekly figures.
Do you keep my payslip figures?
No. The checker runs in your browser and nothing you type leaves your device.