Understanding your payslip UK — a plain English guide

Most people glance at the net pay figure on their payslip and move on. But your payslip contains a significant amount of information about your tax, National Insurance, and pension arrangements — and errors are more common than people realise.

The key components of a UK payslip

Gross pay is your total earnings before any deductions — your basic salary plus any overtime, commission, bonuses, or allowances.

Income tax is deducted through the PAYE system. The amount depends on your tax code. The standard tax code for most people with one employer and no unusual circumstances is 1257L, which gives you the full personal allowance of £12,570.

National Insurance contributions (NICs) are deducted at 8% on earnings between £12,570 and £50,270, and 2% above that. Unlike income tax, NICs fund specific benefits including the State Pension.

Pension contributions show both your employee contribution and, on some payslips, your employer's contribution. If your employer uses salary sacrifice for pension contributions, your gross pay shown may already be reduced by the pension amount.

Net pay is what actually goes into your bank account after all deductions.

Understanding your tax code

Your tax code is one of the most important things on your payslip. 1257L is the standard code. Letters mean different things — L means you get the standard personal allowance, M and N relate to the marriage allowance, K means you have untaxed income being collected through PAYE, and W1 or M1 indicates a non-cumulative code.

If your tax code is different from 1257L and you do not know why, contact HMRC to check. Incorrect tax codes result in either overpaying or underpaying tax — both of which need to be rectified.

Common payslip errors

Wrong tax code — affecting how much tax is deducted. Incorrect pension contributions — particularly if you have recently changed your contribution rate. Missing employer contributions — worth checking against your contract. Incorrect National Insurance category.

Bottom line

Spend five minutes checking your payslip each month. Verify your tax code, pension contributions, and net pay against your expectations. Catching an error early is far less complicated than resolving months of incorrect deductions.