Guide
UK Income Tax Explained for Payslips and Take-Home Pay
Most employees only need to know three things: personal allowance, tax bands, and whether the tax code is right.
Quick answer
If the code and tax year are right, PAYE usually works automatically; most problems come from the code or unusual pay timing.
What to check
- 1257L is the standard UK-style code for many employees.
- Scotland has different tax bands from the rest of the UK.
- Emergency tax and flat-rate codes can change deductions quickly.
What to do next
- Use a salary page or the calculator to see the tax effect on take-home pay.
- Use the checker if you want to compare with a real payslip.
- Read the tax-code guide if the code itself is the likely problem.
Try the tool
Use the checker if you already have a payslip. Use the calculator if you want to model take-home pay or salary-sacrifice changes before payday.