Clear explanations and practical calculators for PAYE, tax codes, National Insurance, employee reliefs and gross-to-net pay.
Last reviewed: September 2026.
Start with the question you need to answer. Every guide uses plain language, visible assumptions and links to relevant official guidance.
How to use these guides
Use the Salary Converter when you want to compare gross pay frequencies. Use the main salary calculator when you want an illustrative estimate after Income Tax, National Insurance and selected deductions. The tax-code and National Insurance guides explain the information that affects those calculations.