About Wagecheck

Our Story

Wagecheck was built because understanding your take-home pay should not require a degree in accounting. Too many UK workers rely on rough estimates or outdated assumptions when making financial decisions — from accepting a job offer to planning a mortgage. We wanted to create a tool that is fast, accurate and genuinely free. No sign-ups, no paywalls, no hidden agendas. Just honest calculators that give you the numbers you need to make confident decisions about your money.

The project started with a simple salary calculator and grew into a comprehensive suite of 17 tools covering income tax, National Insurance, stamp duty, self-employment, sick pay and more. Every calculator runs entirely in your browser — your salary data never leaves your device.

How We Calculate

Transparency is central to everything we do. Every calculation on Wagecheck uses the exact same rules published by HMRC, Revenue Scotland and the Welsh Revenue Authority. We apply the correct income tax bands, National Insurance thresholds, pension auto-enrolment rules and student loan repayment plans for the current tax year. Where a calculator makes assumptions — for example, a 5% pension contribution or a specific tax code — we state those assumptions clearly on the page.

We do not round figures to make them look cleaner. The numbers you see are the actual calculated values, rounded only to the nearest pound where appropriate. If your payslip shows a slightly different figure, it is usually because your employer uses a different pay frequency or applies employer-specific deductions that our general-purpose calculator cannot account for.

Data Sources

All tax rates and thresholds on Wagecheck come from official UK government sources:

• GOV.UK — Income Tax rates and allowances
• GOV.UK — National Insurance rates
• GOV.UK — Stamp Duty Land Tax
• GOV.UK — Student loan repayment
• GOV.UK — National Minimum Wage rates
• GOV.UK — Understanding your tax code

Update Schedule

Wagecheck updates its calculators every April when the new tax year begins. This is when HMRC publishes updated income tax bands, National Insurance thresholds, student loan repayment thresholds and other rates. We review and apply all changes within the first week of the new tax year. Outside of the annual update, we correct any errors or misinterpretations as soon as they are identified. Each calculator page includes a change log so you can see exactly when rates were last updated.

Contact Us

Have a question, spotted an error, or want to suggest a new calculator? Get in touch at hello@wagecheck.co.uk. We aim to respond within 2 working days. For urgent tax questions, we recommend contacting HMRC directly or consulting a qualified accountant — we are a calculator tool, not a financial advisor.