💰 Finance Calculators UK
UK finance calculators covering mortgages, tax, salary, savings and loans. Every figure is based on the actual UK tax and finance system — not a generic international template — so results reflect how mortgages, VAT, PAYE and statutory pay genuinely work here.
Money questions rarely have a single simple answer, which is exactly why a calculator built around real UK rules matters. A mortgage repayment isn't just principal divided by months — it depends on whether you're on a repayment or interest-only deal, and how compounding interest actually works over a 25-year term. VAT isn't a flat percentage you can eyeball — adding it and removing it from a price use different maths, and getting that backwards is one of the most common small business mistakes. Salary and redundancy calculations depend on UK-specific bands, thresholds and statutory formulas that change from one tax year to the next.
The finance calculators below are built to show their working, not just spit out a number. Each one is designed so you can see exactly how income tax, National Insurance, mortgage interest or compound growth was calculated — useful whether you're planning a house purchase, running payroll for a small business, or just working out what a pay rise actually means after tax.
From the blog: UK mortgage rates explained: fixed vs tracker vs variable · VAT for small businesses: a plain-English guide
All Finance calculators
Frequently asked questions
Are these UK finance calculators up to date with the current tax year?
The calculation logic follows current UK tax rules and bands. Because thresholds and rates are reviewed by HMRC and the government each tax year, always cross-check anything decision-critical against the latest official gov.uk figures before acting on it.
Can I use these instead of a financial adviser?
No — these tools are for general guidance and quick estimates, not personalised financial advice. For decisions like mortgages, pensions or redundancy, speak to a qualified adviser or your employer's HR/payroll team who can account for your full circumstances.
Why do my mortgage and salary numbers look slightly different from other calculators?
Small differences usually come down to rounding, whether a tool includes things like the mortgage arrangement fee, or which tax year's bands it's using. Our calculators show the underlying breakdown so you can see exactly which figures were used.