UK Tax Calculators — Income Tax, NI, VAT & More

UK tax is one of the most layered systems in the developed world. Personal Income Tax operates with the £12,570 Personal Allowance, basic rate 20% to £50,270, higher rate 40% to £125,140, and additional rate 45% above. National Insurance adds another 8% main rate and 2% upper rate from the Primary Threshold. Pile on Scotland's six-band Income Tax (19% Starter to 48% Top), the 60% effective taper trap at £100,000, dividend tax at 8.75/33.75/39.35%, and Capital Gains Tax at 18% or 24% post-October 2024 — and you have a real maze. Our tax calculators cut through that complexity. Each tool uses the live 2025/26 HMRC rates pulled from a single source-of-truth file, so when April rolls around and rates change, every calculator updates atomically. We cross-check against the HMRC PAYE Tool where possible (take-home pay, income tax, NI, stamp duty, ISA, pension), and disclose tolerance + edge cases in the Methodology section. Beyond raw tax: this category covers Marriage Allowance (£252/yr saving + 4-year backdating up to ~£1,260), Gift Aid (25% basic-rate top-up plus higher-rate reclaim through Self Assessment), and specialist topics like Dividend Tax for Ltd company directors, P11D Benefits-in-Kind, Self-Employed Class 4 NI (6%/2%), Corporation Tax marginal relief between £50k-£250k profit, and the new R&D Merged Scheme tax credit at 20% (or 27% for ERIS-intensive SMEs). What you won't find here: K-prefix tax codes (we don't model the negative-allowance mechanic — those need bespoke handling), salary sacrifice schemes with student loan interaction below MTD threshold, foreign tax credits, or Court Order PAYE attachments. For those scenarios we link to qualified UK tax advisors via our Methodology + Sources page. Most users start with the Take-Home Pay calculator. From there: Income Tax for the band breakdown, Marriage Allowance to check eligibility, Stamp Duty for property purchases, and the new historical Income Tax + NI matrices (2023/24 vs 2024/25 vs 2025/26) for fiscal-drag analysis.