We link every rate to its official source so you never have to take our word for it. Here is the complete gov.uk reference list, grouped by topic — useful whether you're checking our figures or researching UK tax yourself.
Everything on TruePay UK traces back to an official gov.uk page. If a figure ever looks out of date, these are the pages to check it against — and the ones we update from whenever rates change at the Budget.
Our methodology page walks through the exact order of the calculation and how each source feeds it.
Open the calculatorEvery formula and every source — plus an honest list of what we don't handle.
Read the guideEvery income tax band and threshold for 2025/26, in one clear reference.
Read the guideClass 1, 2 and 4 explained — rates, thresholds, and the State Pension link.
Read the guideThe band-by-band arithmetic, worked through step by step on a real salary.
Read the guideLast updated 6 July 2026. Figures are for the 2025/26 UK tax year.