Quick answer: UK salary after income tax and National Insurance, 2025/26 rules — £40,000 takes home about £32,320. Includes the £100k allowance taper nobody warns you about.
Income tax and employee National Insurance at 2025/26 rates, computed band by band with the personal allowance handled properly — including the £100,000 taper that quietly creates a ~60% effective band to £125,140. The default £40,000 salary takes home about £32,320 a year, £2,693 a month. A pension salary-sacrifice slider shows how contributions reduce both tax and NI, and the flag is upfront that Scotland's income tax bands differ.
About £32,320 for 2025/26 in England or Northern Ireland: £5,486 of income tax and £2,194 of National Insurance. That is £2,693 a month — an effective all-in rate of about 19%, while your marginal rate on the next pound is 28% (20% tax + 8% NI).
The personal allowance shrinks by £1 for every £2 above £100,000, disappearing at £125,140. Losing tax-free allowance while paying 40% makes each pound in that window effectively taxed around 60% — the most expensive band in the system, printed on no official rate card. Pension contributions that bring income back under £100,000 are the classic escape.
Sacrificed salary skips income tax and National Insurance entirely — a basic-rate employee saves 28p per £1 contributed, a higher-rate one 42p. The slider shows your take-home with the contribution out, so you can see the real cost of a pension pound is far below a pound.
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