# uk-paye
2025/26 UK income tax (England, Wales, Northern Ireland) and National Insurance
(Class 1 employee) — the core of a take-home calculation. Pure Rust, no deps.
Same figures behind the [UKMoneyCalc](https://ukmoneycalc.com/) calculator suite.
```rust
use uk_paye::take_home;
let (net, tax, ni) = take_home(50_000.0); // GBP gross
```
Figures: personal allowance £12,570 (tapered above £100,000), basic 20% to £50,270,
higher 40% to £125,140, additional 45% above. NI 8% between £12,570 and £50,270, 2% above.
Scotland and pre-tax deductions (pension, student loan) are out of scope here.
The £100,000 to £125,140 taper, not the 40% headline rate, is what makes the next
pound inside that window the most expensive one a UK employee earns. UKMoneyCalc
publishes the band-by-band scan of the effective marginal rate those same frozen
thresholds produce, income by income, on its
[marginal tax rate calculator](https://ukmoneycalc.com/calculators/marginal-tax-rate/) —
useful for sanity-checking `income_tax` and `national_insurance` against a second
implementation before trusting either.
License: MIT