Official 2026 statutory schedule applied by the calculator above. Only income inside each band is taxed at that band’s rate.

Britain taxes you twice on the same payslip. Income tax takes 20%, 40% or 45% across progressive bands, while employee National Insurance takes 8% on earnings between £12,570 and £50,270 and 2% above — so a higher-rate taxpayer's true marginal bite is 42%, and an additional-rate taxpayer's is 47% before student-loan plan deductions (9% above threshold) enter. The tax-free Personal Allowance of £12,570 phases out at £1 per £2 earned above £100,000, creating a notorious 60%+ effective trap between £100,000 and £125,140 that every party promises — and few dare — to fix.

The frozen-threshold stealth tax: 2026 context

Allowances and thresholds have been frozen since 2021 and stay frozen until 2028, while wages grew roughly 20%+ cumulatively. The result is the largest fiscal-drag episode in modern British history: millions dragged from 0% into 20%, and from 20% into 40%, with zero votes cast. Any party promise must be read against this baseline — “no rate rises” still raises everyone's effective rate each year thresholds stand still. Our simulator models the freeze explicitly, so scenario deltas show genuine policy on top of the drag.

Labour vs. Conservatives vs. Reform UK vs. Liberal Democrats

Labour (in government) pledges no rises to headline income-tax, NICs or VAT rates, instead lifting revenue by freezing thresholds, tightening non-dom rules and targeting reliefs — good for headline stability, painful through drag. Conservatives promise to reverse course: cutting employee NICs further (they cut 4p in 2024), unfreezing allowances and lifting the personal allowance for pensioners (“triple lock plus”). Reform UK goes furthest — a £20,000 personal allowance and 40% entry far higher — worth hundreds monthly to middle earners but costed at tens of billions. Liberal Democrats emphasise allowances for low earners, a fairer capital-gains alignment and NHS-funded NIC stability. Run your salary through each: a £35,000 earner gains most from allowance rises, a £90,000 earner from threshold unfreezing.

Scotland, marriage allowance and student loans

Scotland sets its own bands (19–48% across six rates in 2026) — select it in the calculator for the correct schedule. The Marriage Allowance transfers £1,260 of unused allowance between partners (worth ~£252/year), and Plan 2 student loans add 9% above ~£27,295, often dwarfing party differences for graduates. Child Benefit claws back above £60,000 (High Income Charge), another threshold frozen into biting ever more families.

Worked example and verification

England, £45,000 gross, standard code 1257L, no student loan: income tax ≈ £6,500 (20% band only) + employee NICs ≈ £3,300 → net ≈ £35,200 (≈ £2,933/month). Cross-check with HMRC's income-tax calculator; match within pounds confirms the engine. Outputs are simulations illustrating policy direction, not personal advice — for filing, use HMRC or an accountant.

Nations compared: England, Scotland and Wales at £40,000 and £80,000

At £40,000, England and Wales pay identical income tax (~£5,500) + NICs (~£2,800) → net ≈ £31,700. Scotland's starter/intermediate bands (19–21%) shave ~£100–£200 off — near parity. At £80,000 the gap explodes: England ≈ £56,000 net while Scotland's 42% advanced rate and 48% top rate leave ≈ £54,300 — a £1,700 yearly price for devolution, before council-tax divergence. Party promises land differently per nation: personal-allowance rises help England most (bigger basic-rate population), threshold unfreezing helps Scotland most (denser higher-rate mass from fiscal drag). Welsh taxpayers follow England's bands but face distinct devolved spending. Select your nation in the calculator — cross-border workers, set it by tax residence, not office postcode.

Salary sacrifice, bonuses and student loans: the graduate's triple bind

Salary-sacrifice pension contributions cut income tax, NICs and student-loan repayments simultaneously — a £5,000 sacrifice saves a higher-rate graduate ~£2,000 tax + £100 NICs + £450 Plan 2 loan = ~£2,550, the highest instant return in British finance. Bonuses are taxed as ordinary pay (no flat rate), so a £10,000 bonus nets ~£5,300–£5,800 after 40% + 2% + 9% loan. Overtime at 42–47% marginal bites nearly half. Child Benefit (two children ≈ £2,000+/year) claws back 1% per £200 above £60,000 — a £65,000 earner loses a quarter of it silently. Enter loan plan and sacrifice above; party scenarios that lift loan thresholds or restore full allowances change graduate outcomes more than any headline rate.

Your pre-vote protocol: isolate the freeze, then judge the promise

Step one: compute your 2026 baseline and note your effective rate. Step two: re-run with thresholds indexed to 2021 in real terms (mentally add ~20% to bands) — the difference is what the freeze has already taken from you, typically £1,500–£3,000 yearly for middle earners. Step three: apply each party scenario on top and keep only promises that beat indexation, not ones that merely slow the freeze. A pledge worth £400 against a £2,000 freeze is a pay cut dressed as relief. Vote the net, not the noise.