UK income tax · PAYE FY 2026/27 LIVE
Model PAYE, Class 1 NI, salary sacrifice pensions, student loans and the 60% PA-taper trap against the locked HMRC 2026/27 ruleset. Recalculates client-side as you type — penny-accurate, no telemetry.
Engine note · Full PAYE band-walk in integer pence — no float drift across the £12,570 → £125,140 stack, no third-party scripts touch your figures.
Real-time PAYE, NI & pension modelling — recalculated client-side against the locked HMRC 2026/27 ruleset.
A fixed annual salary represents a contractual agreement for an aggregated gross sum, but its real-world execution through the UK's Pay As You Earn (PAYE) infrastructure is heavily dynamic. Rather than processing your earnings as a single annual entity, company payroll software slices your gross pay, tax allowances and insurance thresholds into exact monthly (1/12) or weekly (1/52) allocation blocks to calculate your net take-home pay.
Most salaried employees operate under a cumulative tax code (the standard 1257L for a full £12,570 Personal Allowance). Under a cumulative system, your payroll engine does not treat each month in isolation. Instead, it calculates your tax liability by looking at year-to-date earnings and comparing them against the proportion of allowances that have accumulated up to that point in the fiscal cycle.
By month 3 (June), for example, you are entitled to exactly 3/12ths of your annual Personal Allowance (£3,142.50) and 3/12ths of the Basic Rate band width. If you receive a mid-year bonus or a salary bump, the cumulative system automatically smooths the adjustment across the next payslip — spreading liabilities evenly across the remaining months rather than parking a single large bill at year end.
If your payslip carries a Week 1 / Month 1 marker (often an X or M1 suffix on the tax code), the engine is forced onto a non-cumulative basis. Each pay interval is then calculated completely in isolation, which can produce overpayments or underpayments whenever your monthly gross fluctuates.
When modelling a salaried income on this platform, high earners must navigate structural policy rules that drastically alter the net take-home trajectory:
When you configure retirement options inside the calculator panel, your choice of pension contribution base materially changes the final take-home figure:
The calculator core uses dedicated arrays to process regional deviations based on your location input. Workers in England, Wales and Northern Ireland share identical income tax thresholds, but residents in Scotland are subject to an independent six-band system managed by Holyrood. Because Scotland's higher-rate threshold sits well below the rest-of-UK boundary, salaried professionals there enter the 42% Scottish higher-rate band from £43,662 — long before the rest-UK £50,270 cliff — which is why location accuracy matters when auditing an employment contract.
Key thresholds locked in this build of the calculator.
Every £1 between £100k and £125,140 costs 62p in tax + NI because Personal Allowance tapers away. The escape is salary sacrifice — and the math is generous.
The PA taper at the Scottish Advanced Rate manufactures a 67.5% income-tax marginal — 7.5pp worse than rUK. Sacrifice math runs harder in your favour.
Three pipes that all deposit into the same pension. Only one saves you NI; only one gives higher-rate relief automatically.
Reverse-engineer the gross annual salary you need to support a £3,500-per-month lifestyle under the 2026/27 ruleset — including how the 42% Higher Rate cliff and student-loan deductions inflate the headline figure.