What actually lands in your account
A UK salary passes through two separate deductions before it reaches you: income tax and National Insurance. They use different thresholds and different rates, which is why the total deduction never matches any single published percentage.
The two layers
Worked example: £60,000 gross
- Income tax: £11,432
- National Insurance: £3,211
- Take-home: £45,357, or £3,780 a month
- Effective rate: 24.4% — marginal rate: 40%
The gap between 24.4% and 40% is the single most misread pair of numbers in UK pay. The first is what you paid; the second is what happens to the next pound.
The bands
| Band | Income tax | National Insurance |
|---|---|---|
| Up to £12,570 | 0% | 0% |
| £12,570 – £50,270 | 20% | 8% |
| £50,270 – £125,140 | 40% | 2% |
| Above £125,140 | 45% | 2% |
Note what happens at £50,270: income tax doubles from 20% to 40% while National Insurance drops from 8% to 2%. The combined marginal rate moves from 28% to 42% — a jump, but a smaller one than the headline suggests.
The 60% trap between £100,000 and £125,140
The personal allowance is withdrawn by £1 for every £2 earned above £100,000. Each extra pound is taxed at 40% and also exposes 50p of previously tax-free income to 40% tax.
The effective marginal rate in that band is 60%, plus 2% National Insurance. Earning £110,000 leaves barely more after tax than £100,000, and a pension contribution that brings taxable income back under £100,000 is relieved at that same 60%.
Scotland is different
Scottish taxpayers have their own bands, with more of them and a higher top rate. National Insurance remains UK-wide, so the two systems interact differently north of the border.
Residency, not workplace, decides which applies.
What this calculator leaves out
Pension contributions, which reduce taxable pay and are the single most effective way to change the figure. Also student loan repayments — 9% above the plan threshold — salary sacrifice arrangements, and the High Income Child Benefit Charge above £60,000.
The pension contribution that pays for itself
At £60,000 the marginal rate is 40%, so a £1,000 pension contribution costs £600 of take-home pay and puts £1,000 into the pension. In the £100,000 to £125,140 band the same £1,000 costs roughly £400.
Nowhere else in the tax system is relief that generous, which is why higher-rate taxpayers who contribute nothing beyond the workplace minimum are usually leaving the largest single saving on the table.
Two people, same salary, different pay
Tax codes carry adjustments — untaxed benefits, underpayments carried forward, marriage allowance transfers — so two colleagues on £60,000 can take home noticeably different amounts.
The code on your payslip is the thing to check. 1257L is the standard code; anything else means HMRC is adjusting something, and the adjustment is often based on an estimate from a previous year rather than on this one.
Related calculators
- National Insurance calculator — the second deduction on its own
- Salary calculator — the same question for other countries
- Pay raise calculator — what a rise is worth after the marginal rate