11 May 2026
Will a pay rise or bonus push you into a higher tax bracket?
Crossing an Income Tax band by itself won't reduce your after-tax pay, but hidden tax traps between £50,000 and £125,140, and cliff edges like Tax-Free Childcare, can catch people out. Here's how it actually works.
No, not from the PAYE mechanics alone. Moving into a higher tax band only affects the slice of income above the threshold, never your whole salary, so a pay rise or bonus itself will always leave you with more take-home pay through Income Tax and National Insurance than before. What it won't necessarily protect you from is a separate, income-linked cliff edge like losing Tax-Free Childcare, which can leave a household worse off overall even though the PAYE portion behaves exactly as described here. For the full mechanics of how tax bands stack, see our guide to how UK tax bands work.
How bonuses are actually taxed
A bonus isn't taxed at some special punitive rate. It's added to your normal pay and taxed through PAYE in whichever pay period you receive it. Because it's often a large lump sum landing in a single month, that month's payslip can apply a higher rate of tax withholding than usual, which is why a bonus can look brutally taxed. Over the tax year, PAYE reconciles this against your annual tax code, so you're not actually paying more overall than the bands say you should.
The real hidden tax traps
The genuine danger zones aren't the headline 40% or 45% bands, they're a couple of narrower income ranges where the effective marginal rate spikes well above the rate you'd expect:
- £100,000–£125,140: the Personal Allowance tapers away by £1 for every £2 of adjusted net income earned. In England, Wales, and Northern Ireland, that's on top of 40% Income Tax, producing an effective marginal rate of around 60%. Scottish taxpayers sit in the 45% advanced rate band across most of this range, so the same taper effect pushes their effective rate to around 67.5%, before National Insurance.
- £60,000–£80,000: if you or your partner claim Child Benefit and either of you has adjusted net income in this range, the High Income Child Benefit Charge claws back 1% of your Child Benefit for every £200 earned above £60,000, on top of your normal Income Tax, until it's fully withdrawn at £80,000.
A worked example: crossing into the higher rate band
Say your salary rises from £48,000 to £52,000, a £4,000 increase, and you're in England, Wales, or Northern Ireland. At £48,000, Income Tax is £7,086 (all taxed at the basic rate) and Class 1 National Insurance is £2,834.40. At £52,000, the first £37,700 of taxable income is still taxed at 20%, but the remaining £1,730 falls into the higher rate band at 40%, bringing Income Tax to £8,232; National Insurance rises to £3,050.60, since £1,730 of the increase falls above the Upper Earnings Limit and is charged at 2% instead of 8%.
That's an extra £1,146 in Income Tax and £216.20 in National Insurance, £1,362.20 in total, on a £4,000 rise. You keep £2,637.80 of it, around 65.9%, and you're still better off overall, even though part of the rise was taxed at 40% and part of your National Insurance dropped to only 2%.
Is it ever worth turning down a pay rise?
Rarely, but if you're heading into one of the tax trap zones above, or close to a cliff edge like the £100,000 Tax-Free Childcare threshold, it's worth knowing your options. Many people use pension salary sacrifice to bring their adjusted net income back under £100,000 or £60,000, since pension contributions reduce the income these thresholds are measured against. That's a genuine, common strategy, though whether it's right for you depends on your own circumstances and is worth discussing with a qualified adviser rather than treating as one-size-fits-all advice.
Our Salary Calculator shows the full Income Tax and National Insurance picture for any salary you enter. Try it at both your old and new figures to see the real difference, band by band.