High-income tax traps: the 60% band, the £100k trap and the pension fix

For higher earners, three bands of income are taxed far more harshly than the headline rates suggest. Between £100,000 and £125,140 the personal allowance is withdrawn at £1 for every £2, giving an effective 60% marginal rate (67.5% in Scotland). Between £60,000 and £80,000 the High Income Child Benefit Charge claws back Child Benefit. And the moment either parent’s income passes £100,000, Tax-Free Childcare and the funded hours are lost in full. All three are driven by one figure — adjusted net income — and all three are answered by the same lever: a pension contribution, which reduces that figure £1 for £1.

This pillar sets out each trap, the figures behind it, and how a contribution escapes it. The tax trap calculator solves for the contribution that gets a client to a chosen income, and the adjusted net income calculator works out the figure everything turns on. Figures are for 2026/27 and were verified unchanged from 2025/26.

The £100k trap: why income there is taxed at 60%

The personal allowance is £12,570. Once an individual’s adjusted net income passes £100,000, that allowance is withdrawn at £1 for every £2 above the threshold, reaching nil at £125,140 (£100,000 plus twice the £12,570 allowance). No tax rate creates the trap — the withdrawal does. Each extra £1 in the band is taxed at the 40% higher rate and drags 50p of previously tax-free allowance into tax at 40% as well. The effective marginal rate is 60%.

That is the steepest band a UK taxpayer meets short of Scotland. It is also the cleanest to plan around, because it is defined by adjusted net income rather than salary: a pension contribution that brings adjusted net income back to £100,000 restores the allowance in full. The mechanics, with the maths, are in the £100k / 60% tax trap, explained.

It is steeper in Scotland: 67.5%

The personal-allowance taper is set UK-wide and applies to Scottish taxpayers in full. What differs is the rate the recovered allowance is taxed at. Between £100,000 and £125,140 a Scottish taxpayer’s income falls in the 45% advanced rate. Each extra £1 of income is taxed at 45%, and the 50p of allowance it withdraws is taxed at 45% too — so £1 of income produces 67.5p of tax. Add the 2% employee National Insurance that applies above the upper earnings limit and the effective rate is roughly 69.5%.

Because the band is still defined by adjusted net income, the escape is identical: a contribution that brings income back to £100,000 restores the allowance, and in Scotland the relief in the band is worth 67.5p in the £1. The full reasoning is in the Scottish 67.5% tax trap, explained, and the tax trap calculator shows both with a residence toggle.

The child benefit charge: £60,000 to £80,000

A second trap sits lower down. Between £60,000 and £80,000 of adjusted net income, the High Income Child Benefit Charge claws back 1% of a household’s Child Benefit for every £200 of income above £60,000 — so the whole benefit is recovered by £80,000. For a family with children that adds a meaningful effective rate on top of the 40% higher rate across that band.

Child Benefit is £27.05 a week for the eldest child and £17.90 for each additional child, so the amount at stake rises with family size. A pension contribution that brings adjusted net income back below £80,000 reduces the charge proportionately, and a contribution back to £60,000 stops it entirely. The High Income Child Benefit Charge calculator quantifies the charge and the contribution that removes it.

The £100k childcare cliff

The third trap is the harshest in shape, because it is a cliff rather than a taper. If either parent’s adjusted net income exceeds £100,000, the family loses Tax-Free Childcare — worth up to £2,000 per child a year, or £4,000 for a disabled child — and the working-parent funded hours, in full and at once. There is no taper: £1 over £100,000 can cost the whole entitlement.

That makes the £100,000 threshold a double cliff — the personal-allowance trap and the childcare loss bite at the same point. For a family using childcare, the band just above £100,000 can be the most expensive money they earn, and a contribution that brings income back to £100,000 or below restores both the allowance and the childcare. The combined effect is worked through on the tax trap calculator.

The fix: a pension contribution cuts adjusted net income £1 for £1

Every trap above is defined by adjusted net income, which is total taxable income less grossed-up Gift Aid and grossed-up relief-at-source pension contributions. A gross pension contribution reduces that figure pound for pound, so the escape is mechanical: contribute enough to fall below a threshold and the allowance, the child benefit and the childcare come back, while the money still lands in the pension.

Take the worked case from the calculator: a £118,000 salary with two children. To bring adjusted net income from £118,000 to £100,000, the gross contribution needed is £18,000 — the difference between income and target. In the 60% band that £18,000 attracts relief at an effective 60%, so a £1 contribution can cost as little as 40p net; add the reclaimed childcare and child benefit and the contribution can more than pay for itself. The one thing to confirm is that the contribution fits within the pension annual allowance (PTM055100) plus carry-forward before acting.

Salary sacrifice: the NI-efficient route

A pension contribution can be made from your own bank account (relief-at-source or net-pay) or by salary sacrifice — agreeing a lower salary in exchange for an employer contribution. Both give the same income-tax relief and the same £1-for-£1 reduction in adjusted net income, so both escape the traps equally. Salary sacrifice does one extra thing: because the sacrificed pay is never received, it carries no National Insurance, so it also saves employee NI — 8% between £12,570 and £50,270, or 2% above £50,270 — and the employer’s 15% secondary NI saving can be added to the pension on top.

That makes salary sacrifice the more efficient route for an employee escaping a trap, where it is available. The mechanics are covered in what is salary sacrifice and salary sacrifice for pensions, explained; the NI saving most calculators miss is in salary sacrifice and National Insurance; how much you can actually sacrifice is in how much can you salary sacrifice into a pension; and the announced April-2029 cap on the NI relief is in salary sacrifice and the 2025 Budget. The salary sacrifice calculator runs the figures, including the Scottish bands.

Common questions

Working a real client position? Each calculator above produces a branded compliance-annex PDF with the full working and the HMRC references. For planning and illustration only; this guide does not constitute financial or tax advice.