High-income tax traps: the 60% band, the £100k threshold and adjusted net income

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 Between £100,000 and £125,140 the personal allowance is withdrawn at £1 for every £2, giving an effective 60% marginal rate (67.5% in Scotland).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. Tax-Free Childcare and, in England, the working-parent funded-hours entitlement apply a £100,000 expected adjusted-net-income test to each parent. These rules all use adjusted net income, which some pension contributions reduce; actual benefit entitlement, contribution method and pension limits still need checking.

This pillar sets out each trap, the figures behind it, and how adjusted net income, and the things that reduce it, interact with each one. 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.

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 Once an individual’s adjusted net income passes £100,000, that allowance is withdrawn at £1 for every £2 above the threshold, reaching nil at £125,140 (£100,000 plus twice the £12,570 allowance).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%.

For most rest-of-UK taxpayers that is the steepest income-tax band. Scotland’s version is 67.5%, and a family with four or more children meets a steeper combined rate inside the £60,000–£80,000 Child Benefit charge band. 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 non-savings income (earnings, pensions, rental and trading profits) falls in the 45% advanced rate. Each extra £1 of that 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. Savings and dividend income stay on UK-wide rates. If the lost personal allowance would otherwise shelter non-savings income taxed at 45%, an extra £1 of taxable interest costs 62.5p and taxable dividends 58.25p in 2026/27. Other income mixes produce different effective rates. For employment earnings, adding the 2% employee National Insurance above the upper earnings limit takes the 67.5% income-tax rate to roughly 69.5%.

Because the band is still defined by adjusted net income, the mechanism 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 Scottish taxpayer option.

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: at 2026/27 rates about 47% with one child, 52% with two and 56% with three, and over 60% from four children (before National Insurance).

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. The tax trap calculator can then illustrate the additional gross contribution needed to reach a chosen ANI target, before allowing for existing contributions and other ANI adjustments.

The £100k childcare cliff

The third threshold is an eligibility cliff rather than a taper. A household does not qualify for Tax-Free Childcare if either parent expects adjusted net income above £100,000. The same test applies to England’s working-parent funded-hours entitlement. Tax-Free Childcare adds £2 for each £8 of eligible childcare spend, up to £2,000 per child a year (£4,000 for a disabled child); it is not a fixed annual payment. Funded-hours rules and value depend on the child’s age, UK nation, provider and entitlement period. England’s universal 15 hours for 3- and 4-year-olds are separate.

That makes the £100,000 threshold a double cliff — the personal-allowance trap and the childcare eligibility test bite at the same point. A qualifying pension contribution that brings expected adjusted net income to £100,000 or below can help the household satisfy the income condition, but it does not guarantee support: the other eligibility rules, timing and actual childcare spend still matter. The tax trap calculator shows a planning illustration, not a confirmed award.

How pension contributions affect adjusted net income

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 made under relief at source reduces that figure pound for pound. Net-pay and salary-sacrifice arrangements reduce taxable employment income instead. Lower ANI can restore personal allowance, reduce HICBC and help satisfy the childcare income test, but each result depends on the contribution method, existing ANI adjustments and the scheme’s other rules.

Take a simplified case: a £118,000 salary, no existing ANI deductions and a target adjusted net income of £100,000. A gross relief-at-source contribution of £18,000 would bridge that gap. In the rUK 60% taper band the income-tax effect can make a £1 contribution cost as little as 40p net. Any Child Benefit or childcare effect must be calculated separately from actual entitlement and spend. Pension input above the available pension annual allowance, after any carry-forward, may trigger a separate annual allowance charge (PTM051100). This is a tax-charge threshold, not a cap on the contribution itself.

Salary sacrifice and National Insurance

A pension contribution can be made from the member's own bank account (relief-at-source or net-pay) or by salary sacrifice — agreeing a lower salary in exchange for an employer contribution. Each route can reduce ANI, but the income-tax result is not universally identical: it depends on taxable income, income mix, contribution size and how the scheme gives relief. Salary sacrifice can also avoid employee NI on the sacrificed pay — 8% between £12,570 and £50,270, or 2% above £50,270 — and an employer may choose to add some or all of its 15% secondary-NI saving to the pension.

Where salary sacrifice is available, the employee NI saving is an additional difference between the routes, but minimum wage rules, salary-linked benefits, scheme terms and annual-allowance limits must all be checked. The mechanics are covered in what is salary sacrifice and salary sacrifice for pensions, explained; the NI saving a tax-only comparison leaves out 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 enacted April-2029 cap on the NI relief — with implementing regulations and payroll guidance still to come — is in salary sacrifice and the 2025 Budget. The reform leaves income-tax relief and genuine employer contributions outside salary sacrifice unchanged. The salary sacrifice calculator runs the figures, including the Scottish bands.

Common questions

Working a real client position? Use the calculators above for transparent planning illustrations and follow their source notes and warnings when recording the file. For planning and illustration only; this guide does not constitute financial or tax advice.