Published: August 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 UK tax year. All calculations, tax bands, and payroll rules are audited against active HMRC manuals.
Disclaimer: This article on The 60% Tax Trap is for educational purposes only. Tax laws are subject to individual circumstances. Always consult a qualified accountant before making financial decisions.
What is the 60% Tax Trap?
One of the most punitive aspects of the UK tax system is the “60% tax trap,” which affects individuals earning between £100,000 and £125,140. While the official Higher Rate of income tax is 40% and the Additional Rate is 45%, the withdrawal of the Personal Allowance creates a hidden effective marginal tax rate of 60% (or 62% when factoring in National Insurance). You can simulate your exact take-home pay inside this bracket using our Income Tax Calculator or check historical bracket differences with the Compare Tax Years Calculator.
Under UK law, your tax-free Personal Allowance (£12,570 in 2026/27) is reduced by £1 for every £2 of “adjusted net income” you earn above £100,000. By the time your income reaches £125,140, your Personal Allowance has been completely reduced to zero. This means you are not only paying 40% tax on the income above £100,000, but you are also paying an additional 20% tax on the allowance you are losing.
Step-by-Step Mathematical Calculation
Let’s break down the math to prove why a £10,000 pay rise from £100,000 to £110,000 results in a 60% tax charge.
- Starting Income: £100,000. Personal Allowance is fully intact at £12,570.
- New Income: £110,000. This is £10,000 over the limit.
- Allowance Reduction: You lose £1 of allowance for every £2 over the limit. £10,000 / 2 = £5,000 lost allowance.
- New Personal Allowance: £12,570 – £5,000 = £7,570.
- Tax on the Pay Rise:
1. You pay 40% Higher Rate tax on the £10,000 pay rise itself: £10,000 * 40% = £4,000.
2. Because you lost £5,000 of tax-free allowance, that £5,000 is now taxed at 40%: £5,000 * 40% = £2,000. - Total Tax Cost: £4,000 + £2,000 = £6,000.
- Effective Marginal Rate: £6,000 tax on a £10,000 pay rise = 60%.
When you add the 2% Employee National Insurance rate, your total marginal deduction reaches 62%. In Scotland, where the Higher Rate is 42%, the effective marginal rate reaches 63% (or 65% with NI).
Avoiding the Trap with Pensions and Charity
The threshold is based on “Adjusted Net Income,” not gross salary. You can legally reduce your Adjusted Net Income by making gross pension contributions or by donating to charity via Gift Aid. For example, if you earn £110,000 and make a £10,000 gross contribution into a SIPP (Self-Invested Personal Pension), your Adjusted Net Income drops back to £100,000. This fully restores your £12,570 Personal Allowance. The £10,000 contribution effectively only costs you £4,000 out of pocket. Calculate your optimal pension contributions using our Pension Calculator.
Furthermore, crossing the £100,000 threshold also has a massive impact on child benefit allowances. Once a parent earns over £100k, they are taxed heavily or lose childcare benefits. You can calculate the exact impact of these reductions using our Child Benefit Calculator or see how to utilize salary sacrifice to stay below the limit with the Salary Sacrifice Calculator.
Frequently Asked Questions
Q: What is the 60% tax trap?
It is an effective marginal tax rate caused by the tapering of the £12,570 Personal Allowance for individuals earning between £100,000 and £125,140. You pay 40% tax on the earnings, plus another 20% effectively because you lose your tax-free allowance.
Q: How much allowance do I lose?
You lose £1 of your Personal Allowance for every £2 your adjusted net income exceeds £100,000.
Q: At what income is the allowance completely gone?
Once your adjusted net income reaches £125,140, your Personal Allowance is reduced to zero. You will be placed on a 0T tax code.
Q: What is Adjusted Net Income?
It is your total taxable income (salary, bonuses, rental income, dividends) minus specific tax-relievable deductions, such as gross pension contributions and Gift Aid charity donations.