Published: June 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 HMRC tax year. All calculations and tax rules have been audited against official UK legislation.
In the UK tax system, one of the most punitive tax rates is not explicitly written in any tax table. It is the “60% tax trap” that occurs when an individual’s adjusted net income falls between £100,000 and £125,140. For employees whose base salary is near or below the six-figure mark, a successful year capped off with a performance bonus can unexpectedly push them into this bracket. In this guide, we explain the mechanics of the £100,000 personal allowance taper, demonstrate how it creates a 60% marginal tax rate, and show how to use strategic planning to avoid it in the 2026/27 tax year.
What is the Personal Allowance Taper?
Every individual in the UK is entitled to a standard tax-free Personal Allowance of £12,570. However, under HMRC rules, once your adjusted net income exceeds £100,000, your Personal Allowance is reduced (tapered) by £1 for every £2 of income above this limit. This reduction continues until the allowance is completely reduced to zero. Because the allowance is fully tapered after £25,140 of excess income, the Personal Allowance is completely lost once income reaches £125,140.
How the 60% Tax Trap is Created
The combination of paying higher-rate tax and losing your tax-free allowance creates an effective marginal tax rate of 60% on income within the taper band. Here is the mathematical breakdown of how this happens on a £1,000 bonus received when your income is already £100,000:
- Higher-Rate Income Tax: The £1,000 bonus is taxed at the 40% higher rate, resulting in a direct tax of £400.
- Loss of Personal Allowance: Because your income increased by £1,000, your Personal Allowance is reduced by £500. This means £500 of income that was previously tax-free is now subject to the 40% tax rate, creating an additional £200 tax charge.
- Total Tax: The total Income Tax on the £1,000 bonus is £600 (£400 + £200), which represents an effective tax rate of 60%.
Once you include the 2% employee National Insurance Contribution, the total deduction rate on your bonus is 62%. If you also have student loan repayments (9%), the marginal deduction rate can reach an astonishing 71%!
Step-by-Step Calculation: Cash Bonus vs. Pension Avoidance
Let us look at a practical scenario for the 2026/27 tax year. An employee has a base salary of £95,000 and receives a £15,000 performance bonus, bringing their total annual income to £110,000. Let us compare taking the bonus as cash versus sacrificing the excess over £100,000 into a pension:
| Metric | Taking £15k Cash | Sacrificing £10k to Pension |
|---|---|---|
| Gross Income | £110,000 | £100,000 (after £10k sacrifice) |
| Personal Allowance | £7,570 (Tapered by £5,000) | £12,570 (Fully Restored) |
| Income Tax Paid | £31,770 | £27,432 |
| Employee NICs Paid | £4,660 | £4,460 |
| Net Take-Home Cash | £73,570 | £68,108 |
| Value Added to Pension | £0 | £10,000 |
| Total Financial Wealth | £73,570 | £78,108 (Cash + Pension) |
By sacrificing the £10,000 portion of the bonus that exceeds £100,000, the employee’s take-home pay only drops by £5,462, but their pension increases by £10,000. This represents an immediate tax saving of £4,538, proving the efficiency of keeping income below the threshold.
Additional Consequences of Exceeding £100,000
Crossing the £100,000 threshold also triggers other financial penalties in the UK:
- Tax-Free Childcare: If either parent’s adjusted net income exceeds £100,000, the household completely loses eligibility for Tax-Free Childcare (worth up to £2,000 per child annually).
- 30 Hours Free Childcare: Similarly, you lose the entitlement to 30 hours of free childcare for children aged 3 and 4.
- Self Assessment Requirement: Historically, all individuals earning over £100,000 had to file a Self Assessment tax return. While the threshold has been raised, high earners with complex benefits should monitor their status.
To see exactly how a bonus will impact your personal allowance and childcare benefits, use our Pay Rise Calculator or model your brackets with our Income Tax Calculator.
Frequently Asked Questions: 60% Tax Trap
1. What is the 60% tax trap on bonuses in the UK?
The 60% tax trap is the effective marginal tax rate you pay when your adjusted net income falls between £100,000 and £125,140 due to the tapering of your Personal Allowance. For every £2 of income you earn in this band, you lose £1 of your tax-free allowance, which is taxed at 40%.
2. How much bonus can push me into the 60% tax bracket?
Any bonus that pushes your total annual adjusted net income above £100,000 will subject the portion of the bonus above £100,000 to the 60% tax trap. This applies until your total income reaches £125,140, at which point your personal allowance is fully lost.
3. How does the personal allowance taper work?
The personal allowance taper reduces your tax-free allowance by £1 for every £2 your adjusted net income exceeds £100,000. Once your adjusted net income reaches £125,140, your standard £12,570 personal allowance is reduced to zero.
4. Can I use pension contributions to avoid the 60% tax trap?
Yes, making pension contributions is the most effective way to reduce your adjusted net income back down to £100,000. By sacrificing your bonus into a pension, you restore your personal allowance and secure 40% (or effectively 60%) tax relief.
5. What is adjusted net income?
Adjusted net income is your total taxable income from all sources (salary, bonus, interest, dividends) minus certain tax reliefs, such as gross pension contributions and gift aid donations. It is the figure HMRC uses to determine the tapering of your personal allowance.
6. Does the 60% tax trap affect child benefits?
No, the High Income Child Benefit Charge starts when your income exceeds £60,000 (for 2026/27), but earning over £100,000 leads to the complete loss of Tax-Free Childcare and 30 hours free childcare schemes. This can cost families thousands of pounds in addition to the Income Tax increase.
7. How is student loan repayment affected by the 60% tax trap?
Student loan repayments are calculated on total gross earnings above the threshold, so a bonus in the 60% band incurs an extra 9% deduction. This means your combined marginal deduction rate can be as high as 71% (60% tax + 2% NICs + 9% student loan).
8. Is the 60% tax rate official?
No, there is no official 60% tax band in UK legislation, but it is the practical result of the interaction between the 40% higher rate and the withdrawal of the personal allowance. It is widely recognized by tax advisors and financial planners as a critical tax trap.
9. Can I donate to charity to get out of the 60% tax trap?
Yes, making donations to charity under the Gift Aid scheme reduces your adjusted net income. Just like pension contributions, this can help bring your income back below the £100,000 threshold to protect your personal allowance.
10. Do I have to file a Self Assessment tax return if I earn over £100,000?
For the 2026/27 tax year, you are not automatically required to file a return solely for earning over £100,000 if your income is fully taxed through PAYE, but you must register if you have untaxed income or need to claim back relief. It is highly recommended to check HMRC’s latest tool to confirm your obligations.