For those earning around £100,000, there's a little-known quirk in the system that can result in paying an effective tax rate of 60% on a portion of income. This phenomenon, often called the "60% tax trap," catches many high earners by surprise.
What Is the 60% Tax Trap?
The 60% tax trap isn't an official tax band. Rather, it's an unintended consequence of how the Personal Allowance reduction interacts with the 40% higher rate tax band. This creates an effective marginal tax rate of 60% on income between £100,000 and £125,140.
Here's the mathematical fact: for every £2 earned above £100,000, you lose £1 of your Personal Allowance. This means you're not only paying 40% tax on the additional income, but you're also paying an extra 40% tax on the Personal Allowance you've just lost. Combined, this creates a 60% effective tax rate on that slice of income.
Understanding the Personal Allowance
The Personal Allowance is the amount of income you can earn tax-free each year. For the 2025/26 tax year, this stands at £12,570 for most people. However, this allowance begins to reduce once your adjusted net income exceeds £100,000.
The reduction works on a simple formula: for every £2 of income above £100,000, your Personal Allowance decreases by £1. This continues until your Personal Allowance reaches zero, which happens at £125,140.
How the 60% Rate Actually Works
Let's break down the mathematics with a practical example:
If you earn £100,000, you receive the full Personal Allowance of £12,570. Your taxable income is therefore £87,430. Now, suppose you receive a £10,000 pay rise, bringing your total income to £110,000. Here's what happens:
Your Personal Allowance reduces by £5,000 (half of the £10,000 earned above £100,000).
Your new Personal Allowance becomes £7,570.
Your taxable income increases from £87,430 to £102,430.
The £10,000 increase in gross income results in a £15,000 increase in taxable income. At the 40% higher rate, you pay £6,000 in tax on this additional taxable income. This represents 60% of your £10,000 pay rise.
The Income Bands Where This Applies
The 60% effective tax rate applies specifically to income between:
- Lower threshold: £100,000 (where Personal Allowance reduction begins)
- Upper threshold: £125,140 (where Personal Allowance reaches zero)
Outside this range, standard tax rates apply. Below £100,000, you're typically paying 40% on income above £50,270 (the higher rate threshold). Above £125,140, you return to paying the standard 40% higher rate, or 45% if you earn over £125,140 (the additional rate threshold).
National Insurance Considerations
The effective tax rate can climb even higher when National Insurance contributions are factored in. For the 2025/26 tax year, employees pay 8% National Insurance on earnings between £12,570 and £50,270, then 2% on everything above that.
This means the true marginal rate in the £100,000 to £125,140 band is actually 62% (60% income tax plus 2% National Insurance).
Calculate My True Take-HomeWho Does This Affect?
This tax quirk impacts a specific group of earners. According to HMRC statistics, hundreds of thousands of taxpayers fall into this income bracket each year. This includes:
- VPs and directors
- Medical consultants and GPs
- Legal professionals and barristers
- Technology and finance professionals
- Business owners taking significant salaries
Common Scenarios That Trigger the Trap
Several situations can push earners into this bracket:
- Annual bonuses: A salary of £95,000 with a £10,000 bonus brings you directly into the trap zone.
- Promotional increases: Career progression that pushes base salary above £100,000 can result in unexpectedly high marginal tax rates on the increase.
Strategies People Consider
Understanding this tax quirk allows individuals to explore various approaches to tax planning.
Pension contributions
Making additional pension contributions can reduce adjusted net income. Pension contributions benefit from tax relief and reduce the income figure used to calculate Personal Allowance tapering.
Salary sacrifice arrangements
Some employers offer schemes where salary is exchanged for benefits such as additional pension contributions or cycle-to-work schemes. These arrangements can reduce gross income for tax purposes.
Calculating Your Take-Home Pay
Using a take-home pay calculator can help you understand exactly how much of your gross income you'll actually receive.
Looking Ahead
The 60% tax trap has been a feature of the UK tax system since 2010. Whether it will remain depends on future government policy decisions. Stay informed about any changes announced in the Budget.
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