The 60% Income Trap: Why Earning Between £100k–£125k Costs You More Than You Think

Getting a pay rise past £100,000 should feel good. But thanks to an oddity in the UK tax system, every extra pound you earn between £100,000 and £125,140 is effectively taxed at 60% — higher than someone on a £500,000 salary.

This isn't a quirk that HMRC shouts about. It catches thousands of higher earners off guard each year, and it's entirely avoidable if you know what you're doing.

How the £100k Tax Trap Works

The UK personal allowance for 2025/26 is £12,570 — the amount you can earn before paying any income tax. Most people get this in full.

But once your income exceeds £100,000, you start losing it. For every £2 you earn above £100,000, your personal allowance is reduced by £1. By the time you reach £125,140, it's gone entirely.

Here's where the maths gets painful. In the £100,000–£125,140 band, you're paying:

• 40% income tax on the income itself (higher rate)
• Plus effectively another 20% because the allowance you're losing means £1 of previously tax-free income is now taxed at 40% for every £2 you earn

That gives you a combined effective marginal tax rate of 60%.

And if you factor in National Insurance at 2% (the rate above £50,270 in 2026/27), you're actually losing 62p of every extra pound.

A Concrete Example

Let's say you earn £100,000 and your employer offers you a £10,000 raise to £110,000.

Here's what actually happens to that £10,000:

Deduction	Amount	How
Income tax (40%)	£4,000	Higher rate on the £10k
Lost personal allowance tax	£2,000	You lose £5,000 of allowance → taxed at 40% = £2,000 extra
National Insurance (2%)	£200	Employee NI above upper earnings limit
Total deductions	£6,200
Take-home from the raise	£3,800	38% of the raise

You worked for a £10,000 raise. You kept £3,800. The Treasury kept £6,200.

Compare that with someone on £80,000 getting the same raise to £90,000. They'd keep roughly £5,800 of it — over £2,000 more than you, despite earning less.

Who's Affected?

Anyone with adjusted net income between £100,000 and £125,140. This includes:

• Base salary in this range
• Salary plus bonuses that push you over £100,000
• Salary plus taxable benefits in kind (company car, private medical insurance)
• Rental income, dividends, or freelance earnings on top of employment income

It's not just about your payslip. If your total taxable income crosses £100,000 from any source, the trap kicks in.

The Cliff Edge Effect

This trap creates some genuinely bizarre situations. Someone earning £99,999 takes home more than someone earning £100,001 after you account for lost personal allowance. That's not an exaggeration — it's basic maths.

In fact, to match the take-home pay of someone on £100,000, you'd need to earn approximately £100,100 — because the first £100 over the threshold costs you about £62 in tax and NI, while gaining you back roughly £62 in gross pay.

The truly painful zone is the middle of the band. At £112,570 (halfway), you've lost half your personal allowance, and every pound in this band is still being taxed at 60%.

How to Beat the 60% Trap

The key concept is adjusted net income. If you can reduce this figure to £100,000 or below, your full personal allowance is restored. There are several legitimate ways to do this.

1. Pension Contributions (The Most Powerful Tool)

Pension contributions reduce your adjusted net income. This is by far the most effective way to beat the trap, because the tax savings are extraordinary.

Example: Salary sacrifice into your pension

You earn £120,000. Your personal allowance has been reduced to just £2,570 (you've lost £10,000 of it).

You arrange salary sacrifice of £20,000 into your pension. Your adjusted net income drops to £100,000, and your full £12,570 personal allowance is restored.

The true cost of that £20,000 pension contribution:

Component	Value
Pension contribution	£20,000
Income tax saved (40%)	-£8,000
Personal allowance restored (£10,000 × 40%)	-£4,000
NI saved (salary sacrifice: 8% employee + 13.8% employer)	-£1,600 (employee)
Effective cost to you	£6,400

You put £20,000 into your pension. It cost you £6,400 in lost take-home pay. That's an immediate 213% return before any investment growth.

Even a personal pension contribution (not salary sacrifice) is excellent here. You'd get the income tax savings and personal allowance restoration, though you'd miss out on the NI savings.

Use the PoundSense pension calculator to model exactly how salary sacrifice affects your take-home pay and retirement projection.

2. Gift Aid Donations

Charitable donations made under Gift Aid also reduce your adjusted net income. If you're already donating to charity, make sure you're doing it through Gift Aid — it won't change your donation amount, but it will reduce your taxable income.

However, you'd need £25,140 in Gift Aid donations to fully escape the trap, which is only practical for genuinely philanthropic high earners.

3. Trading Losses

If you have self-employment losses, these can offset your adjusted net income. This is niche, but relevant for people who run a side business alongside employment.

4. Timing Your Income

If your income fluctuates — say, through bonuses or freelance work — you may be able to time when income is received to avoid crossing the £100,000 threshold in a given tax year. This is more relevant for directors who control their own salary and dividend mix.

Salary Sacrifice vs Personal Pension: Which Saves More?

Both work to reduce your adjusted net income, but salary sacrifice is the clear winner in this income band.

Method	Income tax saved	NI saved	Personal allowance restored
Salary sacrifice	✅ 40%	✅ Employee (8%) + employer (13.8%)	✅ Yes
Personal pension (relief at source)	✅ 40%	❌ No	✅ Yes
Personal pension (net pay)	✅ 40%	❌ No	✅ Yes

With salary sacrifice, both you and your employer save National Insurance. Many employers will pass on some or all of their NI saving as an additional pension contribution, making the deal even sweeter.

If your employer offers salary sacrifice, use it. If they don't, ask — it saves them money too.

The Numbers in Practice

Let's walk through three scenarios for someone on £125,140 (the point where your personal allowance has completely gone).

Scenario A: Do Nothing

• Adjusted net income: £125,140
• Personal allowance: £0
• Income tax: approximately £38,560
• Employee NI: approximately £6,100
• Take-home: ~£80,480

Scenario B: Salary Sacrifice £25,140 Into Pension

• Adjusted net income: £100,000
• Personal allowance: £12,570 (fully restored)
• Pension contribution: £25,140
• Income tax: approximately £23,460 (saving £15,100)
• Employee NI: approximately £4,089 (saving £2,011)
• Take-home: ~£72,451
• Total in your pocket (take-home + pension): ~£97,591

You've "lost" £8,029 in take-home pay, but gained £25,140 in your pension. That's a pension contribution that effectively cost you 32p per pound.

Scenario C: Salary Sacrifice £25,140, Employer Shares NI Saving

If your employer passes on their 13.8% NI saving (£3,469) as extra pension:

• Everything from Scenario B, plus
• Pension pot gains: £28,609 instead of £25,140
• Effective cost per pound in pension: 28p

This is why financial advisers call this income band the "sweet spot" for pension contributions.

What About Income Above £125,140?

Once you're past £125,140, your personal allowance is already gone. The marginal tax rate drops back to the standard 40% (plus 2% NI). There's no extra penalty.

This means the 60% trap is a specific, bounded problem — it only applies in the £25,140 band between £100,000 and £125,140. If you earn well above this range and can't sacrifice enough to get below £100,000, focus on other tax-efficient strategies (maximising pension contributions up to the £60,000 annual allowance, ISAs, VCTs/EIS for the adventurous).

Don't Forget the Annual Allowance

The pension annual allowance for 2025/26 is £60,000. That's the combined maximum from you and your employer. So sacrificing £25,140 to escape the trap is well within limits for most people.

However, if you earn over £260,000 (adjusted income), your annual allowance starts tapering down — potentially to just £10,000. This is the tapered annual allowance, and it's worth checking if you're in that bracket.

You can also carry forward unused allowance from the previous three tax years, which can be useful if you've had a sudden income spike.

Quick Action Plan

If your income is between £100,000 and £125,140:

1. Calculate your adjusted net income — include salary, bonuses, benefits, rental income, dividends, everything
2. Work out how much you need to sacrifice to get to £100,000 (or as close as possible)
3. Check if your employer offers salary sacrifice — if yes, use it; if not, make personal pension contributions
4. File your self-assessment — if you make personal contributions, you'll need to claim the extra relief through your tax return
5. Model it with our calculator — see exactly how much more you'll have at retirement by making these contributions now

The Bigger Picture

The 60% trap is one of the most poorly communicated features of the UK tax system. It punishes earners in a relatively narrow band while those above and below pay lower marginal rates.

But there's a silver lining: the very mechanism that creates the problem — pension contributions reducing adjusted net income — means that saving for retirement in this income band is extraordinarily tax-efficient. You're effectively being rewarded for doing something you should be doing anyway.

If you're in this band and not maximising pension contributions, you're leaving thousands of pounds on the table every year. Not just in tax savings today, but in compounded pension growth over decades.

Ready to see the impact? Try the PoundSense pension calculator — plug in your salary, set your pension contributions, and see how much escaping the 60% trap could add to your retirement pot.

Read next:

• Pension Tax Relief Explained — Complete guide to how tax relief works, claiming higher rate relief, and the annual allowance
• Pension Drawdown Explained — How to access your pension flexibly in retirement without running out of money