HMRC will not tell you about this. Between £100,000 and £125,140 you are paying a 60% effective tax rate — and it gets worse if you have student loans, children, or a working spouse. Here is everything most guides leave out.
The 60% tax trap is not a named tax band — it is a side effect of how the personal allowance taper works. Everyone in the UK gets a £12,570 personal allowance (income you earn tax-free). But for every £2 you earn above £100,000, you lose £1 of that allowance.
This means the £25,140 of income between £100,000 and £125,140 is effectively taxed at 60%: 40% income tax on the income itself, plus 40% on the personal allowance you lose (which would otherwise have been tax-free at the 20% basic rate that is now charged, creating an additional effective 20%).
In practical terms: if you earn £110,000, you lose £5,000 of personal allowance. That lost allowance means £5,000 of income that was previously tax-free is now taxed at 40%, costing you an extra £2,000 in tax — on top of the £4,000 (40%) you already pay on that £10,000 above £100k. That is £6,000 tax on £10,000 of income. 60%.
In 2017, around 300,000 people were caught in the 60% trap. By 2025, that number has grown to over 725,000 due to frozen thresholds and rising wages. By 2029, projections suggest 2.3 million people will be affected.
Here is what happens to each additional £1,000 earned in the trap band (£100k–£125k):
£1,000 gross income → £400 income tax (40%) → £500 of personal allowance lost → that £500 is now taxed at 40% = £200 extra tax → total tax: £600 → you keep: £400.
Add National Insurance at 2% above £50,270 and you keep even less: around £380 per £1,000. But it gets worse when you stack other costs on top.
Most articles about the 60% trap only cover income tax. But crossing £100,000 triggers several other losses that make the real cost much higher:
If you have a student loan, repayments are calculated on your gross income — the personal allowance taper does not reduce them. Plan 2 borrowers (post-2012 loans) repay 9% on income above £27,295.
Someone earning £110,000 on Plan 2 pays: 60% effective income tax + 2% NI + 9% student loan = a 71% effective marginal rate. You keep just £290 of every extra £1,000. This combination is almost never mentioned in mainstream tax guides.
Our tax calculator includes student loan repayments for all plan types — enter your loan type and see the true combined rate.
Plan 1: 9% above £24,990 | Plan 2: 9% above £27,295 | Plan 4: 9% above £31,395 | Plan 5: 9% above £25,000 | Postgraduate: 6% above £21,000. These all stack with the 60% trap.
If either parent earns over £100,000, the family loses eligibility for Tax-Free Childcare (worth up to £2,000 per child per year) and the 15/30 free childcare hours (worth up to £9,400 per child per year for the extended 30-hour entitlement).
This is a cliff edge, not a taper. Earn £99,999 and you get the full benefit. Earn £100,001 and you get nothing. A family with two children under 5 could lose over £18,000 in childcare support by crossing £100,000.
The Institute for Fiscal Studies has shown that parents with two young children can be financially better off earning £99,999 than £140,000 once all benefit losses are accounted for.
If you are a dual-income household, use our calculator's spouse mode to model both incomes side by side — you can see whether shifting income between partners through pension contributions would keep you below the £100k cliff edge.
If your spouse earns less than the personal allowance (£12,570), they can transfer £1,260 to you — saving up to £252 per year. But this only works if the receiving partner is a basic-rate taxpayer.
Once you earn over £50,270, you are a higher-rate taxpayer and cannot receive the transfer. This is not directly caused by the 60% trap, but many couples in the £100k+ band are unaware they have lost this. Check your eligibility with our marriage allowance calculator.
Basic-rate taxpayers get £1,000 of tax-free savings interest. Higher-rate taxpayers get £500. Additional-rate taxpayers (above £125,140) get nothing.
With savings rates at 4-5%, this means an additional-rate taxpayer with £25,000 in a savings account pays around £500 more tax per year than a basic-rate taxpayer — purely because of the allowance difference.
When you add up all the losses for someone earning just above £100,000 with a student loan and two young children, the numbers are stark:
60% effective income tax rate + 2% NI + 9% student loan repayment + the monetary value of lost childcare (can exceed £18,000 per year). Depending on how you account for the childcare cliff edge, the effective marginal rate on the first pound above £100,000 can exceed 80% when all losses are monetised.
Our 60% trap analysis tool calculates the income tax, NI, and personal allowance impact specific to your salary — showing exactly how much extra tax you pay and the optimal pension contribution to escape.
The most effective escape route is pension contributions. The formula is simple:
Ideal additional pension contribution = your adjusted net income minus £100,000.
If you earn £120,000, you need £20,000 in additional pension contributions to bring your adjusted net income to £100,000 and fully restore your personal allowance. Our trap analysis tool calculates this number for you automatically.
Want to see how those pension contributions grow over time? Our retirement planner models your pension pot growth and projects your retirement income — so you can see that the money you shelter from the 60% trap is not lost, it is building your future.
Salary sacrifice is the superior method. With salary sacrifice, your employer reduces your contractual salary before tax and NI are calculated, then pays the reduction directly into your pension. You save income tax AND National Insurance. Read our full salary sacrifice guide for the step-by-step setup.
With personal contributions, your pension provider claims 20% basic-rate relief, and you claim the additional 20-25% via self-assessment. But you still pay full NI on the original salary.
For a £120,000 earner making £20,000 in pension contributions: salary sacrifice saves approximately £1,600 more per year than personal contributions (the employer NI saving, which many employers pass through to your pension). Our tax strategies tool models both methods side by side so you can see the exact difference for your income.
Important: The government has announced a cap on salary sacrifice NI savings of £2,000 per year from April 2029. Until then, there is no cap — maximise it now.
Gift Aid donations extend your basic-rate band, which effectively reduces your adjusted net income. A £10,000 Gift Aid donation (grossed up to £12,500) reduces your adjusted net income by £12,500.
If you earn £112,500 and make a £10,000 net Gift Aid donation, your adjusted net income drops to £100,000 — fully restoring your personal allowance. The effective cost of the donation is much less than £10,000 once you factor in the 60% marginal relief.
For people who already donate to charity, this is free money. Simply claiming Gift Aid on existing donations can trigger significant tax savings. Enter your Gift Aid donations in our calculator to see the impact on your take-home pay.
Many people have a base salary below £100,000 but get pushed over by a year-end bonus, share vesting, rental income, or other one-off payments. This is often more frustrating than a steady salary in the trap band because it feels unexpected.
If you know a bonus is coming, you can make a pension contribution in the same tax year to offset it. You do not have to contribute before the bonus — you have until the end of the tax year (5 April) to make personal pension contributions that reduce your adjusted net income for that year.
Carry forward rules also help: if you did not use your full £60,000 pension allowance in the previous 3 years, you can carry the unused amount forward and make a larger contribution in the bonus year. Learn more in our pension tax relief guide.
Use our calculator to model your total income including bonuses, rental income, and dividends — it handles all income types and shows where you land in the trap band.
Scottish taxpayers face a 67.5% effective marginal rate in the equivalent trap band, not 60%. This is because the Scottish higher rate is 42% (not 40%), and the equivalent of the additional 20% from lost personal allowance is calculated against Scottish rates.
Add 2% NI and a Scottish higher earner keeps just £285 per additional £1,000 in the trap band. With a student loan, this drops below £200. Scotland has the highest effective marginal rate for this income band anywhere in the UK.
Our calculator supports Scottish tax rates — select the 2025-26 tax year and add your Scottish income to see your exact position.
This sounds counterintuitive, but it is a legitimate question. If a £5,000 pay rise pushes you from £98,000 to £103,000, the maths may not work in your favour — especially if you lose childcare benefits.
The answer is almost always: take the pay rise, but use salary sacrifice to keep your adjusted net income at or below £100,000. You get the higher contractual salary (useful for mortgages and future pay negotiations) while avoiding the tax trap entirely. The pension contribution grows tax-free for your future.
If salary sacrifice is not available, consider personal pension contributions to achieve the same result. The key principle: earn more, but shelter the excess in your pension rather than paying 60%+ to HMRC.
1. Check your adjusted net income. Use our tax calculator to see exactly where you stand — it takes 30 seconds.
2. See your trap exposure. Our 60% trap analysis shows your marginal rate at every income level and calculates the optimal pension contribution.
3. Ask your employer about salary sacrifice. If they offer it, switch your additional pension contributions to salary sacrifice immediately. See our salary sacrifice guide for the conversation template.
4. If you have children under 5, check your childcare eligibility. Staying below £100k could save your family over £18,000 per year.
5. Review your Gift Aid donations. If you donate to charity, make sure you are claiming Gift Aid and including it on your tax return.
6. Model your strategies. Use our tax strategies tool to see the exact savings from pension, salary sacrifice, and Gift Aid based on your specific income.
7. Plan your retirement. Our retirement planner shows how the money you shelter from the trap grows into retirement income — your pension contributions are not a cost, they are your future.
8. Save and compare scenarios. Run the calculator with different inputs, save each scenario, and compare side by side to find the optimal approach for your household.