The 60% Tax Trap: Why £100k-£125k Earners Pay More Than Anyone Else (And How to Stop)

Author: TJ Smith

A UK taxpayer earning £125,141 this year pays the same income tax on that final £1 of income as a taxpayer earning £500,000. 40%.

But a taxpayer earning £100,001 pays 60% on that extra pound.

This is not a marginal rate that exists anywhere in the published tax tables. There is no 60% band. HMRC does not call it the 60% trap. It is an emergent consequence of how the personal allowance withdrawal interacts with the higher rate of income tax, and it is the most aggressive effective marginal rate in the entire UK tax system for ordinary income.

Most people in this band are PAYE employees. They receive a payslip, their employer deducts tax at the higher rate, and their self assessment bill arrives in January with a number that never quite makes sense. The 60% rate is rarely explained, almost never planned for, and costs thousands every year in tax that is not actually compulsory.

How the trap works: the mechanics

Every UK taxpayer receives a personal allowance of £12,570 for 2026/27. This is the first slice of income you do not pay income tax on. Once your adjusted net income exceeds £100,000, HMRC begins withdrawing this allowance.

The withdrawal rate: £1 of allowance lost for every £2 of income above £100,000.

At £125,140 of adjusted net income, the full £12,570 allowance has been withdrawn. Above that point, you are in the additional rate band (45%) but your allowance is already gone.

Why this creates 60%:

Consider someone earning exactly £100,001. On that extra £1 of income:

They pay 40% income tax on the £1 itself: 40p
The £1 above £100,000 triggers 50p of personal allowance withdrawal (£1 withdrawn for every £2 of excess income)
That 50p of allowance was previously sheltering 50p from tax. Now it is taxed at 40%
Extra tax on the withdrawn allowance: 40% x 50p = 20p
Total tax on the extra £1: 60p

Add employee NI. Between £50,270 and £125,140, employee NI runs at 2% on employment income. That makes the real marginal rate on employment income in this band 62%.

On dividends in this band, the rate is lower (approximately 54.25%) because dividend income carries no NI and the dividend tax rates are different. But the trap still exists.

Who this affects and how they usually find out

This catches a specific profile of person: someone who recently crossed the £100,000 threshold. A promotion, a strong bonus year, stock vesting, or a few months at a higher contract rate.

They know they pay 40% tax on their higher earnings. They do not know about the allowance withdrawal. So when the self assessment bill arrives, it is consistently higher than they expected.

The classic scenario: an employee earning £112,000 in salary. Their employer withholds tax based on their adjusted tax code (which HMRC sets after taking the taper into account). But the code is often wrong, or estimated, or fails to account for bonus timing. The January self assessment bill is the catch-up.

And then there is the case where someone gets a bonus that takes them from £98,000 to £115,000 for that year. On the £15,000 bonus: they expected to pay 40%, which would be £6,000. They actually pay 60% on the £15,000 above £100,000, which is £9,000. Plus 2% NI. The effective take-home on a £15,000 bonus at this level is approximately £5,700. Before you have even factored in pension, other income, or any of the other complications.

Worked example 1: the PAYE employee earning £115,000

Income and tax without planning:

Gross salary: £115,000
Personal allowance: £12,570 minus ((£115,000 minus £100,000) / 2) = £12,570 minus £7,500 = £5,070
Taxable income: £115,000 minus £5,070 = £109,930

Income tax: - £5,070 at 0% (remaining allowance) - £37,700 at 20% = £7,540 - £67,230 at 40% = £26,892 - Total income tax: £34,432

Employee NI: - £12,570 at 0% - £37,700 at 8% = £3,016 - £64,730 at 2% = £1,295 - Total employee NI: £4,311

Take-home: £115,000 minus £34,432 minus £4,311 = £76,257 Total tax and NI: £38,743 Effective rate: 33.7%

Worked example 2: same employee, pension contribution to escape the band

Action: Make a personal pension contribution that brings adjusted net income from £115,000 down to £100,000.

How a basic-rate relief at source pension contribution works:

You pay in £12,000 net
The pension provider claims 20% basic-rate relief from HMRC and adds it: £3,000
Gross contribution: £15,000

For the purpose of reducing adjusted net income, you deduct the gross contribution. So a £12,000 net payment (which becomes £15,000 gross) takes adjusted net income from £115,000 down to £100,000.

Net contribution you pay: £12,000
Basic-rate relief added by provider: £3,000
Gross contribution: £15,000
New adjusted net income: £115,000 minus £15,000 = £100,000
Personal allowance: fully restored at £12,570

Tax with the pension contribution:

Adjusted net income is now £100,000. Taxable income after personal allowance:

£100,000 minus £12,570 personal allowance = £87,430
£37,700 at 20% = £7,540
£49,730 at 40% = £19,892
Total income tax: £27,432

Employee NI: unchanged at £4,311 (NI is calculated on gross pay, not adjusted net income)

Take-home: £115,000 minus £12,000 (net pension payment) minus £27,432 (income tax) minus £4,311 (NI) = £71,257 in pocket, plus £15,000 in pension Total effective remuneration: £86,257

Higher-rate tax relief: HMRC owes the taxpayer 20% of the gross pension contribution back through self assessment (the difference between basic rate relief already given and higher rate relief due on income in the higher rate band that was deducted to bring income below £100,000).

Higher-rate relief on the £15,000 gross contribution: 20% x £15,000 = £3,000 refund via self assessment.

Adjusted net income cost of the pension contribution: £12,000 paid in, minus £3,000 refunded = £9,000 net personal cost of the £15,000 gross pension contribution.

Comparing the two positions:

Without pension: - Take-home: £76,257 - Tax and NI: £38,743 - Pension: £0

With pension contribution: - Take-home: £71,257 (£5,000 less in pocket) - Tax and NI: £31,743 (£7,000 less in tax) - Pension: £15,000 - Total remuneration: £86,257

The £12,000 net pension contribution: - Costs £9,000 after the higher-rate relief refund - Puts £15,000 into the pension - The net gain is £15,000 in the pension for a £9,000 net personal outlay. That is a 67% immediate return on the contribution, before any investment growth.

This is why the pension is not optional for people in this band. It is arguably the single best financial decision available to them.

The January shock: why self assessment bills surprise people in this band

Most PAYE employees do not expect a self assessment bill. Their employer deducts tax. Why is there more to pay?

Because HMRC's PAYE coding system for people in the taper band often underestimates the liability. The personal allowance taper depends on adjusted net income, which includes investment income, rental profits, and other sources that PAYE does not know about in advance. The code is set on an estimated basis and corrected through self assessment.

If you are in this band and you are not submitting a self assessment return, you may already have an outstanding liability. If you receive any income outside of PAYE (rental income, savings interest above the PSA, dividend income, freelance work), you almost certainly need to be registered.

The other tools: beyond pension contributions

Gift Aid: Charitable donations under Gift Aid reduce adjusted net income by the gross amount (same mechanism as pension contributions). A £8,000 Gift Aid donation is grossed up to £10,000 and deducted from adjusted net income. If you are charitably inclined, coordinating the timing of larger donations around the £100,000 threshold makes the same donation worth significantly more in total tax terms.

Salary sacrifice: If your employer offers salary sacrifice, agreeing to reduce your gross salary in exchange for an equivalent employer pension contribution brings gross salary below £100,000. This also saves you 2% NI on the sacrificed amount and saves your employer 15% NI, which some employers share back with the employee.

Company structure: For those with their own limited company, or who are directors of businesses, employer pension contributions do not enter adjusted net income at all. A company pension contribution of £15,000 simply reduces company profit, never appearing in the director's income. No personal tax filing adjustment needed.

Timing: If you are close to the £100,000 threshold and your year-end bonus can be deferred (it is within your control), timing it to fall in a year where other income is lower can avoid the trap entirely.

The self assessment position

If your income is above £100,000 from any source, you must file a self assessment return. This is an HMRC requirement, not optional.

File by 31 January 2027 for the 2026/27 tax year. Pay any balance by the same date.

If you have not been filing, back years can be addressed through a voluntary disclosure. The longer it goes, the more complicated it becomes.

Getting the planning right before year-end

The window to do something about the current tax year closes on 5 April 2027. Pension contributions made by that date count against the 2026/27 annual allowance and reduce 2026/27 adjusted net income.

If your current income projection puts you between £100,000 and £125,140, the single highest-value action is to model the pension contribution needed to bring adjusted net income to exactly £100,000, and then make it before 5 April.

Our high earner tax optimisation service models your specific adjusted net income, identifies all available reduction tools, and provides a clear action plan. Prices start at £750 for incomes between £100,000 and £150,000.

If you want to check whether it is worth having this conversation, you can find out here.

Frequently asked questions

What is the 60% tax trap? Between £100,000 and £125,140 of adjusted net income, the personal allowance of £12,570 is withdrawn at a rate of £1 for every £2 of income above £100,000. You pay 40% income tax on each extra pound, and the withdrawal of the allowance means another 20% effective rate on the income that was previously sheltered. Combined, this is 60% on each pound. Add 2% employee NI and the real marginal rate on employment income in this band is 62%.

Does the 60% rate apply to all types of income? The taper applies to all income that forms part of adjusted net income, including salary, bonuses, rental income, self-employment profits, dividends, and savings interest. The exact marginal rate varies slightly by income type. On dividends in this band, the effective marginal rate is approximately 54.25%. On employment income and self-employment income, 60% (62% with NI).

How do I calculate my adjusted net income? Start with your total gross income from all sources. Deduct gross pension contributions (the amount that went into the pension, not just your net contribution, so if you paid in £8,000 net the gross figure is £10,000 because of basic-rate relief). Deduct gross Gift Aid donations on the same basis. Deduct trading losses where applicable. The result is your adjusted net income. HMRC uses this figure, not your gross salary, to assess the taper.

What is the most effective way to reduce adjusted net income below £100,000? Pension contributions are by far the most efficient tool. Personal pension contributions reduce adjusted net income by the gross amount contributed. If your adjusted net income is £115,000, a gross pension contribution of £15,000 reduces adjusted net income to £100,000, restoring the full personal allowance and eliminating the taper. The tax saving from doing this in the £100k to £125,140 band is significantly higher than a normal pension contribution.

Can my employer make contributions to avoid the trap? Yes. Salary sacrifice pension arrangements reduce the gross salary on which income tax and NI are calculated. If your employer offers salary sacrifice and you reduce your gross salary from £115,000 to £99,999 through salary sacrifice, you exit the trap entirely. You also save NI (2% between £50,270 and £125,140) and your employer saves 15% NI on the sacrificed amount. This is one of the cleanest options available to employees.

Does receiving a bonus push me into the 60% trap? Yes, if the bonus takes your adjusted net income above £100,000. A £20,000 bonus for someone already earning £105,000 is effectively taxed at 60%, leaving only £8,000 after tax. The practical question is whether your employer would consider paying an equivalent employer pension contribution in lieu of the cash bonus. Some employers do. It requires agreement in advance. The pension contribution costs the employer the same amount (and saves them NI), and you receive £20,000 in the pension rather than £8,000 in cash.

I earn exactly £100,000. Should I be worried? Not yet, but it is worth being aware. The taper starts the moment adjusted net income exceeds £100,000 by a single penny. Any bonus, rental income, savings interest, or other income that takes you above £100,000 starts the clock. If you can keep adjusted net income at or below £100,000 through pension contributions, you avoid the trap entirely. This is worth modelling ahead of year-end.

What other income reduction tools exist besides pensions? Gift Aid donations reduce adjusted net income on the same basis as pension contributions (gross amount is deducted). Charitable giving with tax planning intent. Salary sacrifice for benefits other than pensions (childcare vouchers, cycle-to-work, electric vehicles) reduces gross salary, though the savings on income between £100k and £125k are more limited than pension. For business owners, employer pension contributions paid by the company do not enter adjusted net income at all. For employees without that option, personal pension contributions are the primary tool.

The 60% Tax Trap: £100k-£125k Personal Allowance 2026/27