Losing Your Personal Allowance: The GBP 100k-125,140 Tax Trap in 2026/27
Earn between GBP 100,000 and GBP 125,140 and your effective marginal tax rate hits 60%. Here is how the Personal Allowance taper works and how to avoid it.
If your income nudges above GBP 100,000 in 2026/27, you enter one of the most punishing bands in the UK tax system: a zone where your effective marginal rate reaches 60%. This is not a surtax -- it is the result of your Personal Allowance (PA) being gradually withdrawn, and it affects anyone whose adjusted net income (ANI) falls between GBP 100,000 and GBP 125,140.
Understanding how this works -- and the strategies available to avoid it -- is essential for anyone approaching this income level.
How the Taper Works
The standard Personal Allowance for 2026/27 is GBP 12,570. This is the amount you can earn tax-free. Above GBP 100,000 ANI, HMRC removes this allowance at the rate of GBP 1 for every GBP 2 of income above GBP 100,000.
The taper:
- Starts at: GBP 100,000 ANI
- Ends at: GBP 125,140 ANI (= GBP 100,000 + 2 x GBP 12,570)
- Effect: Personal Allowance reduced from GBP 12,570 to GBP 0
Above GBP 125,140, the allowance is gone entirely and you pay the 45% additional rate on all income above GBP 125,140 (above GBP 150,000 from a historical perspective, now aligned to the PA withdrawal point).
Why the Effective Rate Is 60%
In the GBP 100,000 to GBP 125,140 band, you are paying higher-rate income tax at 40% on the additional income. But you are also losing Personal Allowance -- and that lost allowance is income that now becomes taxable at 40%.
For every GBP 2 you earn above GBP 100,000:
- You pay 40% tax on that GBP 2 = GBP 0.80
- You lose GBP 1 of Personal Allowance, which means GBP 1 of previously tax-free income is now taxed at 40% = GBP 0.40
- Total tax on GBP 2 of income = GBP 1.20
- Effective rate = 60%
This is entirely legal and entirely intentional -- it is a fiscal quirk rather than a formal "60% rate".
Worked Example
Marcus is employed at a salary of GBP 105,000.
| Amount | |
|---|---|
| Gross salary | GBP 105,000 |
| Income above GBP 100,000 | GBP 5,000 |
| PA reduced by | GBP 2,500 (GBP 5,000 / 2) |
| Remaining PA | GBP 10,070 |
| Tax on GBP 5,000 at 40% | GBP 2,000 |
| Tax on lost PA (GBP 2,500 at 40%) | GBP 1,000 |
| Extra tax vs someone earning GBP 100,000 | GBP 3,000 on GBP 5,000 = 60% |
If Marcus instead earned GBP 125,000:
- Income above GBP 100,000 = GBP 25,000
- PA reduced by GBP 12,500 (fully withdrawn at GBP 25,000 / 2)
- Tax on GBP 25,000 at 40% = GBP 10,000
- Tax on lost PA (GBP 12,500 at 40%) = GBP 5,000
- Extra tax = GBP 15,000 on GBP 25,000 = 60% average through the band
What Counts as Adjusted Net Income?
Adjusted net income (ANI) is not simply your gross salary. HMRC calculates it as:
Total income minus certain deductions, including:
- Gross pension contributions (employer scheme deductions or personal contributions under relief at source)
- Gift Aid donations (uplifted to gross)
- Trading losses brought forward
- Losses from property rental
This is key -- because it means you can reduce your ANI through legitimate planning.
Strategy 1: Pension Contributions
Making a pension contribution is the single most effective way to escape the 60% trap. Each GBP 1 contributed (gross) reduces ANI by GBP 1.
If your ANI is GBP 120,000 and you contribute GBP 20,000 to a pension:
- ANI reduces to GBP 100,000
- Personal Allowance restored to GBP 12,570
- Tax saved: GBP 12,000 (GBP 20,000 x 60% effective rate)
- Net cost of GBP 20,000 pension contribution: only GBP 8,000
This makes pension contributions in the taper zone extraordinarily efficient -- effectively attracting tax relief at 60%.
Annual Allowance Limits
You can contribute up to 100% of your earned income or GBP 60,000 (the annual allowance for 2026/27), whichever is lower, with tax relief. If you have unused annual allowance from the previous three years, you can carry it forward to make larger contributions.
Strategy 2: Gift Aid Donations
Like pension contributions, Gift Aid donations reduce your ANI. Donating GBP 800 to charity creates a gross Gift Aid donation of GBP 1,000 (HMRC adds basic-rate tax to the charity). This reduces ANI by GBP 1,000.
At GBP 110,000 ANI, a GBP 10,000 Gift Aid donation (gross) would save GBP 6,000 in tax while costing you GBP 8,000 out of pocket -- effectively 40% relief on the donation rather than the standard 20%.
Strategy 3: Salary Sacrifice
If your employer offers salary sacrifice schemes (for example, increased pension contributions deducted before tax, electric car schemes or childcare vouchers through older schemes), these reduce your gross salary and therefore your ANI. The benefit is the same as pension contributions but administered through payroll.
Strategy 4: Timing Income
If you have flexibility over when income arises -- for example, you control when a bonus is paid or when you take dividends from your company -- you may be able to shift income between tax years to keep ANI below GBP 100,000 in each year. This requires forward planning but can be highly effective.
The Childcare Trap
High earners in the GBP 100,000 zone also lose access to Tax-Free Childcare (GBP 2,000 annual top-up per child) if ANI exceeds GBP 100,000. For families with young children, factoring in this loss alongside the 60% income tax rate makes pension contributions even more compelling.
Reporting Requirements
If your income exceeds GBP 100,000, you must register for Self Assessment and file a return. HMRC will not automatically adjust your tax code to fully reflect Personal Allowance withdrawal -- you need to declare your income and have the correct tax calculated via your return.
Use our Income Tax calculator to model the full effect of the Personal Allowance taper on your specific income and pension contribution decisions.
Frequently asked questions
At what income does the Personal Allowance start to reduce?
The Personal Allowance begins tapering when your adjusted net income exceeds GBP 100,000. For every GBP 2 earned above GBP 100,000, you lose GBP 1 of your GBP 12,570 Personal Allowance.
At what income is the Personal Allowance completely gone?
The Personal Allowance is fully withdrawn at an adjusted net income of GBP 125,140 (GBP 100,000 plus 2 x GBP 12,570). Above this level you have no Personal Allowance and pay 45% additional rate tax on all income.
Why is the effective tax rate 60% between GBP 100k and GBP 125,140?
In this band you pay 40% income tax on the additional income, plus you lose Personal Allowance -- that lost allowance is taxed at 40% too. The combined effect is 40% + 20% (40% of the GBP 0.50 lost allowance per GBP 1 earned) = 60%.
How can I reduce my adjusted net income below GBP 100,000?
The most common strategies are making pension contributions (these reduce adjusted net income pound for pound), making Gift Aid donations, or restructuring income timing. Even GBP 1 of pension contribution above GBP 100,000 ANI saves 60p in tax.
Does the Personal Allowance taper affect Scottish taxpayers?
Yes. Scottish taxpayers also lose their Personal Allowance above GBP 100,000 ANI. However, because Scottish income tax rates above GBP 43,662 are higher than UK rates, the effective marginal rate in the taper zone is even higher for Scottish residents.
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