The £100k Tax Trap: How to Avoid Paying 60% Tax in 2025-26

Last Updated: 18 March 2026 | Tax Year: 2025-26

Earning over £100,000 should feel like a career milestone. Instead, it triggers Britain's most brutal tax trap: a hidden 60% marginal rate that can cost you thousands.

Here's the shocking truth: in this band, your marginal income tax rate (60%) is higher than the 45% additional rate paid by those earning over £125,140. A £5,000 raise could leave you with just £1,900 in your pocket—less than half.

In this guide, we'll explain exactly how this trap works, how much it costs you, and how to avoid it legally and intelligently.

Check if you're in the tax trap now

Parents take note: Crossing £100,000 can also trigger loss of Tax-Free Childcare and, in England, the 30 hours free childcare offer for working families—making the effective marginal hit even worse than 60%.

Quick Summary (TL;DR)

• The Trap: Earn £100k-£125k = 60% effective tax rate (plus 2% NI = 62% total)
• The Cause: HMRC reduces your Personal Allowance by £1 for every £2 over £100k
• The Cost: Up to £5,028 extra tax (vs. someone earning £99,999)
• The Fix: Pension contributions to drop below £100k threshold
• ROI: £1 pension contribution can cost ~40p in the taper zone (60% relief)

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What is the £100k Tax Trap?

The Normal Tax System (Simplified)

In the UK, you normally pay tax like this:

Seems straightforward, right? Wrong.

The Twist: Personal Allowance Taper

Here's what HMRC doesn't shout about: once your adjusted net income (ANI) exceeds £100,000, they start taking away your tax-free Personal Allowance.

The rule (from official HMRC guidance):

Your Personal Allowance reduces by £1 for every £2 of adjusted net income over £100,000.

What counts as adjusted net income? Employment income, self-employment profits, rental income, dividends, savings interest, and most other taxable income—minus pension contributions and Gift Aid donations. Full HMRC definition

This creates a brutal effective tax rate:

• You pay 40% tax on income over £100k (normal higher rate)
• PLUS you lose 40% tax on the Personal Allowance you're losing
• Total effective rate: 60%

At £125,140, your Personal Allowance disappears completely. Which means someone earning £125,140 has zero tax-free income—they pay tax on every single pound.

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How Does It Work? (With Real Numbers)

Example: £110,000 Salary

Normal calculation (what you might expect):

• Income over £100k: £10,000
• Tax at 40%: £4,000

Actual calculation (with taper):

• Income over £100k: £10,000
• Lost Personal Allowance: £10,000 ÷ 2 = £5,000
• Tax on income: £10,000 × 40% = £4,000
• Tax on lost allowance: £5,000 × 40% = £2,000
• Total tax on £10k income: £6,000 = 60% rate

See the full £110k breakdown

How the Calculation Works

For every £2 you earn over £100k:

1. You pay 40% tax on the £2 = £0.80
2. You lose £1 of Personal Allowance (taper rate: £1 per £2)
3. That lost £1 of allowance gets taxed at 40% = £0.40
4. Total: £1.20 tax on £2.00 income = 60% effective rate

Or simplified, for every £1 of income over £100k:

• Direct tax: £0.40 (40% higher rate)
• Lost allowance: £0.50 × 40% = £0.20 (the "hidden" extra tax)
• Total: £0.60 tax = 60% effective rate

Add 2% employee National Insurance on this slice, and you're looking at 62% marginal deductions on every pound between £100k and £125,140.

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How Much Does It Cost You?

The extra tax due to the taper (not the total tax, just the additional amount caused by losing your Personal Allowance) is calculated as:

Extra tax = Lost Allowance × 40% = (Salary − £100,000) × 20%

This caps at £5,028 when your allowance is fully gone at £125,140.

Real Impact

Scenario: You earn £115,000

• Lost Personal Allowance: £7,500
• Extra tax from taper: £3,000 per year
• Over 5 years: £15,000 lost to the trap
• Over 10 years: £30,000 lost to the trap

That's a deposit on a house. A new car. A year of private school fees. Gone.

Calculate your exact position at £115k

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Why Does This Exist?

Brief History

In 2010, Chancellor Alistair Darling introduced the Personal Allowance taper as a "temporary" measure—a way to squeeze more from high earners without the political fallout of raising the headline 45% rate.

15 years later, it's still here. So much for temporary.

HMRC's Logic

• Target high earners without changing visible tax rates
• "Stealth tax" - less politically controversial
• Easier to sell than "we're raising income tax to 60%"

The Reality

• Penalizes middle-class professionals, not ultra-wealthy
• Creates bizarre incentive to earn less or defer income
• A £1 raise can cost you £0.60 (plus 2% NI = 62p total!)
• Affects hundreds of thousands of taxpayers annually

The result? A system that punishes career progression at exactly the point where professionals often have families, mortgages, and the highest financial pressures. You finally get that promotion—and HMRC takes 60p of every extra pound.

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5 Legal Ways to Avoid the Trap

Strategy 1: Maximize Pension Contributions

This is the most powerful strategy. Here's why:

Example: £115,000 salary

Current position:

• Salary: £115,000
• Adjusted net income: £115,000
• Personal Allowance: £7,570 (reduced)
• In 60% trap on £15,000

Optimized position:

• Salary: £115,000
• Pension contribution: £15,000
• New adjusted income: £100,000
• Personal Allowance: £12,570 (FULL)
• Take-home: ~£68,557 (same as £100k take-home)

The calculation:

• Pension deposit: £15,000
• Tax saved: £15,000 × 62% = £9,300
• Net cost to you: £15,000 - £9,300 = £5,700
• Instant ROI: ~160% (£9,300 saving on £5,700 cost)

How it works:

1. Pension contributions reduce your adjusted net income
2. Lower income = higher Personal Allowance
3. Higher Personal Allowance = less tax
4. Plus you get pension tax relief
5. Plus employer matched contributions (if available)
6. Plus 25% tax-free lump sum at retirement

Two ways to contribute—outcomes differ:

If you use salary sacrifice, you may also save 2% employee NI in this band—so the marginal benefit can exceed 62%.

Annual allowance warning: Higher earners (adjusted net income over £260,000) may have a tapered annual allowance. Check before making large contributions.

Calculate your optimal pension contribution

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Strategy 2: Salary Sacrifice

Exchange salary for non-cash benefits that don't count as income:

Popular schemes:

• Electric car leasing (£5k-£15k saving potential)
• Cycle to work (up to £1,000)
• Childcare vouchers (up to £2,549/year for existing schemes)
• Additional pensions (unlimited)
• Technology schemes (laptops, phones)

Example: £5,000 electric car salary sacrifice

• Reduces taxable income to £110,000
• Tax saved: £5,000 × 62% = £3,100
• Plus: Get a car worth £5,000
• Net cost: Only £1,900 for a £5,000 car

Check with your employer - not all offer these schemes.

Read our full salary sacrifice guide

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Strategy 3: Employer Pension Contributions

Ask your employer to increase their pension contribution instead of giving you a salary raise.

Example:

• Raise offered: £5,000
• Alternative: £0 raise + £5,000 employer pension
• Your taxable income: Unchanged (stays £100k)
• Your pension pot: +£5,000
• Tax saved: £5,000 × 62% = £3,100

Why it works:

• Employer contributions don't count as your income
• They go straight to pension
• You avoid the 60% trap
• Still grows your retirement pot

Best for: Salary negotiations, annual reviews, bonuses

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Strategy 4: Time Your Income

If you have control over when you receive income:

Strategies:

• Defer bonuses to next tax year
• Spread income across tax years
• Freelancers/contractors: Invoice strategically
• Investment income: Tax-deferred accounts (ISAs, SIPPs)

Example: £10,000 bonus

Instead of taking £10,000 in one year:

• Year 1: £5,000 (keeps you below £100k)
• Year 2: £5,000 (keeps you below £100k)
• Tax saved: up to £6,000 vs taking it all at once (exact amount depends on your base salary and how far into the trap you'd otherwise fall)

Important: Only works if you can control timing legally.

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Strategy 5: Charitable Donations (Gift Aid)

Gift Aid donations to registered charities can reduce your adjusted net income.

How it works:

• You donate from post-tax income
• The charity claims 25% basic rate relief (Gift Aid)
• You claim higher-rate relief (20%) through Self Assessment
• The gross donation amount reduces your income for taper purposes

The benefit depends on your specific situation:

• Whether the donation moves you out of (or further into) the taper zone
• Your exact income level and other deductions
• The size of the donation relative to your income over £100k

Best for: Those who donate to charity anyway and want to understand the tax efficiency. For precise calculations on how a specific donation affects your position, use our calculator or consult a tax adviser.

HMRC Gift Aid guidance

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What NOT to Do

Common Mistakes

Turning down raises - The maths still favours taking the raise. Even at 60%, you keep 40p of every £1. That's better than 0p.

Ignoring it completely - £3k-£7k per year is real money

Tax avoidance schemes - Illegal, risky, and HMRC is cracking down

Not planning ahead - Last-minute contributions may not work

Forgetting student loans - Plan 1/2 adds 9% more! (69% total marginal rate!)

Reality Check

Should you turn down a raise to avoid the trap?

NO! Here's why:

• At 60%, you keep 40p of every £1
• That's still better than earning nothing
• Plus pension contributions can offset it
• Your lifetime earnings matter more than one year's tax

Better question: How can I optimize what I do earn?

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Using PayeTax's £100k Tax Trap Optimizer

We built a free tool to make this simple. Here's how it works:

Step 1: Enter Your Salary

Go to PayeTax Calculator and enter your salary (e.g., £115,000).

Step 2: See the Warning

If you're in the trap zone (£100k-£125k), you'll see:

Tax Trap Detected
You're in the £100k-£125k zone where you lose Personal
Allowance at an effective 60% rate.

Step 3: View Optimizer Recommendation

Click "View Optimizer" to see:

Current Position:

• Salary: £115,000
• Personal Allowance: £7,570 (reduced)
• Effective rate: 60% on £15,000
• Take-home: £74,257

Optimized Position:

• Salary: £115,000
• Pension contribution: £15,000
• New adjusted income: £100,000
• Personal Allowance: £12,570 (FULL)
• Take-home: £68,557
• Retirement pot: +£15,000

Tax Saved: £9,300 Net Cost: £5,700 Pension Added: £15,000

Step 4: Apply Suggestion

One-click updates the calculator with the recommended pension amount to see the full impact.

Try it now: Calculate at £115k | Calculate at £110k | Calculate at £120k

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Advanced Scenarios

Scenario A: Student Loans

Plan 1 or 2 adds 9% repayment rate:

• Base trap rate: 60% (income tax)
• Employee NI: +2%
• Student loan: +9%
• Total marginal rate: 71%!

Postgraduate loan adds 6%:

• Base trap rate: 60% + 2% NI
• Postgraduate loan: +6%
• Total marginal rate: 68%

Combined (Plan 1/2 + Postgraduate):

• 60% + 2% + 9% + 6% = 77% marginal rate
• You keep only 23p of every £1 earned

Which means if you have student loans and earn £100k-£125k, pension contributions via salary sacrifice are even more critical—you're recovering up to 77p on every pound you contribute.

Solution: Even more important to use pension contributions!

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Scenario B: Scottish Taxpayers

Scottish taxpayers:

• Still get Personal Allowance taper (reserved UK matter)
• But Scottish tax bands apply to remaining income
• Can be even more complex with Scottish starter/basic/intermediate rates

Recommendation: Use PayeTax's Scottish tax calculator to see your exact position.

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Scenario C: Multiple Income Sources

All income counts towards your adjusted net income and the £100k threshold:

• Employment income
• Self-employment profits
• Rental income
• Dividends
• Bank interest
• Capital gains (separate system, but can affect ANI in some cases)

Plan holistically - pension contributions can reduce your total income from all sources.

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Frequently Asked Questions

Does everyone earning £100k pay 60%?

No. You only pay 60% on income between £100k and £125,140.

• Below £100k = 40% rate
• £100k-£125k = 60% rate
• Above £125,140 = 45% rate

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Can I claim back overpaid tax?

Yes, if your employer didn't adjust your tax code correctly.

How:

1. Wait for P800 form from HMRC (automatic)
2. Or file Self Assessment and claim relief
3. Or claim through HMRC online services

Deadline: 4 years from end of tax year

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Do bonuses count towards the £100k threshold?

Yes! All employment income counts towards your adjusted net income:

• Salary
• Bonuses
• Commission
• Benefits in kind (most)
• Overtime

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What about dividends and rental income?

Yes, they count too.

Your adjusted net income includes:

• All employment income
• Self-employment profits
• Property rental income
• Dividend income
• Savings interest
• Pensions received

But: You can reduce it with pension contributions and Gift Aid donations.

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Can I split income with my spouse?

Limited options:

Marriage Allowance doesn't help here (only for basic rate taxpayers)

You can:

• Transfer assets to spouse (rental property, investments)
• Use spouse's ISA allowance
• Consider pension sharing
• Joint ownership structures

Consult a tax advisor for complex situations.

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Is the 60% rate the same in Scotland?

The taper applies UK-wide, but Scottish income tax rates apply to Scottish taxpayers.

• Personal Allowance taper: Same rules (reserved UK matter)
• But: Scottish tax bands differ (19%, 20%, 21%, 42%, 45%, 48%)
• The effective marginal rate in the taper zone may differ slightly depending on which Scottish band you're in

Use our Scottish tax calculator to see your exact position.

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Is it legal to use pensions to avoid this?

100% legal! This is exactly what HMRC expects and encourages.

Pension tax relief is:

• Written into law
• Designed to encourage saving
• Used by millions of people
• Recommended by financial advisors

This is tax planning, not tax avoidance.

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Summary & Next Steps

Key Takeaways

• £100k-£125k trap is real and costs up to £5,028 per year in extra tax
• 60% effective income tax rate (62% with NI) due to Personal Allowance taper
• Pension contributions are the best legal solution
• ROI: 150%+ - £1 pension contribution effectively costs ~40p after tax relief (or ~38p with salary sacrifice)

Action Plan

Today:

1. Calculate your position
2. Review your pension contribution options
3. Check employer's salary sacrifice schemes

This month:

1. Speak to your employer about pension contributions
2. Update your payroll if needed
3. Register for Self Assessment (if not already)

Before April 6th (tax year end):

1. Make any one-off pension contributions
2. Review next year's salary structure
3. Plan for bonuses/raises

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Calculate Your Position Now (Free)

Use PayeTax's £100k Tax Trap Calculator to:

• See if you're affected
• Calculate exact cost
• Get personalized pension recommendations
• Compare before/after scenarios

No sign-up. No email. Completely private.

Calculate £105k salary | Calculate £110k salary | Calculate £115k salary | Calculate £120k salary

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Additional Resources

• Salary Sacrifice Guide - Save even more with employer schemes
• Scottish Tax Calculator - Scottish taxpayers in the trap
• HMRC Official Guidance - Personal Allowance taper rules
• About PayeTax - Learn about our features and mission

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Questions? Comments? Use PayeTax's calculator to explore your options at your exact salary level.

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Last updated: 18 March 2026. Tax rules current for 2025-26 tax year.