The £100k Tax Trap Explained
Earn over £100,000 and the UK tax system hits you with a hidden 60% marginal rate — the result of your Personal Allowance being silently eroded. We show you the full picture with interactive charts, a pension rescue calculator, and real numbers that other sites won't show you.
60%
Effective Marginal Rate
On income £100k–£125k
£12,570
Allowance Lost
Fully lost by £125,140
~300k
Earners Affected
UK taxpayers in this band
60p/£1
Pension Discount
Effective pension top-up
Marginal Tax Rate at Every Salary Level
The red bars reveal the 60% trap zone. For every £1 earned between £100,000 and £125,140, HMRC takes 60p — that's 20p more than the standard 40% higher rate band.
2026/27 UK income tax rates (England, Wales & NI). Excludes National Insurance.
Take-Home Pay vs Gross Salary
Notice the almost flat line between £100k and £125k — a £25,000 pay rise yields almost no extra take-home. This is the trap made visible.
The Real Numbers: Gross vs Take-Home
This table makes the trap impossible to ignore. Look how little changes between £100k and £125k — earning £25k more only nets you ~£6,000. You're effectively working 25% of your year for almost nothing.
| Gross Salary | Personal Allowance | Income Tax | Take-Home | Eff. Tax Rate |
|---|---|---|---|---|
| £99,000 | £12,570 | £27,032 | £71,968 | 27.3% |
| £100,000 | £12,570 | £27,432 | £72,568 | 27.4% |
| £105,000 TRAP ZONE | £10,070 | £30,432 | £74,568 | 29.0% |
| £110,000 TRAP ZONE | £7,570 | £33,432 | £76,568 | 30.4% |
| £115,000 TRAP ZONE | £5,070 | £36,432 | £78,568 | 31.7% |
| £120,000 TRAP ZONE | £2,570 | £39,432 | £80,568 | 32.9% |
| £125,000 TRAP ZONE | £70 | £42,432 | £82,568 | 33.9% |
| £130,000 | £0 | £44,703 | £85,297 | 34.4% |
* 2026/27 rates. Income Tax only. Excludes NI, pension, and student loans.
🔴 Why 60%? The Maths
When you earn £1 above £100,000, two things happen simultaneously:
40p in normal higher-rate tax
£1 earned × 40% higher rate = 40p tax
50p of allowance taper (costs 20p more)
Every £2 earned → £1 of tax-free allowance lost → 40% × £0.50 = 20p extra
🟢 Why Pension Is 60% Discounted
Pension contributions reduce your adjusted net income — putting you back below the trap threshold.
£10,000 into pension
Your adjusted net income reduces by £10,000
You save ~£6,200 in tax
40% tax relief + restored personal allowance = 60% effective saving
🛠 Pension Rescue Calculator
Drag the slider to see how a pension contribution on a £110,000 salary restores your allowance and slashes your tax bill.
£33,432
Before Tax Saving
£110k tax bill
£33,432
After Tax Saving
with pension
£0
Tax Saved
by HMRC funding it!
£0
Net Pension Cost
0.0% off
Personal Allowance Erosion by Salary
Your £12,570 tax-free Personal Allowance vanishes at the rate of £1 for every £2 you earn above £100,000. By £125,140 it is completely gone — forever.
100.0% remaining
80.1% remaining
60.2% remaining
40.3% remaining
20.4% remaining
❌ Fully eliminated
5 Ways to Escape the £100k Tax Trap
Pension Salary Sacrifice
The most powerful tool. Salary sacrifice contributions reduce your gross pay for HMRC purposes, restoring your Personal Allowance at a 60% effective discount.
→ Use Salary Sacrifice CalculatorGift Aid Donations
Charitable donations via Gift Aid extend your basic rate band, reducing adjusted net income. A £10,000 donation can save £2,000 in extra taxes plus restore allowance.
Spouse / Partner Pension
Contributing to a non-earning or lower-earning spouse's pension can reduce household tax liability while building their retirement savings.
→ Pension CalculatorDefer Bonus or Income
If your employer agrees, deferring a bonus to a new tax year can keep you below £100k in the current year and avoid the trap entirely.
→ Bonus Tax CalculatorCycle to Work / EV Scheme
Salary sacrifice for an EV or bike also reduces adjusted net income. While smaller than pensions, every pound helps reclaim your allowance.
→ Explore Salary SacrificeVenture Capital Trusts (VCT)
Investing in qualifying VCTs or EIS schemes can provide 30% income tax relief, effectively reducing your adjusted net income.
Frequently Asked Questions
Salary Sacrifice Calculator →
Model the exact pension contribution to escape your trap
Full UK Salary Calculator →
Full breakdown with NI, student loan, pension & more
Self Assessment Calculator →
Estimate your Self Assessment liability if in this band
Calculate Your Exact Tax Bill
Pre-loaded at £110,000 — right in the heart of the trap. Adjust your salary, add pension contributions, and see exactly what you keep.
Your Results
A breakdown of your income and deductions for the 2026/27 tax year.
Estimated Take-Home Pay
£59,793.40
- Take-Home£59,793.40
- Tax£40,496.00
- NI£4,210.60
- Pension£5,500.00
| Gross Pay | £110,000.00 |
| Income Tax | -£40,496.00 |
| National Insurance | -£4,210.60 |
| Pension Contribution | -£5,500.00 |
Tax Band Breakdown
Visualize how your income is taxed across different bands.
Salary Simulators
See "What If" scenarios without changing your main data.
Pension Power-Up
Increase your contribution to see how it affects take-home.
Bonus Impact
See how a bonus affects your take-home.
Adding this to a single month's pay.
Marriage Allowance Check
Can you save £252?
Since one earns < £12,570 and the other pays Basic Rate, you can transfer allowance.
A Financial Reference You Can Trust
Updated for the 2026/2027 tax year.
How Our Calculations Are Made
Our calculator uses the official PAYE (Pay As You Earn) algorithms provided by HMRC. We simultaneously process your Income Tax bands, National Insurance thresholds, and Student Loan repayment schedules to provide a precise take-home figure.
Calculated by applying the personal allowance and progressive tax bands (20%, 40%, 45%).
Processed using Class 1 Primary thresholds and rates for the current tax year.
Official Data Sources
We source our tax rates and rules directly from official UK government portals to ensure 100% compliance with latest budget announcements.
Accuracy Disclaimer
This tool provides a highly accurate estimate of your take-home pay. However, final figures on your official payslip may vary depending on:
- • Mid-month tax code changes from HMRC.
- • Specific workplace benefit schemes (e.g. Cycle2Work).
- • Emergency tax codes used by new employers.
- • Arrears or back-pay adjustments.
Meet the Makers
Sameer, Co-Founder
Lead Developer
I built this tool because I believe UK taxpayers deserve absolute clarity. My mission is to provide you with the most precise, ad-free financial calculators available.
Standard Verification Cases
Matches typical 1257L payslip to 99.8% accuracy.
Accurately handles higher-rate tax and NI thresholds.
Verified logic for Personal Allowance tapering.