Example
Salary sacrifice on £100,000
A worked example showing why salary sacrifice is dramatically more valuable at £100,000 — where the personal allowance taper creates an effective 60% tax rate and sacrifice can preserve thousands in allowance.
## Scenario
You earn £100,000 per year. At this exact threshold, your personal allowance begins to taper. For every £2 you earn above £100,000, you lose £1 of personal allowance — creating an effective marginal tax rate of approximately 60% on income between £100,000 and £125,140. Salary sacrifice into a pension is the single most powerful tool for managing this threshold.
This example shows what happens when you sacrifice £12,000 per year to keep your adjusted net income at or below £100,000.
Baseline: £100,000 with no salary sacrifice
| Deduction | Annual | Monthly | |-----------|--------|---------| | Gross salary | £100,000 | £8,333 | | Personal allowance | £12,570 | — | | Taxable income | £87,430 | — | | Income tax: 20% on first £37,700 | £7,540 | £628 | | Income tax: 40% on next £49,730 | £19,892 | £1,658 | | Employee NI: 8% to £50,270, then 2% | £4,011 | £334 | | Take-home pay | £68,557 | £5,713 |
At exactly £100,000 you retain the full personal allowance. But any additional income — even a £1,000 bonus — triggers the taper.
What happens if you earned £112,000
If your salary were £112,000, the taper would remove £6,000 of your personal allowance (half of the £12,000 above £100,000). You would lose £6,000 of the £12,570 allowance, leaving only £6,570. The extra £12,000 of gross income is effectively taxed at approximately 60%:
| | £100,000 | £112,000 | Difference | |---|----------|----------|------------| | Personal allowance | £12,570 | £6,570 | −£6,000 | | Income tax | £27,432 | £34,632 | +£7,200 | | Employee NI | £4,011 | £4,251 | +£240 | | Take-home pay | £68,557 | £73,117 | +£4,560 |
The gross increase is £12,000. The take-home increase is only £4,560 — an effective retention rate of just 38p per pound. That is the 60% tax trap in action.
After £12,000 salary sacrifice on £112,000
Now model what happens if you sacrifice £12,000 of that £112,000 back down to £100,000 adjusted net income:
| Deduction | Without sacrifice (£112k) | With £12k sacrifice (£100k) | |-----------|---------------------------|----------------------------| | Gross taxable pay | £112,000 | £100,000 | | Personal allowance | £6,570 | £12,570 (fully restored) | | Income tax | £34,632 | £27,432 | | Employee NI | £4,251 | £4,011 | | Take-home pay | £73,117 | £68,557 |
Your take-home drops by £4,560. But your pension gains £12,000. The effective cost of that pension contribution is just 38p per pound. Compare this with the basic-rate taxpayer at £50,000, who pays roughly 72p per pound of pension — salary sacrifice is almost twice as efficient at the taper threshold.
The full saving breakdown
| | Annual | |---|--------| | Gross sacrifice | £12,000 | | Income tax saved (40% + taper effect) | £7,200 | | Employee NI saved (2% above £50,270) | £240 | | Actual take-home cost | £4,560 | | Pension value gained | £12,000 | | Effective cost per £1 of pension | 38p |
Your employer also saves NI on the sacrificed amount — at the employer NI rate of 15% (from April 2025), that is an additional £1,800 saving for the employer. Some employers pass part of this saving on through enhanced contribution terms.
When this matters most
This scenario is most relevant if you:
- Earn between £100,000 and £125,140, or expect a bonus or pay rise that would push you above £100,000
- Have not yet explored salary sacrifice as a way to manage the personal allowance taper
- Are comparing a job offer at £105,000-£115,000 and want to understand the real take-home position
- Want to maximise pension value while minimising the real cost to your monthly cash
What the calculator does not capture
The pension annual allowance (£60,000 for most people in 2025-26) limits how much can go into your pension tax-efficiently. If you are contributing through salary sacrifice plus other sources, check you are within the allowance. Above £260,000 adjusted income, the annual allowance itself begins to taper — see a financial adviser for complex high-earner pension planning.
Best next step
Use the salary sacrifice calculator with your exact salary and sacrifice amount. If you are inside the taper zone, read the full 60% tax trap guide for a complete explanation of the mechanism. For a comparison at lower salary levels, see salary sacrifice on £50,000.
How to use PayPath here
Run the relevant calculator for your live numbers, review the methodology if the assumptions matter to your decision, and save the strongest scenarios in the workspace if you are comparing more than one option.