UK Bonus Sacrifice into Pension: 60% Tax Trap Escape 2025/26
Sacrificing a £25,000 bonus into your pension at £105k income saves £15,000+ in the 60% tax trap. Full worked examples, employer NI passback, and how to time bonus sacrifice for 2025/26.
Why the 60% tax trap exists
Between £100,000 and £125,140 of adjusted net income, HMRC removes your £12,570 personal allowance at a rate of £1 for every £2 of income above £100k. That £25,140 band:
- Pays 40% income tax on the income itself.
- Plus another 40% on the £12,570 PA being clawed back — spread across the £25,140 band, that's a 20% extra effective rate.
- Plus 2% NI at the Upper Earnings rate.
Total marginal: 62%. Strip NI and it's a pure 60% income-tax rate.
For every £1,000 of pay in this band, you keep just £380. This is the £100k tax trap in pure form.
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Open Income Tax calculatorHow bonus sacrifice escapes the trap
Bonus sacrifice converts contractual cash that would be taxed into pension contributions that are not taxed. The bonus never appears on your P60 as taxable pay.
The mechanics:
- Before the bonus crystallises, you sign a sacrifice deed with your employer.
- The agreed amount is paid into your pension scheme as an employer contribution.
- PAYE sees a smaller bonus (or none) — only the residual cash is taxed.
- Adjusted net income falls by the sacrificed amount, restoring some/all of the personal allowance.
Critically, an employer who reclaims their saved 15% NI and adds it to your pension stacks even more in.
Worked example — Tom, £85k base + £25k bonus = £110k
Tom would land at £110,000 adjusted income — squarely in the 60% trap zone.
Option A: Take the £25k bonus as cash
| Item | £ |
|---|---|
| Income tax (40% + 20% PA loss) | £15,000 |
| Employee NI (2%) | £500 |
| Net bonus in pocket | £9,500 |
Effective tax rate on the bonus: 62%.
Option B: Sacrifice the entire £25k into pension
| Item | £ |
|---|---|
| Bonus paid | £0 |
| Pension contribution (employer) | £25,000 |
| Cash in pocket | £0 |
Cost to Tom: £9,500 of foregone net pay → £25,000 of pension wealth.
That's a 2.63× uplift before any growth. If the employer also passes back saved employer NI of £25,000 × 15% = £3,750, the pension lands £28,750 for £9,500 of foregone net pay — a 3.03× uplift.
Over 25 years at 5% real growth, that £28,750 becomes £97,500 in today's money.
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Pension calculatorWorked example — Priya, £140k all-in, £40k bonus
Priya's salary is £100k + £40k bonus. She's above the trap floor (£100k) and her bonus pushes her past the trap top (£125,140) into pure 40% land.
Sacrificing just £25,140 of her £40k bonus restores her full personal allowance:
- Adjusted income drops from £140k to £114,860 — still partially in trap.
- Better: sacrifice the full £40k.
Full £40k sacrificed:
- Adjusted income drops to £100,000 — full PA restored.
- Tax avoided on the £25,140 PA-trap slice at 60% = £15,084.
- Tax avoided on the £14,860 above £125,140 at 47% (45% + 2% NI) = £6,984.
- Total tax + NI saved: £22,068.
- Cost to Priya: £17,932 of foregone net pay → £40,000 of pension (2.23×).
Salary Sacrifice Calculator
Calculate how much tax and National Insurance you save by making salary sacrifice contributions to a pension, cycle to work scheme or EV car scheme.
Salary sacrifice calculatorThree rules to make it work
Rule 1: Sacrifice must be agreed BEFORE entitlement crystallises
HMRC's anti-avoidance rule: if you're already contractually entitled to the bonus (e.g. it's been announced and signed off), you cannot retrospectively redirect it. Most employers run a sacrifice window 4-8 weeks before bonus payment date.
Get your HR / payroll process documented in writing.
Rule 2: Check the pension annual allowance
Standard AA 2025/26: £60,000. If your sacrifice + employer contributions + ongoing AVCs would exceed this, you face an annual allowance charge at your marginal rate.
Carry-forward: unused AA from the past three tax years can stack — see pension carry-forward. Potentially £240,000 total in one year if you've been a scheme member throughout.
Rule 3: Watch the tapering trigger at £260k
If sacrificing your bonus brings adjusted income below £200k (threshold income gate), tapering can't apply — clean. If both gates are above the limits, AA reduces to as little as £10,000 — see pension tapering 260k threshold.
The employer-NI passback play
When you sacrifice salary or bonus, your employer saves 15% employer NI in 2025/26. Many large UK employers (especially in tech, finance, professional services) pass that saving back into your pension as an extra contribution.
On Tom's £25,000 sacrifice: employer saves £3,750 NI; standard policy at firms like Deloitte, PwC, Goldman Sachs, Unilever is to add the full £3,750 to the pension. Free 15% boost on every sacrifice.
Always ask HR: "Do we pass back employer NI on salary/bonus sacrifice?"
Other side-effects to consider
| Side-effect | Direction | Magnitude |
|---|---|---|
| Mortgage borrowing capacity | Down | Lenders use net pay — can reduce 4.5× capacity. Some accept "salary plus pension contribution" — confirm. |
| Statutory benefits (SMP, SSP, redundancy) | Down | Calculated on reduced gross. Pause sacrifice in pregnancy. |
| Workplace life cover | Sometimes affected | Usually based on notional salary; check policy. |
| Bonus-linked variable pay | Neutral | Most schemes calculate next year's bonus on notional pre-sacrifice salary. |
| State Pension qualifying years | Almost never affected | Only if sacrifice drops you below the £6,396 LEL — unusual. |
Timing within the tax year
Bonus sacrifice is a tax-year transaction. If your bonus pays in March (most common UK bonus month), sign sacrifice in January. If it pays in April after the new tax year, the contribution counts against the new year's AA — useful if you've already used the current year's allowance.
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Salary Sacrifice Calculator
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Salary sacrifice calculatorTake-Home Pay Calculator
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Frequently asked questions
What is bonus sacrifice?
A formal contractual arrangement in which you give up some or all of an upcoming bonus in exchange for an equivalent employer pension contribution. The bonus is never paid as salary, so no income tax or National Insurance is deducted — the full amount lands in your pension.
Why is the 60% tax trap escape so valuable?
Between £100,000 and £125,140 of adjusted income, your personal allowance tapers away creating a 60% effective tax rate (62% with NI). Sacrificing a bonus that would land in this band saves not just 40% income tax but also the lost allowance — a true 60% saving.
Can my employer refuse bonus sacrifice?
Yes — it is voluntary on both sides and requires an agreed sacrifice deed. Most large UK employers run formal bonus sacrifice windows (often 4-8 weeks before bonus payment date). Smaller employers may decline due to admin or payroll software limits.
Does bonus sacrifice affect mortgage applications?
Your declared 'pensionable salary' may rise; your taxable income falls. Mortgage lenders increasingly accept gross of pension salary on declaration. If sacrifice drops your declared income, time the sacrifice after a mortgage offer is held.
Is there a limit on bonus sacrifice?
The pension annual allowance: £60,000 in 2025/26, plus up to three years of carry-forward (potentially up to £180,000 extra). Sacrificing beyond your AA triggers an annual allowance charge at your marginal rate — so check tapering at £260k adjusted income.
Try the calculators
Take-Home Pay Calculator
Calculate your net salary after income tax, National Insurance and student loan deductions.
Income Tax Calculator
Work out how much income tax you owe using the latest 2025/26 UK tax bands.
Pension Calculator
Estimate your pension pot at retirement and projected annual income.
Salary Sacrifice Calculator
Calculate how much tax and National Insurance you save by making salary sacrifice contributions to a pension, cycle to work scheme or EV car scheme.
In-depth guides
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