Comparison · Pay & Pensions · 2026
Salary Sacrifice vs Cash Bonus 2026: Which Is Better?
A bonus lands in your account — but how much of it survives tax? Take a £5,000 bonus as cash and a higher-rate taxpayer keeps barely £2,900 of it after income tax and National Insurance. Sacrifice the same bonus into your pension and the full £5,000 — often more, once the employer NI saving is shared — goes to work for your retirement, with no tax or NI deducted at all. This 2026 comparison weighs the two: the tax and NI saving, the employer NI angle, the powerful £100,000 trap play, and the central trade-off — immediate cash you can spend versus money locked away until age 57.
TL;DR — 30-Second Summary
- • Pure tax efficiency: sacrifice wins every time — no income tax, no NI, plus a shared employer NI boost
- • Need the money now: take the cash — pension money is locked until age 57
- • £5,000 bonus, higher rate: ~£2,900 cash vs £5,000+ in the pension for the same gross
- • Earning £100k–£125,140: sacrificing is exceptional — it dodges the ~60% band and reclaims the Personal Allowance
How Each Option Works
The choice is what happens to the gross bonus before it reaches you.
- • Bonus paid through PAYE like salary
- • Income tax (20%/40%/45%) deducted
- • Employee NI (8% or 2%) deducted
- • Net amount lands in your bank now
- • Fully accessible and flexible
- • Bonus given up before it is earned
- • No income tax, no employee NI
- • Employer saves 15% NI — often added too
- • Full amount invested in your pension
- • Locked until age 57 (58 from 2028)
The Tax and NI Saving
A cash bonus is taxed exactly like salary, so the slice you keep depends entirely on your marginal band. Sacrificing avoids all of it. For a £5,000 bonus in 2026/27:
| Band | Cash bonus: net in pocket | Sacrifice: into pension |
|---|---|---|
| Basic rate (20% + 8%) | ~£3,600 | £5,000+ |
| Higher rate (40% + 2%) | ~£2,900 | £5,000+ |
| £100k–£125,140 (~60% + 2%) | ~£1,900 | £5,000+ |
| Additional rate (45% + 2%) | ~£2,650 | £5,000+ |
The “£5,000+” reflects that many employers add their 15% employer NI saving to your pension, so a £5,000 sacrifice can become £5,750 invested. Model it with the salary sacrifice calculator.
The Employer National Insurance Angle
A cash bonus costs your employer 15% employer NI on top of the bonus itself. Sacrifice that bonus and the employer no longer pays that NI — a genuine saving for the business. Because it costs the employer nothing extra, many run a “bonus exchange” scheme and pass some or all of that 15% into your pension.
That shared employer NI is the structural reason salary sacrifice beats a personal pension contribution made from a cash bonus: a personal contribution recovers the income tax but never the National Insurance, and never the employer NI.
The £100k Trap: Where Sacrifice Shines
If a bonus pushes your adjusted net income between £100,000 and £125,140, you hit the Personal Allowance taper — £1 of allowance lost for every £2 earned — producing an effective marginal rate of around 60% on that slice. Taken as cash, a £5,000 bonus in this band might leave under £1,900.
Sacrificing it into a pension reduces your adjusted net income, restores the lost Personal Allowance and sidesteps the 60% rate entirely. The effective relief can exceed 60% once NI and the reinstated allowance are counted — easily the highest-return use of a bonus for anyone just over £100,000. See the salary sacrifice guide for the mechanics.
Immediate Cash vs Locked-Away Pension
The tax case for sacrifice is overwhelming — but tax is not everything. The real question is liquidity:
- • You need money now (deposit, debt, emergency)
- • You have little accessible savings
- • You are years from retirement age and want flexibility
- • You are a basic-rate taxpayer with modest savings goals
- • You are saving for retirement anyway
- • You are a higher/additional-rate taxpayer
- • You are caught in the £100k–£125,140 band
- • You can leave the money until at least 57
Worked Examples at Each Band
A £5,000 gross bonus, compared as cash versus a pension sacrifice (figures illustrative for 2026/27, assuming the employer keeps its own NI saving):
| Earner | Cash bonus net | In pension if sacrificed | Effective “cost” of pension |
|---|---|---|---|
| £35,000 (basic) | ~£3,600 | £5,000 | £3,600 of forgone cash → £5,000 saved |
| £60,000 (higher) | ~£2,900 | £5,000 | £2,900 of forgone cash → £5,000 saved |
| £110,000 (£100k trap) | ~£1,900 | £5,000 | £1,900 of forgone cash → £5,000 saved |
The pattern is stark: the higher your marginal rate, the cheaper it is to fund your pension by sacrifice. The £110,000 earner gives up under £2,000 of take-home to put £5,000 into a pension — a return no investment can match. The only reason to take the cash is that you need it now. Run your figures with the salary sacrifice calculator and the pension calculator.
Which Should You Choose?
If you do not need the money in the short term and you are a higher-rate taxpayer — and especially if you are caught in the £100,000 trap — sacrificing your bonus into a pension is one of the most efficient financial moves available, easily worth thousands more than taking the cash. If you need liquidity now, or you are a basic-rate taxpayer with pressing short-term goals, the flexibility of cash can justify the tax cost. A common compromise is to sacrifice the portion of the bonus that falls in your highest tax band and take the rest as cash.