Salary sacrifice is an arrangement where you give up part of your gross salary in exchange for a non-cash benefit, such as extra pension contributions or an electric car. Because the money leaves your pay before tax, you cut both income tax and National Insurance. Your employer runs it through payroll, so you never see the sacrificed amount hit your bank account.
The saving comes from the order of operations. Normally you're taxed first and spend what's left. With salary sacrifice you spend first, then pay tax and National Insurance only on the lower salary that remains.
How salary sacrifice cuts tax and National Insurance
Your contract is formally varied so your gross salary drops. In return, your employer funds the benefit directly. HMRC treats the lower figure as your real salary for income tax and National Insurance.
Take a basic-rate taxpayer sacrificing £1,000 into their pension. They'd have paid 20% income tax and 8% employee National Insurance on that slice in 2026/27. That's £280 saved, so a £1,000 pension contribution costs them just £720 in take-home terms.
Higher-rate taxpayers do even better. Above £50,270 you pay 40% tax but only 2% National Insurance, so £1,000 sacrificed costs roughly £580 of take-home pay. Many employers also pass on some of their own 15% National Insurance saving as a bonus contribution — always ask, because it's not automatic.
Pension salary sacrifice: the biggest win
Pension is where salary sacrifice really shines. Every pound goes in gross, and you dodge National Insurance that you'd never recover through a normal relief-at-source pension. It's genuinely the most tax-efficient way most employees can save for retirement.
You're bound by the pension annual allowance, which stays at £60,000 for 2026/27 (including employer contributions). Sacrifice beyond that and you could face an annual allowance charge. High earners should also watch the tapered allowance, which can shrink to as little as £10,000 once adjusted income passes £260,000.
One practical tip: sacrificing into your pension lowers your adjusted net income. That can help you keep Child Benefit, dodge the 60% effective rate in the £100,000–£125,140 band, or protect your personal allowance. It's a quiet way to reclaim money the tax system tries to take back.
Salary sacrifice for electric cars (EV schemes)
Electric car schemes have exploded because the tax break is huge. You sacrifice salary and get a leased EV in return, insurance and servicing usually bundled in. The benefit-in-kind (BIK) rate on fully electric cars is just 4% for the 2026/27 tax year.
Compare that to a petrol car taxed at 25–37% BIK and the maths is obvious. A 40% taxpayer can often run a brand-new EV for a fraction of a personal lease, once tax and National Insurance savings are counted. That's why EV salary sacrifice has become the headline perk at many UK employers.
Be aware the electric BIK rate is legislated to rise by a percentage point a year: it was 3% in 2025/26, is 4% in 2026/27 and goes to 5% in 2027/28. The deal gets slightly less generous each year, though it is still strong. Check whether early termination fees apply if you leave your job, because you usually hand the car back.
The effect on take-home pay and borrowing
Your net pay falls, but by less than the amount sacrificed, because tax and National Insurance drop too. That gap is the saving. Our salary sacrifice calculator shows the exact figures for your salary and contribution.
There's a catch worth flagging: lenders assess mortgages on your reduced gross salary. Sacrifice £6,000 a year and a bank may lend you around 4.5 times less on that slice — potentially £27,000 off your borrowing limit. If you're buying soon, some people pause pension sacrifice for a few months first.
Statutory benefits can also shift. Maternity pay, sick pay and life cover are sometimes based on the lower salary, though good employers use reference pay to protect these. It's the sort of detail you only learn by reading the scheme rules carefully.
The pitfalls to watch
Salary sacrifice can't take you below the National Minimum Wage — that's a hard legal floor, so lower earners have limited room. It's largely a middle and higher earner's tool.
You also can't chop and change on a whim. HMRC expects the salary variation to be a genuine contractual change, usually reviewable once a year or on a "lifestyle event" like a new baby or moving house. And remember, sacrificed pension money is locked away until at least age 55 (rising to 57 from 2028).
Context matters here. With frozen tax thresholds dragging more people into higher-rate bands through fiscal drag, salary sacrifice has become one of the few legitimate levers left. The ONS put median full-time pay at around £37,430 in its 2024 Annual Survey of Hours and Earnings, meaning a growing share of ordinary workers now brush against the £50,270 higher-rate line after a couple of pay rises.
Ready to see your own numbers? Use our salary sacrifice calculator to work out exactly what you'd save on pension or an electric car, and what your new take-home pay would be.
This article is general information, not personalised financial or tax advice. Figures reflect the 2026/27 UK tax year and may change; parts of this content were drafted with AI assistance and reviewed for accuracy. Check GOV.UK or a qualified adviser before acting.