Salary sacrifice explained
Salary sacrifice can cut your tax and National Insurance bill at the same time — here's how it works and when it's worth it.
Written by Jack Dev · Last updated 2 October 2026
What salary sacrifice actually is
Salary sacrifice sounds painful, but it's really just a contractual swap: you agree to take a bit less salary in exchange for something else — usually extra pension contributions, sometimes a cycle-to-work scheme, an electric car lease, or childcare. Because your actual contractual salary drops, that sacrificed chunk never gets taxed or NI'd in the first place.
Compare that with a normal 'net pay' pension contribution, which only sidesteps Income Tax — National Insurance still gets charged on the full amount. Salary sacrifice dodges both.
Why it saves more than a normal pension contribution
Numbers make this clearer. A basic-rate taxpayer paying £100 a month into a pension the normal way saves the 20% tax (£20) but still pays 8% NI on it — so it actually costs them £92 of take-home pay. Do the same £100 through salary sacrifice instead, and it never counts as earnings at all: no 20% tax, no 8% NI. Real cost: £72. Even the employer saves their 15% NI on it, and plenty pass some of that saving straight back into your pension.
Higher-rate taxpayers see a similar story, just with smaller NI savings (the rate drops to 2% above £50,270) offset by a bigger Income Tax saving at 40%.
Where it can also help with the £100,000 and £60,000 traps
Because it genuinely lowers your gross salary — not just your taxable income on paper — salary sacrifice is one of the cleanest ways to duck under thresholds like the £100,000 Personal Allowance taper, or the £60,000 point where Child Benefit starts disappearing. Both are measured after pension contributions, so this actually moves the needle rather than just shuffling numbers around.
Worth reading alongside our guide on how the £100,000 tax trap works if that's the threshold you're trying to dodge.
What to watch out for
It's not free money, though. Sacrificing your salary lowers the 'official' number used for things like mortgage affordability checks, life insurance multiples, statutory maternity pay, and some means-tested benefits — if you're sacrificing a big chunk, it's worth checking what else that number feeds into first. It can also eat into how much pension Annual Allowance you've got left if it pushes you close to the tapered £60,000 limit for high earners.
One more thing: your employer legally can't let salary sacrifice drop your pay below the National Minimum Wage. Most schemes build in a safeguard for this automatically, but it's still worth knowing the rule exists.
Frequently asked questions
Yes — that's the main thing it has over a normal pension contribution. Because your contractual salary genuinely drops, the sacrificed amount avoids both Income Tax and employee NI.
It can. Lenders usually assess affordability on your actual contractual salary, so a large sacrifice can shrink what you're assessed as able to borrow.
Pensions are the most common use by far, but plenty of employers also run it for cycle-to-work schemes, electric car leases, and sometimes childcare.
This guide is general information, not financial or tax advice — check GOV.UK or a qualified adviser for anything that affects a real financial decision.