Salary sacrifice is one of the most tax-efficient perks available to UK employees — yet millions never use it to its full potential. Whether it's boosting your pension, saving on a cycle-to-work scheme, or cutting your childcare costs, the mechanics are simpler than they sound. Here's exactly how it works and what it means for your pay packet in 2026/27.
Salary sacrifice — sometimes called a salary exchange — is an agreement between you and your employer to reduce your contractual gross salary by a set amount. In return, your employer gives you a non-cash benefit of the same value. The arrangement has to be set up properly: it's a formal change to your employment contract, not just an informal deduction.
The most common use is pension contributions. If you earn £35,000 and sacrifice £3,000 into your workplace pension, HMRC treats your salary as £32,000. You pay Income Tax and National Insurance (NI) on £32,000, not £35,000. That difference is where the saving comes from. Other qualifying benefits include cycle-to-work bikes, electric vehicles via a company car scheme, and employer-supported childcare vouchers (for existing pre-October 2018 schemes).
Your employer also saves money — they no longer pay their 13.8% employer NI on the sacrificed portion. Many employers pass some or all of that saving back to employees as an extra pension contribution, which makes the deal even sweeter. Always check your employer's policy, because some are more generous than others.
The savings depend on your tax band, but they're meaningful at every level. Take a basic-rate taxpayer earning £30,000 who sacrifices £150 a month (£1,800 a year) into their pension. Their take-home pay doesn't drop by £150 — it drops by roughly £111, because they're no longer paying 20% Income Tax and 8% employee NI on that £150. The other £39 goes straight into their pension rather than to HMRC.
Higher-rate taxpayers save even more. On the same £150/month sacrifice, someone paying 40% tax and 2% NI would see their monthly pay fall by only about £87 — meaning £63 of every £150 that would have gone in tax now goes into their pension instead. Over a working lifetime, that kind of compounding matters enormously.
There are limits to watch. You can't sacrifice your salary below the National Living Wage (£12.21/hour for over-21s in 2026/27), and pension contributions are capped at the Annual Allowance of £60,000 per year (or 100% of your earnings if lower). If you earn over £260,000 your tapered annual allowance will be lower — worth checking with a financial adviser.
Salary sacrifice isn't completely without drawbacks, and it's worth knowing them before you sign anything. Because your official salary is lower, some things that depend on earnings can be affected. Mortgage lenders typically use your contracted salary when calculating how much they'll lend, so sacrificing a large chunk could reduce your borrowing capacity. It's worth getting written confirmation of your full salary from your employer if you're applying for a mortgage.
State benefits linked to earnings — such as Statutory Maternity Pay, Statutory Sick Pay, and your State Pension entitlement — are calculated on your reduced salary. For most people the difference is small, but if you're planning a career break or expecting a baby, do the sums first. The State Pension specifically requires National Insurance contributions on earnings above the Lower Earnings Limit (£6,500 in 2026/27), so your entitlement is safe unless your sacrificed salary drops below that threshold.
Finally, salary sacrifice schemes must be agreed with your employer — you can't set one up unilaterally. Not every employer offers them, and some only allow changes at certain points in the year. If yours does offer a scheme, though, it's almost always worth taking a close look. The tax savings are real, legal, and HMRC-approved.
Yes, but by less than the sacrificed amount. If you sacrifice £100 a month and you're a basic-rate taxpayer, your take-home typically falls by around £74 — the rest was going to HMRC as tax and NI anyway.
Yes. Salary sacrifice is entirely at your employer's discretion. They are not legally required to offer it, and some smaller employers choose not to because of the administration involved.
It can. Lenders usually base affordability on your contracted salary, which is lower after sacrifice. Ask your employer for a letter confirming your full salary before salary sacrifice — most lenders will accept this.
Not exactly. A standard pension contribution is deducted after tax is calculated, so you only get tax relief. With salary sacrifice, the contribution is deducted before tax, so you also save on National Insurance — making it more efficient.
The most common HMRC-approved benefits are pension contributions, cycle-to-work bikes and equipment, electric company cars (via an EV scheme), and workplace nursery places. Childcare voucher schemes closed to new entrants in 2018 but existing members can still use them.
For pensions, the Annual Allowance is £60,000 (or 100% of your earnings, whichever is lower) for 2026/27. You also cannot sacrifice your salary below the National Living Wage. High earners above £260,000 have a tapered allowance — seek advice if that applies to you.