Salary Sacrifice Pensions Explained
Salary sacrifice is the most tax-efficient way most employees can pay into a pension, yet plenty of people who are offered it never switch it on. The idea sounds odd, give up part of your salary, but the result is the same money going into your pension while you keep more of your take-home pay.
How it works
With normal pension contributions, money is taken from your pay and put into your pension. With salary sacrifice (some employers call it salary exchange or smart pension), you formally agree to a lower salary, and your employer pays the difference straight into your pension as an employer contribution.
Why bother with the paperwork? National Insurance. Your NI is calculated on your salary, so a lower salary means a smaller NI bill. Normal pension contributions do not reduce your NI; sacrificed salary does. You get full income tax relief either way, but salary sacrifice adds an NI saving on top.
What the saving is worth
In 2026/27, employees pay 8% National Insurance on earnings between £12,570 and £50,270, and 2% above that (source: GOV.UK rates and thresholds for employers 2026/27). So the saving depends on where your salary sits.
| You sacrifice £2,000 a year | Earnings band | NI saved per year |
|---|---|---|
| Basic-rate earner (£35,000) | 8% band | £160 |
| Higher earner (£60,000) | 2% band | £40 |
That is on top of the income tax relief every pension contribution gets. Your employer saves too: employer NI is 15% on pay above £5,000 in 2026/27, so your £2,000 sacrifice saves them £300. Many employers pass some or all of that saving into your pension as well, which is worth asking about, because it is free money on top of free money.
A quieter benefit for higher earners
Because sacrificed salary never reaches you, you get your full tax relief automatically through payroll. There is no extra 20% or 25% to remember to claim from HMRC, which is where relief at source schemes catch higher-rate taxpayers out.
The catches
Salary sacrifice means your official salary really is lower, and a few things key off that number:
- Borrowing. Mortgage lenders assess your reduced salary. If you are about to apply for a mortgage, time your sacrifice level carefully.
- Statutory payments. Statutory maternity, paternity and sick pay are based on your actual (lower) earnings.
- Life cover and bonuses. Anything your employer calculates as a multiple of salary may shrink unless they use a notional pre-sacrifice figure. Ask how yours handles it.
- The minimum wage floor. Your employer cannot let sacrifice take your pay below the National Minimum Wage, so lower earners may be capped.
None of these are reasons to avoid salary sacrifice for most people, but they are worth checking before you sign the agreement.
See what the extra contributions become
An NI saving recycled into your pension compounds for decades. Put your numbers into our free calculator and see the difference at retirement.
Try the calculator →The £2,000 cap from April 2029
The November 2025 Budget announced that from 6 April 2029, only the first £2,000 of salary sacrificed into a pension each year will stay exempt from National Insurance. Anything above £2,000 will attract employee and employer NI, though income tax relief is untouched (source: GOV.UK, Changes to salary sacrifice for pensions from April 2029).
What this means in practice: sacrifice up to £2,000 a year and nothing changes for you, ever. Sacrifice more, and from April 2029 the excess loses its NI advantage but keeps full tax relief, so it simply becomes as good as a normal contribution rather than better. There is no scenario where contributing less is the right response to this change. If you sacrifice heavily, the sensible move is a fresh comparison of your options closer to 2029.
How to set it up
- Ask your payroll or HR team whether they offer salary sacrifice for pensions. Many schemes have it available but not switched on by default.
- Ask whether the employer passes on any of their 15% NI saving.
- Check the catches above against your circumstances, especially if a mortgage application or parental leave is coming up.
- You will sign a variation to your employment contract; you can usually change the amount at set points in the year or after life events.
This article is for general information only and does not constitute financial advice. Figures relate to the 2026/27 tax year and are correct as of July 2026; National Insurance rates and the April 2029 changes may be amended before they take effect. Tax treatment depends on your individual circumstances. For advice tailored to you, speak to a financial adviser regulated by the Financial Conduct Authority (FCA), or get free guidance from MoneyHelper.