Salary sacrifice is an arrangement between you and your employer where you give up part of your salary in exchange for a larger employer pension contribution of the same value. Because the sacrificed amount never appears as salary, it escapes both Income Tax and National Insurance — making it one of the most tax-efficient ways to save into a pension for most employees.
How it works
Instead of you paying, say, £200 a month into your pension from your take-home pay, you agree to reduce your contractual salary by £200 and your employer pays that £200 (plus, often, some or all of their own NI saving) straight into your pension as an employer contribution. Your gross salary on paper is lower, which is why it needs a formal contract variation, but your pension pot grows by the same or a larger amount than if you'd contributed normally.
Why it saves money
A normal employee pension contribution comes out of your pay after National Insurance has already been deducted (tax relief is added separately). Under salary sacrifice, the amount never counts as your salary at all, so:
- You avoid paying Income Tax on that portion, just as with normal pension contributions
- You avoid paying employee National Insurance on it too — normally 8% for most earners
- Your employer avoids paying employer National Insurance (currently around 15%) on it, and many employers pass some or all of that saving into your pension as an extra contribution
Worked example
| Normal contribution | Salary sacrifice | |
|---|---|---|
| Monthly amount sacrificed/contributed | £200 | £200 |
| Employee NI saved (8%) | £0 | £16 |
| Employer NI saved and passed on (illustrative) | £0 | Up to ~£30 |
| Net cost/benefit | £200 leaves your take-home pay | Lower cost to you, and potentially a bigger pension pot if the employer passes on their saving |
Who it suits — and who should be careful
Salary sacrifice works well for most employees on a steady salary above the National Minimum Wage with room to spare, and it's especially valuable for higher earners trying to avoid the tapering of the Personal Allowance above £100,000 of income, or those close to the higher-rate tax threshold. However, because your official salary reduces, it can affect other things calculated from salary:
- Mortgage applications, which often use payslip salary as evidence of income
- Statutory Maternity Pay and other benefits calculated from average earnings
- Life insurance or income protection cover linked to salary multiples
- You must not be sacrificed below the National Minimum Wage — employers won't allow this
Common misconceptions
Some people assume salary sacrifice contributions still count as "personal" contributions eligible for separate tax relief claims — they don't, because you never paid tax on the money in the first place, so there's nothing to reclaim. It's also worth knowing that salary sacrifice contributions still count towards your pension Annual Allowance in the same way as any other contribution, so very high earners or those who've already flexibly accessed a pension (triggering the Money Purchase Annual Allowance) need to watch the limits.
What to do next
Ask your employer whether they offer salary sacrifice and, importantly, whether they pass on any of their NI saving into your pension — this varies a lot between employers. If you're planning a mortgage application or rely on salary-linked benefits, check with your employer or a mortgage adviser how a lower payslip salary might be treated before opting in.