Salary sacrifice for pensions is one of the few remaining tax breaks that's genuinely available to most employed people — yet a huge number of workers either don't use it or don't realise they're already using it without understanding the benefits.
What salary sacrifice actually means
Under salary sacrifice, you and your employer agree to reduce your contractual salary by the amount of your pension contribution. Your employer then pays that amount directly into your pension. The result: your taxable income and your NI-liable income both go down.
This is different from the more common "net pay" arrangement (where the pension comes out before tax but after NI) or "relief at source" (where contributions come out of your take-home and your pension provider adds basic rate tax relief).
The numbers at different income levels
Here's what a 5% employee contribution looks like under three different methods for a £40,000 salary:
| Method | Effective cost to you | Monthly saving vs. Relief at Source |
|---|---|---|
| Relief at Source | £133.33/month | Baseline |
| Net Pay | £133.33/month | £0 (same tax saving, different timing) |
| Salary Sacrifice | £109.67/month | +£23.66/month saved |
The salary sacrifice is cheaper because you also save National Insurance on the contribution (8% at this income level) — which relief at source and net pay arrangements do not give you.
At a higher income, the saving is bigger
If you earn £60,000 and make a 5% contribution (£3,000/year), salary sacrifice saves you:
- £600 in basic rate income tax (20% on £3,000)
- £600 in higher rate income tax (the salary sacrifice keeps more below the 40% threshold)
- £60 in NI (2% above the Upper Earnings Limit)
Total annual saving: ~£1,260 vs doing nothing. The pension contribution costs you about £145/month instead of £250/month.
How to check if your employer offers it
Look at your payslip. If your gross pay shows a pension deduction before the tax calculation, or if the pension line reduces your "taxable pay" column, you're likely already on salary sacrifice. Ask your HR team to confirm.
If your employer doesn't offer it, it's worth requesting — it also saves them employer NI (13.8% on the contribution), so many employers will pass some or all of that saving to you as an extra contribution.
Use our pension deduction explainer to understand exactly what's coming out of your payslip and whether switching to salary sacrifice would save you money.