Salary Sacrifice Pensions Explained: How Much You Save (UK)

A salary sacrifice pension works like this: you agree to a lower salary and your employer pays the difference into your pension. Because your pay is lower, you save both Income Tax and National Insurance on the contribution. Other pension schemes only save Income Tax.

Three ways UK pension contributions are taken

• Net pay arrangement: the contribution is taken before Income Tax, but National Insurance is still charged on it.
• Relief at source: you pay from taxed income and your pension provider claims 20% basic-rate relief. Higher-rate taxpayers claim the rest through Self Assessment.
• Salary sacrifice: your contractual salary goes down, so both Income Tax and National Insurance fall.

How much salary sacrifice saves

Real cost of a 5% pension contribution in England:

Salary	5% contribution	Cost with net pay	Cost with salary sacrifice	Extra NI saved
£30,000	£1,500	£1,200	£1,080	£120
£40,000	£2,000	£1,600	£1,440	£160
£60,000	£3,000	£1,800	£1,740	£60

“Cost” is the reduction in your take-home pay for the year. Many employers also pass on some of their own National Insurance saving (15%) as a bonus contribution.

Things to check before you sign up

• Minimum wage: your reduced salary cannot fall below the National Minimum or Living Wage.
• Mortgages: some lenders use your post-sacrifice salary.
• Benefits: statutory maternity pay and some benefits are based on earnings.
• Life cover linked to salary may use the lower figure.

Other salary sacrifice schemes

The same mechanism is used for cycle-to-work schemes, electric car leases and some childcare arrangements.

A worked example

Take a £40,000 salary and a 5% pension contribution (£2,000). Under a net pay arrangement, Income Tax relief at 20% means the contribution costs you £1,600. With salary sacrifice, you also save 8% National Insurance (£160), so it costs you only about £1,440. If your employer adds part of its own NI saving, your pension grows even faster.

Higher-rate taxpayers

For higher-rate taxpayers, salary sacrifice saves 40% Income Tax plus 2% National Insurance on contributions. It can also bring your adjusted net income below £60,000 (reducing the High Income Child Benefit Charge) or £100,000 (protecting your Personal Allowance).

Relief at source: don’t miss out

If your pension uses relief at source, your provider only adds 20% relief. Higher and additional-rate taxpayers must claim the rest through Self Assessment or by contacting HMRC. Many people never claim it and lose hundreds of pounds a year.

How to change your arrangement

Salary sacrifice has to be offered by your employer and agreed in writing, and changes are usually allowed once a year or after a life event. Ask your HR or payroll team what your scheme uses and whether salary sacrifice is available.

See what any pension rate does to your pay with the UK take-home pay calculator or read our guide to National Insurance rates.

Is a salary sacrifice pension right for you? A step-by-step check

Before you ask your employer to switch, work through these checks. They take a few minutes and stop most of the surprises people run into after signing up.

1. Find out which method your scheme uses. Your payslip or pension provider will show whether contributions are taken under net pay, relief at source or salary sacrifice.
2. Work out your reduced salary. On £30,000 with a 5% contribution, your contractual salary becomes £28,500. Make sure it stays above the National Minimum or Living Wage for your hours.
3. Compare the real cost. In the table above, the same £1,500 contribution costs £1,200 under net pay but only £1,080 through a salary sacrifice pension, because you also avoid 8% National Insurance.
4. Ask about the employer NI saving. Your employer saves 15% National Insurance on the sacrificed amount, which is up to £225 on £1,500. Some employers add all or part of it to your pension.
5. Think about the year ahead. If you plan to apply for a mortgage or take maternity leave, check how the lower salary will be treated first.

Common mistakes to avoid

• Assuming a salary sacrifice pension means a smaller pot: the amount going into your pot is the same or higher, only your payslip salary changes.
• Forgetting that a salary sacrifice pension can also lower student loan repayments, since they are based on your reduced pay.
• Not updating the figure you give to lenders or letting agents, who may ask for your salary after sacrifice.

HMRC explains the different types of pension tax relief on gov.uk. If you are close to the £60,000 or £100,000 thresholds, or unsure whether a salary sacrifice pension suits you, a regulated financial adviser can model the options with your own numbers.

Frequently asked questions

Estimates for information only, not tax advice.