How Does Salary Sacrifice Work? UK Guide & Examples 2026/27

By Eternity Accountants Editorial Team · Reviewed by Shamayun Chowdhury, Senior Accountant · Published: 7 November 2026 · Last reviewed: November 2026 · Applies to the 2026/27 tax year

Salary sacrifice is one of the few legal ways an employee can cut both Income Tax and National Insurance at the same time. It is most often used for workplace pensions, but it also sits behind cycle to work schemes and electric car deals. Yet many people sign up without knowing what they are actually giving up.

So, how does salary sacrifice work in practice? This guide explains the mechanics step by step, shows the savings with worked examples at 2026/27 rates, sets out the risks, and explains the £2,000 National Insurance cap on pension sacrifice due from April 2029.

How Does Salary Sacrifice Work?

HMRC’s salary sacrifice guidance for employers describes it as an agreement to reduce an employee’s entitlement to cash pay, usually in return for a non-cash benefit. The key word is contract. You are not paying for something out of your wages; you are agreeing to a smaller salary and a benefit in its place.

Because tax and National Insurance are worked out on your cash pay, a lower salary means smaller deductions. If the benefit itself is tax-free, such as an employer pension contribution, the whole saving stays with you and your employer.

How does salary sacrifice work step by step?

1. Your employer offers a scheme. You cannot set one up yourself.
2. You agree to a contract change. Your new contract shows your lower cash salary and the benefit you get instead.
3. Payroll reduces your gross pay. Income Tax and National Insurance are then calculated on the lower figure.
4. Your employer provides the benefit. For a pension, it pays the sacrificed amount straight into your pot as an employer contribution.

HMRC expects the change to be real. If you can swap back to cash whenever you like, the tax and National Insurance savings may not apply. Most schemes let you join or leave once a year, or after a lifestyle event such as marriage, divorce or pregnancy.

What You Can Sacrifice Salary For

How does salary sacrifice work for benefits other than pensions? Since April 2017, most benefits taken through salary sacrifice are taxed on the higher of the salary given up or the normal benefit-in-kind value, which removes the saving. HMRC’s policy paper on limiting salary sacrifice lists the benefits that kept their advantages:

• Employer pension contributions and pensions advice
• Cycle to work schemes
• Ultra-low emission cars emitting 75g CO2/km or less, including fully electric cars
• Workplace nurseries and, for people who joined before 4 October 2018, childcare vouchers

How Does Salary Sacrifice Work for Pensions?

A salary sacrifice pension is by far the most common arrangement. Instead of paying into your pension from your wages, you give up that amount of salary and your employer pays it in for you. Employer pension contributions are free of Income Tax and National Insurance, so the whole amount reaches your pot.

Many employers also pass on some or all of their own 15% National Insurance saving as an extra pension contribution. Ask your HR or payroll team whether yours does, as it can noticeably boost your pot.

Salary sacrifice vs net pay vs relief at source

There are three ways your pension contributions can get tax relief. Knowing which one your workplace uses helps explain how salary sacrifice works differently.

The difference that matters is National Insurance. With net pay or relief at source, you still pay National Insurance on the money going into your pension. With salary sacrifice, you do not, which is why it usually leaves you better off.

Salary Sacrifice Worked Examples for 2026/27

To answer “how does salary sacrifice work?” with real numbers, these examples use 2026/27 rates for England and Northern Ireland: 20% basic rate and 40% higher rate Income Tax, employee National Insurance of 8% up to £50,270 and 2% above, and employer National Insurance of 15%.

Example 1: Basic-rate taxpayer

Sarah earns £35,000 and sacrifices 5%, which is £1,750, into her pension. She saves £350 in Income Tax and £140 in National Insurance, so her take-home pay falls by only £1,260. Her employer saves £262.50 in National Insurance.

Under relief at source, the same £1,750 contribution would have cost Sarah £1,400 from her net pay. Salary sacrifice leaves her £140 a year better off for an identical pension contribution.

Example 2: Higher-rate taxpayer with Child Benefit

James earns £65,000 and sacrifices £6,000. He saves £2,400 in Income Tax and £120 in National Insurance, so his take-home pay falls by £3,480. His employer saves £900.

There is a bonus too. His adjusted net income drops to £59,000, below the £60,000 point where the High Income Child Benefit Charge starts. If his partner earns less than he does, the family keeps all its Child Benefit.

Example 3: Escaping the 60% tax trap

Priya earns £110,000. Between £100,000 and £125,140, she loses £1 of Personal Allowance for every £2 of income. By sacrificing £10,000, her adjusted net income falls to £100,000 and her full allowance returns. She saves about £6,000 in Income Tax and £200 in National Insurance, so £10,000 reaches her pension for a take-home cost of around £3,800.

Cycle to Work, Electric Cars and Childcare

How does salary sacrifice work outside pensions? The same principle of giving up pay for a benefit applies to several other schemes.

How does salary sacrifice work for cycle to work schemes?

Your employer buys or hires a bike and equipment, and you repay the cost through salary sacrifice over an agreed period. A basic-rate taxpayer saves 28% (20% tax plus 8% National Insurance), so a £1,200 bike costs about £864. A higher-rate taxpayer saves around 42%.

How does salary sacrifice work for an electric car?

Electric cars are taxed on a low benefit-in-kind rate, 4% of the list price for 2026/27. You sacrifice salary to cover the lease, which often includes insurance and maintenance. The benefit-in-kind charge is far smaller than the tax you save, which is why electric car salary sacrifice has become so popular.

Childcare

Childcare vouchers closed to new joiners on 4 October 2018, although existing members can carry on. Most parents now use Tax-Free Childcare instead, which is not a salary sacrifice scheme. Workplace nurseries can still be offered through salary sacrifice.

Pros and Cons of Salary Sacrifice

Who Should Be Careful With Salary Sacrifice

Understanding how salary sacrifice works also means knowing when it can backfire. Check these points before you sign.

Low earners and the minimum wage

Your cash pay after the sacrifice must not fall below the National Minimum Wage. From 1 April 2026, the National Living Wage is £12.71 an hour for workers aged 21 and over. Employers must cap sacrifices so this never happens.

Statutory pay and state benefits

Statutory Maternity Pay and other statutory payments are based on average earnings. If your sacrificed salary drops below the lower earnings limit, you may lose them entirely. Some earnings-related benefits, such as Maternity Allowance, can also be reduced.

Mortgages and life cover

Some lenders look at your reduced salary rather than your pre-sacrifice pay. If you are about to remortgage, ask your lender how it treats salary sacrifice. Also check whether death-in-service cover and pay rises are worked out on your original salary.

How Does Salary Sacrifice Work After the 2029 Changes?

In the Autumn Budget on 26 November 2025, the government announced a cap on the National Insurance advantage. According to HM Treasury’s guidance on the April 2029 changes, only the first £2,000 a year of pension contributions made through salary sacrifice will be exempt from National Insurance.

• Income Tax relief continues on the full amount, within the usual pension limits.
• Employee and employer National Insurance will be due on salary sacrifice pension contributions above £2,000.
• Ordinary employer pension contributions stay free of National Insurance.
• Cycle to work and electric car schemes are not affected by this cap.

For James in Example 2, £4,000 of his £6,000 sacrifice would be above the cap. He would pay about £80 more National Insurance a year, and his employer about £600 more. Salary sacrifice would still save him far more than it costs, thanks to the Income Tax relief.

In short, how does salary sacrifice work after 2029? Much as it does now, with a slightly smaller National Insurance saving on larger pension contributions.

How to Set Up a Salary Sacrifice Scheme

For employers, how does salary sacrifice work in practice? It needs more care than a simple payroll tweak. These are the main steps:

1. Decide which benefits to offer and check each one is still tax-efficient after the 2017 rules.
2. Issue a written contract variation for every employee who joins or leaves.
3. Build a minimum wage check into payroll so no sacrifice takes cash pay too low.
4. Report non-exempt benefits correctly, for example on a P11D, and prepare for 2029 payroll reporting.

If you run a small business and want help setting up a scheme or running the payroll side, our micro business owners tax services cover salary sacrifice alongside your wider tax position.

Frequently Asked Questions

Is a salary sacrifice pension worth it?

For most employees, yes. You save Income Tax and National Insurance on money you would put into a pension anyway. It is less suitable if you earn close to the minimum wage, are planning maternity leave, or are about to apply for a mortgage.

Does salary sacrifice reduce my take-home pay?

Yes, but by less than the amount you sacrifice. A basic-rate taxpayer who sacrifices £100 typically sees take-home pay fall by about £72, because they save £20 in Income Tax and £8 in National Insurance.

How does salary sacrifice work on a payslip?

Your payslip shows a lower gross salary, or a salary sacrifice deduction taken before Income Tax and National Insurance. Your pension statement then shows the sacrificed amount as an employer contribution.

Can I stop salary sacrifice at any time?

Usually not. HMRC expects the arrangement to be a genuine contract change, so most schemes only let you join or leave once a year or after a lifestyle event such as marriage, divorce or pregnancy. Check your scheme rules.

Does salary sacrifice affect my State Pension?

Usually not, as long as your earnings stay above the lower earnings limit for National Insurance. Below that level, you may not build qualifying years for the State Pension, which is another reason employers cap sacrifices.

Is salary sacrifice being scrapped in 2029?

No. Salary sacrifice will continue. From April 2029, pension contributions made through salary sacrifice above £2,000 a year will attract National Insurance, but full Income Tax relief remains.

Does salary sacrifice reduce my adjusted net income?

Yes. Because your salary is lower, your adjusted net income falls too. That can help you avoid the High Income Child Benefit Charge, keep Tax-Free Childcare or restore your Personal Allowance above £100,000.

Final Verdict: How Does Salary Sacrifice Work for You?

So, how does salary sacrifice work for you? It swaps some of your salary for a benefit, and the tax and National Insurance you save make that benefit cheaper than paying for it from your net pay. For pensions, it is one of the most efficient savings tools available. Check your minimum wage position, statutory pay and mortgage plans first, and keep the 2029 cap in mind.