Salary sacrifice explained

What it actually is

Salary sacrifice is a change to your employment contract. HMRC describes it as an agreement to reduce your entitlement to cash pay, usually in return for a non-cash benefit. Most often that benefit is an employer pension contribution, but it can also be cycle to work equipment, a low-emission car or a workplace nursery place. The key word is contractual. You are not making a deduction from your pay. Your pay is genuinely lower, and the benefit is provided by your employer.

That distinction is what creates the saving. For a pension, the sacrificed amount never counts as your earnings, so it is outside both income tax and National Insurance. A payslip deduction, by contrast, comes out of money that has already been treated as earnings for at least one of those two.

The saving, with numbers

Take an employee on £45,000 in England, Wales or Northern Ireland who sacrifices £5,000 a year into a pension.

Take-home falls by £3,600, but £5,000 lands in the pension. The effective cost is 72p in the pound, because 20% income tax and 8% National Insurance were both avoided.

The employer saves too. Employer National Insurance is charged at 15% on earnings above the £5,000 secondary threshold in 2026/27, so every £1,000 sacrificed by someone whose pay stays above that threshold saves the employer £150. Some schemes pass part or all of that saving back into the employee's pension. It is worth asking whether yours does.

The Scottish row shows why sacrifice can be worth more north of the border. A £45,000 salary sits in the zone where Scottish higher-rate tax and the full 8% National Insurance rate overlap, so the same £5,000 costs £3,269 rather than £3,600. The overlap is explained in Scottish income tax vs the rest of the UK.

Why it beats the other pension methods

There are three ways a workplace pension contribution can be handled, and only one of them saves National Insurance. Relief at source and net pay arrangements both give income tax relief, but the money is still treated as your earnings for NI purposes, so the 8% or 2% employee National Insurance is charged anyway. Salary sacrifice avoids it. For a basic-rate taxpayer that is worth an extra 8% of everything contributed. We cover the mechanics in pension tax relief: the three methods.

Benefits other than a pension

Salary sacrifice for pensions is treated generously. Most other benefits are not. Under the optional remuneration arrangement rules introduced in April 2017, a benefit you take instead of salary is valued at the higher of the salary you gave up and the normal benefit-in-kind value. If you give up £1,000 of salary for a benefit with a lower benefit-in-kind value, you are still taxed on £1,000, so the income tax saving disappears.

HMRC lists these as outside that higher-of rule:

• payments into pension schemes
• employer-provided pensions advice
• workplace nurseries
• childcare vouchers, for arrangements that started before 4 October 2018
• bicycles and cycling safety equipment, including cycle to work schemes

Cars with CO2 emissions of 75g/km or less are also valued on the normal company car benefit-in-kind rules rather than the salary given up. Anything else, such as gym membership or a higher-emission car, falls under the higher-of rule.

The five things it quietly affects

When it backfires

• You are on or near the minimum wage, where the floor leaves almost nothing to sacrifice.
• You are planning a baby and your average weekly earnings would drop close to £129 a week during the statutory pay calculation period.
• You need the cash. Money in a pension is normally locked until age 55, rising to 57 from 6 April 2028, and no amount of tax efficiency helps if you cannot pay the rent.
• You are already at the pension annual allowance, or your allowance is tapered because of very high income. Contributions above the allowance are clawed back through an annual allowance charge.
• You are applying for a mortgage and your lender takes contractual salary at face value.

The April 2029 National Insurance cap

The government announced at Budget 2025 that the National Insurance advantage on pension salary sacrifice will be capped, and the change is now law. The National Insurance Contributions (Employer Pensions Contributions) Act 2026 received Royal Assent on 29 April 2026 and takes effect for the 2029/30 tax year.

• From 6 April 2029, only the first £2,000 a year of pension contributions made through salary sacrifice is exempt from National Insurance.
• Sacrificed pension contributions above £2,000 attract both employee and employer Class 1 National Insurance, in the same way as other employee workplace pension contributions.
• Income tax relief on pension contributions is unchanged, and so is the National Insurance relief on ordinary employer pension contributions that are not made through salary sacrifice.

Nothing changes for 2026/27, 2027/28 or 2028/29, so the arithmetic in this guide holds until April 2029. HMRC's policy paper sets out the detail.

Where it is worth most

Two zones stand out for employees in England, Wales and Northern Ireland. Between £50,270 and £100,000 you avoid 40% tax and 2% NI, so the £10,000 sacrifice on £70,000 in the table above costs 58p in the pound. Between £100,000 and £125,140 the personal allowance taper adds to the saving: £10,000 sacrificed on £110,000 costs only £3,800, or 38p in the pound - see the 60% tax trap and the personal allowance taper.

See your own numbers

The take-home pay calculator lets you switch between salary sacrifice, net pay and relief at source and watch take-home, tax, National Insurance and employer NI all move together. It runs on the same engine that produced every figure on this page. For a quick view at a single salary, the salary after tax pages each show the effect of a 5% salary sacrifice pension.

Common questions