Salary Sacrifice UK: How It Works and What You Save

What is salary sacrifice?

Salary sacrifice is an arrangement where you agree to give up part of your cash salary in exchange for a benefit provided by your employer. The benefit is provided before income tax and National Insurance are calculated, so you pay less tax overall.

The most common use is pension contributions. Instead of your employer paying you £1,000 salary (which you then contribute £800 of to a pension after tax), they pay £1,000 directly into your pension and reduce your salary by £1,000. You skip the tax step.

How much do you save?

The saving depends on your income tax band:

Income band	Tax rate	NI rate	Total saving
Basic rate (£12,571–£50,270)	20%	12%	32%
Higher rate (£50,271–£125,140)	40%	2%	42%
Additional rate (£125,140+)	45%	2%	47%

Example: You earn £40,000 and sacrifice £2,000 for a pension. Your take-home pay falls by £1,360, but £2,000 goes into your pension. Net gain: £640 (32% of £2,000).

Employer saving: Your employer also saves 13.8% employer National Insurance on the sacrificed amount. Some employers pass this saving to you as an extra pension contribution.

What schemes can you use?

Not all employers offer salary sacrifice. Common schemes:

• Pension contributions: The most popular. Tax relief is automatic because the contribution is made before tax.
• Cycle to work: Salary sacrifice for a bike and equipment. You repay the cost over 12-18 months. Final ownership transfer may create a taxable benefit.
• Electric vehicles (EVs): Lease an EV through salary sacrifice. Benefit-in-kind (BIK) tax is low (2% for zero-emission vehicles from 2025-26).
• Childcare vouchers: Closed to new entrants since 2018. Existing users can continue.
• Workplace nursery: If your employer runs a nursery, you can salary sacrifice for childcare.
• Technology (phones, laptops): Less common. Must be for business use to avoid BIK tax.

Your employer chooses which schemes to offer. HMRC allows salary sacrifice for any benefit, but the employer bears administrative cost and risk.

How does it work in practice?

You and your employer sign a contract agreeing to reduce your contractual salary in exchange for the benefit. This is a permanent change to your employment terms. You cannot reverse it mid-year unless the contract allows specific trigger events (like financial hardship).

Each month, your payslip shows:

• Lower gross salary (the sacrificed amount is removed)
• Tax and NI calculated on the lower salary
• The benefit provided by the employer (e.g., pension contribution, bike lease payment)

If your employer passes on the employer NI saving, you'll see a larger pension contribution than the amount you sacrificed.

Salary sacrifice vs net pay arrangement

For pensions, there are two mechanisms for tax relief:

• Salary sacrifice (also called "net pay"): Employer pays into the pension before tax. You get tax relief automatically. Described above.
• Relief at source: You pay into the pension from your after-tax salary. The pension provider claims 20% tax relief from HMRC and adds it to your pot. Higher-rate taxpayers reclaim the extra 20% via self-assessment.

Salary sacrifice is better for higher earners because you get full relief immediately. Relief-at-source is simpler for basic-rate taxpayers but requires extra admin for higher earners.

What are the downsides?

Salary sacrifice lowers your official salary. This affects:

• Mortgage applications: Lenders assess affordability on your lower gross salary. May reduce borrowing capacity.
• Loan / credit applications: Same issue. Your stated income is lower.
• Statutory pay: Maternity, paternity, sick pay are based on your lower salary.
• State pension entitlement: You pay less National Insurance, so your state pension may be slightly lower (NI years still count if you're above the lower earnings limit).
• Life insurance / income protection: Some policies are linked to salary. Check your policy terms.

You need to balance the immediate tax saving against these knock-on effects. For many people, the tax saving outweighs the downsides, especially for pension contributions.

Can you reverse a salary sacrifice?

Once agreed, salary sacrifice is a contractual change. You cannot unilaterally cancel it. Most schemes allow reversal only on specific "lifestyle events" like:

• Getting married or divorced
• Having a child
• Moving house
• Financial hardship

Read your scheme's terms carefully. Some employers allow annual review windows. Others lock you in for the full contract term.

National Minimum Wage floor

HMRC does not allow salary sacrifice if it would drop your salary below National Minimum Wage (NMW) or National Living Wage (NLW). The only exception is pensions, which are excluded from NMW calculations.

For non-pension schemes, your post-sacrifice salary must remain above NLW (£12.21/hour for 21+ from April 2025).

Does HMRC ever challenge salary sacrifice?

HMRC accepts salary sacrifice schemes if they are genuine contractual changes to salary. A scheme can be challenged if:

• The benefit is cash or easily convertible to cash (not a real benefit-in-kind)
• The arrangement is not documented properly
• The employee can reverse it at will (looks like a bonus, not salary reduction)

Well-run schemes offered by major employers are rarely challenged. HMRC publishes detailed guidance in EIM42750-EIM42799.