Pension Guide: Salary Sacrifice Explained — How It Works for Pensions, Cars and Childcare in 2025/26

Salary sacrifice (sometimes called salary exchange or smart pay) is an arrangement where you agree with your employer to give up part of your gross salary in exchange for a non-cash benefit. Because your contractual salary is reduced before tax and NI are calculated, both you and your employer pay less in National Insurance and income tax deductions.

The key distinction is that this is a contractual change — you are not simply diverting post-tax pay. Your employment contract is formally amended to reflect the lower salary, and the benefit is provided by your employer instead. This is why the arrangement must be agreed in advance and typically runs for a minimum period (often 12 months for non-pension benefits).

For example, if you earn £45,000 and sacrifice £5,000 into your pension, your taxable salary becomes £40,000. You save income tax and NI on that £5,000, and your employer also saves their NI contribution on the same amount. Many employers share their NI saving with employees by adding it to the pension contribution, effectively giving you free money.

Pension contributions through salary sacrifice are by far the most popular and financially rewarding application. Here is how the savings stack up for a £500 monthly pension contribution in 2025/26:

Without salary sacrifice (relief at source):

• You contribute £500 from net pay, your provider claims 20% basic rate relief = £625 in your pension
• If you are a higher-rate taxpayer, you claim an extra £125 via Self Assessment (file at gov.uk/self-assessment-tax-returns) = total £625 in pension
• You still pay NI on the £500

With salary sacrifice:

• Your salary reduces by £625 (gross amount)
• The full £625 goes into your pension as an employer contribution
• You save 8% employee NI on £625 = £50 per month
• Your employer saves 15% NI on £625 = £93.75 per month
• If your employer adds their NI saving, your pension gets £625 + £93.75 = £718.75

The annual pension allowance for 2025/26 is £60,000, so salary sacrifice contributions must stay within this limit (including employer contributions). Most employees are well within this ceiling, but higher earners with multiple pension sources should check.

One important consideration: salary sacrifice is not available through a SIPP or personal pension — it only works through employer workplace pension schemes where the employer makes the contribution directly.

Beyond pensions, salary sacrifice is commonly used for several other workplace benefits:

Electric car salary sacrifice has surged in popularity thanks to the ultra-low benefit-in-kind (BIK) tax rate. For 2025/26, pure electric vehicles have a BIK rate of just 2%, rising to 3% in 2026/27. This means an electric car worth £40,000 generates a BIK charge of only £800 per year — far less than the salary sacrificed, making it an extremely tax-efficient way to access a new car. Many schemes include insurance, maintenance, and breakdown cover in the package.

Cycle-to-work schemes let you sacrifice salary to cover the cost of a bicycle and accessories (up to any value, though some schemes cap at £1,000). You save income tax and NI on the amount sacrificed, typically reducing the effective cost by 32–47% depending on your tax bracket.

Childcare vouchers (closed to new entrants since October 2018 but still running for existing members) allowed salary sacrifice of up to £243 per month for basic-rate taxpayers. The Tax-Free Childcare scheme has largely replaced this, offering 20% top-ups on childcare costs up to £2,000 per child per year.

Technology schemes — some employers offer salary sacrifice for laptops, phones, or home office equipment, though these are less common and the BIK implications can reduce the tax advantage.

For benefits other than pensions, employer-provided childcare, cycle-to-work, and ultra-low emission vehicles, there are additional tax rules. HMRC's 'optional remuneration arrangement' (OpRA) rules mean the taxable benefit is the higher of the salary sacrificed or the normal BIK value. This limits the advantage for some benefits but does not affect pensions or the schemes listed above.

Salary sacrifice is not right for everyone. Before opting in, consider these practical implications:

It reduces your official salary, which affects:

• Mortgage applications: Lenders typically use your contractual salary for affordability checks. A £5,000 salary sacrifice could reduce your borrowing capacity.
• Statutory pay: Maternity, paternity, and sick pay are based on your reduced salary. If sacrifice takes you below the Lower Earnings Limit (£125 per week / £6,500 per year in 2025/26), you could lose entitlement to statutory payments and NI credits.
• State pension: NI contributions build your State Pension entitlement. Sacrifice below the Primary Threshold (£242 per week) could create gaps in your NI record.
• Life insurance and income protection: Employer-provided death-in-service benefits and income protection are often calculated as a multiple of salary — a lower salary means lower cover.

Salary sacrifice works best for:

• Higher and additional-rate taxpayers (40%+ tax savings plus 8% NI)
• Those with stable employment unlikely to need maximum mortgage borrowing soon
• Employees whose employers share the employer NI saving
• Anyone already above the NI Primary Threshold after sacrifice

It may not be suitable for:

• Those earning close to the National Living Wage (sacrifice cannot take you below NLW)
• Employees planning a mortgage application in the next 6–12 months
• Workers expecting to claim statutory maternity or paternity pay
• Anyone earning below £12,570 (no tax to save)

Setting up salary sacrifice is straightforward but requires employer participation — you cannot arrange it unilaterally:

1. Check availability: Ask your HR or payroll department which salary sacrifice schemes are offered
2. Review the terms: Understand the minimum commitment period, what happens if you leave, and whether your employer shares their NI saving
3. Calculate the impact: Use an online salary sacrifice calculator to model the effect on your take-home pay, pension pot, and statutory entitlements
4. Sign the variation: Your employment contract will be formally amended to reflect the new salary and benefit arrangement
5. **Check your payslip: After the first pay period, verify that the deduction is correct and your pension/benefit shows the expected amount

Common pitfalls include:

• Not claiming additional tax relief: If your scheme uses relief at source rather than salary sacrifice, higher-rate taxpayers must claim extra relief through Self Assessment. With salary sacrifice, the relief is automatic.
• Forgetting to review annually: Most pension salary sacrifice arrangements can be adjusted at set windows. If your circumstances change (new mortgage, baby expected), you may want to reduce your sacrifice temporarily.
• Exceeding the annual allowance: Total pension contributions (including employer match and sacrifice) must not exceed £60,000 or your annual earnings, whichever is lower. The tapered annual allowance can reduce this to as low as £10,000 for those earning above £260,000.

This article is for informational purposes only and does not constitute regulated financial advice. Consult a qualified financial adviser before making changes to your pension arrangements.

See our savings guide for alternatives to salary sacrifice.