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Salary sacrifice is one of the most tax-efficient arrangements available to UK employees — yet many people either haven’t heard of it or aren’t sure how it works. The core idea is simple: you agree with your employer to give up part of your salary in exchange for a non-cash benefit, and in doing so, you pay less income tax and National Insurance on the exchanged amount.
This guide explains exactly how salary sacrifice works, what you can use it for, how much you can save, and the situations where it might not be the right choice.
The Basic Mechanism
When you receive a salary, income tax and National Insurance (NI) are deducted before you see the money. Salary sacrifice changes this by redirecting some of your pre-tax pay directly into a benefit — before the taxman gets involved.
Example without salary sacrifice:
– Gross salary: £40,000
– Income tax (20% basic rate above personal allowance): ~£5,486
– Employee NI (8% on earnings between £12,570–£50,270): ~£2,196
– Take-home pay: approximately £32,318
Example with salary sacrifice of £2,000 into pension:
– Adjusted gross salary: £38,000
– Income tax: ~£5,086
– Employee NI: ~£2,036
– Take-home pay: approximately £30,914
The employee’s take-home pay drops by about £1,400, but £2,000 goes into their pension. The “cost” of £2,000 of pension saving is only £1,400 out of pocket — a 30% effective contribution boost.
Employers also save NI on the sacrificed amount (13.8%), which is why many employers encourage salary sacrifice and sometimes share their NI saving with employees through enhanced pension contributions.
What Can You Sacrifice Salary For?
HMRC permits salary sacrifice for a defined list of benefits:
| Benefit | Notes |
|---|---|
| Pension contributions | Most common; significant tax and NI savings |
| Childcare vouchers | Closed to new entrants since 2018; existing members can continue |
| Tax-free childcare | Separate government scheme (not salary sacrifice, but worth knowing) |
| Cycle to Work scheme | Up to £1,000 tax-free (higher limits for e-bikes on some schemes) |
| Electric vehicle (EV) salary sacrifice | Rapidly growing; very low Benefit in Kind tax on EVs makes this highly efficient |
| Annual leave purchase | Some employers let you buy extra holiday via salary sacrifice |
| Health screening / medical insurance | Where offered by employer |
| Technology (phones, laptops) | Some employer schemes |
Not all employers offer all of these — what’s available depends entirely on your employer’s scheme.
Pension Salary Sacrifice: The Biggest Win
The most widely available and financially significant salary sacrifice option is the pension. If your employer offers it, contributing via salary sacrifice rather than standard employee contributions saves you both income tax and National Insurance.
With standard pension contributions, you pay NI on your gross salary first, then your contribution goes in (with basic rate tax relief added by the pension provider). With salary sacrifice, the contribution comes out before NI is calculated — meaning you save 8% NI (or 2% above the upper earnings limit) on top of the tax relief.
Over a career, this difference is substantial. A basic rate taxpayer sacrificing £2,400 per year into their pension saves:
– £480 in income tax (20%)
– £192 in NI (8%)
– Total saving: £672 per year compared to keeping the money as salary and contributing from take-home pay
Higher rate taxpayers save more.
The Cycle to Work Scheme
Cycle to Work lets you pay for a bicycle and cycling equipment from your pre-tax salary. The scheme typically works as a hire agreement rather than an outright purchase — your employer buys the bike and you “hire” it over 12 months through salary sacrifice, after which you can purchase it at a nominal fair market value.
How much you save: A basic rate taxpayer buying a £600 bike effectively pays around £408 after tax and NI savings (32% discount). A higher rate taxpayer pays around £348 (42% discount).
Practical limits: The standard limit is £1,000 for a standard bike, though some employer schemes go higher for e-bikes. The bike must primarily be used for commuting to qualify.
Electric Vehicle Salary Sacrifice
EV salary sacrifice has become increasingly attractive because fully electric vehicles are taxed at a very low Benefit in Kind (BIK) rate — just 2% of the car’s list price for 2026/27. For a £35,000 EV, the taxable benefit is only £700 per year, meaning the tax cost is minimal.
Combined with salary sacrifice (pre-tax payment) and savings on fuel and maintenance compared to a petrol car, this can make a new EV significantly cheaper than buying or leasing independently. Higher earners benefit most due to higher marginal tax rates.
Important: salary sacrifice for cars (unlike pensions) does reduce your pensionable pay, which may affect employer pension contributions calculated as a percentage of salary.
The Trade-Offs to Consider
Salary sacrifice isn’t cost-free. Reducing your gross salary has some implications:
Mortgage applications: Lenders assess affordability based on your salary. A significantly lower salary on paper can reduce how much you can borrow. Check with your lender or broker before setting up a large salary sacrifice arrangement if you’re planning to apply for a mortgage.
Statutory pay: Statutory Maternity Pay (SMP), Statutory Paternity Pay (SPP), and Statutory Sick Pay (SSP) are calculated on your pensionable earnings. If salary sacrifice reduces these, your statutory payments may be lower.
Life assurance (death in service): Often calculated as a multiple of your salary. If your employer uses the sacrificed (lower) salary figure, your death in service benefit reduces.
Pension lifetime allowance: Less of a concern following the 2023 abolition of the lifetime allowance charge, but large pension balances can still have implications — worth checking if you’re a very high earner with a large existing pension.
How to Set Up Salary Sacrifice
You can’t arrange salary sacrifice yourself — it must be set up through your employer’s payroll system. The process:
- Check what schemes your employer offers (HR or your employee benefits portal)
- Complete an opt-in form or use your employer’s online portal
- Your payroll is adjusted, typically from the next pay period
- Confirm your new take-home pay and the benefits you’re receiving
Once set up, it runs automatically. Review it annually — if your circumstances change (new mortgage, salary increase, life change), your sacrifice amount may need adjusting.
According to HMRC’s guidance on employment income, salary sacrifice arrangements must be genuine changes to your contract of employment, not just a paper exercise.
The Money and Pensions Service via MoneyHelper offers a plain-English overview of the rules and common pitfalls.
Conclusion
Salary sacrifice is one of the most tax-efficient tools available to UK employees and is underused simply because many people don’t know about it.
- Pension salary sacrifice is the most impactful — you save both income tax and National Insurance, not just tax relief like a standard contribution
- Cycle to Work is a straightforward win for commuters — typically 28–42% off the cost of a bike
- EV salary sacrifice is increasingly attractive for those who need a car and can use an electric vehicle
- Check the trade-offs if you’re applying for a mortgage or your statutory pay matters — a lower reported salary has real consequences in those contexts
- Set it up through your employer — it’s an HR/payroll change, not something you arrange independently
Next read: Want to pay less tax overall? Read our guide on claiming tax relief on pension contributions UK: /claiming-tax-relief-on-pension-contributions-uk