How Does Salary Sacrifice Work for a Car? A Guide to Gross vs Net Pay in 2026/27

How Does Salary Sacrifice Work for a Car?

Salary sacrifice for a car is an arrangement where you give up part of your gross salary in exchange for a company car, typically a lease that includes insurance, servicing, and breakdown cover. The amount you sacrifice is deducted from your pay before Income Tax and employee National Insurance are calculated, which can reduce your tax bill. However, you then pay tax on the car’s Benefit-in-Kind (BIK) value, which is a percentage of the car’s list price.

The Key Rule: CO2 Emissions Determine the Tax Treatment

Under the Income Tax (Earnings and Pensions) Act 2003, the way your car is taxed depends on its CO2 emissions. For cars with emissions of 75 g/km or less (including all pure electric vehicles and many plug-in hybrids), the normal company car rules apply. This means you are taxed on the BIK value, not on the salary you gave up. For cars above 75 g/km, you are taxed on the higher of the salary foregone and the normal BIK charge, which usually eliminates any tax saving.

In 2026/27, the BIK rate for a zero-emission electric car is 4% of the list price (P11D value). For a car with a list price of £40,000, the taxable benefit is £1,600. A basic-rate (20%) taxpayer would pay £320 in Income Tax on that benefit, while a higher-rate (40%) taxpayer would pay £640.

Example: How the Saving Works

Let’s say you earn £40,000 and sacrifice £6,000 a year for an electric car with a list price of £40,000. Here’s the rough effect on your take-home pay:

• Without sacrifice: Gross £40,000, Income Tax £5,486, NI £2,194, take-home £32,320.
• With sacrifice: Gross £35,800, Income Tax £4,646, NI £1,858, plus BIK tax of £320 (basic rate) or £640 (higher rate). Take-home becomes £29,004 (basic rate) or £28,684 (higher rate).

The net saving compared to leasing the car from post-tax income is around £1,360 a year for a basic-rate employee and £1,880 for a higher-rate employee. Your employer also saves 15% Class 1 National Insurance on the sacrificed salary, which some may pass on as a fuel card or other benefit.

National Minimum Wage Guardrail

Salary sacrifice cannot reduce your cash earnings below the National Minimum Wage. From 1 April 2026, the National Living Wage for workers aged 21 and over is £12.71 per hour. If your contracted hours and hourly rate after the sacrifice would fall below this, the arrangement is not allowed. Employers typically build automatic checks into payroll to prevent this.

Impact on Other Deductions

• Pension contributions: If your pension is based on gross salary, sacrificing pay will reduce both your and your employer’s contributions. Some employers use ‘non-sacrifice’ salary for pension calculations – check your scheme.
• Student loan repayments: These are calculated on gross salary after sacrifice, so you may repay slightly less each month.
• Statutory pay: Maternity pay, sick pay, and other statutory payments are often based on average earnings, which could be lower if you sacrifice salary.
• Benefits and tax credits: Contribution-based benefits (e.g., Jobseeker’s Allowance) may be affected if your earnings drop.

Scottish Taxpayers

If you live in Scotland, Income Tax bands are different from the rest of the UK. There are six bands with marginal rates of 19%, 20%, 21%, 42%, 45%, and 48%. The BIK rules and National Insurance are UK-wide, but the income tax saving from sacrifice is calculated using Scottish rates. For a Scottish higher-rate taxpayer (42% above £43,663), the saving per pound sacrificed is slightly higher than for a rest-of-UK higher-rate taxpayer (40%). Use a take-home calculator with a Scottish toggle to see your exact figures.

Employer National Insurance

Your employer saves 15% Class 1 secondary National Insurance on the sacrificed salary. They then pay 15% Class 1A National Insurance on the BIK value of the car. For a £6,000 sacrifice on a £40,000 EV, the employer saves £900 in Class 1 NIC and pays £240 in Class 1A NIC, a net saving of £660. Some employers share this saving with employees.

Is It Worth It?

For electric cars and low-emission plug-in hybrids, salary sacrifice can significantly reduce your overall tax bill and make a new car more affordable. For higher-emission cars, the tax rules mean you gain little or nothing. Always compare the total cost of the scheme (including any administration fees) with leasing the same car privately. Check your personal tax situation, especially if you are a Scottish taxpayer or have student loans.

For more on how different deductions affect your pay, see our salary articles and salary data. You can also read about topics such as pension sacrifice and cycle-to-work schemes.

Summary

• Salary sacrifice swaps gross pay for a car; you save Income Tax and NI on the sacrificed amount.
• For cars ≤75 g/km CO2, you pay BIK tax at a percentage of list price (4% for EVs in 2026/27).
• For cars >75 g/km, you are taxed on the higher of sacrificed pay and BIK – no saving.
• Your cash pay cannot fall below the National Minimum Wage (£12.71/hr from April 2026).
• Side effects include reduced pension contributions, statutory pay, and student loan repayments.
• Scottish taxpayers face different Income Tax bands, affecting the net saving.

Always consult your employer’s scheme rules and use a reliable take-home calculator to model your specific situation.