⚡ The short answer
EV salary sacrifice works because a zero-emission company car carries a Benefit-in-Kind rate of just 4% in 2026/27, while the lease comes out of gross salary before income tax and National Insurance. The result is typically 20–50% cheaper than a personal lease — and the BIK rate rises to 5% in April 2027, 7% in 2028/29 and 9% in 2029/30, so a lease spanning those years needs costing across all of them.
Salary sacrifice is the most tax-efficient way to drive a new electric car in the UK, and also the most commonly misquoted. The headline percentages are real, but the amount you actually save depends on your marginal tax rate, the car's P11D value, how your employer shares its own National Insurance saving, and how long you are tied in.
Here is how the mechanism works in 2026/27, with the numbers that decide whether it beats a personal lease or PCP for you.
How the mechanism works
You agree to reduce your gross contractual salary by a fixed monthly amount. Your employer leases the car and makes it available to you as a company car, which is a taxable benefit. You pay Benefit-in-Kind (BIK) tax on that benefit through PAYE.
Because the sacrifice happens before income tax and employee National Insurance are calculated, the money used to pay for the car is never taxed as salary. The BIK charge replaces it — and for a pure electric car, the BIK charge is tiny relative to the salary given up.
One rule matters more than any other here. Cars with CO2 emissions of 75g/km or less are exempt from the optional remuneration arrangements (OpRA) rules, which were introduced in 2017 to stop salary sacrifice being used to convert taxed cash into lightly taxed benefits. For those low-emission cars, including every pure EV, the benefit is taxed on the normal cash equivalent alone rather than on the greater of the cash equivalent or the salary foregone. That exemption is the legal reason EV salary sacrifice still delivers the full saving.
The tax numbers for 2026/27
The BIK rate for a zero-emission car is 4% of P11D value this tax year, up from 3% in 2025/26. The published trajectory continues upward:
| Tax year | BIK rate, zero-emission car |
|---|---|
| 2025/26 | 3% |
| 2026/27 | 4% |
| 2027/28 | 5% |
| 2028/29 | 7% |
| 2029/30 | 9% |
Even at 9%, a zero-emission car sits far below petrol and diesel company cars, which run from 17% at 51g/km up to a 37% cap. A long-range plug-in hybrid with an electric range of 130 miles or more is treated the same as a pure EV at 4% this year — but that ends in April 2028, when the range bands are scrapped and every car in the 1–50g/km band pays a flat 18%. A PHEV lease signed now that runs past April 2028 should be costed on both figures.
On the payroll side, employee National Insurance is charged at 8% on earnings between £12,570 and £50,270 a year, and 2% above that. Employers pay 15% on earnings above the secondary threshold, plus Class 1A National Insurance at 15% on the BIK value itself. Many schemes pass some or all of the employer NIC saving back through lower monthly quotes — which is why two providers can offer the same car at noticeably different net costs.
A worked example: basic-rate taxpayer
Take a £40,000 salary and a car with a P11D value of £24,000, sacrificed at £229 a month — roughly the profile of a compact electric hatchback such as an MG4 EV or a BYD Dolphin Surf:
| Item | Monthly |
|---|---|
| Gross salary sacrificed | £229 |
| Income tax saved (20%) | −£46 |
| Employee NI saved (8%) | −£18 |
| BIK tax added (4% of £24,000 at 20%) | +£16 |
| Net monthly cost | £181 |
| Equivalent personal lease | £315 |
| Monthly saving | £134 (about 43%) |
For a higher-rate taxpayer the gap widens. Take an £80,000 salary and a £45,000 EV sacrificed at £500 a month. Income tax saved at 40% is £200, employee NI saved at 2% is £10, and BIK at 4% of £45,000 is £1,800 a year — £720 of tax at 40%, or £60 a month. Net cost: £350 a month, against a personal lease that would typically sit nearer £600. That is a saving of about £250 a month, or £3,000 a year, on the same car.
The pattern is consistent: the higher your marginal rate, the better salary sacrifice performs, because both the income tax relief and the BIK charge are calculated at your marginal rate while the NI saving dominates at basic rate.
The catches worth pricing in
National Minimum Wage. Your pay after sacrifice cannot fall below the minimum wage for your hours — £12.71 an hour for those aged 21 and over from April 2026. For lower earners this caps how much can be sacrificed, and it is the employer's legal duty to check.
Your contractual salary falls. Mortgage lenders, credit checks and some benefits use contractual pay, so a sacrifice can affect borrowing capacity and statutory pay. Ask your lender and payroll how they treat it before you sign.
You are usually committed. Leases typically run two to four years, and redundancy or resignation can trigger early-termination charges unless the scheme includes protection.
Future running costs are rising. Electric cars have paid Vehicle Excise Duty since April 2025, and the eVED consultation response published on 13 July 2026 confirmed a mileage charge of 3p per mile for battery-electric cars from April 2028, on top of VED rather than instead of it — around £255 a year for an average 8,500-mile driver. The Expensive Car Supplement threshold for EVs also rises to £50,000 from April 2028. Check whether the scheme quote includes tax and insurance or bills them separately.
The quote must be comparable. Salary sacrifice packages usually bundle insurance, servicing, maintenance, tyres, breakdown cover and road tax, which a personal lease rarely does. Compare net monthly cost against a like-for-like lease plus insurance, not against a bare lease figure — our electric car leasing guide sets out what each route includes, and the EV road tax guide covers what you pay from year two.
How to decide
Run the numbers on the specific car, not on a category. Use the BIK and salary sacrifice calculator to see the net cost at your tax rate, then compare that figure against a personal lease with insurance added. Check where the lease term falls across the BIK rate rises, ask what happens if you leave, and confirm what the employer NIC saving does to your quote.
If the numbers clear a personal lease by a wide margin — which they usually do for a pure EV — salary sacrifice is hard to beat. If you are near the minimum wage, planning to move jobs, or applying for a mortgage in the next two years, take advice before committing. To see which models make the maths work hardest, browse the electric car library and compare P11D values and real-world range side by side with the car comparison tool.
Sources
GOV.UK — Work out the appropriate percentage for company car benefits (480: Appendix 2), 2026 to 2027 rates (https://www.gov.uk/guidance/company-car-benefit-the-appropriate-percentage-480-appendix-2) · HMRC Employment Income Manual — EIM24705: appropriate percentage ready reckoner (https://www.gov.uk/hmrc-internal-manuals/employment-income-manual/eim24705) · GOV.UK — Optional remuneration arrangements (480: Appendix 12) (https://www.gov.uk/guidance/optional-remuneration-arrangements-480-appendix-12) · GOV.UK — Rates and allowances: National Insurance contributions, 2026 to 2027 (https://www.gov.uk/government/publications/rates-and-allowances-national-insurance-contributions/rates-and-allowances-national-insurance-contributions) · GOV.UK — The introduction of Electric Vehicle Excise Duty (eVED): consultation response, 13 July 2026 (https://www.gov.uk/government/consultations/consultation-on-the-introduction-of-electric-vehicle-excise-duty-eved/outcome/the-introduction-of-electric-vehicle-excise-duty-eved-consultation-response) · GOV.UK — Electric Vehicle Excise Duty (eVED) rates (https://www.gov.uk/government/publications/electric-vehicle-excise-duty-eved/electric-vehicle-excise-duty-eved) · Electric Car Scheme — Salary sacrifice cars: cost comparison examples (https://www.electriccarscheme.com/salary-sacrifice-cars) · Payetax — Electric Car Salary Sacrifice: The 2026/27 Guide (https://payetax.co.uk/blog/electric-car-salary-sacrifice-guide) · TaxKiln — EV Salary Sacrifice: OpRA test and NMW floor (https://taxkiln.co.uk/tax-reliefs/ev-salary-sacrifice)
