Salary sacrifice is the closest thing UK tax law has to a cheat code for running a new electric car. The pitch sounds too good — "get a £500-a-month car for £300" — and most people's instinct is to look for the catch. There are catches, and we'll get to them, but the headline genuinely is real, and it comes from two perfectly legal tax quirks stacked on top of each other.
Quirk one: you pay from gross salary
In a salary sacrifice scheme, your employer leases the car and you give up part of your salary to cover it — before income tax and National Insurance are calculated. If you're a higher-rate taxpayer giving up £500 of gross salary, your take-home pay only falls by about £290, because that £500 would have been taxed at 40% plus 2% NI anyway. A basic-rate taxpayer keeps less of the benefit but still pays roughly £360 for the same £500 lease. The taxman is, in effect, subsidising your car to the tune of your marginal tax rate.
Quirk two: BiK on EVs is tiny
Normally HMRC claws back this kind of arrangement through Benefit-in-Kind (BiK) tax — company car tax. For petrol and diesel cars, BiK runs 25–37% of the car's list price per year, which kills the deal. For EVs it's 4% in 2026/27 (rising one point a year to 5% in 2027/28, then 7% and 9% under current plans). On a £40,000 EV, a 40% taxpayer pays 40% × 4% × £40,000 = £640 a year — about £53 a month. That's the "catch", and it's small compared with the income tax saved.
A worked example
| 40% taxpayer | 20% taxpayer | |
|---|---|---|
| Gross monthly sacrifice | £500 | £500 |
| Tax + NI saved | ~£210 | ~£140 |
| BiK tax (£40k car, 4%) | ~£53 | ~£27 |
| Real monthly cost | ~£343 | ~£387 |
Bear in mind the £500 scheme price usually includes insurance, servicing, tyres and breakdown cover — so compare it against a personal lease plus all of those, not the bare lease price. Done fairly, salary sacrifice beats personal leasing for almost every taxpayer who has access to a scheme.
The actual catches
- Leaving your job. The car goes back or transfers, and early-termination terms vary from benign to punitive. This is the single most important clause to read. Good schemes include life-event protections (redundancy, parental leave); bad ones don't.
- Minimum wage floor. Your post-sacrifice salary can't fall below minimum wage, which rules out some lower earners.
- Pension and borrowing knock-ons. A lower gross salary can reduce employer pension contributions and the salary a mortgage lender sees. Usually minor, occasionally decisive.
- BiK rates rise. 4% now, but 9% by 2029/30 under announced plans. Still cheap next to petrol BiK, but factor the rise into a 3–4 year agreement.
Putting it in context
Salary sacrifice changes how you pay for the car, not what it costs to run. You'll still want cheap overnight charging (see the tariff guide) and honest expectations about winter efficiency. Put your real scheme quote into the calculator as the EV's monthly payment and you'll see the full picture against your current car.
Compare a salary sacrifice quote with your current car