Most people hear “salary sacrifice” and immediately assume there’s a catch somewhere. The name doesn’t help – who wants to sacrifice anything? But once you get past the slightly ominous branding, there’s a genuinely useful arrangement sitting underneath it, and it’s one that a lot of UK employees are missing out on simply because nobody’s explained it properly.

The basic idea is straightforward enough. Your employer agrees to reduce your gross salary by a set amount each month, and in exchange, you get a brand new car leased in your name through the company. As that reduction happens before tax and National Insurance are applied, you end up paying less of both. The car effectively costs you less than it would if you’d gone out and financed one yourself from your net pay.

How the Numbers Actually Stack Up

Say your salary is £40,000 a year. If your employer runs a salary sacrifice car scheme, you might sacrifice £500 a month towards a car. That £500 comes off your gross salary before HMRC takes its share, which means you’re not paying 20% (or 40%, depending on your bracket) income tax on it, plus you’re reducing your National Insurance contributions too. The actual dent in your monthly take-home is noticeably smaller than the headline £500 figure.

There’s a tax called Benefit in Kind (BIK) that you do need to account for. Because the car is technically a company benefit, HMRC taxes you on it based on the car’s list price and its CO2 emissions. This is where electric vehicles become genuinely compelling. EVs attract a BIK rate of just 2% currently, which means the taxable benefit is tiny. A petrol car with meaningful emissions sits at a much higher BIK percentage, which can eat into the savings considerably. So the scheme works best, by quite a margin, if you’re willing to go electric.

What’s Included and What Isn’t

One of the things people tend not to realise is that many salary sacrifice arrangements bundle in a reasonable chunk of what you’d normally have to sort yourself. Insurance, road tax, breakdown cover, and routine servicing are often included in the monthly figure, depending on the provider your employer uses. That’s not nothing. Anyone who’s recently renewed car insurance will know how fast those costs spiral.

What’s not included is fuel or charging; that part’s on you. If you’re a big mileage driver, you’ll want to check whether the scheme has mileage limits baked in, because excess mileage charges at the end of a lease can be a nasty surprise if you haven’t kept an eye on things.

The Bit That Catches People Out

There are a few things worth knowing before you sign anything. First, the car is a lease, not a purchase. At the end of the contract (usually two to four years) you hand it back. You don’t own it, there’s no option to buy it out at the end, and any damage beyond fair wear and tear will cost you. Second, reducing your salary can affect other things, like mortgage affordability calculations, certain benefit entitlements, and sometimes your pension contributions depending on how the scheme is structured. None of these are necessarily dealbreakers, but they’re the questions worth asking your HR team or a financial adviser before you commit.

It’s also employer-dependent. Not every company offers this, and the quality of the scheme varies quite a bit between providers. Some give you access to a decent range of cars; others restrict you to a limited list that’s, honestly, not very exciting.

Read: Learning The Artwork Of Residing A High-Priced Lifestyles On Any Budget

Is It Worth Bothering With?

For a higher-rate taxpayer who’s open to driving an EV, the maths are pretty compelling. You could save a meaningful chunk compared to leasing the same car personally. Even for basic-rate taxpayers, the savings are real, just smaller. Where people get unstuck is when they go for a high-emission petrol or diesel and then find the BIK tax liability chips away at what they thought they were saving.

The single biggest mistake people make is not running the actual numbers before deciding. Get the breakdown from your employer, look at the BIK rate for whichever car you’re considering, and work out what your real monthly cost would be after tax. It takes about twenty minutes and it’s the only way to know whether the arrangement genuinely works in your favour or just looks good on paper.