Benefit-in-Kind Explained: What Every Employee With a Company Car Needs to Know

Most guides to Benefit-in-Kind tax are written for individuals. This one is written for the kind of business owner who’s actually weighing it up, deciding what to put their finance director in, or what to offer the sales team as a perk. If that’s you, the BIK line on a quote is probably the bit that decides which car gets ordered.

The trouble is, BIK is rarely explained in plain English. It sits quietly in the background, but it has a real impact on what your driver takes home each month and what a company car genuinely costs to provide. This guide walks you through how it’s worked out, why electric vehicles are still such a strong choice, and what to keep an eye on over the next few years.

What is Benefit-in-Kind?

When you give an employee something of value on top of their salary, HMRC treats it as a benefit. That benefit has a value, and the employee pays income tax on that value. A company car is one of the most common examples.

In short, if a driver can use the car for personal journeys (anything that isn’t strictly business use), they’re receiving a taxable benefit. BIK is how HMRC puts a number on that benefit so it can be taxed alongside the rest of their income, through PAYE. The business has its own thing to think about too, Class 1A National Insurance on the same benefit, but the headline BIK tax sits with the driver.

How is company car BIK calculated?

There are three ingredients:

1. The P11D value of the car. Essentially the list price including VAT, delivery and any factory-fitted options, but excluding road tax and first registration fee.
2. The BIK percentage. Set by HMRC, based mainly on the car’s CO2 emissions, and for plug-in hybrids, its electric-only range.
3. The driver’s income tax rate. Usually 20%, 40% or 45%.

The formula is straightforward:

P11D value × BIK percentage × tax rate = annual BIK tax bill

Divide by 12 for the monthly cost to the driver.

A worked example

Two cars, both with a P11D of around £45,000. One is a petrol executive saloon emitting around 160g/km of CO2. The other is a comparable electric saloon. The driver is a 40% taxpayer.

Figures are illustrative to show the scale of the gap.

Same car value, same driver, same salary. The petrol saloon costs the driver well over £500 a month in tax. The EV costs them less than a pub lunch. That’s the size of the lever you’re working with when you choose the car.

Why are electric cars still so favourable?

For several years, government policy has deliberately tilted company car tax in favour of zero-emission vehicles. The idea is to use the tax system to nudge company drivers, who tend to refresh their cars every three or four years on a lease, into cleaner choices.

The gap remains striking. EVs sit in a very low band. Petrol and diesel cars sit much higher, often more than ten times the EV rate for an equivalent vehicle. Plug-in hybrids fall somewhere in between, with the rate depending heavily on the official electric-only range. The longer the range, the lower the percentage.

For a higher-rate taxpayer choosing a £50,000 car, that difference alone often settles the question. It’s why so many directors and senior staff have moved into electric company cars, and why your accountant probably keeps gently steering you that way. If you’d like to see how the numbers stack up over a full lease, our what will I save page works through it in more detail, and the broader picture of how EVs work in practice is on our introduction to electric vehicles.

What about plug-in hybrids?

Plug-in hybrids used to be a tax-efficient middle ground. The picture is more nuanced now. A long-range PHEV sits in a relatively friendly band. A shorter-range one is taxed much closer to a conventional car.

For some drivers, particularly those who genuinely can’t charge at home or work, a PHEV is still a sensible option. For most company drivers who can plug in overnight, a pure EV is now usually the simpler and more tax-efficient choice.

What’s changing in the years ahead?

EV BIK rates are scheduled to rise gradually. They’ll stay well below petrol and diesel rates for the foreseeable future, but the gap will narrow over time.

There’s a useful planning point in this. The rate that applies in any given tax year is locked in for that year, so ordering before an April step-up can lock in the lower band for a meaningful chunk of a four-year contract. We see this regularly: a driver who orders in February pays noticeably less BIK over the life of the lease than the same driver in the same car ordering in May. Worth knowing when you’re planning a fleet refresh.

Future-year rates are announced in advance and occasionally adjusted in subsequent Budgets, so it’s always worth confirming the published figures before committing.

Car as a perk, or cash allowance?

A question we hear often from owner-managed businesses with five or ten staff: do we offer a company car, or just bump up salaries and let people sort their own?

There’s no universal answer, but the BIK position usually tips it:

• A company car means the driver pays BIK tax, but the business carries the lease and running costs and recovers VAT where eligible. With an EV, the BIK bill is currently so low that the driver effectively gets a substantial perk for a small monthly tax cost.
• A cash allowance is taxed as straight income on top of salary. The employee then arranges their own personal contract hire privately. They avoid BIK, but you lose the corporate purchasing power, the VAT efficiency and any control over what they actually drive.

For an EV right now, offering it as a company car almost always works out better for the driver and is rarely worse for the business. For a higher-emission petrol or diesel, the maths gets closer and a cash allowance sometimes wins. This is the kind of question we work through with clients case by case, because the right answer depends on your team, your tax position and how the business is structured. The mechanics of the company side are explained on our business car leasing page.

Practical checklist before you order

A short list of things drivers and owners regularly miss:

• Get the P11D value from the dealer or your broker, not just the headline list price.
• Remember that optional extras count toward the P11D. A £2,000 metallic paint and tech pack adds tax for the life of the contract.
• Check the CO2 figure and (for PHEVs) the electric range. These set the band.
• Ask for the BIK rate for the current tax year and the next two or three years, so there are no surprises mid-contract.
• Compare like-for-like with an EV equivalent, even if you weren’t planning to go electric. The BIK difference often changes the maths.
• Mind the April step-ups. Ordering before a rate change can lock in the lower band for the whole lease.
• Talk to your accountant before signing. BIK interacts with salary sacrifice, pension contributions and dividend planning in ways that are personal to your situation.

There’s more on how this fits into the wider picture in our next post on Personal Contract Hire versus Business Contract Hire.

How we approach this with clients

BIK looks complicated from the outside, but once you know the three ingredients, it stops being mysterious. The real value is in using it well: choosing the right car for the driver’s tax position, and timing the order so you make the most of today’s EV rates before they step up.

That’s the kind of thing we spend time on with the businesses we work with. We deliberately keep our client list small, so when you ring us about replacing the sales director’s car, we already know your fleet, your drivers and how you like to do things. No trawling comparison sites at midnight. No surprises on the BIK line. Just a straightforward conversation with someone who knows the ropes.

If you’d like to talk through what your next company car should actually cost, BIK included, we’re easy to reach.

This article is a general guide, not tax advice. BIK rates and rules change, often at each Budget. Always confirm specific figures with your accountant or HMRC before making a decision.