Company Car Tax in 2026/27: What the 4% Electric Benefit-in-Kind Rate Actually Saves You Over Petrol

A finance manager in Leeds spent twenty minutes last week talking a sales rep through his company car options, because the rep had assumed a diesel estate would cost roughly what his last one did on the payslip. It doesn't, not any more. He drove away in an MG4 instead — not because he'd fallen for it on the test drive, but because the tax numbers made the decision for him before the conversation was even finished.

That gap between what you'd expect to pay and what HMRC actually charges for a company car has never been wider than it is for the 2026/27 tax year, and it's already starting to narrow — slowly, and only for battery electric cars. If you're choosing a company vehicle this autumn, or signing off a fleet renewal before the new tax year lands in April, the numbers below are worth fifteen minutes of anyone's time. They're bigger than most drivers assume, in both directions.

What Benefit-in-Kind Actually Charges You For

Company car tax — properly called Benefit-in-Kind, or BiK — isn't a tax on the car itself. It's a tax on the fact that your employer is letting you use, personally, a vehicle that the business bought or leased. HMRC works out a "P11D value" for the car (broadly the list price including VAT, delivery and any factory-fitted extras, but not the registration fee or any discount you negotiated), multiplies it by a percentage set according to CO2 emissions and, for plug-in hybrids, electric-only range, and calls the result your taxable benefit. You then pay income tax on that figure at your normal rate — 20%, 40% or 45% — exactly as if HMRC had added it straight to your salary. Your employer pays Class 1A National Insurance on the same figure, which is one reason fleet managers care about these bands just as much as drivers do. None of this is optional or negotiable; the percentage is set centrally, published years in advance, and applies the same way whether you're driving a Nissan Qashqai or a Bentley.

The percentage is the entire game. Two cars with an identical £30,000 price tag can produce wildly different tax bills purely because one runs on a battery and the other doesn't.

The 2026/27 Numbers: 4% Against Up to 37%

For the tax year that started this April, a fully electric company car — anything with 0g/km CO2 — sits in HMRC's 4% band. A petrol, diesel or self-charging hybrid car climbs the scale in line with its official WLTP CO2 figure, starting at 17% for cars emitting 51-54g/km and reaching the maximum 37% for anything at 155g/km or above. Plug-in hybrids sit somewhere in between, banded by both CO2 and how far they'll travel on electric power alone: 4% if they'll do 130 miles or more on a charge, stepping up through 7%, 10% and 14% to a ceiling of 16% for the ones that barely manage 30 miles before the petrol engine takes over.

Put a real petrol car next to a real EV and the gap stops being theoretical. A Ford Puma Titanium 1.0 EcoBoost Hybrid — one of the best-selling small SUVs on British roads, priced from £27,145 on the road — emits 122g/km CO2, which lands it in the 30% band. An MG4 EV, a similarly mainstream hatchback priced from £29,995, sits in the 4% band because it produces no tailpipe emissions at all.

What That Looks Like in Real Money

Run those two cars through the calculation and the difference stops being an abstraction. The Puma's taxable benefit is £27,145 × 30%, or £8,144. A driver on the 40% tax rate pays 40% of that as company car tax: £3,257 a year, £271 a month, taken straight off the payslip. A basic-rate (20%) taxpayer still hands over £1,629 a year for the privilege of driving it.

The MG4's taxable benefit is £29,995 × 4%, or £1,200. That same 40% taxpayer pays £480 a year — £40 a month — despite the car costing nearly £3,000 more to buy in the first place. A 20% taxpayer pays £240. Don't let the sticker price fool you into thinking the EV is the expensive option here: over three years of typical ownership, the Puma driver hands HMRC roughly £2,777 more than the MG4 driver does, and that's before anyone's even compared the cost of diesel against a home charging tariff.

The Climb From 4% to 9% Is Already Locked In

Nine per cent by 2029/30 still beats thirty-seven.

HMRC has confirmed the EV rate schedule out to the end of the decade, and it's worth having the whole ladder in front of you before you order anything:

• 2026/27 — 4% (this tax year, and the one worth planning your order around right now)
• 2027/28 — 5%
• 2028/29 — 7%
• 2029/30 — 9%, with most fleet advisers expecting the climb to continue after that, though nothing beyond 2029/30 has actually been confirmed yet

That's a deliberate, gradual squeeze. The Treasury needs the revenue as electric cars stop being a rounding error in the new-car market and start making up a genuine share of it, and BiK bands have always been the lever governments pull to steer company car choice in whichever direction suits the public finances that year. One detail catches drivers out here: the rate isn't fixed to the year your car was first registered, it's a fixed national schedule that applies to every EV on the road in a given tax year, so a car ordered in 2026 still moves from 4% to 5% to 7% as the calendar rolls on, exactly like one ordered next spring would. But look at where the schedule still leaves the comparison even at its top: a 9% EV sits miles below the 17% starting point for the cleanest petrol hybrids, and nowhere near the 37% ceiling that catches most family SUVs and estates. Order an EV on a typical three or four-year company car cycle now, and you'll ride out most of that climb before it bites you; the driver who orders fresh in 2029 will feel considerably more of it than the one who signs the paperwork this autumn. Fleet leasing brokers have already started building that arithmetic into their advice sheets, because a driver who understood none of this two years ago is now asking pointed questions about depreciation curves instead.

Vehicle Tax Has Caught Up With Electric Cars Too

Company car tax is only half of what an EV driver now pays HMRC. Since 1 April 2025, electric cars have paid standard Vehicle Excise Duty for the first time — before that they were exempt entirely, which used to be one of the strongest financial arguments for going electric in the first place. A new EV registered from that date pays £10 in its first year, then moves onto the standard rate, which rose from £195 to £200 from 1 April 2026. Hybrids lost their old £10 annual discount at the same time, so a Puma-sized hybrid and an MG4 now pay exactly the same £200 a year in road tax; the EV's advantage on this particular line item has effectively gone.

Where EVs still come out ahead is the "expensive car supplement" — the extra charge that kicks in on any car above a set list price, paid on top of the standard rate for five years starting in the second year of ownership. For petrol and diesel cars that threshold has sat at £40,000 for years, which catches an uncomfortable number of ordinary family SUVs the moment you tick a few option boxes. From April 2026, electric cars got their own, more generous threshold of £50,000, and the supplement itself now runs to £440 a year — £640 a year combined with the standard rate, for five years straight. Neither the Puma nor the MG4 from the example above comes close to either threshold, but if you're speccing a top-trim electric SUV with the bigger battery and a few option packs, £50,000 arrives faster than most buyers expect.

The Pay-Per-Mile Charge Coming in 2028

The government has already signalled the next move. From 2028, electric and plug-in hybrid cars are due to start paying a distance-based charge on top of everything above, described in official material as a road-pricing scheme calculated per mile driven rather than as one flat annual fee. The detail — the exact rate per mile, how it gets collected, whether it replaces or sits alongside the standard VED rate — hasn't been settled yet, and anyone quoting you a precise pence-per-mile figure this far out is guessing. What is settled is the direction of travel: as fuel duty receipts shrink with every diesel car that leaves the road, the Treasury has decided electric drivers need to start funding road maintenance in a way that doesn't run through a fuel pump.

Plug-In Hybrids Are About to Lose Their Range-Based Edge

If you've been eyeing a plug-in hybrid specifically because a long electric-only range drops it into a low BiK band, enjoy the arrangement while it lasts. From April 2028, HMRC is scrapping the range-based calculation entirely for cars emitting 1-50g/km CO2 and replacing it with a single flat rate of 18%, regardless of whether the battery alone will cover 20 miles or 70. A plug-in SUV bought today for its 7% or 10% band will, on exactly the same emissions figure, cost its driver roughly double once that change lands — not because the car itself changed in any way, but because the rulebook underneath it did.

What to Actually Do About It This Autumn

If you're ordering a company car in the next few months and the shortlist includes anything emitting more than 150g/km, don't sign off on it without running the EV alternative through the same calculation first. The gap at that end of the CO2 scale is now large enough to change monthly take-home pay by hundreds of pounds, not a rounding error you can wave away because the diesel "feels" like better value at the pump. And if a plug-in hybrid's whole appeal rests on a long electric range keeping the BiK band low, either order before April 2028 or accept that you're really buying a heavier, thirstier petrol car that happens to carry a battery — with the tax bill to match from that point on.

Company and fleet buyers already register more than half of Britain's new cars between them: SMMT logged 1,194,545 fleet registrations and 46,388 business registrations in a market that broke through two million for the year. This isn't a niche calculation that applies to a handful of reps in company Mondeos. It's the single biggest financial lever most working drivers in the UK have any real control over, and most of them are still choosing their next car on horsepower and styling before they've opened a spreadsheet.