Tesla Model 3 Company Car Tax 2025/26: The Numbers Every Limited Company Owner Needs to See Before This Window Closes

I’ve been a petrolhead my entire life. V8s. The smell of fuel on a cold morning. The sound of a naturally aspirated engine at full stretch. I’ve bought cars that made absolutely zero financial sense and I’d do every one of them again.

So when I tell you I’ve just put a Tesla Model 3 through my limited company, you need to understand what it took to get me there.

It wasn’t a change of heart. It wasn’t a values shift. It wasn’t because I suddenly care more about CO2 than tyre smoke.

It was the numbers. And the numbers are, frankly, stupid.

The Government Has Done This Before, and Most People Missed It

Cast your mind back to the early 2000s. The government wanted people driving diesel cars. They decided diesel was cleaner than petrol- spoiler: the science eventually disagreed, and to push drivers in that direction they attached significantly lower Benefit in Kind rates to diesel company cars.

People who spotted that early kept thousands. They drove better cars for less tax, let their company fund the decision, and moved on with their lives. The people who were too busy moaning about being pushed toward diesel kept paying full whack on petrol and watched those people drive past.

History is repeating itself. The government has decided electric is the direction of travel, the UK’s Zero Emission Vehicle mandate requires manufacturers to move to 80% zero-emission sales by 2030??  and they have built the same kind of incentive into the tax system to push company car drivers toward EVs.

The incentive is real. It is time-limited. And most people are either ignoring it or arguing about it on the internet instead of using it.

What the BIK Rate for Electric Cars Actually Means in 2025/26

Benefit in Kind tax is what you pay when you use a company-provided car for personal use. HMRC treats that personal use as a taxable benefit. The amount you pay is calculated using three variables: the car’s P11D value (its official list price including VAT and options, excluding registration and road tax), the BIK percentage assigned to that vehicle based on its CO2 emissions, and your personal income tax rate.

The formula is straightforward:

For fully electric vehicles in the 2025/26 tax year, the BIK rate sits at 3%. That figure was 2% the year before. It rises to 4% in 2026/27, and increases by 1% per year until 2027/28, then 2% per year until it reaches a cap of 9% in 2029/30.

For petrol and diesel cars, the same BIK rate sits between 25% and 37% depending on CO2 emissions, with an additional 4% diesel surcharge applied to vehicles that don’t meet RDE2 emissions standards.

That gap – 3% versus 25–37% – is where the money is.

The Exact Numbers on a £49,000 Tesla Model 3

My car came in just under £49,000. Here is what that looks like in actual tax:

Twenty-four pounds fifty a month if you’re a basic rate taxpayer. Forty-nine pounds a month if you’re a higher rate taxpayer. On a nearly fifty thousand pound car.

Now look at what a similarly priced BMW 3 Series costs in the same tax year. A petrol 3 Series sits around a 30–32% BIK band depending on the specific variant and emissions.

Same class of car. Similar money. The 40% taxpayer in the BMW is paying roughly £447 more per month in company car tax alone. That’s over £5,300 a year. Every year.

That is not a rounding error. That is a structural tax advantage the government has written into the rules, and it is available to any limited company owner right now.

The Fuel Cost That Changed My Mind Entirely

Here is the number that finished the argument for me, coming from someone who still believes nothing in automotive history has sounded as good as a high-revving naturally aspirated V8.

400 miles. One overnight charge at home. £3.94.

That is not a headline figure or a manufacturer’s claim run under perfect lab conditions. That is what it cost me, charged overnight on a home tariff.

For context: a BMW 3 Series doing 400 miles at a real-world diesel consumption of around 45mpg uses roughly 40 litres of fuel. At the current pump price of £1.93 per litre, that is £77.20.

On fuel cost alone, the saving is significant. For any business owner doing meaningful mileage, that difference compounds quickly across a year.

The Tax Advantage the Company Gets

The BIK discussion above covers what you pay personally as the driver. But there is a separate and significant tax benefit for the business itself.

If you buy a fully electric car outright or on hire purchase through your limited company, you can claim 100% First Year Allowance against your corporation tax bill in year one. The entire purchase cost is deducted from taxable company profits in the year you buy it.

On a £49,000 car with a company paying 25% corporation tax, that is a £12,250 tax saving in year one. The car does not need to depreciate through writing-down allowances over multiple years the way a petrol or diesel vehicle does. It comes off your profit immediately.

This applies where the company owns the vehicle outright or through hire purchase. It does not apply to lease agreements. If you are considering leasing versus buying, that distinction matters significantly to the numbers and is worth a conversation with your accountant.

What About the Negatives? Let’s Be Honest About Them

Any piece of content that tells you only the upsides of a financial decision is trying to sell you something. I am not selling you a car. So here is what is coming.

Pence per mile charge from April 2028. The government is introducing a mileage-based charge on electric vehicles of approximately 3p per mile from 2028. For a driver covering average annual mileage of 8,500 miles, that is roughly £255 per year. It is worth knowing. It does not change the overall economic case for the current tax year.

The Expensive Car Supplement. Vehicles over a certain list price threshold attract an additional annual VED charge. From April 2026 the threshold for battery electric cars increases from £40,000 to £50,000, so a car coming in just under £49,000 sits below that line, but it is something to be aware of if you are speccing a higher-value vehicle.

BIK rates are rising. The 3% rate in 2025/26 moves to 4% next year, then 5%, then 7%, then 9% by 2029/30. At 9% the advantage is smaller than it is today, though it remains substantially below petrol and diesel rates which are simultaneously heading toward 38–39%. The best returns on this decision are in the current and next couple of tax years.

Public charging costs more. Overnight home charging at £3.94 for 400 miles is the best-case figure. Public rapid charging on a motorway network costs significantly more, often comparable to or exceeding petrol on a per-mile basis. The home charging economics assume you can charge at home most of the time.

None of these change the fundamental arithmetic. They are part of it.

The BIK Rate Roadmap: How Long Does the Window Stay Open?

Even at 9% in 2029/30, a 40% taxpayer in a £49,000 electric car pays £1,764 a year in BIK tax. The equivalent petrol car at a 35% BIK rate costs £6,860 a year. The gap narrows, but it never closes.

The best years are now. The decision gets slightly more expensive every April.

Why Most Business Owners Are Leaving This on the Table

The people who took advantage of diesel incentives in the early 2000s were not car obsessives who had studied tax policy. They were business owners who had someone in their corner who understood where the money was and told them about it clearly.

The EV company car incentive is not complicated. It is not a scheme. It does not require a sophisticated tax structure. It requires a limited company, a decision to put the car through the business, and a conversation with an accountant about whether to buy or lease.

What stops most people is inertia, habit, or the noise around electric cars, the arguments about Elon, the range anxiety conversation, the vague sense that being pushed toward something by the government is a reason not to do it. None of those things change the BIK rate. None of them change what the car costs to run.

“While some people are on forums arguing about range anxiety and whether Elon said something they don’t like, others are putting a £49,000 car through their business for £49 a month in company car tax and charging it for under a fiver. That’s not opinion. That’s arithmetic.”

I help limited company owners and SME directors identify where money is leaving their business and stop it. Tax efficiency on company cars is one of the clearest, most immediately actionable examples in the current climate. The Profit Clarity Framework I use with clients regularly surfaces this kind of structural opportunity,  not because it is obscure, but because most owners are too close to the day-to-day to look up and notice it.

What to Do Next

If you run a limited company and you are currently driving a petrol or diesel vehicle through the business, or funding a car entirely from your own post-tax income, there are three conversations worth having this week.

First, speak to your accountant about whether buying outright or via hire purchase makes sense for your corporation tax position this year, specifically in the context of the 100% First Year Allowance before the rates shift further.

Second, get the actual BIK numbers for the specific car you are considering. The formula is simple: P11D value × 3% × your tax rate. Run it. Compare it against what you are paying now.

Third, factor in the fuel saving honestly. If you can charge primarily at home, the operating cost difference over three years of ownership is substantial. If you rely mainly on public charging, the numbers are closer, still favourable on BIK, but less dramatic on fuel.

The incentive is real. The maths is clear. The window is open now and it is narrowing every April.

I am a petrolhead who ran the numbers. The numbers won.

Frequently Asked Questions

What is the BIK rate for a Tesla Model 3 in 2025/26?

The BIK rate for a fully electric vehicle, including the Tesla Model 3, is 3% in the 2025/26 tax year. This is the lowest company car tax band and applies because the car produces zero CO2 emissions.

How much company car tax do I pay on a £49,000 Tesla Model 3?

The taxable benefit is £49,000 × 3% = £1,470 per year. A 20% taxpayer pays £294 per year (£24.50 per month). A 40% taxpayer pays £588 per year (£49 per month).

Can I claim 100% First Year Allowance on a Tesla Model 3?

Yes, if you purchase outright or on hire purchase through a limited company, you can claim 100% First Year Allowance in the year of purchase. This means the full cost of the vehicle is deducted from taxable company profits in year one. This does not apply to lease agreements.

How long will the low BIK rates for electric cars last?

The 3% rate applies in 2025/26. It rises to 4% in 2026/27, 5% in 2027/28, 7% in 2028/29, and reaches a cap of 9% in 2029/30. These rates have been confirmed by HMRC and remain unchanged following the Spring Statement 2026.

What are the upcoming charges for electric vehicles I should know about?

From April 2028, a mileage-based road tax charge of approximately 3p per mile will apply to electric vehicles. For average mileage of 8,500 miles per year, this equates to roughly £255 annually. This does not affect the company car BIK calculation.

Does the Expensive Car Supplement apply to the Tesla Model 3?

From April 2026, the Expensive Car Supplement threshold for battery electric cars increases from £40,000 to £50,000. A Tesla Model 3 with a P11D value under £49,000 sits below this threshold. Vehicles above £50,000 attract an additional annual VED charge of £425.