You're offered a familiar package. Keep the company car, take a cash allowance instead, or sort your own vehicle and put the cost through business mileage. Most directors treat this as a lifestyle choice. That's a mistake.
This is a tax decision first and a motoring decision second. Get it wrong and you can lock yourself into a worse after-tax outcome for years. Get it right and you keep more of the company's money in your own pocket, without doing anything aggressive.
The old company car or cash allowance debate has changed. Electric vehicles have changed it. HMRC mileage rules matter more than most directors realise. And the headline allowance figure almost always looks better than the net result.
The Director's Dilemma Company Car or Cash Allowance
You're a limited company director. The business needs you mobile. Meetings, client visits, site trips, networking, airport runs, or a practical way to get around without using your own cash badly.
Then the choice lands in front of you. Take a company car. Take a cash allowance. Or deal with it yourself.
Here's the problem. These options don't get taxed in the same way, and they don't create the same cash pressure on you personally. A company car may look expensive because it creates a taxable benefit. A cash allowance may look attractive because it appears as extra pay. In practice, the allowance can melt away once PAYE, income tax and NICs hit it, while the company car route can become surprisingly efficient if the car is electric.
A lot of directors are facing this choice because the market has shifted. HMRC-linked reporting says there were 870,000 company car drivers in 2018 to 19, reflecting a broader move away from employer-owned cars and towards cash-based remuneration, as noted in this UK company car market summary.
Quick comparison
| Option | How you're taxed | Who pays running costs | Best fit |
|---|---|---|---|
| Company car | Benefit-in-Kind tax | Usually the company | Directors who want simplicity or can access an EV |
| Cash allowance | Salary through PAYE | You | Directors who want flexibility and can absorb the costs |
| Personal car plus mileage claims | Mileage relief route | You, partly offset by mileage claims | Directors with irregular or modest business mileage |
Don't compare the gross allowance to the monthly lease on a car. Compare the after-tax cash left to the full personal cost of driving.
If you want the blunt answer upfront, here it is. For many directors in the UK now, the smartest default is no longer “take the cash”. It's either an electric company car or your own car with mileage claims, depending on the amount of business driving you do.
Fundamental Tax Rules for Each Option
The tax treatment is where this decision is won or lost.
Cash allowance means salary
A cash car allowance is normally treated as extra salary. That means it goes through PAYE and is subject to income tax and employee NIC, as explained in Perkbox's guide to car allowances.
That sounds simple, and it is. But simple doesn't mean efficient.
If you're already a higher-rate taxpayer, a chunk of that allowance never reaches your bank account. Then you still have to buy, lease, insure, maintain and eventually replace the car from what remains. Directors often focus on the allowance figure and ignore the fact that it is just taxable cash.
Company car means Benefit-in-Kind
A company car is not taxed like salary. It's taxed under the Benefit-in-Kind, or BiK, rules.
That means HMRC doesn't ask, “How much cash did you receive?” It asks, “What is the taxable value of the benefit of having this car?” That taxable value depends mainly on the vehicle's list price and CO2 emissions.
Think of it this way:
- Cash allowance means tax on cash paid to you
- Company car means tax on a calculated benefit value
- Result means the cheaper option depends on the type of car, not just the sticker price
Why directors need to care
This difference matters more for directors than for ordinary employees because your overall remuneration is often planned carefully across salary, dividends and benefits. A car allowance drops straight into taxable pay. A company car sits in a different tax bucket.
Practical rule: If two options solve the same transport need, the one with the lower after-tax personal cost wins. Ignore labels like “benefit” or “allowance”.
Here's the strategic takeaway.
| Tax treatment | Cash allowance | Company car |
|---|---|---|
| Enters payroll as salary | Yes | No |
| Subject to income tax and employee NIC | Yes | Not as salary |
| Depends on vehicle emissions | No | Yes |
| Outcome changes with vehicle choice | Very little | A lot |
That last row is the one that matters. If you're comparing company car or cash allowance and you haven't looked at emissions, you haven't really compared them at all.
How a Company Car Impacts Your Finances
A company car can either be a tax drag or a very efficient benefit. The difference comes down to the car itself.
The director's side of the equation
Your personal tax bill on a company car turns on the car's list price, its CO2 emissions, and whether fuel is involved. That is why an expensive low-emission car can sometimes produce a better personal result than a cheaper petrol one.
The common mistake is to look at the monthly finance cost and stop there. That's not the complete comparison. The essential comparison is the personal tax cost to you versus what the company covers on your behalf.
With a company car, the company normally takes responsibility for:
- Ownership or lease commitments
- Insurance and administration
- Maintenance and servicing
- Depreciation risk
You don't carry those costs personally in the same direct way you would under a cash allowance arrangement.
The company's side of the equation
For the company, this is an overhead and an administrative choice. It can also be part of wider remuneration planning.
A company car gives the business more control. It can standardise policy, manage what vehicles are used, keep insurance and maintenance centralised, and avoid a patchwork of private vehicle arrangements. If you want to understand the alternative route for business travel reimbursements, it helps to compare it with the mileage allowance rules for business use.
That control matters if you care about clean records and predictable operating procedures. It matters even more if more than one person in the business drives regularly.
Where company cars work well
A company car tends to make sense in three situations:
You drive a lot for business and want no personal hassle
The company takes the admin burden off your desk.You want predictable motoring costs
You are trading flexibility for simplicity.The vehicle is low-emission or electric
As a result, the tax maths can swing hard in your favour.
A petrol or diesel company car can still be expensive personally. A company car is not automatically efficient. The vehicle choice decides the outcome.
Where company cars work badly
A company car becomes weaker when the taxable benefit is high but your actual business need is light. If you barely travel for work, paying tax on a provided vehicle can feel pointless. In that case, a personal car with mileage claims may be cleaner and cheaper.
So the right question isn't, “Do I like the idea of a company car?” The right question is, “Does this particular vehicle create a lower total personal cost than the alternatives?”
How a Cash Allowance Affects Your Pay
A cash allowance feels flexible because the money lands in payroll and you choose the car yourself. For a director, that apparent freedom often comes with the worst tax treatment of the three options.
A cash allowance is salary. HMRC taxes it as salary. That means the headline amount matters far less than what reaches your bank account after Income Tax and employee NIC.
The net figure is the only figure worth using
If the company offers you a car allowance, treat it as extra gross pay and run the numbers properly. The allowance has to survive:
- Income tax
- Employee NIC
- Your actual motoring costs
Then you fund the car personally. That includes lease or finance payments, insurance, servicing, tyres, repairs, and depreciation. The company has shifted the cost and risk onto you.
That is why directors regularly overvalue a cash allowance. They focus on the gross amount and ignore the personal spend that follows.
Cash allowance is usually the weakest middle ground
A company car gives you a funded vehicle but may create a BiK charge. A personal car with mileage claims can keep payroll cleaner if business use is modest. A cash allowance often combines the worst parts of both. Full taxation up front, then private responsibility for every running cost.
For many limited company directors, that makes cash allowance the option to challenge first, not accept first.
The third option most directors miss
The true comparison is not just company car versus cash allowance. It is:
- Company car
- Cash allowance
- Personal car plus business mileage claims
That third route is often the better answer if you already own a suitable car and your business mileage is not high enough to justify a dedicated company vehicle.
If you use your own car for work, you may be able to claim under the Approved Mileage Allowance Payments regime. HMRC's approved rates can make this surprisingly efficient because you are reimbursed for business travel without turning the whole arrangement into extra taxable salary. If you want the wider tax position on low-emission vehicles as part of that comparison, see this guide to electric vehicle tax rules for UK companies.
When personal car plus AMAP is stronger than cash
This route often works well if:
- Your business mileage is moderate or irregular
- You already own a reliable personal car
- You want to avoid inflating your payroll income
- You do not want to pay tax on a company-provided car you barely need
A taxable cash allowance can easily become the weakest option of the three.
This is the most overlooked part of the decision. Directors often compare a taxable allowance with a high-BiK petrol car and miss the structure that produces the better net result. That mistake matters even more now that low BiK electric cars have changed the old company car versus cash allowance calculation.
The Electric Vehicle Advantage
The old company car or cash allowance calculation breaks down once you introduce an electric vehicle.
Why EVs change the answer
The UK tax regime heavily favours zero-emission company cars. As noted in this overview of car allowance versus company car decisions, BiK rates for EVs are held at extremely low levels compared with petrol or diesel equivalents.
That means a director can receive a car with a meaningful real-world value while suffering a much lower personal tax charge than they would on a conventional company car.
For many directors, that flips the answer completely. A cash allowance may still be fully taxable salary. A petrol company car may still create an unattractive taxable benefit. An electric company car can sit in the sweet spot.
Why this matters in practice
An EV company car can solve several problems at once:
- Lower personal tax exposure under BiK rules
- No need to fund the vehicle personally
- No need to rely on a taxable allowance that may not cover all costs
- A modern remuneration benefit that can be easier to justify commercially
If you want a broader view of how this fits into director planning, see this guide to electric vehicles and tax planning.
Here's a useful explainer before you decide:
My view on the current market
If your company can provide an EV and your driving pattern suits one, this should usually be the first option you test.
Not because EVs are fashionable. Because the tax treatment is unusually favourable and that directly affects your net outcome. Directors who still compare only petrol company cars against cash allowances are using an outdated framework.
Ignore EVs in this decision and you risk choosing from the wrong shortlist.
Worked Examples Comparing Take-Home Pay
A director is offered three routes. Take a taxable cash allowance. Take a petrol company car. Take an electric company car. There is also a fourth practical move that often gets missed. Keep your own car and claim mileage only.
That last option matters because this is not really a simple car versus cash decision. For many limited company directors, the relevant comparison is company car, taxable cash, or personal car plus Approved Mileage Allowance Payments.
Start with a realistic allowance figure. As noted earlier, company car policies often use annual cash allowances in the mid-thousands, so £7,000 is a sensible working example. Before you compare options, run the extra salary through a salary after tax calculator for UK directors and employees. It gives you a quick view of what lands in your bank account.
Comparison table
| Metric | Cash Allowance (£7,000) | Petrol Company Car (£35k) | EV Company Car (£40k) |
|---|---|---|---|
| Tax basis | Salary through PAYE | BiK on car benefit | BiK on car benefit |
| Upfront personal cash received | Yes, but fully taxable | No | No |
| Personal exposure to running costs | High | Low if covered by company | Low if covered by company |
| Sensitivity to CO2 emissions | None | High | Very high, usually favourable |
| Best use case | Flexibility if costs stay low | Convenience, usually at a tax cost | Strong tax position for many directors |
Option one. Cash allowance
You take the £7,000 allowance and buy, lease, or run the car personally.
The gross figure looks attractive. The net figure is what counts. The allowance is taxed as pay. Employee NIC can apply. Employer NIC can apply through the company. Then you still pay for the car from post-tax income, including lease payments, insurance, servicing, tyres, and repairs.
That is why directors regularly overvalue the allowance. They focus on the headline amount and ignore how much disappears in tax before any motoring cost is met.
Cash works if you already have a cheap personal car arrangement or you want full control and can keep costs tight. It works badly if the allowance is the only reason you are taking on a car personally.
Option two. Petrol company car
You take a petrol company car with a list price of £35,000.
This shifts the vehicle cost to the company, which can feel cleaner. The tax problem sits in the BiK calculation. A petrol car with a higher emissions percentage can produce a large taxable benefit, and that charge can wipe out much of the convenience. The company also faces Class 1A NIC on the benefit.
For a director, this is usually the weakest route unless the commercial need is strong and the numbers still stack up after tax. A petrol company car is often chosen for convenience, not for net efficiency.
Option three. EV company car
You take an electric company car with a list price of £40,000.
This is the option that changes the whole analysis. The list price is higher, but the BiK rate is far lower than for a petrol car. That can leave you with a much smaller personal tax charge while the company still funds the vehicle.
In practice, this often beats both the petrol company car and the cash allowance. The old logic was simple. Company car bad, cash good. That logic is out of date for directors who can run an EV through the company.
Option four. Personal car plus AMAP
You keep your own car and do not take a taxable allowance just for the sake of it.
If your business mileage is modest or irregular, this can be the cleanest answer. You avoid a BiK charge. You avoid extra taxable salary. The company reimburses qualifying business miles at the approved mileage rates, and that can be more efficient than taking cash that gets taxed before you spend it.
This route is often ignored because it feels less like a formal benefit. Financially, it can be the sensible middle ground.
What these examples usually show
The pattern is usually clear:
- EV company car often gives the best net result where the company can provide one.
- Personal car plus mileage claims is often next best where business mileage is not consistently high.
- Cash allowance only wins if your personal motoring costs are low enough after tax.
- Petrol company car is usually the weakest answer on pure tax efficiency.
The right question is not which option looks better on paper. It is which option leaves you with the strongest net position after Income Tax, NICs, BiK, and real running costs.
Directors who compare only cash against a petrol company car are using the wrong shortlist. The EV option, and sometimes the personal car plus AMAP route, changes the answer completely.
Choosing the Right Path for Your Company
The right answer depends less on what you prefer driving and more on how the numbers fall after tax.
Use this decision filter
Ask yourself five direct questions:
How much business mileage do you really do
If it is irregular or modest, your own car plus mileage claims may be cleaner than either a company car or cash allowance.Can the company provide an electric vehicle
If yes, test that option first. For many directors it is now the strongest tax answer.Do you want simplicity or control
A company car removes personal admin. Cash gives freedom but shifts cost risk onto you.Will the allowance cover your real motoring cost after tax
Don't guess. Work it through properly.Are you choosing based on the gross figure rather than the net position
If yes, stop and recalculate.
My recommendation
For most limited company directors, I'd use this order of preference:
- Test an EV company car first if the company can support it.
- Test personal car plus mileage claims second if your business travel is not consistently high.
- Use a cash allowance only when the numbers still work after tax and after running costs.
- Choose a conventional company car mainly for convenience, not because you assume it is tax-efficient.
The operational trade-off is straightforward. A company car centralises administration with the employer, while a cash allowance gives the business a simple payroll cost but pushes the risk and running costs onto the driver, as outlined in this fleet guidance on company cars versus cash allowance.
If you're making this choice inside your own limited company, don't settle for a rough guess. This is one of those decisions where a quick tax review can stop years of unnecessary leakage.
If you want help reviewing your company car or cash allowance decision as a director, Tax Compass gives you clear UK-focused guidance on remuneration strategy, EV tax planning, mileage claims and take-home pay comparisons, so you can make the choice based on net financial impact rather than headline figures.