A company car for directors is taxed exactly as a company car for any employee: the car is a benefit in kind valued from its list price and CO2 band, the director pays income tax on the cash equivalent at their marginal rate, and the company pays Class 1A National Insurance on the same figure. What is different is that the director bears both sides, because the company's money is theirs, and so the decision is sharper: the car pays when the combined tax on the benefit is less than what the director would pay to run the same car from taxed income, and it does not when it is more. This page works the director's case, with the calculator and the allowance worksheet on this site doing the arithmetic.
Both sides of the ledger
The director pays income tax on the cash equivalent at their marginal rate, collected through their code. The company pays Class 1A at HMRC's rate of 15 percent on the same cash equivalent, by 22 July after the tax year, and reports it on the P11D by 6 July. Add the two and that is the annual tax cost of the car as a benefit, before the company's own tax treatment of buying or leasing it, which is the accountant's subject.
The case where it pays
A fully electric car at HMRC's 4 percent of P11D value costs a higher-rate director income tax of a few hundred pounds a year on a mid-priced car, and the company a similar sum in Class 1A, while the company bears the whole cost of the car. Against running the same car from dividends or salary that have already borne tax, the benefit route usually wins, which is why so many directors' cars are electric.
The case where it does not
A petrol or diesel car at or near HMRC's 37 percent cap costs a higher-rate director income tax on more than a third of the list price every year, plus Class 1A, for a car the company also has to pay for. Private fuel paid by the company adds a fuel benefit worked from a fixed multiplier at the same percentage. For most such cars, a cash allowance or a personally owned car with business mileage at the approved rate is cheaper, and the allowance worksheet on this site shows the comparison.
The record the director keeps
The same as any employer's: P11D value, CO2 and range, fuel type and RDE2 status, the dates available, any capital contribution and private-use payments, and the director's rate. A one-director company still files a P11D and pays Class 1A on the car, and the reminders before 6 July and 22 July are the part a busy director misses.
Questions people ask about company car for directors
Can a director choose a car with no benefit in kind?
Only a car with no private use at all, prohibited and in fact not used privately, or a pool car, escapes the charge. A car kept at home is available for private use whether or not it is used.
Is it better for the director to buy the car personally?
For a high-percentage car, often yes: the director then claims business miles at the approved rate and pays no benefit tax. For a low-percentage electric car the company route usually wins. The allowance worksheet works your figures.
Does Carbikly work the company's tax relief on the car?
No. It works the benefit in kind, the director's tax, the Class 1A and the mileage, and keeps the record. Capital allowances and corporation tax on the purchase are the accountant's, and dividvo.com's calculators cover the company's wider tax.