Do I have to report my UK company car on my US tax return?

Yes. Personal use of an employer-provided vehicle is compensation and belongs in gross income under IRS Publication 15-B. What you report is the value of the personal use element under a US valuation method, not the cash equivalent shown on your P11D. Business use is generally excludable as a working condition fringe, so the personal and business split has to be established and evidenced before any figure is entered on the return.

Can I just use the P11D figure as my US income?

No, and it is rarely close. The UK cash equivalent is the car's statutory list price plus accessories, less capital contributions capped at 5,000 pounds, multiplied by a percentage set by carbon dioxide emissions. It ignores your actual mileage and the actual cost of running the car. The US figure values personal use at fair market value or under a special valuation rule. The two measure different things, and using the P11D can add tens of thousands of dollars of compensation you never received.

How is the UK car fuel benefit charge treated on a US return?

Separately, and on actual cost. GOV.UK applies a fixed multiplier, 29,200 pounds for the 2026 to 2027 tax year, times the same appropriate percentage, regardless of how much private fuel you used. The US values employer-provided fuel at fair market value. The 5.5 cents per mile safe harbour in Publication 15-B applies only to miles driven in the United States, Canada or Mexico, so it is unavailable for UK driving and the fuel element must be built from actual cost.

My company car is electric, so my UK tax is tiny. Is my US tax also small?

Usually not, and this is the most common surprise. GOV.UK gives the appropriate percentage for zero-emission cars as 3 percent for 2025 to 2026 and 4 percent for 2026 to 2027, against a maximum of 37 percent. The US has no emissions-based reduction. The Annual Lease Value table is keyed to fair market value alone, so an expensive electric car produces a large US inclusion while producing a very small UK cash equivalent.

My employer payrolls the benefit and I have no P11D. What do I use?

Ask for the payslip or payroll breakdown showing the notional car and fuel amounts included in taxable pay, and unwind them from the P60 figure before it reaches your US wage line. Otherwise you import the whole UK cash equivalent without noticing. This will become the normal position: GOV.UK confirms no new payrolling registrations from 6 April 2026, and HMRC has announced that mandatory payrolling will be phased in from April 2027, with company cars and car fuel in the first phase.

Can I claim a foreign tax credit for the UK tax on my company car?

Yes, subject to the ordinary Form 1116 limitation. The difficulty is attribution rather than entitlement, because the UK tax on the benefit is not separately shown anywhere: it is collected through your PAYE code or your self assessment liability. You need a reproducible method for attributing UK tax to the benefit, and a schedule tying the UK cash equivalent and the US inclusion together so the credit position can be followed by a reviewer.

US Tax on a UK Company Car Benefit: Filing It Right

US tax on a UK company car benefit is not the number on your P11D, and treating it as though it were is the single most common error we correct in US UK tax returns preparation for executives and owner-managers in Britain. HMRC computes a notional annual figure from the car's list price and its carbon dioxide emissions. The Internal Revenue Service does something entirely different: it asks how much personal use you actually took from an employer-provided vehicle and values that use under its own rules. Two revenue authorities, two formulas, one car, and almost never the same answer.

A senior UK package frequently carries a car with a six-figure list price and fully funded private fuel, and the UK cash equivalent on those facts runs to tens of thousands of pounds. Import that figure onto your Form 1040 wage line and you may be paying US tax on compensation you never received. Our general treatment of UK employer benefits is set out in our article on US tax return preparation for expats and UK benefits in kind. This piece takes the car and fuel charge alone, down to the mechanics.

What is the US tax on a UK company car benefit, precisely?

Definition: US tax on a UK company car benefit is the federal income tax charged on the fair market value of the personal use element of an employer-provided vehicle, determined under the valuation rules in IRS Publication 15-B, and it is legally independent of the cash equivalent HMRC charges under the UK company car benefit code. The UK charge is formula-driven and turns on availability. The US charge is use-driven and turns on valuation. Neither figure is evidence of the other, so a cross-border file needs two computations and a reconciliation explaining why they differ.

How does HMRC build the UK company car cash equivalent?

The UK figure is arithmetic, not judgement. GOV.UK and P11D Working Sheet 2 set out the build-up, and every step is a statutory input rather than an estimate of value received.

Start with the price of the car: the UK list price on the day before first registration, including VAT, delivery charges and number plates. This is not what the employer paid, and a fleet discount does not reduce it.
Add accessories fitted at the outset, and later replacements at or above the relevant threshold, each at list price including VAT and fitting.
Deduct any capital contribution the employee made towards the cost of the car and accessories, capped at 5,000 pounds.
Multiply by the appropriate percentage, set by the car's carbon dioxide emissions. GOV.UK confirms the exact emissions figure is rounded down to the nearest 5 grams per kilometre, and that the maximum appropriate percentage is 37 percent.
Reduce for days in the tax year when the car was genuinely unavailable, and for payments the employee is required to make, and does make, for private use.

Note what is absent. Nothing in the UK computation asks how many private miles you drove, what fuel cost, or whether you used the car at all. A car available throughout the tax year produces a full charge whether you drove ten thousand private miles or none. That design feature is the origin of most of the divergence with the US return.

What is the separate UK car fuel benefit charge?

Where the employer meets the cost of fuel for private journeys and is not fully reimbursed, a second and entirely separate charge applies. GOV.UK sets a fixed multiplier for each tax year, multiplied by the same appropriate percentage that applied to the car itself. For the 2026 to 2027 tax year the car fuel benefit charge multiplier is 29,200 pounds. Verify the multiplier for the year you are preparing, because it is uprated most years and the wrong year's figure invalidates both sides of the reconciliation.

The fuel charge is all or nothing. There is no proportionate reduction for modest private mileage. It falls away only if the employee makes good the whole cost of private fuel, and a partial reimbursement gives no relief at all. For a van the 2026 to 2027 charges are 4,170 pounds and 798 pounds respectively.

How does the IRS value an employer-provided vehicle?

IRS Publication 15-B starts from a different premise. Personal use of an employer-provided vehicle is compensation and belongs in gross income, while business use is generally excludable as a working condition fringe on the reasoning that you could have deducted the cost had you borne it yourself. So the first US question is not what the car is worth but what proportion of its use was personal. Having split use, the value of the personal element is found under the general valuation rule, which is fair market value, or under one of three special valuation rules.

Cents-per-mile rule. Personal miles are valued at the business standard mileage rate. The vehicle must be in regular business use or driven at least 10,000 miles in the year and used primarily by employees, and its value when first made available for personal use in 2026 cannot exceed 61,700 US dollars. The 2026 business standard mileage rate is 72.5 cents per mile, increased to 76 cents per mile with effect from 1 July 2026.
Commuting rule. Each one-way commute is valued at 1.50 US dollars. It requires a written policy, a bona fide noncompensatory business reason for the vehicle, and no personal use beyond commuting and de minimis use. It is not available to control employees, which excludes most readers of this page.
Annual Lease Value rule. The vehicle's fair market value on the first day it is made available for personal use is taken to a table in the regulations, which yields an annual lease value. Where fair market value exceeds 59,999 US dollars, the annual lease value is 0.25 multiplied by fair market value, plus 500 US dollars. The personal use percentage is then applied to that figure.
General valuation rule. Fair market value of the benefit, meaning what it would cost at arm's length to lease a comparable vehicle on comparable terms.

Two features of the Annual Lease Value rule carry real weight for a cross-border file. Annual lease values are built on a four-year lease term, so the figure is recalculated at the start of the fifth year rather than annually. And the value covers maintenance and insurance but expressly excludes fuel, which must be valued and added separately.

Why the P11D cash equivalent is the wrong number for Form 1040

Put the two systems side by side and the mismatch is structural rather than incidental. The UK figure is a percentage of a statutory list price that ignores actual use and actual cost. The US figure is a valuation of use that ignores list price except as an entry point to a dollar lease value table. No exchange rate reconciles them, because they are not measuring the same thing. Nor is the direction of the error constant: a high list price car used mainly for business produces a UK charge far above the US inclusion, while a modest car used almost entirely privately can produce the reverse. A preparer who assumes the P11D is always the higher figure will eventually understate a return.

Which US valuation method actually survives a UK fact pattern?

This is where general commentary stops and the work begins, because each special valuation rule has conditions that a British fact pattern strains. The cents-per-mile rule is often unavailable on value alone, because a vehicle first made available for personal use in 2026 must not exceed 61,700 US dollars and the cars that generate large P11D figures routinely exceed it. Even where the value and 10,000-mile tests are met, the rate is calibrated to American running costs, so applying it to British fuel and servicing is a position that must be supported rather than a convenient default. The commuting rule is effectively closed to this audience: it is unavailable to control employees and requires no personal use beyond commuting, which a senior UK package almost never restricts.

That leaves the Annual Lease Value rule and the general valuation rule as the realistic candidates, and the annual lease value approach is usually the more defensible because it is table-driven and reproducible. The critical input is fair market value in dollars on the first day the car was made available, which for a UK vehicle means building an arm's length UK price and translating it. That figure then governs for four years.

Why the US fuel safe harbour does not reach a car driven in Britain

Here is a point almost nobody makes, and it changes the fuel computation entirely. Publication 15-B permits employer-provided fuel to be valued at 5.5 cents per mile, but that safe harbour is expressly limited to miles driven in the United States, Canada or Mexico. A car driven on British roads is outside it.

So the US fuel element cannot be short-cut. It must be valued at fair market value, meaning the actual cost of the private fuel your employer met, built from pump prices in sterling and translated. Set that against the UK treatment, which charges a fixed 29,200 pounds for 2026 to 2027 times the appropriate percentage whether you burned five hundred pounds of private fuel or five thousand. The UK charge is deliberately blunt to discourage the benefit; the US charge tracks what you consumed. On a low private mileage file the UK fuel charge can exceed the US fuel inclusion by an order of magnitude, and the reconciliation has to show that plainly.

Availability versus use: the gap a P11D cannot show

The UK charges on availability; the US charges on use. Take an executive seconded to a US office for four months who leaves the car on a British driveway, insured and taxed and available. The UK reduces the cash equivalent only for days the car was genuinely unavailable, and mere non-use is not unavailability, so the P11D charge continues. The US inclusion is driven by personal use that did not happen, so the correct US answer is materially lower. Holding that position needs contemporaneous evidence of the secondment dates alongside the mileage record.

Where electric and low-emission cars break the parallel entirely

The UK has used the appropriate percentage as a policy lever, and the effect on cross-border files is pronounced. GOV.UK gives the appropriate percentage for zero-emission cars as 3 percent for 2025 to 2026 and 4 percent for 2026 to 2027, against a maximum of 37 percent for the highest emitting cars. A very expensive electric car can therefore produce a strikingly small UK cash equivalent.

The US has no emissions-based reduction for this purpose. The Annual Lease Value table is keyed to fair market value alone, and an expensive electric car has a high fair market value. The result is the inversion that catches people out: the vehicle that costs almost nothing in UK tax can produce the largest US inclusion in the whole package. GOV.UK also operates a transitional treatment for certain plug-in hybrids first registered within a defined window, so check the registration date before assuming a hybrid's percentage, and confirm every percentage against the tax year you are preparing.

A worked scenario: one car, two numbers

The figures below are illustrative and show the mechanism, not a result for any particular vehicle or year.

A US citizen employed by a UK company has a car with a UK list price of 62,000 pounds including VAT and delivery, one accessory at 1,500 pounds, and a capital contribution of 5,000 pounds. Its emissions place it at the maximum appropriate percentage of 37 percent for 2026 to 2027, and the employer meets all fuel. The employee drove 15,000 miles, of which 9,000 were personal, evidenced by a contemporaneous log.

UK price of the car: 62,000 plus 1,500 less 5,000, giving 58,500 pounds.
UK car benefit cash equivalent: 58,500 at 37 percent, giving 21,645 pounds.
UK car fuel benefit: 29,200 at 37 percent, giving 10,804 pounds.
Total UK cash equivalent on the P11D: 32,449 pounds, which at an illustrative 1.30 is about 42,184 US dollars.
US fair market value when first made available, illustratively 80,600 US dollars. Annual lease value: 0.25 of 80,600 plus 500, giving 20,650 US dollars.
Personal use fraction of 9,000 over 15,000, that is 60 percent, applied to the annual lease value: 12,390 US dollars.
Private fuel valued at fair market value because the 5.5 cents per mile safe harbour does not reach UK miles: 9,000 personal miles at an illustrative cost giving about 1,872 US dollars.
Total US inclusion: about 14,262 US dollars.

The P11D figure is roughly three times the correct US inclusion. A preparer who transcribed it onto the wage line would have added close to 28,000 US dollars of phantom compensation, distorting the foreign earned income exclusion and every limitation that runs off adjusted gross income.

How the four-year lease value lock widens the gap each year

The second point competitors miss is what happens over time. The UK cash equivalent is recomputed every April, in sterling, against a percentage table that has ratcheted upward year on year. The US annual lease value is fixed from a dollar fair market value captured on one historic day and held for a four-year lease term, with a recalculation only at the start of the fifth year. The two figures therefore diverge in a predictable direction across the life of the same car, for reasons that have nothing to do with the car. Year one might be close; by year three the UK figure has climbed with the percentage table while the US figure has not moved. Prepare the reconciliation once and roll it forward with only the exchange rate and the appropriate percentage updated, and diarise the fifth-year recalculation, because no UK event will remind you.

How does the benefit flow into Form 2555 and Form 1116?

The personal use inclusion is compensation for services performed abroad, so it is foreign earned income for Form 2555 purposes and it consumes exclusion capacity alongside your salary and bonus. The foreign earned income exclusion for 2026 is 132,900 US dollars, and on a senior UK package the salary alone usually absorbs it, which means the car benefit is in practice sheltered by foreign tax credits rather than by the exclusion.

For Form 1116 the discipline is attribution. The UK tax on the car and fuel charge is not separately identified on any HMRC document; it is embedded in the PAYE deducted through your code number or in the self assessment liability, so to claim it you have to attribute it reproducibly. The mismatch in the underlying amounts does not prevent a credit, but it does mean UK tax on a 32,449 pound benefit supports a credit against a US inclusion of a very different size. That is normal, and it is exactly the position whose workings need retaining rather than reconstructing under examination.

Payrolled benefits, P11D reporting, and your US wage figure

Where the employer payrolls the car benefit, the cash equivalent is put through PAYE in real time and there is no P11D for that benefit. Your P60 then shows a taxable pay figure that already contains the UK notional car charge. Take that P60 figure to the US return unadjusted and you have imported the entire UK cash equivalent by the back door, without ever seeing a P11D. This is the quieter version of the same error, and it is harder to spot.

The direction of travel makes this urgent rather than theoretical. GOV.UK confirms that from 6 April 2026 employers can no longer register to payroll benefits. HMRC has separately announced that mandatory payrolling will be phased in from April 2027, with company cars, car fuel, vans, van fuel and employer-provided medical benefits in the first phase. Company cars are therefore in the first wave, so increasingly the P11D will not exist for a car and the US preparer's starting point becomes a payslip breakdown that has to be unwound. Where benefits remain on P11D, the employer files P11D and P11D(b) with Class 1A National Insurance by 6 July following the tax year.

Does salary sacrifice change the UK figure, and does it change the US one?

Where the car is provided under an optional remuneration arrangement, the UK charge is broadly the greater of the normal cash equivalent and the amount of salary given up, which frequently pushes the UK figure above the emissions-based number. GOV.UK is explicit on the exception: for cars with carbon dioxide emissions of no more than 75 grams per kilometre, the normal benefit in kind earnings charge always applies, so low-emission cars sit outside the comparison.

There is no US equivalent. Salary irrevocably given up before it was earned is generally not US wages, and the vehicle received instead is valued as a fringe benefit under the ordinary rules. A sacrifice that is revocable, or that operates as a deduction from pay already earned, is not a sacrifice at all for US purposes. The documentation, not the label, decides the answer.

What changes for a US person who directs their own UK company?

For an owner-director the same person signs the P11D and the Form 1040, which removes the comfort of an independent employer record. The personal use percentage is corroborated by nobody, so a contemporaneous mileage log stops being good practice and becomes the whole of the evidence. The valuation method is chosen by the taxpayer, and once a special valuation rule is adopted for a vehicle it must be applied consistently for that vehicle, so a method picked for convenience in year one governs the rest. The fair market value entered into the annual lease value table is self-determined and needs an arm's length source on file.

There is also a reporting dimension. A US person who owns or controls the UK company will usually have Form 5471 obligations, and the vehicle costs sit in the company accounts feeding the earnings and profits computation. The car is not only a personal compensation item; it is a line in a corporate computation that has to agree with the personal return.

What records substantiate the US number when all you have is a P11D?

The P11D tells the IRS almost nothing it wants to know. It states a statutory list price and a percentage, not personal mileage, fuel cost, or the date the vehicle was first made available. A US file relying on it alone is unsupported.

A contemporaneous mileage log separating business from personal miles, kept as you go rather than reconstructed at year end.
The date the vehicle was first made available to you for personal use, which fixes the annual lease value for four years.
An arm's length UK price for the vehicle at that date, and the exchange rate used to translate it, with the source of both.
Fuel records: what the employer paid, what was private, and any reimbursement you made.
The P11D or, where the benefit is payrolled, the payslip breakdown showing the notional car and fuel amounts included in taxable pay.
A written note of the valuation method adopted and why, retained for consistency in later years.
The reconciliation schedule showing the UK cash equivalent, the US inclusion, and why they differ.

Where this fits in your US UK tax returns preparation

A UK company car is one of the few benefits where the two systems do not merely apply different rates to the same measure; they measure different things. The UK measures availability of a statutory value, the US measures personal use at fair market value. Preparation means running both computations, documenting the personal use fraction, and keeping a reconciliation a reviewer could follow without you in the room. Do that once and it rolls forward for the life of the car.