US Tax Return Preparation for Expats: UK Benefits in Kind

UK benefits in kind reported to HMRC on a P11D or through payrolling are part of your worldwide income and must be reflected on Form 1040 — but almost never at the HMRC cash-equivalent figure. US tax return preparation for expats requires each benefit to be re-measured under US rules, re-apportioned to the calendar year, and reconciled against payrolled amounts already inside your P60.

This is one of the most consistently mishandled areas in cross-border compliance. A UK-based executive with private medical cover, a company car, a beneficial loan and a handful of payrolled perks has, on the UK side, a perfectly clean record: the employer filed the P11D, HMRC assessed the benefit, the tax was collected through an adjusted PAYE code. On the US side, those same items frequently appear nowhere at all — or appear as a single lump sum bolted onto wages, which is equally wrong. Jungle Tax sees both failure modes weekly, and both create the same problem when unfiled years have to be reconstructed.

Why do UK benefits in kind disappear from US returns?

The structural reason is that the UK and the US collect the same information through entirely different channels, and the US channel does not exist for a foreign employer.

A US employee receiving taxable fringe benefits sees them added to Box 1 of a Form W-2. The employer does the measurement, the payroll system does the aggregation, and the number arrives on the employee's desk pre-calculated. A US citizen employed by a UK company receives no W-2. They receive a P60 showing gross pay and tax deducted, and — depending on how the employer administers benefits — either a P11D, or nothing at all because the benefits were payrolled.

From there, three things go wrong:

• The P11D is treated as a UK-only document. It arrives in July, after the US filing season, is filed away as "HMRC paperwork," and never reaches whoever prepares the 1040.
• Payrolled benefits are invisible. When a benefit is payrolled, its cash equivalent is folded into taxable pay and reported through the Full Payment Submission. There is no P11D. The value sits silently inside the P60 gross figure with nothing to flag it.
• The P11D total is added to wages verbatim. This is the sophisticated-sounding mistake, and it is still wrong. The HMRC cash equivalent is a statutory formula. It is not a US fair market value, and for several benefit classes the correct US figure is materially different — sometimes zero.

The third point is the one that matters most, and it is the point that generalist expat filing guides do not make. Getting benefits in kind onto a 1040 is not a transcription exercise. It is a re-measurement exercise.

The core principle: the P11D cash equivalent is not the US number

HMRC values most benefits by statutory formula under ITEPA 2003. The US values them under IRC §61 and the fringe benefit regulations, which start from fair market value and then apply a set of statutory exclusions that have no UK analogue. The two systems reach the same conclusion on some items, wildly different conclusions on others, and — critically — the US sometimes reaches nil where the UK reaches a substantial charge.

Benefit	UK / HMRC treatment	US / IRS treatment	Practical effect
Private medical insurance	Taxable benefit; cash equivalent is the premium cost. Reported on P11D or payrolled. Class 1A NIC for the employer.	Employer-provided accident and health plan coverage is generally excluded from gross income under IRC §106, and the statute does not require the employer to be domestic.	Frequently a UK charge with no matching US income. The single largest source of over-reporting.
Company car and car fuel	List price multiplied by a CO2-based appropriate percentage, plus a separate fuel benefit multiplier. Availability-based, not usage-based.	Value of personal use only, under Reg. §1.61-21 — annual lease value, cents-per-mile, or the commuting rule. Business use is excluded as a working condition fringe.	Two unrelated numbers. A heavily business-used car can carry a large UK charge and a modest US one.
Beneficial (interest-free or cheap) loan	Charge on the difference between interest paid and HMRC's official rate. Exempt where the aggregate balance stays below the de minimis threshold.	Below-market compensation-related loan rules under IRC §7872, measured against the applicable federal rate, with its own de minimis rules.	Different rate, different threshold, different timing. Neither figure substitutes for the other.
Employer-paid tax return preparation / tax equalisation	Taxable benefit; often grossed up under a tax equalisation policy.	Taxable compensation. Gross-up amounts are themselves income.	Broadly aligned, but gross-up mechanics create compounding across years.
Living accommodation	Taxable on annual value plus an additional charge above the statutory cost threshold. Cannot be payrolled — always P11D.	Value of lodging, with a narrow exclusion under IRC §119 for lodging furnished on the business premises for the employer's convenience as a condition of employment.	The §119 test rarely helps a London executive; expect US income here.
Gym, staff entertaining, small perks	Taxable unless within a specific exemption (e.g. on-site facilities, trivial benefits).	De minimis fringe under §132(a)(4); on-premises athletic facilities under §132(j)(4).	Often nil both sides, but the exemptions do not map cleanly.
Relocation and removal costs	Statutory exemption for qualifying relocation expenses up to a fixed cap; excess is taxable.	Moving expense reimbursements are taxable compensation for most taxpayers following the 2017 Act.	A UK-exempt relocation package can be fully taxable in the US.

Read that table again with an unfiled-years mindset. If four years of returns are being reconstructed and private medical cover has been mechanically added to wages each year, the taxpayer has overstated US income four times over — and if the Foreign Earned Income Exclusion was near its cap, that overstatement may have produced real tax. Accuracy cuts both ways.

Private medical cover: the exclusion most preparers miss

This deserves its own treatment because it is where the money usually is. IRC §106 excludes from an employee's gross income employer-provided coverage under an accident or health plan. There is no domestic-employer requirement in the statute. A US citizen working for a UK plc whose employer pays a family private medical premium is, in the ordinary case, receiving excludable coverage for US purposes — notwithstanding that HMRC has charged the premium as a benefit in kind and the employer has paid Class 1A National Insurance on it.

The consequences run further than the income line. If the premium is not US gross income, it is not foreign earned income, so it does not belong on Form 2555. And the UK tax attributable to it requires thought under the expense allocation and apportionment rules before it is claimed as a credit on Form 1116. This is fact-sensitive — cash medical reimbursements, medical cash allowances and certain non-plan arrangements are treated differently from genuine insured coverage — and it is exactly the kind of position that should be documented at the time of filing rather than reverse-engineered under examination.

Beneficial loans: two regimes, one balance

Executive season ticket loans, relocation bridging loans and director's loans are the usual suspects. HMRC charges the shortfall between interest actually paid and interest at the official rate, subject to a de minimis aggregate balance. The US applies IRC §7872 to below-market compensation-related loans, imputing interest at the applicable federal rate, treating the foregone interest as compensation to the employee and interest income back to the employer.

Two practical points. First, HMRC's official rate and the AFR have diverged significantly in recent years, so the UK and US imputed amounts will not match. Second, employment-related loans are one of only two benefit categories that cannot be payrolled — they remain on a P11D. That makes them the most reliably documented benefit in a reconstruction, and a useful anchor when other records are thin.

Where do UK benefits in kind actually go on Form 1040?

Once each item has been measured under US rules, the mechanics are straightforward:

• Line 1 (or Line 1h, other earned income), Form 1040. Taxable non-cash compensation from a foreign employer is wages. There is no W-2, so it flows through the "other earned income" mechanism rather than a Box 1 figure.
• Form 2555. Non-cash income, allowances and reimbursements are reported separately from salary and are eligible foreign earned income where they represent compensation for services performed abroad. The Form 2555 instructions address noncash income and employer-provided property directly.
• Form 1116. UK income tax collected through an adjusted PAYE code on benefits is creditable general category tax, but it must be allocated to the income it relates to — which is why the medical cover analysis above has downstream effect.
• Schedule 1 / Form 8938 / FinCEN 114. Some benefit structures drag in additional reporting: employer share schemes, offshore-held deferred arrangements, and any employer loan account held with a foreign entity.

Note the interaction: the FEIE has an annual cap. Benefits in kind push earned income upward, and for a well-paid executive in London the salary alone typically exhausts the exclusion. In practice that means most benefit income for our client profile ends up sheltered — if at all — by foreign tax credits rather than the exclusion, which is why we generally build these files on a credit basis. Our note on cross-border tax planning sets out how that election choice compounds over multiple years.

How do you reconstruct benefits in kind across unfiled years?

This is the operational heart of the problem. A client presenting with four or five unfiled US years typically has partial UK records, a changed employer, and no idea what was payrolled versus P11D'd. Here is the sequence we use.

Step 1 — Establish which reporting mechanism applied in each year

Ask a single diagnostic question of each year: was there a P11D? If yes, the benefits on it are additional to the P60 gross pay figure. If no, either there were no benefits, or the benefits were payrolled and are already inside the P60. Getting this wrong produces either omission or double-counting, and both are visible to a reviewer.

The tell for payrolling is a P60 gross figure that exceeds contractual salary plus bonus by an amount that does not correspond to any cash item. Payslips resolve it definitively: payrolled benefits appear as a notional addition to taxable pay with no corresponding net pay effect.

Step 2 — Pull the primary UK documents

• P60 for each UK tax year (6 April to 5 April).
• P11D and P11D(b) for each year, from the employer or the employee's HMRC personal tax account.
• PAYE coding notices — these often itemise benefits by category and value, and survive when P11Ds do not.
• March and April payslips, which bracket the UK year end and allow calendar-year apportionment.
• The employer's PAYE Settlement Agreement position, if any. PSA items are settled by the employer and never appear on the employee's P11D, yet may still be US income.
• Self Assessment returns and SA302 calculations, where the individual filed.

Where the employer has gone, HMRC's own records are the fallback. An individual can obtain historic pay and tax details and coding notices directly, and for older years a subject access request will usually produce more than the personal tax account displays.

Step 3 — Re-measure each benefit under US rules

Take the categories one at a time using the table above. Do not net. Document the basis for each figure — particularly any item you are reducing to nil — because the reconstruction file is the defence file if the return is ever examined.

Step 4 — Convert the UK tax year to the US calendar year

This is the step most preparers skip, and it is the one that produces the most awkward questions. A P11D covers 6 April to 5 April. A Form 1040 covers 1 January to 31 December. A single P11D therefore straddles two US tax years.

For benefits that accrue evenly — medical cover, a car available all year, a stable loan balance — a day-count apportionment across the two calendar years is defensible and easy to document. For event-driven benefits — a relocation package, a one-off award, a loan advanced mid-year — apportion by actual event date. Whichever method you choose, apply it consistently across every year in the filing, because an inconsistent method across a streamlined submission invites exactly the scrutiny you are trying to avoid.

Step 5 — Convert currency correctly

Benefit values are sterling. The IRS accepts a yearly average exchange rate for items accruing evenly through the year and expects the spot rate on the transaction date for discrete events. Use the same source across all years and all items. Mixing a yearly average for salary with a spot rate for a car benefit in the same return is the kind of internal inconsistency that a reviewer notices immediately.

Step 6 — Reconcile UK tax paid to the re-measured income

Because benefits are usually taxed in the UK through a coding adjustment rather than a discrete payment, the UK tax on them is buried inside the PAYE deducted on the P60. Extracting the attributable amount requires rebuilding the UK computation: total taxable income including benefits, tax due, tax on salary alone, difference. That difference is the creditable UK tax on benefits, and it is what supports the Form 1116 position.

Does any of this jeopardise a streamlined filing?

No — provided the reconstruction is done properly and the non-willfulness narrative is honest about it. The IRS Streamlined Filing Compliance Procedures require certification that the failure to report was not willful. "My UK employer reported my medical cover and company car to HMRC, tax was collected through my PAYE code, and I did not understand that a non-cash benefit already taxed in the UK also had to be measured again under US rules" is a coherent, credible and common non-willfulness narrative. It is also, in our experience, one the IRS accepts readily, because it describes a genuine structural difference between two systems rather than a concealment.

What damages a streamlined submission is not the omission. It is a Form 14653 narrative that is vague, a set of returns where the benefit numbers appear without any visible basis, or a filing where benefits are omitted in some years and included in others with no explanation. The certification is a sworn statement; the returns are its evidence. They have to agree.

Two further points specific to this fact pattern. First, benefits in kind rarely move the tax needle much for a UK-based executive, because UK effective rates at these income levels generally exceed US rates and foreign tax credits absorb the additional income. The correction is often close to tax-neutral — which is precisely why it is worth doing properly rather than avoiding. Second, an employer loan account or an employer-linked offshore arrangement can carry its own reporting obligations, and unreported foreign accounts are what actually drive penalty exposure. Our IRS streamlined filing practice handles both halves of that in one engagement.

What is changing between 2026 and 2028, and why does it matter for US filers?

The UK is moving from P11D reporting to mandatory payrolling of benefits in kind, on a phased basis. HMRC has already closed new voluntary payrolling registrations, and mandatory payrolling is being introduced in stages — a first tranche covering cars, car fuel, vans, van fuel and medical benefits, followed by most remaining benefits. Employment-related loans and living accommodation are excluded and will continue to be reported on a P11D. HMRC's guidance on payrolling benefits through payroll and the detailed valuation rules in booklet 480 are the primary sources.

For US filers the implication is significant and under-appreciated: the P11D is disappearing as an audit trail. Once benefits are payrolled, there is no annual statement listing them by category and value. The only record is inside payroll data — a notional taxable pay addition on a payslip, and an inflated P60 gross figure. Anyone reconstructing years from 2027 onwards will need payslips or employer payroll reports, not a single summary document.

The practical instruction for clients is simple and worth acting on now: request and retain a full benefits statement from your employer for every year, whether or not a P11D is issued, and keep March and April payslips permanently. For clients we advise on high net worth engagements we build this into the annual document request precisely because the UK-side record is becoming thinner just as the US-side reconstruction burden stays the same.

Worked illustration

A US citizen serving as a UK-based divisional director receives base salary, an annual bonus, family private medical cover, a company car with fuel, and an interest-free relocation bridging loan of £120,000 outstanding for two years. She has not filed US returns for four years.

The naive reconstruction adds the P11D total to salary each year and files. The correct reconstruction does the following:

• Removes the medical premium from US income under the §106 analysis, documents the basis, and reallocates the associated UK tax before claiming credit.
• Recomputes the car benefit on a personal-use basis under the fringe benefit regulations rather than on the CO2-linked UK cash equivalent, supported by mileage records where they exist.
• Recomputes the loan benefit under §7872 at the applicable federal rate rather than at HMRC's official rate.
• Apportions each UK tax year figure across two US calendar years on a documented day-count basis.
• Rebuilds the UK computation each year to isolate the PAYE attributable to benefits for Form 1116.
• Checks whether the loan facility, and any employer-linked account through which it ran, triggers FBAR or Form 8938 reporting.

The tax outcome across the four years is frequently modest. The difference in defensibility is not.

The mistakes we see most often

• Double-counting payrolled benefits. Adding a P11D total to a P60 gross figure that already includes payrolled items.
• Adopting the HMRC cash equivalent wholesale. Precise-looking, and wrong for cars, loans and medical cover.
• Ignoring the tax year mismatch. Treating a 6 April to 5 April P11D as if it were a calendar year figure.
• Claiming UK tax on benefits without isolating it. Form 1116 positions that cannot be traced back to a UK computation.
• Deducting UK-deductible employee expenses. Unreimbursed employee expenses are not deductible for US federal purposes even where HMRC allows relief.
• Forgetting PSA items. Benefits settled by the employer under a PAYE Settlement Agreement never reach the employee's P11D but may still be US income.
• Assuming symmetry. The most expensive assumption in cross-border compliance: that because HMRC taxed it, the IRS must, or that because HMRC exempted it, the IRS will.

If you want the surrounding US and UK compliance picture, our UK tax services overview and the wider guides library cover the adjacent issues — pensions, ISAs, share schemes and the reporting obligations that travel with them.

Speak to us in confidence

If you have UK benefits in kind sitting on P11Ds or inside payrolled pay for years where no US return was filed, the position is almost certainly correctable — quietly, on a documented basis, and usually with far less tax at stake than clients fear. We handle the reconstruction, the year-by-year re-measurement, the currency and apportionment work, and the streamlined submission as one engagement, so the numbers on the returns and the narrative on the certification say the same thing. Contact our cross-border team for a confidential, privileged conversation about your circumstances.