Introduction: UK Employment Expenses and the 2026/27 Reset
UK employment expenses now sit at the centre of an awkward cross-border problem. Moreover, the rules changed materially on 6 April 2026. Americans on a London payroll spend real money on professional subscriptions, business travel and equipment. Furthermore, they often assume that recovering some of it from HMRC is straightforward and costless. Neither assumption survives contact with a dual filing position. TaxYork sees the same pattern every season. A client claims relief in Britain and receives a modest repayment. Subsequently, the Internal Revenue Service quietly takes part of it back. Our cross-border tax planning for Americans in Britain work begins with exactly this arithmetic.
Why UK Employment Expenses Matter Twice for an American
A claim for UK employment expenses reduces your British tax bill. However, your British tax bill is the raw material for your American foreign tax credit. Therefore, every pound of relief you win from HMRC is a pound of foreign tax you never paid. Equally, it is a pound of credit you can no longer claim. The saving is real only when your credits already exceed your US tax. Otherwise, the claim simply hands the money to a different treasury.
The Three Rules That Changed on 6 April 2026
Three changes landed together at the start of the 2026/27 tax year. Firstly, the approved mileage rate for cars rose from 45p to 55p on the first 10,000 business miles. That was the first increase in fifteen years. Secondly, the flat-rate deduction for working from home disappeared entirely. Thirdly, the evidence regime introduced in October 2024 has now bedded in. Accordingly, HMRC rejects unsupported claims as a matter of routine. Consequently, guidance on UK employment expenses written before April 2026 is actively misleading.
What Counts as an Allowable Expense Under Section 336
The statutory test is narrow, and most people misjudge it. Section 336 of the Income Tax (Earnings and Pensions) Act 2003 imposes two conditions. You must be obliged to incur the cost as a holder of the employment. Additionally, the amount must be incurred wholly, exclusively and necessarily in the performance of your duties. Read the legislation itself at section 336 ITEPA 2003. HMRC sets out its own reading in the Employment Income Manual at EIM31620.
The Wholly, Exclusively and Necessarily Test
Each of those three words does independent work. "Necessarily" is objective, so it is not enough that your employer expects the expense or that you consider it sensible. Additionally, "in the performance of the duties" excludes anything that merely puts you in a position to do the job. Hence ordinary commuting and most training costs fail. HMRC expands on the point at EIM31650 on the duties test. Notably, the test is harsher than the equivalent rule for the self-employed. It is harsher still than most American employees expect.
Professional Fees and Subscriptions
Professional fees and subscriptions are the most reliable category of UK employment expenses for a senior American in Britain. Relief is available where the body appears on HMRC's approved list. Furthermore, the membership must be relevant to the duties you actually perform. The GOV.UK guidance on professional fees and subscriptions sets out the position. For instance, a US-qualified accountant paying an American institute subscription can often claim. AICPA membership is a common example. The body must be approved and the membership must support the UK role.
Uniforms, Tools and Flat Rate Expenses
Among UK employment expenses, flat rate claims cover uniform maintenance, specialist clothing and tools. Where no industry-specific figure applies, the standard amount is £60 a year. Furthermore, HMRC publishes fixed figures by occupation. Pilots and flight deck crew get £1,022 and cabin crew £720. Meanwhile, ambulance staff on active service get £185 and nurses £125. The full flat rate table sits on GOV.UK. Importantly, flat rate claims need no receipts. They are the only low-friction category left.
The £2,500 Threshold and How You Claim UK Employment Expenses
The £2,500 figure is a routing rule rather than a cap. Where your total claim comes to £2,500 or less, you may use form P87 or the online service. Where it exceeds £2,500, you must file a Self Assessment return instead. HMRC states the rule plainly in its guidance on claiming job expenses by post. Therefore, a single large claim can drag an American who has never filed a UK return into the Self Assessment system.
Claiming Below £2,500 by Post or Online
Since 31 October 2024, uniform, work clothing and tool claims can be made online. Other categories generally travel by post on form P87, together with supporting evidence. The HMRC P87 guidance explains both routes. Relief usually arrives as a change to your PAYE code for the current year, or as a repayment for earlier years. Meanwhile, processing times of eight to ten weeks remain common. MoneyHelper explains how PAYE deductions appear on your payslip, which is where a coding change shows up.
Above £2,500 the Self Assessment Return Becomes Compulsory
Once your UK employment expenses exceed £2,500 in a tax year, the P87 route closes. You must register for Self Assessment and claim through the return, as the GOV.UK guidance on who must send a return confirms. Consequently, the compliance cost rises sharply. Many Americans already file a US return, an FBAR and often Form 8938. Adding a UK return for a few hundred pounds of relief therefore deserves a hard commercial look.
The Four-Year Window and the Evidence Regime
You have four years from the end of the tax year to claim UK employment expenses. The Chartered Institute of Taxation has repeatedly pressed HMRC on the workability of the regime. However, HMRC tightened the evidence rules on 14 October 2024 after finding widespread ineligible claims. The department published a briefing explaining what it now demands. ICAEW summarised the practical effect for advisers, and ICAS covered the same shift. Receipts, invoices and detailed mileage logs are now the price of entry.
Mileage and the 55p Rate That Changed Everything
Business mileage is the largest category of UK employment expenses for most mobile executives. Additionally, the 2026/27 rate change is substantial. From 6 April 2026, the approved payment for cars and vans rose to 55p. That rate covers the first 10,000 business miles in the tax year. The 25p rate above 10,000 miles stayed put. The Government published the measure on GOV.UK, and ICAEW noted it was the first increase in fifteen years.
How the Approved Rates Work in 2026/27
Cars and goods vehicles attract 55p and then 25p a mile. Motorcycles attract 24p and bicycles 20p. GOV.UK sets out the vehicle rules in full. Furthermore, the rates cover fuel, insurance, servicing and depreciation together, so you cannot claim those costs separately. Business mileage excludes ordinary commuting. Additionally, HMRC expects a log recording each journey reason with start and finish postcodes.
When Your Employer Pays Less Than the Approved Rate
Mileage allowance relief bridges the gap. Where your employer reimburses below the approved rate, you claim tax relief on the shortfall. For example, an employer paying 25p a mile leaves 30p of relief available in 2026/27. Only 20p was available a year earlier. Consequently, the rate rise silently increased the value of thousands of existing arrangements. Additionally, employers who never revisited their policy are now underpaying against a materially higher benchmark.
Working From Home Relief Ended on 6 April 2026
The homeworking flat rate is gone. HMRC now states that you cannot claim tax relief for working from home in 2026/27. However, you can still claim for the four previous tax years. The old £6 a week deduction produced £1.20 a week at the basic rate. Higher rate payers received more. Therefore, the abolition removes a small but widely used component of UK employment expenses.
What You Can Still Recover for Earlier Years
The four-year window remains open for 2022/23 onwards. Americans who worked from a London flat through the hybrid years can still claim those periods. The original conditions still apply. However, the conditions were always stricter than popular guidance suggested. Relief required that the job objectively obliged you to work from home. Voluntary homeworking never qualified, and HMRC now asks for the employment contract or equivalent proof.
The Homeworking Reimbursement Route That Survives
Employers may still reimburse reasonable additional household costs free of UK tax. HMRC explains the separate homeworking rules at EIM32712. That route survives the abolition of the employee deduction. Moreover, it is dramatically better for an American, for reasons the next section makes clear. Reimbursement removes the cost without touching your foreign tax credit at all.
The US Side: Why the IRS Now Gives You Nothing
Here is the fact that almost every British guide omits. Your UK employment expenses are not deductible on your US return, and that position is now permanent. The Tax Cuts and Jobs Act suspended miscellaneous itemised deductions subject to the 2% floor from 2018. Subsequently, the One Big Beautiful Bill Act made that repeal permanent for tax years beginning after 31 December 2025. The IRS explains the current treatment in Publication 529.
Unreimbursed Employee Expenses Are Permanently Disallowed
Unreimbursed employee business expenses, investment expenses and tax determination costs all fall inside the repealed category. Consequently, an American paying £1,400 of London professional subscriptions gets a British deduction and no American one. Additionally, the standard deduction now absorbs most itemising in any event. The IRS overview for citizens and residents abroad sets the wider filing context. Meanwhile, the IRS summary of the new law covers the deductions that survived.
The Narrow Educator Exception
One exception exists. The 2025 legislation created a new deduction for eligible educator expenses. It sits outside the 2% floor and applies to costs incurred after 31 December 2025. Therefore, an American teaching at a British school occupies unusually favourable ground compared with a banker or a lawyer. Otherwise, the general rule holds without qualification, and the asymmetry between the two systems is total.
Reimbursement Beats Relief Every Time
The practical conclusion follows directly. An employer reimbursement under an accountable arrangement is tax-free in Britain and generates no US income at all. In contrast, a personal claim for UK employment expenses produces a British deduction and no American one. Worse, it produces a smaller foreign tax credit. Consequently, negotiating reimbursement is worth far more than perfecting a P87. We raise this in almost every engagement involving US tax return preparation for expats.
How a UK Claim Shrinks Your Foreign Tax Credit
The mechanism behind the claim and the credit is simple once you see it. Form 1116 credits the foreign income tax you actually paid or accrued. A limitation based on your foreign source income then applies. The IRS foreign tax credit guidance and Publication 514 set out the mechanics. Meanwhile, the instructions to Form 1116 handle the computation. Claiming UK employment expenses reduces the UK tax you paid. Therefore, it reduces the numerator of your credit.
The Dollar-for-Dollar Clawback
Consider a client whose credits exactly match their US liability. A £1,467 reduction in UK tax removes roughly the same value of credit. Consequently, the US liability rises by an equivalent amount. The net benefit of the British claim is therefore nil. All that effort produces a transfer between two revenue authorities. Moreover, the client has now filed a Self Assessment return they did not previously need.
When the Claim Is Still Genuinely Worth Making
Most senior Americans in Britain sit in an excess credit position. The 45% additional rate simply exceeds the 37% top US federal rate. Where that holds, a smaller foreign tax credit simply reduces an unused carryforward, and the British saving is entirely real. The IRS explains carryback and carryforward at Topic 856. Excess credits carry back one year and forward ten. Therefore, the question is not whether you can claim. Instead, ask whether your carryforward can absorb the loss.
The Foreign Earned Income Exclusion Complication
Anyone relying on the exclusion faces a further wrinkle. The IRS foreign earned income exclusion guidance and Form 2555 exclude income rather than tax. However, foreign taxes allocable to excluded income generate no credit at all. Consequently, an exclusion claimant loses the UK tax without gaining anything, and the interaction deserves modelling before you file. Our foreign tax credit and treaty optimisation work exists precisely for this decision.
Case Study: A £3,260 Claim and What It Actually Delivered
One client runs the London desk of an American asset manager on a salary of £180,000. They pay £1,400 a year in approved professional subscriptions. Additionally, they drive 6,200 business miles, reimbursed at 25p a mile. At the 2026/27 rate of 55p, mileage allowance relief covers the 30p shortfall. That adds a further £1,860 of UK employment expenses. Their total claim comes to £3,260.
The British Outcome
Because £3,260 exceeds the £2,500 threshold, the P87 route was unavailable and they registered for Self Assessment. At the 45% additional rate, the claim saved £1,467 of UK income tax. Additionally, the mileage element alone was £620 larger than it would have been under the old 45p rate. The gross British benefit therefore looked attractive on paper.
The American Outcome
Their UK tax fell by £1,467, or roughly $1,940 at current rates. Therefore, their creditable foreign tax fell by the same amount. Fortunately, they carried forward $214,000 of unused general basket credits. The reduction merely trimmed a carryforward they will never use. Consequently, the £1,467 stayed in their pocket. Had they instead been an exclusion claimant with matched credits, the identical claim would have delivered nothing whatsoever.
How TaxYork Can Help
We prepare both returns, which means we can model the decision rather than guess at it. Our team quantifies the British relief on your UK employment expenses. We then test your foreign tax credit position across the carryforward window. Finally, we tell you whether the claim justifies the filing obligation it creates. Furthermore, we handle the Self Assessment registration where the £2,500 threshold forces it. We also coordinate the claim with your FBAR and FATCA reporting. Additionally, we cover related payroll questions such as non-resident directors and the 2026 NICs easement. The same credit arithmetic drives PAYE Settlement Agreements too.
Conclusion
UK employment expenses deserve a cross-border answer rather than a British one. The 55p mileage rate increased what many executives can recover. Meanwhile, the abolition of homeworking relief removed a familiar deduction. Meanwhile, the American position hardened permanently in 2026, so the IRS now offers no matching deduction at all. Therefore, the value of any claim depends almost entirely on your foreign tax credit position. Model your UK employment expenses first, claim second, and pursue employer reimbursement wherever possible. Above all, never assume that a British repayment is money you get to keep.
Contact Us
Speak to a team that prepares both returns and understands how UK employment expenses move between them. To review your position before you file, book a consultation with our specialists, or contact us directly. Reach us at hello@taxyork.com or on 020 3488 8606. Additionally, you can explore our full range of US personal tax services online.
Disclaimer
This article provides general information about UK employment expenses and United States tax rules as at September 2026. It does not constitute tax advice and should not be relied upon in isolation. Tax legislation changes frequently, and the correct treatment depends entirely on your individual circumstances, residence position and filing history. You should obtain professional advice tailored to your facts before acting. TaxYork accepts no liability for any action taken or not taken in reliance on this article.