UK Rental Depreciation: Why the IRS Treats Your London Flat Differently
UK rental depreciation is the deduction most American property owners in Britain either claim incorrectly or never claim at all, and both mistakes cost the same amount on the day you sell. HMRC gives no relief for the wear and tear on a residential building. The IRS insists on it. Consequently, your American and British rental accounts will never agree, and the gap between them decides your tax bill.
Two facts drive every UK rental depreciation computation. First, depreciation on foreign property is compulsory rather than optional. Secondly, the IRS reduces your cost basis by the depreciation you were entitled to claim, whether or not you actually claimed it. Therefore, skipping the deduction does not simplify your position. Instead, it guarantees you pay tax on a benefit you never received.
At TaxYork we prepare returns for Americans holding London flats, regional portfolios and family homes let out after a move. Furthermore, we regularly inherit files where a decade of UK rental depreciation was omitted, and the fix is more generous than most owners expect.
Most published guidance on this subject is written for American landlords generally, not for owners of British property specifically. Consequently, it misses the British half of the problem entirely, including the finance cost restriction, the absence of capital allowances on dwellings and the rate rise arriving in April 2027. This guide covers both sides.
What UK Rental Depreciation Actually Means
UK rental depreciation for American tax purposes means writing off the cost of the building, though never the land, in equal annual instalments across a fixed recovery period. The deduction appears on Schedule E alongside your rent and expenses, and it reduces your American taxable profit without costing you a penny of cash.
British tax law offers nothing comparable for residential lettings. HMRC's Property Income Manual confirms that capital allowances cannot be claimed on plant and machinery within a dwelling house, and no allowance exists for the structure itself. Instead, landlords receive replacement of domestic items relief, which covers replacing furnishings rather than the building.
The consequence is structural. Your British taxable profit will normally exceed your American taxable profit on the same property, year after year. Therefore, understanding UK rental depreciation is less about the deduction itself and more about managing the mismatch it creates between two tax systems.
Why the Deduction Is Not Optional
Owners often assume depreciation is a choice, particularly when their property already runs at a loss for American purposes. That assumption is wrong, and it is the single most expensive misunderstanding in this area.
The rule is known as "allowed or allowable". When you sell, the IRS reduces your basis by the depreciation you could have claimed, regardless of whether you took the deduction. Consequently, an owner who skipped ten years of UK rental depreciation still faces recapture on ten years of it, having received no deduction whatsoever in exchange.
There is a further trap in the mechanics. Using an impermissible method for two consecutive years formally adopts that method, so simply starting to claim correctly in a later year does not repair the earlier ones. Instead, a formal accounting method change is required, which we cover below.
The Recovery Period: 30 Years or 40 Years
Foreign property cannot use the accelerated system available domestically. Under Section 168(g), tangible property used predominantly outside the United States must be depreciated under the Alternative Depreciation System, using the straight-line method and a mid-month convention.
Your UK rental depreciation recovery period then depends on a single date, and getting it wrong distorts every year of the schedule.
The 30-Year Rule for Property Placed in Service After 2017
For residential rental property placed in service after 31 December 2017, the ADS recovery period is 30 years. The Tax Cuts and Jobs Act shortened it from 40, and the change applies to foreign property just as it does to domestic property under ADS.
That distinction matters commercially. A 30-year period produces an annual deduction one third larger than a 40-year period on identical facts. Consequently, an owner still applying the older figure understates UK rental depreciation by a meaningful margin every single year.
We see the error constantly, and usually it originates in software defaults or in older published guidance. Furthermore, several articles currently ranking for this topic still quote 40 years without qualification. Therefore, check the placed-in-service date on your own schedule before assuming your preparer used the right figure.
When 40 Years Still Applies
The 40-year period survives for residential rental property placed in service before 1 January 2018. Consequently, a London flat first let in 2015 continues on the longer schedule, and you cannot simply switch it to 30 years because the law changed afterwards.
Non-residential foreign property also uses 40 years. Therefore, a commercial unit, an office or a mixed-use building let entirely to business tenants follows the longer period regardless of when you acquired it.
"Placed in service" means available and ready for its intended use rather than the date of purchase. Accordingly, a property bought in November 2017 but first advertised for letting in March 2018 falls into the 30-year camp. That single distinction has adjusted UK rental depreciation schedules for several of our clients by tens of thousands of dollars across the life of the asset.
Land Is Never Depreciable
Only the building generates UK rental depreciation. Consequently, you must split the purchase price between land and structure, and British conveyancing documents almost never make that split for you.
Reasonable allocation methods include a professional valuation, an insurer's rebuild cost assessment, or a defensible ratio supported by local evidence. Meanwhile, an unsupported round number invites challenge. In our experience, London flats commonly sit between 20 and 30 per cent land, though the correct figure always depends on the property.
Document the basis once and apply it consistently. Furthermore, keep the supporting evidence permanently, because the allocation you choose today determines your UK rental depreciation for three decades and your recapture calculation on sale.
Currency: Your Basis Is Fixed in Dollars
Here is a UK rental depreciation mechanic that catches almost every owner. Your depreciable basis is fixed in US dollars at the exchange rate applying when you acquired the property. It never moves again, whatever sterling does afterwards.
The Acquisition Rate Locks Forever
Convert the purchase price, the acquisition costs and the land allocation into dollars once, using the rate on the acquisition date. Consequently, a flat bought at $1.60 to the pound carries a far larger dollar basis than an identical flat bought at $1.22, even though both cost the same in sterling.
That locked rate creates winners and losers. An owner who bought before the 2016 referendum enjoys an inflated dollar basis and correspondingly generous UK rental depreciation. Meanwhile, a recent buyer receives a smaller deduction on the same building.
Rental income and expenses follow different rules. The IRS accepts the annual average rate for recurring items, so your income converts at one rate while your basis remains frozen at another. Therefore, keep the two conversions clearly separated in your workpapers.
Reporting the Income Itself
Your UK rental depreciation claim sits on Schedule E, and foreign rental income belongs there in the same way as domestic rental income. Consequently, you report gross rent, then deduct letting agent fees, repairs, insurance, ground rent, service charges, mortgage interest and depreciation.
American rules on mortgage interest are considerably more generous than British ones, which we address next. Additionally, the passive activity rules may suspend any resulting loss, a point we cover in our guide to passive activity loss rules and UK rentals.
Wider reporting duties sit alongside the income. FinCEN requires an FBAR where your aggregate foreign accounts exceed $10,000 at any point in the year, which frequently includes the account collecting your rent. Our FBAR and FATCA service handles those filings.
Where the British and American Numbers Diverge
The UK rental depreciation mismatch is not merely academic. It determines how much foreign tax credit you can actually use, and it frequently strands British tax you have already paid.
The Finance Cost Restriction
Britain no longer allows residential landlords to deduct mortgage interest from rental profits, which compounds the UK rental depreciation divergence. Instead, HMRC's rules give a tax reducer worth 20 per cent of the finance costs, which for an additional-rate taxpayer represents relief at less than half the rate applying to the income.
America imposes no such restriction. Consequently, your Schedule E deducts the full interest at your marginal rate, while your Self Assessment return adds it back and hands you a basic-rate credit instead.
Stack that difference on top of UK rental depreciation and the divergence becomes dramatic. A property showing a healthy British profit can simultaneously show an American loss, which is exactly the pattern in our case study below.
The 2027 Property Rate Rise
British rates on property income are rising, which widens the UK rental depreciation gap further. From 6 April 2027, the property basic rate becomes 22 per cent, the higher rate 42 per cent and the additional rate 47 per cent, each two points above the equivalent earnings rate.
The change widens the gap rather than narrowing it. Consequently, British tax on the same rental profit rises while the American position, driven by depreciation and full interest relief, remains unchanged. Therefore, owners who already generate excess foreign tax credits will generate more of them from 2027.
Non-resident owners face a related consequence. The withholding rate under the Non-Resident Landlord Scheme follows the property basic rate, so it rises to 22 per cent at the same time. We explain the registration route that stops the deduction entirely in our guide to the Non-Resident Landlord Scheme.
Credits That Have Nowhere to Go
Foreign tax credits arising alongside UK rental depreciation are computed by category, and rental income normally falls into the passive basket. Consequently, British tax on rental profits can only be credited against American tax on passive income, not against tax on your salary.
That restriction bites precisely when UK rental depreciation works well. Where depreciation and interest turn a British profit into an American loss, there is no American tax in the passive basket to credit against, so the British tax becomes an excess credit instead of a saving.
Those credits are not wasted, provided you use them. They carry back one year and forward ten on Form 1116, which our tax treaty optimisation service models across the whole holding period rather than one return at a time.
Improvements, Repairs and Furnishings
The building is rarely the only depreciable asset, and the boundary between a repair and an improvement decides whether you deduct a cost immediately or spread it across decades. Consequently, this distinction affects your UK rental depreciation schedule more often than the building itself.
Repairs Versus Improvements
For UK rental depreciation purposes, a repair restores the property to its previous condition and is deducted in full in the year you incur it. An improvement betters the asset, adapts it to a new use or restores it after substantial deterioration, and it must be capitalised and depreciated instead.
Replacing a broken boiler with an equivalent model reads as a repair. Meanwhile, gutting a kitchen, adding a bathroom or converting a loft plainly improves the property. Therefore, each improvement starts its own UK rental depreciation schedule from its own placed-in-service date, running for its own full recovery period.
IRS Publication 527 sets out the framework in detail, and the same principles apply to foreign property under ADS. Additionally, British treatment diverges again here, since HMRC allows revenue repairs against rental profit but denies relief for capital improvements until disposal.
Furnishings and Fixtures
Furniture, white goods, carpets and similar items are separate assets with shorter lives, and they are depreciated separately from the structure. Consequently, a furnished London letting generates several parallel schedules rather than one.
Bonus depreciation and expensing under Section 179 are unavailable for property required to use ADS. Therefore, an American owner cannot accelerate these costs the way a domestic landlord might, and the deductions must be spread across the applicable recovery periods.
Britain approaches the same expenditure from a different direction entirely. Capital allowances are denied within a dwelling house, so relief comes only through replacement of domestic items relief, and only on replacements rather than the original purchase. Consequently, your first fit-out generates UK rental depreciation in America and nothing at all in Britain.
Keep the Evidence Permanently
Every figure in a depreciation schedule must be defensible thirty years after the event. Accordingly, we ask clients to retain completion statements, valuations, invoices for improvements and the exchange rate evidence supporting the dollar basis.
The credit position depends on the same records. Where British tax exceeds American tax on the property, the Treasury's treaty library holds the agreement under which relief is claimed, while MoneyHelper's guidance for landlords gives useful background on the British side of ownership.
Poor records cost real money. Furthermore, a missing valuation frequently forces a conservative land allocation, which permanently reduces UK rental depreciation across the entire holding period.
Recapture: The Bill That Arrives on Sale
UK rental depreciation is a deferral, not a gift. When you sell, the IRS reclaims the benefit, and the rate is higher than the long-term capital gains rate most owners expect.
Unrecaptured Section 1250 Gain at 25 Per Cent
Gain attributable to depreciation on real property is taxed as unrecaptured Section 1250 gain, at a maximum federal rate of 25 per cent rather than the 15 or 20 per cent applying to the rest of the gain. Consequently, a long holding period converts a substantial slice of your profit into higher-rate income.
The arithmetic is straightforward and unwelcome. Thirty years of UK rental depreciation on a $900,000 building eventually exposes the entire building cost to the 25 per cent rate. Additionally, the 3.8 per cent Net Investment Income Tax may apply on top.
Britain taxes the same disposal under its own rules, with no depreciation to recapture and its own reliefs to apply. Therefore, the two gain computations rarely match, and we cover the non-resident position in our guide to non-resident capital gains on UK property.
Recapture Applies Even If You Never Claimed
This is where the "allowed or allowable" rule becomes expensive. An owner who never claimed UK rental depreciation still reduces basis by the amount that was allowable, so the recapture arrives exactly as if the deduction had been taken.
Consider the asymmetry. You received no annual deduction, yet you pay 25 per cent on the depreciation you never claimed. Consequently, the decision to "keep it simple" by omitting depreciation is among the most costly simplifications available to an American property owner.
The position is repairable, and the repair is generous. Therefore, no owner in this situation should assume the earlier years are lost.
Fixing Years You Never Claimed
Missed UK rental depreciation is corrected through an accounting method change rather than a stack of amended returns. That distinction is the practical heart of this article, and the leading competing guides omit it entirely.
Form 3115 and the Section 481(a) Adjustment
An impermissible method adopted over two or more consecutive years is changed by filing Form 3115, Application for Change in Accounting Method, with your current return. The instructions to Form 3115 set out the automatic change procedures.
The mechanism then delivers the catch-up in a single year. A Section 481(a) adjustment computes the cumulative difference between the depreciation you should have claimed and the depreciation you actually claimed, and a negative adjustment produces a one-off deduction in the year of change.
That treatment is far better than amending. Consequently, a decade of missed UK rental depreciation can be recovered in the current year without reopening a single earlier return, and without being limited by the ordinary three-year refund window.
When Amending Is Still the Right Route
An accounting method change is not always the right fix for UK rental depreciation errors. Where the error affected only one year, or where you simply used the wrong recovery period once, amendment on Form 1040-X remains appropriate.
Foreign tax credit claims enjoy a longer window in any event. Refund claims attributable to foreign taxes run for ten years rather than three, so credits missed alongside the depreciation may still be recoverable even where the depreciation itself is corrected prospectively.
Where returns are missing altogether rather than merely wrong, the IRS Streamlined Filing Compliance Procedures provide the route back. Our IRS Streamlined Filing service prepares those submissions, and our US and UK tax returns preparation work reconciles both countries from a single workpaper.
Case Study: A London Flat Bought in 2019
Consider a client we shall call the London flat owner, a US citizen resident in Britain who bought a two-bedroom flat in March 2019 for £850,000 and let it from the following month. A professional valuation supported a 25 per cent land allocation, leaving a building cost of £637,500.
The dollar basis locked at acquisition. At the rate then applying of $1.32 to the pound, the building basis became $841,500. Because the property was placed in service after 2017, the 30-year ADS period applied, producing annual UK rental depreciation of approximately $28,050 on a straight-line basis.
The British computation looked profitable. Rent of £42,000 less running costs of £9,000 produced a taxable profit of £33,000, since mortgage interest of £14,000 is not deductible. Tax at the additional rate of 45 per cent came to £14,850, reduced by the basic-rate finance credit of £2,800, leaving £12,050 payable, or roughly $15,304.
The American computation told the opposite story. Schedule E showed rent of $53,340, running costs of $11,430, mortgage interest of $17,780 deducted in full, and depreciation of $28,050. Consequently, the property produced an American loss of about $3,920 rather than a profit.
The mismatch created the problem. With no American tax on passive income, the entire $15,304 of British tax became an excess credit in the passive basket rather than a saving. Therefore, the client paid British tax at 45 per cent while banking credits that only future passive income could absorb.
The sale exposed the second issue. Assuming a disposal in 2030 after eleven years, cumulative UK rental depreciation of roughly $308,550 becomes unrecaptured Section 1250 gain, taxed at up to 25 per cent, which is about $77,138 of federal tax. Suspended passive losses released on disposal offset part of that charge, though not all of it.
One further point transformed the engagement. The client had claimed no depreciation at all for the first six years, on a previous preparer's advice that it was optional. Nevertheless, the recapture would have applied regardless, so those six years represented pure loss.
We filed Form 3115 with the current return. A Section 481(a) adjustment of approximately $168,300 produced a single-year catch-up deduction, recovering six years of missed UK rental depreciation without amending any earlier return. Consequently, a position the client believed was closed generated a substantial deduction in the year of change.
How TaxYork Can Help
We prepare American and British property computations together, because UK rental depreciation only makes sense when both are visible at once, from one reconciled workpaper, because the two will never agree and the difference is where the planning sits. Our UK rental depreciation work begins with the completion statement and the valuation evidence rather than the annual rent statement.
The engagement then covers the full UK rental depreciation life of the asset. Specifically, we fix the land and building split, lock the dollar basis at the correct historic rate, confirm the placed-in-service date and recovery period, model the credit position across the passive basket, and project the recapture exposure on an eventual sale.
For owners who never claimed the deduction we prepare the accounting method change and the catch-up computation. Furthermore, we review open years for unclaimed foreign tax credits alongside it. Explore our full range of US personal tax services to see how the pieces connect, or read our companion guide to UK rental property US reporting.
Conclusion
UK rental depreciation is compulsory, mechanical and consequential. The recovery period is 30 years for property placed in service after 2017 and 40 years for earlier acquisitions, the land never depreciates, and the dollar basis freezes at the acquisition-date exchange rate.
The British system offers no equivalent relief and restricts mortgage interest to a basic-rate credit, so your two computations will diverge permanently. Consequently, British tax frequently exceeds American tax on the same property, generating excess credits in the passive basket that only careful planning converts into value. From April 2027 the divergence widens as British property rates rise to 22, 42 and 47 per cent.
Above all, remember that recapture applies whether or not you claimed the deduction. Therefore, an owner who has never claimed should file an accounting method change rather than accepting the loss, because a single Section 481(a) adjustment can recover years of missed UK rental depreciation in one return.
Contact Us
If you own British property and have never been certain your UK rental depreciation schedule is right, we can review it and quantify what is recoverable. Speak to our team on 020 3488 8606 or email hello@taxyork.com. Alternatively, book a consultation and we will assess your UK rental depreciation position across both countries.
Disclaimer
This article provides general information about UK rental depreciation for US tax purposes and does not constitute tax advice for any particular person. Legislation, rates and thresholds change, and the treatment of any property depends on your individual circumstances, its placed-in-service date and your residence position. You should obtain professional advice before acting. TaxYork accepts no liability for any action taken in reliance on this article.
Written by the TaxYork Expert Team — US-UK tax specialists.