US Tax Return Preparation for Expats: UK Rental Losses
US tax return preparation for expats with a London rental: why the loss is passive, where suspended losses go across restated years, and when they release.
Losses that wait for the sale
When a US owner of a London rental finally restates several unfiled years, the corrected returns usually produce a loss rather than a refund. That loss is almost always passive. It cannot be set against salary, bonus, carried interest or portfolio income. It is suspended, carried forward indefinitely, and released in full only when the property is sold.
This is the single most misunderstood outcome in US tax return preparation for expats who own UK residential property. At Jungle Tax we see the same conversation every quarter: a client discovers that mortgage interest and thirty years of unclaimed depreciation turn what they assumed was a taxable rental into a substantial loss, and they expect that loss to wipe out US tax on their City salary. It does not. Understanding why — and where the loss actually goes — changes how the whole catch-up filing is designed.
Why is a UK rental loss passive rather than deductible?
Section 469 of the Internal Revenue Code divides income into three buckets: active (wages and self-employment), portfolio (interest, dividends, capital gains) and passive. Losses from a passive activity can only offset income from a passive activity. Everything else waits.
Crucially, rental real estate is treated as per se passive. IRS Publication 925, Passive Activity and At-Risk Rules, is explicit that a rental activity is passive even where the owner materially participated, unless that owner qualifies as a real estate professional. It does not matter that you personally vet tenants, negotiate the lease, chase the managing agent about the lift, or fly back from New York to deal with a Section 20 major works notice. The activity is passive by statutory definition.
Publication 925 contains no special carve-out for foreign property. A flat in Kensington is subject to precisely the same passive activity regime as a duplex in Brooklyn. What differs is everything around the loss — the depreciation life, the currency, the foreign tax credit basket, and the fact that HMRC is simultaneously computing a completely different number for the same building.
Does the $25,000 active participation allowance help our clients?
Almost never. Section 469(i) allows an individual who actively participates in rental real estate — a lower bar than material participation, met by making management decisions such as approving tenants and setting rents — to deduct up to $25,000 of otherwise passive rental losses against non-passive income.
The allowance is then reduced by 50% of the amount by which modified adjusted gross income exceeds $100,000, and is fully extinguished once modified AGI reaches $150,000. For a married couple filing separately who lived apart all year the ceiling is $12,500 with the phase-out starting at $50,000; a couple filing separately who lived together at any point during the year cannot use the allowance at all.
Two points matter enormously for cross-border clients and are routinely missed by generalist preparers:
- The income test is a hard cliff at the level our clients occupy. A founder, fund principal or senior executive is past $150,000 of modified AGI before the conversation begins. The allowance is not reduced — it is gone.
- The modified AGI used for this test is computed without the benefit of the foreign earned income exclusion. Expats who assume that excluding their UK salary under section 911 drops them below the threshold are working from the wrong number: the excluded earnings are added back for the purpose of the phase-out. A taxpayer with a modest post-exclusion AGI can still be comfortably over $150,000 for section 469(i).
The practical consequence: in a genuine high-net-worth catch-up filing, the special allowance can be assumed unavailable, and the entire loss suspends. Plan the engagement on that basis and no one is disappointed at signature.
What about the real estate professional exception?
The real estate professional route in Publication 925 requires two tests to be met in the same year: more than half of all personal services performed in all trades or businesses must be in real property trades or businesses, and more than 750 hours of service must be performed in those real property trades or businesses with material participation. A full-time investment banker, lawyer, consultant or founder fails the first test on the day they sign their employment contract, regardless of how many hours the property consumes. It is not a realistic route for our client base and should not be presented as one.
Where do suspended losses actually go across several restated years?
This is the question that matters when the return is not one year but five. Suspended passive losses are not lost, forfeited or time-barred. They are carried forward indefinitely, year on year, and are tracked in the worksheets attached to Form 8582, Passive Activity Loss Limitations. Each year's disallowed loss becomes the next year's "prior year unallowed loss" and stacks on top of the new one.
When several years are prepared and filed simultaneously — the normal position in a compliance catch-up — three mechanical consequences follow:
- The years must be built in sequence, not in parallel. Year one's Form 8582 produces the carryforward that year two consumes. Preparing them independently and reconciling afterwards is how carryforward balances get corrupted, and a corrupted balance follows the client for as long as they own the property.
- Passive income in a later year absorbs earlier losses automatically. If the flat moves from loss to profit in year four, that profit is passive income and is soaked up by the accumulated suspended loss before any US tax arises. Many clients filing four or five years at once find that the later profitable years generate no US liability at all — not because of the foreign tax credit, but because of the loss stack built in the earlier years.
- The carryforward must be disclosed and evidenced even in years where nothing is deductible. The IRS has no independent record of a suspended loss. The Form 8582 worksheet is the record. A year skipped is a schedule broken.
What happens to losses from years that fall outside the filing package?
The IRS Streamlined Filing Compliance Procedures require a defined number of years of delinquent returns — for the Streamlined Foreign Offshore Procedures, generally the three most recent years for which the due date has passed, together with six years of FBARs. But the flat may have been let for a decade.
A suspended loss carryforward is a balance, not a refund claim. It is not extinguished by the expiry of the refund statute of limitations, in the same way a net operating loss carryforward survives from closed years. In principle, losses arising in years before the streamlined window can be brought forward into the first filed year — provided they can be properly computed and substantiated, with contemporaneous UK letting statements, agent accounts, completion statements and mortgage records supporting each figure. In practice, this is where the value sits and where the documentation burden bites. A client who can evidence eight years of losses and only files three has left the other five on the table permanently.
Our approach on a streamlined submission is to compute the full loss history behind the scenes even where only three years are filed, and to carry the substantiated pre-window balance into the earliest filed Form 8582 with a supporting schedule. Do not let the length of the filing package determine the length of the loss history.
Why does a corrected return produce a loss when the client thought the flat was profitable?
Because the US return recognises deductions the UK return does not, and because the corrected return usually fixes years of unclaimed depreciation.
Foreign property is required to be depreciated under the Alternative Depreciation System, straight line, because it is used predominantly outside the United States. For residential rental property placed in service after 31 December 2017 the ADS recovery period is 30 years; for property placed in service before that date it is generally 40 years. Nothing is elective about this. Depreciation is deemed to have been taken whether or not it was claimed, so an owner who filed without it has both overpaid in the past and created a basis problem for the future.
The remedy is not a string of amended returns. Correcting an impermissible depreciation method is a change in accounting method requiring Form 3115, which produces a single catch-up adjustment under section 481(a) in the year of change. And here is the point that generalist advisers miss: that catch-up adjustment lands inside the rental activity. It is a passive deduction. It does not generate a refund cheque — it enlarges the suspended loss balance. Clients who expect a large repayment from the depreciation fix need to be told, at the outset, that they are building an asset that pays out on sale.
US versus UK: the same building, two irreconcilable loss computations
The genuine cross-border trap is that HMRC and the IRS can look at identical rent and identical outgoings and reach opposite conclusions. Restricted finance costs mean many UK landlords show a taxable profit to HMRC while showing a substantial loss to the IRS on the same flat in the same year.
| Feature | US (IRS) | UK (HMRC) |
|---|---|---|
| Mortgage interest on the let property | Deductible in full against rental income on Schedule E | Not an expense for individual landlords of residential property; relieved instead as a basic-rate tax reducer |
| Depreciation / capital allowances on the building | Mandatory ADS depreciation, 30 or 40 years straight line | No depreciation deduction on residential property; replacement of domestic items relief only |
| Can a loss offset employment income? | No — suspended under section 469 unless the taxpayer qualifies under the special allowance or as a real estate professional | No — carried forward against future profits of the same property business |
| Are UK and overseas properties one business? | Activities may be grouped as a single economic unit, with a written grouping disclosure | UK property business and overseas property business are statutorily separate; losses cannot cross |
| What happens to unused losses on sale? | Suspended losses are released and become fully deductible against any income | Losses cannot be carried forward once the property business ceases — they are simply lost |
| Currency | Every figure translated to USD; basis fixed at the historic acquisition rate | Computed in sterling throughout |
| Loss carryforward period | Indefinite | Indefinite while the property business continues |
The final row of that table is the asymmetry that costs money. HMRC's Property Income Manual at PIM4210 confirms that property business losses are carried forward automatically against future profits of the same property business, but cannot be set against general income and cannot survive the cessation of that business. Sell the only UK rental and the UK loss pool evaporates. Sell the same flat and the US suspended loss pool is released. A client who owns one property in each jurisdiction, or who is winding down a UK portfolio, needs the disposal sequence modelled before contracts are exchanged, not afterwards.
What happens to the foreign tax credit while the losses sit suspended?
A second mismatch compounds the first. Where HMRC assesses a profit and the IRS records a loss, UK tax has been paid on income the US return does not recognise. The resulting foreign tax credit generally falls in the passive category basket, and in a loss year there is no passive category US tax for it to reduce. The credit does not evaporate — it carries back one year and forward ten — but it is a wasting asset with a fixed expiry, unlike the passive loss beside it which has none.
Modelling the two together is the heart of competent US-UK tax return preparation. There is little point creating an enormous suspended loss in years where it strands foreign tax credits that will expire before the property is ever sold. The sequencing of a restatement, and the accounting method positions taken within it, should be chosen with both balances in view.
Two limitations that bite before section 469 does
Passive activity limitation is the third gate, not the first. Two others sit in front of it and are frequently skipped in restated returns:
- Basis. A loss is only deductible to the extent of the owner's adjusted basis in the property, computed in US dollars at the historic acquisition exchange rate — not the current rate, and not revalued annually. Sterling depreciation against the dollar since purchase does not reduce US basis, and a client who bought in 2007 at a very different rate will find their USD depreciation deductions substantially larger than the sterling figures suggest.
- At-risk rules under section 465. Losses are allowed only to the extent the taxpayer is at risk. A UK mortgage from a commercial bank actively and regularly engaged in the business of lending will generally constitute qualified nonrecourse financing for real property, preserving the at-risk amount — but a loan from a family trust, an offshore company or a related party may not, and the at-risk limitation can suspend a loss on a different and less favourable footing than section 469.
How and when are suspended losses finally released?
Publication 925 sets out the release mechanism precisely. On a disposition of the taxpayer's entire interest in the passive activity, in a fully taxable transaction, to a person who is not a related party, all suspended losses from that activity become deductible — subject still to the at-risk and basis limitations.
Each element of that test carries weight:
- Entire interest. Selling one flat out of a grouped portfolio may release nothing if the activities were grouped as a single economic unit. Grouping decisions taken casually in year one determine the release outcome in year nine.
- Fully taxable. Gifting the flat to a child, transferring it to a family investment company, settling it on trust, or contributing it to a partnership are not fully taxable dispositions. Suspended losses are not released; in some transfers they attach to the transferee's basis instead. Selling to a connected party fails the related-party test outright.
- Released against any income. Once released, the losses are no longer passive in character. They are available against the capital gain on the sale itself, and against ordinary income — salary, bonus, interest — in the year of disposal.
Why the year of sale is the year that needs planning
The disposal year is where every cross-border thread converges at once. In a single tax year the client can face: a US capital gain computed in dollars on a historic dollar basis; a UK capital gains tax charge computed in sterling, reportable and payable to HMRC within the 60-day residential property window if UK-resident, or under the non-resident CGT rules if not; a separate ordinary gain under section 988 on repaying a sterling mortgage that has weakened against the dollar since drawdown; and the release of every suspended passive loss accumulated since acquisition.
Those items do not net cleanly. Section 988 mortgage gain is ordinary income, not capital. The released passive losses are ordinary in character and can absorb it — which is exactly why the sale year is often the only year in the property's life when the numbers work in the client's favour, and exactly why it must not be stumbled into. Where a substantial suspended loss exists, the timing of the sale relative to a bonus year, an exit, or a change of residence is a material planning decision for high-net-worth clients, and one that should be taken twelve months out.
What a properly built restatement looks like
For a US owner of a London rental restating several years at once, the file we build contains, at minimum: a year-by-year Schedule E in USD at the correct annual average rates; a Form 8582 for every year in sequence with an unbroken carryforward trail; a Form 3115 where depreciation was never claimed or was claimed on the wrong life; a Form 1116 analysis showing the passive basket credit position and expiry profile alongside the loss balance; a reconciliation to the UK self-assessment property pages showing exactly why the two numbers differ; and, where the property sits in or alongside other structures, the Form 8858 and information return analysis that flows from it.
The output the client actually receives is simpler: a single number for the suspended loss balance, an explanation of what it is worth and when it pays out, and a clear statement that it is an asset with a maturity date set by the sale, not a refund. That is the honest answer, and it is far more useful than the optimistic one.
If you own UK residential property and have unfiled or incorrectly prepared US returns, the loss position is almost certainly better than you fear and the mechanism almost certainly different from what you have been told. Our UK tax specialists and US preparers work the same file, so the sterling and dollar positions are reconciled rather than assumed. To review your loss history, your carryforward balance and your disposal timing in confidence, contact our cross-border team to arrange a confidential consultation. Further reading is available across our cross-border guides.
