Streamlined Domestic Offshore Procedure: UK Rental Flat

The Streamlined Domestic Offshore Procedure lets a US-resident American who never reported the rent from a London flat correct three years of returns and six years of FBARs for a single 5% penalty. The flat itself sits outside that penalty base. The UK accounts that received the rent sit inside it.

That distinction is the whole economic case for this route, and it is the point most general guides to the procedure skip. At Jungle Tax we prepare these submissions for Americans who lived in London, bought a home there, moved back to New York, Boston or the Bay Area, and kept the flat as a buy-to-let. The rent was collected by a UK letting agent, UK tax was dealt with (or assumed to be dealt with) in the UK, and nothing reached the US return. This guide covers only that fact pattern: the three amended returns with Schedule E, the six FBARs, the penalty base, the Form 14654 narrative, and keeping the UK side compliant as a non-resident landlord.

Why does a UK rental create a US filing failure at all?

The United States taxes its citizens and residents on worldwide income. Rent from a flat in Kensington is taxable in the US in the year it is earned, whether or not a pound of it was ever remitted to a US account and whether or not the UK has already taxed it. The US-UK income tax treaty does not change that. Article 6 allows the UK to tax income from real property situated in the UK, and the treaty's saving clause preserves the right of the US to tax its own citizens and residents as if the treaty did not exist. Double taxation is relieved by a foreign tax credit on the US return, not by leaving the income off it.

In practice there are usually three separate failures, and the streamlined submission has to cure all of them:

• Income. The UK rent, net of US-allowable expenses and depreciation, was never reported on Schedule E.
• FBAR. The UK current account, any savings or offset account linked to the UK mortgage, and money held on your behalf by the letting agent were never reported on FinCEN Form 114, although their combined value exceeded $10,000 at some point in the year.
• Form 8938. Where the same UK accounts exceeded the higher FATCA thresholds for a US resident ($50,000 at year end or $75,000 at any time for a single filer, and double those figures for a joint return), Form 8938 was also missing from the return.

Schedule B is often the fourth problem. Part III asks whether you had a financial interest in a foreign account. A return on which that box was ticked "No", or left blank, has to be explained in the certification.

Who can use the domestic route with a UK flat?

The IRS streamlined domestic procedures are open to a US citizen or green card holder who meets all of the following:

• You do not meet the non-residency test, which in broad terms means you were not physically outside the United States for at least 330 full days in any one of the three most recent tax years. A returning expatriate who has been back for more than three years is firmly on the domestic side of that line.
• You have already filed a US return for each of the three most recent tax years for which the due date has passed. The domestic route amends returns; it does not accept first-time filings.
• You failed to report gross income from a foreign financial asset and pay the tax on it, and may also have missed FBARs or international information returns.
• Your conduct was non-willful: the result of negligence, inadvertence or mistake, or a good-faith misunderstanding of what the law required.
• The IRS has not already opened a civil examination of any of your returns, you are not under criminal investigation, and you hold a valid Social Security number.

Our broader guides on the streamlined procedures deal with the residency test and the never-filed problem in detail. What follows assumes you clear those gates and concentrates on what the UK rental does to the submission.

What goes into the submission?

For a package assembled in late 2026, the typical covered periods are tax years 2023, 2024 and 2025 for the amended returns and calendar years 2020 through 2025 for the FBARs, subject to where your own filing extensions fall. The package contains:

• Three amended returns on Form 1040-X, each with Schedule E for the UK property, Form 1116 for the UK tax credit, Form 8960 for the net investment income tax, a corrected Schedule B and, where the thresholds are met, Form 8938.
• Six FBARs, filed electronically through the BSA E-Filing System with the late-filing reason given as "Other" and the explanation "Streamlined Filing Compliance Procedures".
• Form 14654, the signed certification of non-willful conduct, which also carries the penalty computation.
• Payment in full of the additional tax, statutory interest and the 5% miscellaneous offshore penalty.

The returns and certification go on paper to the dedicated IRS unit in Austin, Texas, with "Streamlined Domestic Offshore" written in red at the top of the first page of each amended return. Accuracy-related, failure-to-file and information-return penalties are not asserted on a compliant submission; the 5% payment stands in their place.

How is the UK rental reported on the three amended returns?

This is where a rental submission differs from an accounts-only submission. The tax computation is not a matter of adding a column of interest. It is a full reconstruction of a property business under US rules, in dollars, for each year.

Schedule E: income and expenses under US rules

Gross rent is reported on Schedule E (Form 1040) on a calendar-year basis, not the UK's 6 April to 5 April year, so the agent's statements have to be re-cut month by month. US-allowable deductions include letting and management fees, service charge and ground rent on a leasehold flat, insurance, repairs, council tax where the landlord bears it, professional fees and travel that is properly attributable to the letting. Mortgage interest on the debt that financed the property is deductible in full on Schedule E. That is a sharp contrast with the UK, where an individual landlord's finance costs are not deducted from rental profit at all and instead attract only a basic-rate tax reduction.

Depreciation: allowed or allowable

The UK gives no deduction for the cost of a residential building. The US requires one. Residential rental property located outside the United States is depreciated under the Alternative Depreciation System on a straight-line basis: over 30 years where the property was placed in service as a rental after 2017, and over 40 years where it was placed in service before 2018. The rules are set out in IRS Publication 527. Three practical points matter for a former home in London:

• Depreciable basis. When a former residence is converted to a rental, the starting basis is the lower of its adjusted cost and its market value on the date of conversion, translated into dollars at the exchange rate on the relevant date. Land is not depreciable. A London flat is normally held on a long lease rather than freehold, and the allocation between the building and the land interest needs a defensible method.
• Allowed or allowable. Your basis is reduced by the depreciation you were entitled to claim whether or not you claimed it. A landlord who skips depreciation does not preserve basis; the gain on a later sale is computed as if the deduction had been taken. The three amended returns therefore claim it.
• Earlier years. Depreciation for rental years that fall before the three-year window is not automatically lost. It can often be recovered through an accounting method change rather than through amended returns, and that should be reviewed as part of the same exercise.

Sterling to dollars

Every figure on a US return is in dollars. Rent and running expenses received and paid evenly through the year are normally translated at the yearly average rate, and the IRS publishes a set of yearly average currency exchange rates that it will accept. One-off items, such as a roof repair or a lump-sum payment of UK tax, are better translated at the rate on the date of the transaction. Acquisition cost uses the historical rate. FBAR values are a different exercise again: the maximum balance of each account in the year is converted at the US Treasury's published year-end rate. Whatever method is used must be applied consistently across all three returns.

UK tax as a foreign tax credit

UK income tax on the rent is a creditable foreign income tax. That includes tax withheld by the letting agent under the Non-Resident Landlord rules and any balance paid through Self Assessment. It is claimed on Form 1116, generally in the passive category, and it is limited to the US tax attributable to the foreign-source rental income. Two things usually follow for a high earner.

First, the UK tax is often larger than the US tax on the same rent. The UK taxes a higher profit (no depreciation, no full deduction for interest) at 40% or 45%, while the US taxes a lower profit after depreciation and interest. The credit then eliminates the regular US income tax on the rent and leaves an excess credit, which can be carried back one year and forward ten.

Second, the credit does not, on the IRS's reading of the Code, reduce the 3.8% net investment income tax. A taxpayer above the income threshold ($200,000 single, $250,000 joint) typically owes that tax on net rental income regardless of how much UK tax was paid. On many amended returns in this fact pattern, the net investment income tax plus interest is the bulk of the additional liability.

A timing mismatch needs care. UK tax for the year to 5 April is partly withheld in real time and partly settled the following 31 January. A cash-basis taxpayer claims the credit when the tax is paid unless an election is made to claim it on an accrual basis, and that election, once made, binds later years.

Passive losses and the mortgage

If depreciation and interest push the US result into a loss, the passive activity rules decide whether it can be used. The $25,000 allowance for actively managed rental real estate phases out between $100,000 and $150,000 of modified adjusted gross income, so for most of our clients the loss is suspended, tracked on Form 8582 and released against future rental profit or on sale. Depreciation still counts as allowable even where the loss it creates is suspended.

A sterling mortgage has its own US consequence. Repaying or refinancing foreign-currency debt when the pound has weakened against the dollar since the loan was drawn can produce a taxable exchange gain, even though nothing has been sold. A remortgage or a capital repayment inside the three amended years should be examined for that.

US and UK treatment of the same London rental compared

Issue	United States (IRS)	United Kingdom (HMRC)
Basis of charge	Citizen or resident taxed on worldwide income	Non-resident taxed on UK-source property income
Tax year	Calendar year	6 April to 5 April
Return	Form 1040 with Schedule E, Forms 1116 and 8960	SA100 with SA105 (UK property) and SA109 (residence)
Building cost	Depreciated straight-line over 30 years (40 if placed in service before 2018)	No deduction for a residential building
Mortgage interest	Deductible in full against rent	No deduction; basic-rate tax reduction only
Withholding at source	None	20% by agent under the Non-Resident Landlord rules unless HMRC approves gross payment
Double tax relief	Foreign tax credit for UK tax; not available against the 3.8% net investment income tax	UK has primary taxing right under Article 6 of the treaty
Losses	Passive loss limits; suspended losses carried forward	Carried forward against future UK property profits
Account reporting	FBAR over $10,000 aggregate; Form 8938 over $50,000 / $75,000 (single, US resident)	No equivalent for a UK account held by a non-resident
Normal filing date	15 April, extendable to 15 October	31 January following the tax year (online)

What is inside the 5% penalty base, and what is not?

The miscellaneous offshore penalty is 5% of the highest aggregate year-end value of the foreign financial assets that fall within the base, looking across the six-year FBAR period and the three-year return period. An asset is in the base for a year if it should have been reported on an FBAR and was not, should have been reported on Form 8938 and was not, or was properly reported but gross income in respect of it was left off the return.

Is the London flat itself in the penalty base?

No. The IRS addresses this directly in its streamlined domestic FAQs. Question 2 concerns a US resident who owns an income-producing rental property abroad that is not reportable on an FBAR or Form 8938, and the answer is that an asset of a kind not reportable on either form is not included in the penalty base, whether or not it was tax compliant. Directly held foreign real estate is not a financial account and is not a specified foreign financial asset. A flat worth £1.5 million that generated every pound of the unreported income therefore contributes nothing to the 5% computation.

Which UK accounts are in the base?

• The UK current account into which the agent paid the net rent, and from which the mortgage was serviced.
• Savings and offset accounts linked to the UK mortgage. The mortgage is a liability and is not reportable. A savings balance held against it is a financial account like any other, and offset balances can be substantial.
• Funds held for you by the letting agent. Where an agent holds rent on your behalf in a client account, the FBAR rules can treat you as having a financial interest in that money because the account holder is acting as your agent. The year-end float is usually modest, but we include it rather than argue about it.
• Anything else you left behind: a stocks and shares ISA, a cash ISA, premium bonds, a workplace pension or SIPP. These are not part of the rental, but if they were unreported they enter the same computation, and UK pension balances frequently dominate it.

Ownership structures that change the answer

The exclusion applies to real estate held directly. If the flat is owned through a UK limited company, the shares are a specified foreign financial asset and their value enters the base, with no valuation discount, alongside the Form 5471 that should have been filed. Joint ownership with a spouse works in the other direction: the IRS FAQs confirm the penalty is aimed at your personal financial interest, and a couple filing jointly make one certification and pay one penalty.

A worked illustration

Take a returning executive with a flat valued at £1,500,000, let at £84,000 a year. At the highest of the six year ends she held £52,000 in a UK current account, £140,000 in an offset savings account and £7,000 with the agent: £199,000 in total. At an illustrative rate of $1.27 to the pound that is $252,730, and the penalty is $12,637. Had the flat been in the base, the figure would have exceeded $100,000. The absence of the property from the computation is the reason the domestic route is so much cheaper for a landlord than a first reading of "5% of your foreign assets" suggests. You can model your wider exposure outside the programme with our FBAR penalty calculator.

How should a returning expatriate write the Form 14654 narrative?

The certification is signed under penalty of perjury, and the narrative is the part the IRS actually reads. The IRS FAQs ask for specific reasons for the failure, your personal and financial background, the source of the funds in each foreign account, your contacts with those accounts, and an explanation of any professional advice you received. A statement that you "did not know" is not enough on its own.

For this fact pattern a credible narrative normally covers:

• When and why you moved to the UK, when you bought the flat, and that it was your home before it was let.
• When and why you returned to the US, and the decision to keep the property.
• How the letting was run: an agent collected the rent, deducted fees and, where it applied, UK tax, and paid the balance to a UK account.
• What you believed about the US position and why, for example that rent taxed in the UK on a UK property was a UK matter.
• What you told your US preparer, what the preparer's questionnaire asked, and how the foreign account question on Schedule B came to be answered as it was.
• How you found out, and how quickly you acted once you did.

Unfavorable facts belong in the narrative too. If a preparer's organizer asked about foreign accounts every year, say so and explain your answer. If your facts leave real doubt about whether the conduct was non-willful, that is a legal question to put to a US tax attorney before anything is filed. We prepare the returns and the computation; we do not sign off on willfulness where the facts are contested.

How do you stay compliant with HMRC as a non-resident landlord?

A US submission that claims credit for UK tax rests on the UK side being correct. Once your usual place of abode is outside the UK, the Non-Resident Landlord rules apply. Your letting agent must withhold basic-rate tax, currently 20%, from the rent net of the expenses the agent pays, and account for it to HMRC quarterly, unless HMRC has approved you to receive rent gross following an application on form NRL1. The agent gives you an annual certificate of tax deducted, which is the primary evidence for the US credit.

Neither withholding nor gross-payment approval is the end of the matter. A non-resident landlord files a UK Self Assessment return with the UK property pages (SA105) and the residence pages (SA109), normally by 31 January after the end of the tax year. HMRC's own online service does not support the residence pages, so the return is filed through commercial software or on paper. The return reconciles the 20% withheld with the true liability at 40% or 45% for a higher earner, after the basic-rate reduction for finance costs.

If the UK returns were also missed, for instance because gross-payment approval was granted and then forgotten, the UK position needs its own disclosure and the two should be planned together. UK tax settled late still generates a US credit, but the year in which it is creditable depends on the method you use, and getting the sequencing wrong can strand the credit.

Two forward-looking UK changes are relevant to anyone keeping the flat. Making Tax Digital for Income Tax, with quarterly digital reporting, began in April 2026 for landlords with gross qualifying income above £50,000, with a deferral for some taxpayers who file the residence pages. And from April 2027 the UK is due to introduce separate, higher rates of income tax on property income of 22%, 42% and 47%, which will increase the UK tax and, with it, the excess US credit.

What the submission does not fix

• State returns. The procedure is federal. California, New York and most other states tax residents on worldwide income, generally without a foreign tax credit for UK tax. State returns should be amended in parallel, and the state cost can exceed the federal one.
• Years outside the window. The IRS does not require amended returns for earlier rental years under the procedure, but depreciation for those years still reduces your basis.
• The eventual sale. The US computes the gain in dollars using historical exchange rates, so a sterling loss can be a dollar gain. Depreciation allowed or allowable is taxed on sale at a maximum 25% rate. In the UK a non-resident must report the disposal of UK residential property and pay any capital gains tax within 60 days of completion. The US home-sale exclusion depends on having lived in the flat for two of the five years before sale, a test a long-returned owner will usually fail.
• Finality. There is no closing agreement. The amended returns are processed in the ordinary way and remain open to examination, which is why the Schedule E figures need to be supported by agent statements, mortgage statements and a documented basis computation.

How we prepare a UK-rental SDOP submission

1. Collect the record. Six years of agent statements, UK bank and mortgage-linked account statements, the completion statement for the purchase, UK tax returns and agent tax certificates.
2. Rebuild the rental on a US basis. Calendar-year income and expenses, depreciable basis and conversion-date value, the depreciation schedule, sterling translation and any exchange gain on the mortgage.
3. Compute the credit and the residual tax. Form 1116 by year, carryovers, net investment income tax and interest.
4. Prepare the six FBARs and Forms 8938, and from them the year-end penalty base on Form 14654.
5. Draft the narrative with you, from your own account of events, and refer to counsel where willfulness needs a legal view.
6. Align the UK side. Bring Self Assessment up to date and put the current year on a compliant footing in both countries, working with our US tax and UK tax teams as a single engagement.

Bringing a kept London flat back into compliance

For a US-resident American, an unreported UK rental is among the more favorable facts to bring to the streamlined domestic route. The most valuable asset is outside the penalty, the UK tax already paid absorbs most of the US income tax, and what remains is usually the net investment income tax, interest, state tax and 5% of account balances. The risk lies in the detail: a basis computation that will be relied on at sale, a credit claimed in the right year, and a certification that has to be accurate. As specialist US-UK tax accountants, we prepare both sides of the file. To discuss your position in confidence, contact our cross-border team for a confidential consultation.