Can I use the Streamlined Foreign Offshore Procedures if I owe US tax on a company sale?

Yes. The procedures are not restricted to people who owe little. The test is non-willful conduct plus non-residency. You must pay the full tax and statutory interest shown on the returns with the submission. In exchange, failure-to-file, failure-to-pay, accuracy-related, information return and FBAR penalties do not apply for the covered years, and the foreign version has no miscellaneous offshore penalty.

Does UK Business Asset Disposal Relief apply to my US tax return?

No. BADR is a UK relief that reduces the UK capital gains tax rate on qualifying business disposals, and the US has no equivalent. Because the US foreign tax credit is limited to the UK tax actually paid, a lower UK charge under BADR usually leaves more US tax to pay on the same gain, not less.

Why do missing Form 5471s matter if the company has already been sold?

Because they carry the company's earnings history, any earlier income inclusions and the information needed to apply section 1248 to the gain. They also control the statute of limitations: under section 6501(c)(8), assessment periods for related returns stay open until three years after the information is supplied. Preparing them first prevents the sale-year return from needing amendment later.

Do I report the sale to HMRC and the IRS in different tax years?

Often, yes. HMRC taxes the gain in the UK tax year running to 5 April, while the IRS taxes it in the calendar year in which the sale completed. A sale in June falls in one UK tax year but a single US calendar year. The UK capital gains tax is matched to the US year in which the gain is reported when claiming the foreign tax credit.

Must sale proceeds held in UK bank accounts be reported to the IRS?

Yes, if you are a US citizen. An FBAR is required when the aggregate of your foreign accounts exceeds $10,000 at any time in the year, and Form 8938 applies to taxpayers abroad above $200,000 at year end or $300,000 at any time for single filers. Every account the proceeds passed through must be listed, including short-term deposit accounts.

Missed US Tax Returns After Selling a UK Company

Q: Can UK capital gains tax offset the US net investment income tax?

In practice, no. The 3.8% net investment income tax applies to capital gains where modified adjusted gross income exceeds the statutory threshold, and under the regulations the IRS applies, foreign tax credits do not reduce it. For a UK-resident US citizen selling a company, the net investment income tax is usually a cash cost even when UK tax covers the regular US capital gains tax.

Missed US tax returns in the year you sold a UK company can still be put right, and for most US citizens living in the UK the route is the IRS Streamlined Foreign Offshore Procedures, provided the failure to file was non-willful. The size of the gain does not disqualify you. What changes is the work: the sale year has to be reported in full, the UK capital gains tax has to be converted into a US foreign tax credit, any US tax the credit does not cover has to be paid with interest, and the Form 5471 information returns for the company, usually missing for every year you owned it, have to be prepared before the sale itself can be reported correctly.

In the catch-up returns we prepare for founders and shareholders who have sold a UK trading company, the sale year is almost always the single largest number in the file and the year most likely to be examined. This guide sets out why, what has to be reconstructed, and the order in which we work so that nothing filed later contradicts what was filed first.

Why is the sale year the highest-stakes year of your missed US tax returns?

A US citizen is taxed by the United States on worldwide income wherever they live, so a share sale that HMRC has already taxed is still reportable on Form 1040. In an ordinary year of missed filing for a salaried UK resident, the foreign tax credit or foreign earned income exclusion often reduces the US tax to little or nothing. A business sale breaks that pattern for three reasons.

The gain is large relative to every other year, so any mistake in basis, exchange rates or sourcing produces a large US tax difference.
US long-term capital gains rates and UK capital gains tax rates do not line up, and where UK relief has reduced the UK charge there is usually residual US tax to pay.
The net investment income tax applies on top of the regular capital gains rate, and in practice UK tax does not offset it.
The sale is the year in which the IRS is most likely to ask questions, because the missing Forms 5471 for the company and the sale proceeds sitting in UK accounts both point to it.

On rates, IRS Topic 409 at https://www.irs.gov/taxtopics/tc409 sets out the 0%, 15% and 20% bands for long-term gains; for 2025 the 20% rate applies to taxable income above $533,400 for a single filer and $600,050 for married filing jointly, and the bands are adjusted each year. Shares held for more than one year produce a long-term gain. Founders' shares almost always meet that test, but a late share issue or an option exercised shortly before completion can create a short-term slice taxed at ordinary rates.

The net investment income tax is a 3.8% tax on the lesser of net investment income or the amount by which modified adjusted gross income exceeds a threshold of $250,000 for married filing jointly, $200,000 for single filers and $125,000 for married filing separately, according to the IRS page at https://www.irs.gov/individuals/net-investment-income-tax and capital gains are net investment income, and it is reported on Form 8960. Under the regulations the IRS applies, foreign tax credits do not reduce the net investment income tax, so for a UK-resident seller it is usually a real cash cost on top of whatever regular US tax remains after the credit.

Does UK Business Asset Disposal Relief reduce my US tax?

No. Business Asset Disposal Relief is a UK relief that lowers the rate of UK capital gains tax on qualifying gains; the United States has no equivalent and does not recognise it. According to https://www.gov.uk/business-asset-disposal-relief the BADR rate was 10% for disposals on or before 5 April 2025, 14% for disposals from 6 April 2025 to 5 April 2026, and 18% for disposals from 6 April 2026. To qualify on a share sale the seller generally must have been an officer or employee of a trading company or trading group, and the company must have been their personal company, broadly at least 5% of shares, votes and economic rights, for at least two years before the sale.

The irony for a US citizen is that BADR, which is valuable in the UK, increases the US bill. The foreign tax credit can only offset US tax up to the amount of UK tax actually paid, so the lower the UK rate, the larger the gap between UK tax and the US charge on the same gain. Disposals that fell in the 10% BADR window are the ones where we most often see a substantial residual US liability in the sale year.

How is UK capital gains tax credited on the US return?

UK capital gains tax paid on the sale is claimed as a foreign tax credit on Form 1116, and three questions decide how much of it works: where the gain is sourced, which category it falls into, and how the credit limitation is calculated. The Form 1116 instructions at https://www.irs.gov/instructions/i1116 cover each point.

Source: gain on the sale of non-depreciable personal property, such as shares, is generally sourced by the seller's residence, which for a US citizen would normally make it US source. The instructions treat the gain as foreign source where you sold it while maintaining a tax home outside the United States and at least 10% of the gain was paid in foreign tax. A UK-resident seller paying UK CGT on the gain usually meets this; at the lowest BADR rate we check the effective percentage carefully. Treaty resourcing is a further route where the domestic rule does not apply.
Category: capital gains not related to the active conduct of a trade or business are generally passive category income. A share sale by an individual normally lands in the passive basket. The high-taxed income exception moves passive income to the general category where the foreign tax on it exceeds the highest US tax that can be imposed on it; with BADR rates below the US rate this rarely applies to a founder's gain, but it can apply to other gains taxed in the UK at a higher rate.
Rate differential adjustment: because the US taxes the gain at a preferential rate, foreign-source capital gains are scaled down in the limitation fraction, by 0.5405 for gains taxed at 20% and 0.4054 for gains taxed at 15%, so that the credit cannot shelter tax on ordinary income.
Currency: UK tax paid is converted at the exchange rate on the day it was paid, for a cash-basis individual. UK CGT is often paid many months after completion, at a different rate from the one used for the proceeds.

Timing is a common mismatch. The UK charge falls in the UK tax year ending 5 April, while the US gain falls in the calendar year of completion. A sale completed in February sits in one UK tax year and one US year; a sale in June sits in a UK tax year that straddles two US years. The UK tax still relates to the gain, and we match it to the US year in which the gain is reported.

What does section 1248 change, in short?

If you owned 10% or more of the voting power of a UK company that was a controlled foreign corporation, section 1248 can recharacterise part of the gain on sale as a dividend, to the extent of the company's earnings and profits that have not already been taxed in the US. That changes the character of part of the income, which in turn affects the rate and the foreign tax credit category. We have covered the mechanics, and related questions on deferred consideration and change-of-control payments, elsewhere; in a catch-up the practical point is that you cannot run the section 1248 calculation without the earnings and profits history that the missing Forms 5471 would have recorded, which is why those forms come first.

What happens to the missing Form 5471s for the years before the sale?

Most UK founders who never filed US returns also never filed Form 5471, the information return for US persons with interests in foreign corporations. A UK company owned more than 50% by US shareholders is a controlled foreign corporation, and each US shareholder of 10% or more typically has a filing obligation for every year of ownership. A filer who meets both Category 4 and Category 5a checks only Category 4. In the year of sale, the disposal itself is a reportable event, so the sale year usually needs a final Form 5471 as well.

These forms matter for three reasons beyond compliance. First, they may carry income inclusions, under subpart F or the GILTI regime, that belong on the earlier returns. Second, amounts included in income in earlier years create previously taxed earnings and basis adjustments that can reduce the gain or the section 1248 dividend in the sale year. Third, and most important for a catch-up, they control the statute of limitations.

Under 26 USC 6501(c)(8), set out at https://www.law.cornell.edu/uscode/text/26/6501 where information required under section 6038 (which includes Form 5471) or section 6038D (Form 8938) has not been furnished, the period for assessing tax for the related return does not end until three years after the information is provided. If the failure was due to reasonable cause and not willful neglect, the extension applies only to the items related to the failure rather than to the whole return. The same section provides that where no return is filed at all, tax may be assessed at any time. Put together, a sale year with no Form 1040 and no Form 5471 has no running clock, and the clock only starts once complete returns, with the information returns attached, are received.

Can I still use the Streamlined procedures if I owe significant US tax?

Yes. The Streamlined Foreign Offshore Procedures are not limited to taxpayers who owe little or nothing; the test is non-willful conduct, not the size of the bill. The IRS page at https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-outside-the-united-states requires the full amount of tax and interest due in connection with the filings to be remitted with the submission. In return, taxpayers who comply are not subject to failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties for the covered years. The foreign version carries no miscellaneous offshore penalty; that 5% charge belongs only to the Streamlined Domestic Offshore Procedures.

The conditions for a US citizen are summarised below:

Non-residency: in at least one of the three most recent years for which the US return due date has passed, you had no US abode and were physically outside the United States for at least 330 full days.
Non-willfulness: the failures resulted from negligence, inadvertence or mistake, or a good faith misunderstanding of the law, certified with a specific narrative on Form 14653.
Submission: the three most recent delinquent Forms 1040 with all information returns attached, including Forms 5471, 8938 and 3520 where they apply, and six years of FBARs filed electronically through FinCEN's BSA E-Filing System.
Payment: the tax shown and statutory interest, sent with the paper submission to the address the IRS specifies.
No current IRS examination or investigation for the affected years.

Two cautions apply to a business sale. First, a large undeclared gain draws scrutiny of the non-willful certification, so the narrative must explain truthfully why the filing obligation was not understood, and it must be consistent with the documents a reviewer could see, such as sale agreements that mention US tax. Second, the procedures ask for the three most recent years. If the sale completed in an earlier year, it falls outside that window. Because no return was filed for it, the statute has not started, and we discuss with the client whether to file that year as well rather than leave the largest liability unaddressed. The published penalty relief also does not mention the estimated tax underpayment addition, so we calculate it and expect it to apply.

How do you reconstruct the cost basis of founder shares?

US basis is what you paid for the shares, in dollars, adjusted for later events. Founders often subscribed for a nominal amount, then invested more through later share issues, loan conversions or rights issues, and may have received shares on option exercises. Each tranche is its own lot with its own acquisition date and exchange rate. We rebuild it from Companies House filings of allotments, the company's statutory register of members, subscription agreements, bank evidence of payment and, for employee shares, the option and exercise documentation.

Basis items that differ between the two systems need care. UK share identification and pooling rules are not the US rules, and UK reliefs claimed on subscription have no US basis effect. Amounts taxed as employment income on acquiring shares can increase US basis if they were, or should have been, included in US income. Previously taxed earnings and section 961 adjustments from the reconstructed Forms 5471 also affect basis. Selling costs, such as corporate finance and legal fees borne by the seller, reduce the amount realised.

How is the gain converted from sterling to dollars?

The US gain is not the sterling gain multiplied by one exchange rate. Each element is translated at its own date: the cost of each share lot at the rate on the date it was paid, and the sale proceeds at the rate on the date of sale. The difference between those dollar figures is the capital gain. If sterling fell between subscription and sale, the US gain can be noticeably smaller than the sterling gain translated at the sale-date rate; if sterling rose, it can be larger.

Section 988, which governs foreign currency gain and loss on items such as foreign-currency debt and some forward contracts, does not apply to the shares themselves. Stock is not a section 988 transaction, so the currency movement embedded in the share gain is part of the capital gain and is taxed as such. A separate question arises after completion: once proceeds are held in sterling, later conversion or use of that sterling can produce its own currency gain or loss, and deferred consideration paid in sterling is translated when received. We report those separately from the share gain.

Worked scenario: a London founder who never filed

The following figures are an illustration only, with assumed exchange rates; they are not a calculation for any real taxpayer. A US citizen, single, living in London since childhood, has never filed a US return. She founded a UK trading company in 2012, subscribing £1,000 for her original shares, and subscribed £199,000 for new shares in 2016. She sold the whole company by share sale in June 2023 for £6,000,000, paying £120,000 of selling costs, and claimed BADR in the UK.

Assumed rates: 1.58 dollars per pound in 2012, 1.45 in 2016, 1.27 at completion in June 2023, and 1.24 when the UK tax was paid.
US basis: £1,000 at 1.58 is $1,580 and £199,000 at 1.45 is $288,550, so $290,130 in total.
Amount realised: £6,000,000 less £120,000 costs is £5,880,000, which at 1.27 is $7,467,600.
US long-term gain: $7,467,600 less $290,130 is $7,177,470, against a sterling gain of £5,680,000.
UK tax: assume UK CGT of £1,050,000, reflecting BADR on part of the gain and the main rate on the rest, which at 1.24 is $1,302,000 and is more than 10% of the gain, so the gain is foreign source.
US regular tax at 20% on the gain is roughly $1,435,000 before credit; the passive-category credit is limited to the lower of UK tax paid and the US tax on the foreign-source gain, leaving roughly $133,000 of regular US tax.
Net investment income tax of 3.8% on roughly $6,977,000 of income above the $200,000 threshold adds about $265,000, which the UK tax does not offset.
Interest runs on the unpaid US tax from the original due date of the 2023 return, and the estimated tax addition is calculated on top.

On these assumptions she owes the IRS roughly $400,000 plus interest for the sale year, almost all of it attributable to BADR lowering the UK charge and to the net investment income tax. She meets the 330-day test in all three years, so 2023, 2024 and 2025 are the Streamlined years, with FBARs for 2020 to 2025. Her Forms 5471 for 2023 and earlier are prepared first, because the company's earnings history determines whether any part of the gain is a section 1248 dividend, which would change both the rate and the credit, and whether earlier income inclusions created basis that lowers the gain.

Do the sale proceeds in UK accounts trigger FBAR and Form 8938?

Almost certainly. The comparison published at https://www.irs.gov/businesses/comparison-of-form-8938-and-fbar-requirements confirms that an FBAR is required where the aggregate value of foreign financial accounts exceeds $10,000 at any time in the calendar year, filed through FinCEN's BSA E-Filing System rather than with the tax return, due 15 April with an automatic extension to 15 October. For taxpayers living abroad, Form 8938 applies above $200,000 at year end or $300,000 at any time for single filers, and $400,000 or $600,000 for joint filers.

Completion money landing in a UK current account will cross both thresholds immediately, and every account it passes through, including deposit accounts opened to spread balances, must be listed. This is the gap most catch-up files miss: the founder reports the gain but leaves out the accounts that received it. Where proceeds were then invested in UK-domiciled pooled funds, those holdings usually raise passive foreign investment company reporting on Form 8621 for every later year, which is a further reason not to leave the post-sale years unfiled.

What about earn-out payments received in later unfiled years?

Deferred or contingent consideration is reported when it is received or becomes fixed, depending on the method used, so an earn-out paid in 2024 and 2025 creates additional gain in those years even though the main sale was in 2023. Each payment is translated at the rate on its receipt date, any UK tax on it is credited in the matching US year, and part of a deferred payment may be treated as interest. If the earn-out years are within the Streamlined window they are filed in the same submission; if any payment falls in a later year, that return follows the normal filing timetable.

In what order should the catch-up work be done?

We work from the company outward, because each later figure depends on an earlier one:

Confirm eligibility: residence and day counts for the three most recent years, and the facts supporting non-willfulness.
Collect the company's accounts, shareholder registers and corporation tax computations for every year of ownership, and the sale and purchase agreement with completion statements.
Prepare the Forms 5471, including earnings and profits, any subpart F or GILTI inclusions, and previously taxed earnings.
Reconstruct the dollar basis of each share lot and translate the proceeds at the completion-date rate.
Run the section 1248 calculation, then the capital gain, Form 8960 and Form 1116 with the UK tax converted at the payment-date rate.
Prepare the remaining years, including earn-out receipts, investment income on the proceeds, Form 8938 and Form 8621 where needed.
File six years of FBARs electronically, then assemble the paper submission with Form 14653 and payment of tax and interest.

Doing the sale year first and the information returns afterwards is the most expensive mistake we see in this area, because the 5471 work regularly changes the sale-year numbers and forces an amendment. Built in this order, the submission tells a single consistent story from the date you subscribed for your first share to the day the proceeds reached your account, and the statute of limitations on those years finally starts to run.