Can I use the Streamlined Foreign Offshore Procedures after selling my UK company?

Yes, if you meet the non-residency test, your failures were non-willful and the IRS has not opened a civil examination or criminal investigation. The sale is reported on the three streamlined Forms 1040 in US dollars, the company on delinquent Forms 5471 filed with them, and FBARs for six years are filed separately. Selling the company does not disqualify you, but the sale documents must be consistent with your non-willfulness certification on Form 14653.

What if my UK company sale happened before the three streamlined years?

The sale year is not one of the required streamlined returns, but it may still be open. Under IRC 6501(c)(8), where a required Form 5471 was never filed, the IRS can assess related tax until three years after the information is furnished. We review that year separately and decide whether it should be filed alongside the streamlined submission rather than assuming it is closed.

Does Section 1248 apply to a UK trading company?

It applies if the company was a controlled foreign corporation and you owned at least 10% of the voting power at any time in the five years before sale. Most founder-owned UK companies with a US citizen majority owner meet that test. The part of the gain matching the company's earnings and profits while it was a CFC is taxed as a dividend, often at the qualified dividend rate because of the US-UK treaty.

Does HMRC's Business Asset Disposal Relief reduce my US tax?

No. BADR is a UK relief and the US taxes the full dollar gain. But BADR affects the UK tax you pay, which drives your US foreign tax credit. GOV.UK sets BADR at 10% to 5 April 2025, 14% for 2025 to 2026 and 18% from 6 April 2026, with a £1 million lifetime limit. A lower UK rate means less credit and potentially more residual US tax.

Will UK capital gains tax offset the 3.8% Net Investment Income Tax?

Under the IRS position, no. The foreign tax credit reduces regular income tax only, and the NIIT is a separate tax, so UK CGT does not reduce it. Some taxpayers claim treaty relief against it, but that is a disclosed, contested position. For a large UK share sale, the NIIT is often the largest US amount still payable after UK tax credits.

Is there a 5% penalty on my business under the streamlined procedures?

Not under the foreign procedures, which carry no penalty. The 5% miscellaneous offshore penalty applies under the Streamlined Domestic Offshore Procedures, for taxpayers who fail the non-residency test. Its base includes foreign financial assets reportable on an FBAR or Form 8938, including foreign stock not held in an account, so UK company shares could be caught for pre-sale years if you must use the domestic route.

Streamlined Foreign Offshore After a UK Business Sale

If you are a US citizen living in the UK who has sold your UK company and only then discovered you never filed US returns, Form 5471 or FBARs, the Streamlined Foreign Offshore Procedures (SFOP) are usually the route for bringing the sale and the missing years into compliance without penalty, provided your failures were non-willful and you meet the non-residency test. The sale itself is reported on the most recent three years of Form 1040 in US dollars, the company is reported on the delinquent Forms 5471 filed with those returns, and UK capital gains tax paid on the disposal is claimed as a foreign tax credit. What the procedures do not do is make the US tax disappear: Section 1248 can turn part of the gain into a dividend, and the 3.8% Net Investment Income Tax is often the one amount UK tax does not cover.

This is one of the most common exit scenarios in the returns we prepare. A founder builds a UK trading company over ten or fifteen years, claims Business Asset Disposal Relief on the sale, settles the UK bill through Self Assessment, and then hears from the buyer's lawyers, a bank's onboarding team or a US relative that American citizens file US returns wherever they live. By then the proceeds are sitting in UK accounts, the company has changed hands and the paper trail for the years of ownership belongs partly to someone else. This guide walks through how that exit is caught up, in the order we actually work it.

What are the Streamlined Foreign Offshore Procedures?

The Streamlined Foreign Offshore Procedures are an IRS compliance programme for individual US taxpayers living outside the United States whose failure to file returns, report foreign income or file FBARs resulted from non-willful conduct. The IRS describes the eligibility and filing requirements at https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-outside-the-united-states. Unlike the domestic version, taxpayers who qualify under the foreign procedures are not subject to a penalty.

Three eligibility conditions matter for a business seller:

Non-residency: a US citizen or green card holder must, in at least one of the three most recent years covered, have had no US abode and been physically outside the United States for at least 330 full days.
Non-willful conduct: the failures must result from negligence, inadvertence, mistake or a good faith misunderstanding of the law, certified on Form 14653 with a written narrative.
No open examination or investigation: if the IRS has started a civil examination of any tax year, whether or not it relates to foreign assets, or IRS Criminal Investigation is investigating you, the streamlined procedures are closed to you, as stated at https://www.irs.gov/individuals/international-taxpayers/streamlined-filing-compliance-procedures.

You also need a valid Social Security Number on every return. Founders who left the United States as children sometimes discover they have never been issued one, and that has to be resolved before the submission can go in.

Which three years must the business sale fall into?

The Streamlined Foreign Offshore Procedures require delinquent or amended returns for each of the most recent three years for which the US return due date, or properly extended due date, has passed, plus FBARs for the most recent six years whose FBAR due date has passed. Where the sale sits against that window changes the work considerably.

Sale in a year already inside the window: the most common case. The gain, any Section 1248 dividend and the final Form 5471 all go into the streamlined returns.
Sale in the current year, whose due date has not yet passed: that year is not a streamlined year. You file the three prior years under SFOP, then file the sale-year return on time in the normal way, with its own Form 5471 and Form 1116.
Sale in a year before the window: the sale year is not one of the three required returns, but that does not mean it is closed. Under IRC 6501(c)(8), if a required Form 5471 was never filed, the assessment period for the related tax does not expire until three years after the information is furnished. We look at that year specifically before deciding the scope of the submission.

Section 6501(c)(8), available at https://www.law.cornell.edu/uscode/text/26/6501, is the reason an older sale cannot simply be left outside the window. If the failure to furnish the information was due to reasonable cause and not willful neglect, the open period is limited to the items related to that failure, but a large share gain on stock of the very corporation that should have been reported is exactly the kind of related item that remains exposed.

How is the UK sale measured in US dollars?

The US measures gain in dollars, not pounds. Your basis is what you paid for the shares, translated at the exchange rate on the date you acquired them, which for most founders is the incorporation date and a nominal subscription of a few pounds. The amount realised is the sale proceeds translated at the rate on the date of sale. Because basis and proceeds are translated at different rates, currency movement is baked into the dollar gain, and it can make the US gain larger or smaller than the UK gain.

Share-for-share or loan-note consideration needs its own treatment. A UK rollover into buyer shares or loan notes may defer UK CGT without the US treating it as a tax-free exchange, and the reverse can also happen. Loan notes and deferred cash raise installment method questions on the US side. We recommend mapping each tranche of consideration separately rather than reporting a single headline figure.

Does Section 1248 turn part of the gain into a dividend?

Section 1248 is the rule that recharacterises gain on the sale of shares in a controlled foreign corporation as a dividend, to the extent of the company's earnings and profits. It applies where you owned 10% or more of the voting power at any time in the five years before the sale while the company was a CFC. A UK company owned mostly by a US citizen founder is very often a CFC, because a CFC is a foreign corporation more than 50% owned by US shareholders by vote or value. The statute is at https://www.law.cornell.edu/uscode/text/26/1248.

In practice this means the part of your gain that represents retained profits the company earned while it was a CFC is taxed as a dividend rather than a capital gain. For a UK company that dividend can generally qualify for the preferential qualified dividend rate because the UK has a comprehensive income tax treaty with the United States, so the rate difference is often smaller than clients fear. The real consequences are elsewhere: the earnings and profits have to be computed in US tax terms for every year the company was a CFC, the dividend portion may fall into a different foreign tax credit category from the capital gain, and the calculation depends on records many founders never kept in US format.

Section 1248(d) removes from the dividend calculation earnings that were already included in your income under section 951, which covers Subpart F and, from 2018, the GILTI inclusion. Those amounts are previously taxed earnings and profits and are tracked on Schedule P of Form 5471. For tax years beginning after 31 December 2025, the GILTI regime was renamed net CFC tested income by the 2025 federal legislation, but the mechanism for a shareholder is broadly the same: an annual inclusion of the company's tested income, with previously taxed earnings excluded when later distributed or when Section 1248 is applied.

Here is the gap nobody explains well. If you never filed, you never made the GILTI inclusions, so the earnings of years outside the streamlined window were never included under section 951 and are generally not previously taxed. Many UK trading companies pay corporation tax at a rate high enough that the high-tax exclusion could have removed tested income altogether, which is an election made on the return. For the streamlined years we evaluate the high-tax election year by year; for earlier years, the untaxed earnings typically sit in the Section 1248 pool instead.

Share sale versus a sale of the trade and assets

Not every UK exit is a share sale. Where the buyer acquires the trade and assets from the company, the gain arises inside the company, which pays UK corporation tax on it. For US purposes that gain is income of a CFC, so it can feed a GILTI or net CFC tested income inclusion, or in narrower cases Subpart F income, on the shareholder's return for the year of the sale. The founder then usually extracts the cash by a members' voluntary liquidation, which UK law often treats as a capital distribution eligible for BADR, while the US treats the liquidation as a sale or exchange of the shares, again subject to Section 1248.

The practical result is two layers of US reporting in the streamlined returns: the company-level gain on Form 5471 and any resulting inclusion, then the shareholder-level liquidation distribution. Getting the order right matters because any amount included at the first layer becomes previously taxed and should not be taxed again at the second.

How do the delinquent Form 5471s fit into the streamlined submission?

Form 5471 is the information return a US person files for certain foreign corporations, and a UK founder is typically a Category 4 filer because they control more than 50% of the company, and a Category 5 filer because they are a US shareholder of a CFC. In the year of sale you may also be a Category 3 filer, because the instructions at https://www.irs.gov/instructions/i5471 include a US person who disposes of enough stock to fall below 10% ownership, with Schedule O reporting the disposition.

Outside the streamlined procedures, the penalty for failing to file is $10,000 for each annual accounting period of each foreign corporation, with a further $10,000 for each 30-day period after IRS notice, up to $50,000. Under SFOP, the IRS says required information returns such as Forms 5471, 3520 and 8938 are filed with the delinquent or amended returns, even if they would normally have been filed separately, and compliant taxpayers are not subject to information return penalties unless the examination of the submission uncovers fraud.

The Forms 5471 in a streamlined submission should include the company's income statement and balance sheet translated into US dollars, the earnings and profits schedules, the related-party transaction schedule covering salary, loans and dividends between you and the company, and the Schedule I-1 tested income computations. The Streamlined Foreign Offshore Procedures cover the three years; they do not cure missing Forms 5471 for earlier years for statute purposes, which is why the 6501(c)(8) review above matters.

Can UK capital gains tax offset the US tax on the sale?

UK CGT paid on the disposal is generally creditable against US tax on the same gain through Form 1116, and the IRS explains the credit at https://www.irs.gov/individuals/international-taxpayers/foreign-tax-credit. Two technical points decide how well it works.

First, sourcing. Gain on the sale of personal property by a US citizen is normally US source, which would leave no foreign tax credit limitation to absorb the UK tax. Section 865(g) treats a citizen without a US tax home as a non-resident for this purpose, but only if a foreign income tax of at least 10% of the gain is actually paid. BADR at 10%, 14% or 18% meets that floor, so a UK-resident seller paying CGT under BADR generally has foreign-source gain. The treaty's relief article is a further backstop.

Second, timing and category. UK CGT is due under Self Assessment by 31 January after the end of the UK tax year, which may fall in a different US year from the sale. The credit is available for the year the tax accrues, so you do not lose it, but the return has to be prepared on the right basis. And where Section 1248 splits the US gain into a dividend and a capital gain, the UK tax has to be allocated between them, which can leave excess credit in one category and a shortfall in another.

What rate of BADR did you actually pay?

Business Asset Disposal Relief is the UK relief that reduces the CGT rate on qualifying business disposals. According to https://www.gov.uk/business-asset-disposal-relief, the rate is 10% for disposals on or before 5 April 2025, 14% for disposals between 6 April 2025 and 5 April 2026, and 18% for disposals from 6 April 2026. For a share sale you must be an employee or office holder of a trading company and hold at least 5% of the shares and voting rights for two years before the sale. The lifetime limit is £1 million of gains, set out at https://www.gov.uk/business-asset-disposal-relief/how-to-claim, and a 2025 to 2026 disposal must be claimed by 31 January 2028.

Gains above the lifetime limit are taxed at the ordinary UK CGT rates. The rising BADR rate matters for the US side: the higher the UK tax, the more foreign tax credit is available, and at 18% the UK tax on a BADR gain moves closer to the US federal rate on long-term gains, reducing residual US regular tax.

Does UK tax cover the 3.8% Net Investment Income Tax?

The Net Investment Income Tax is a 3.8% federal tax on net investment income above set income thresholds, and gain on the sale of shares in a corporation, including any Section 1248 dividend, generally falls within it. The IRS position, explained at https://www.irs.gov/individuals/net-investment-income-tax, is that the foreign tax credit reduces regular income tax only and does not offset the NIIT. Some taxpayers have argued that the relief article of the US-UK treaty provides a credit against it, and treaty positions on NIIT have been litigated, but a treaty-based return position must be disclosed and should be taken only with a clear view of the risk. In most exit returns we prepare, the NIIT is the largest residual US amount.

Worked scenario: a founder's share sale caught up through SFOP

This is an illustration only, with assumed figures and assumed exchange rates, not a real client. Maya is a US citizen who has lived in London since 2010. In 2012 she subscribed £1,000 for all the shares of a UK trading company, at an assumed rate of $1.58 to the pound, giving a US basis of $1,580. In July 2025 she sold the whole company for £3,000,000 in cash, at an assumed rate of $1.35, so the amount realised is $4,050,000 and the US gain is $4,048,420.

On the UK side, the first £1 million of her gain qualified for BADR at 14%, the rate for that tax year, with the balance taxed at the ordinary higher CGT rate. We assume her total UK CGT is £620,000, or $837,000 at the assumed rate. She has never filed a US return or Form 5471. The company was a CFC throughout, and we assume accumulated earnings and profits, computed in US terms and never included under section 951, of $1,300,000.

Streamlined years: 2023, 2024 and 2025, the three most recent years whose due dates have passed as of late 2026, each with Forms 5471, plus FBARs for the six most recent years.
Section 1248: $1,300,000 of the gain is treated as a dividend, assumed to qualify for the qualified dividend rate; the remaining $2,748,420 is long-term capital gain.
US regular tax before credits, at an assumed 20% on both parts: roughly $809,684.
Foreign tax credit: the UK CGT of $837,000, allocated across the dividend and gain, is enough in this illustration to eliminate the US regular tax on the sale, subject to the Form 1116 limitation, with a modest excess potentially carried forward.
NIIT: 3.8% of $4,048,420 is about $153,840, which the UK tax does not offset under the IRS position.
Penalties: none under SFOP if her Form 14653 certification of non-willfulness is accurate, together with interest only on any tax due on the earlier years.

The takeaway from the illustration is typical: the UK tax largely neutralises the US regular tax, and the real bill is the NIIT plus the cost of reconstructing thirteen years of company earnings and profits for the Section 1248 calculation.

Earn-outs and deferred consideration

Many UK exits include an earn-out or deferred payments. For UK purposes, the right to an unascertainable earn-out is often valued and taxed at completion, with a further disposal when payments arrive. The US typically treats contingent consideration under the installment method or open transaction principles, with a portion potentially recharacterised as interest. The mismatch means UK tax and US income can land in different years, which is manageable with foreign tax credit carryovers but must be tracked from the first streamlined return. If payments continue after the submission, each future year needs a return on time, and if you remain a 10% shareholder of a successor company, Form 5471 may continue too.

Does the 5% penalty apply to the value of my business?

A common misunderstanding: the Streamlined Foreign Offshore Procedures carry no penalty at all. The 5% miscellaneous offshore penalty belongs to the Streamlined Domestic Offshore Procedures, used by taxpayers who fail the non-residency test. According to https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-in-the-united-states, that penalty is 5% of the highest aggregate year-end balance or value of foreign financial assets that should have been reported on an FBAR or Form 8938, and the base expressly includes foreign stock or securities not held in a financial account.

For a founder, this is significant. If you spent too much time in the United States to meet the 330-day test and had to use the domestic route, the shares of your own UK company, as foreign stock reportable on Form 8938, could fall into the penalty base for years before the sale, alongside the UK accounts holding the proceeds afterwards. That is a strong reason to check the non-residency test carefully for each year before choosing a route.

When is SFOP not the right route after a business sale?

The streamlined procedures rely on a truthful certification of non-willfulness. A large exit changes the facts the IRS will read: the sale agreement, completion statements and due diligence often contain US tax warranties, questions about the seller's US status, or advisers' notes. If there is evidence you knew about the US filing obligation and chose not to file, or if the certification cannot honestly be signed, a streamlined submission creates risk rather than removing it.

In those cases the IRS Criminal Investigation Voluntary Disclosure Practice is the route designed for willful conduct, with penalties that are materially higher than the streamlined procedures but with a path to resolution. Where only the information returns are missing and all income was reported, the delinquent international information return submission procedures may apply instead. For the FBAR side of an exit, including accounts kept after completion, see our related guide, Missed FBAR: Accounts Kept After Selling Your UK Business; late FBARs are filed through FinCEN's BSA E-Filing System at https://bsaefiling.fincen.treas.gov.

What records do you need to catch up a UK business sale?

Companies House filings and statutory accounts for every year of ownership, to build US earnings and profits and the Form 5471 financial schedules.
Corporation tax computations and CT600 returns, to evidence UK corporation tax for the high-tax exclusion and credit calculations.
The share purchase agreement, completion statement and any earn-out schedule, to fix the amount realised and timing.
Your SA100 and CGT computation, BADR claim and proof of payment of UK tax, to support Form 1116.
Director loan account ledgers, payroll and dividend records, for the related-party schedules.
Year-end balances for every UK account and investment for the six-year FBAR period.

The founder's own share register and the date of the original subscription are the items most often missing. Companies House records usually fill the gap, and the incorporation-date exchange rate can be sourced from the published historical rates the IRS accepts.

The bottom line for founders

Selling a UK business does not make an unfiled US history worse by itself, but it concentrates the exposure into one very visible year. The Streamlined Foreign Offshore Procedures remain the cleanest way back for non-willful founders living in the UK, provided the three-year window, the Forms 5471, the Section 1248 calculation, the foreign tax credit sourcing and the NIIT are handled together rather than as an afterthought to the FBARs. In the returns we prepare, starting with the company's earnings history rather than the proceeds is what keeps the submission accurate and defensible.