Streamlined Domestic Offshore Procedure: UK Ltd Form 5471

A returned American founder who still owns a UK limited company can use the Streamlined Domestic Offshore Procedure to file three amended 1040-X returns with the missing Form 5471s attached, six years of FBARs, a Form 14654 certification and a 5% penalty. The company's bank accounts usually enter that penalty base, and the shares can too.

That is the short answer. The detail is where the money is. A founder's UK company is rarely just a bank account: it holds retained profits, it may have paid you a salary and dividends, it probably generated tested income every year you owned it, and it may have earned interest that the US treats as Subpart F income. Each of those has to be worked out correctly on the amended returns, and the choice of what goes into the 5% penalty base can swing the cost of the disclosure by tens or hundreds of thousands of dollars. This guide, prepared by the cross-border compliance team at Jungle Tax, walks through the package line by line for a US-resident founder who came back from London and never filed Form 5471 or an FBAR.

Who this guide is for

The fact pattern is common among founders, senior executives and partners who built something in London and then came home:

• You are a US citizen or green card holder and you now live in the United States.
• You formed a UK private limited company (Ltd) while living in the UK, typically as sole or majority shareholder and director.
• You filed US returns each year, often with the foreign earned income exclusion or foreign tax credits on your salary, but nobody prepared Form 5471, Form 8992 or FBARs for the company or its accounts.
• The company still exists. It may be trading, dormant with a cash balance, or holding investments you plan to extract.

If you never filed US returns at all for the recent years, the analysis changes, because the domestic procedure only accepts amended returns. If that is you, start with our wider streamlined filing service page before reading further.

Is the Streamlined Domestic Offshore Procedure the right route for a UK company owner?

Before building an SDOP package, test three gateways. Getting any of them wrong is far more expensive than any form-level error.

Gateway 1: could you qualify for the foreign procedure instead?

The Streamlined Foreign Offshore Procedure carries no 5% penalty at all. A US citizen qualifies if, in at least one of the most recent three tax years whose due date has passed, they had no US abode and were physically outside the United States for at least 330 full days. A founder who moved back in, say, mid-2024 may well satisfy that test for 2023. If so, the foreign procedure is almost always the better answer, even though you now live in the US. This is the single most valuable check in a returned-founder case and it is routinely missed.

Gateway 2: was there actually unreported income or unpaid tax?

The streamlined procedures exist for taxpayers who failed to report income from foreign financial assets and pay the related tax. For a CFC owner, the usual underreported items are the GILTI inclusion, any Subpart F income, and occasionally interest on personal UK accounts. If, after doing the computation, your company's high UK tax rate means there was no US tax underpayment at all, the delinquent international information return and delinquent FBAR submission routes, with a reasonable cause statement, may avoid the 5% penalty entirely. That is a judgement made on numbers, not instinct.

Gateway 3: can you honestly certify non-willfulness?

You sign Form 14654 under penalties of perjury stating that the failures resulted from negligence, inadvertence, mistake or a good-faith misunderstanding of the law. A founder who was told by a US preparer that Form 5471 was required and chose not to file is in a different position from one whose UK accountant never mentioned it. Where willfulness is arguable, the IRS Criminal Investigation voluntary disclosure practice may be the correct forum, and that decision must be taken before anything is filed.

What the SDOP package must contain

The IRS sets out the requirements on its US taxpayers residing in the United States page. For a UK company owner, the package looks like this:

• Form 1040-X for each of the three most recent tax years whose due date (or properly extended due date) has passed. For a submission made in late 2026, that is generally 2023, 2024 and 2025.
• A complete Form 5471 for each of those years, attached to the corresponding 1040-X, with every required schedule. Form 8992 (GILTI) is attached where there is tested income, and Form 8993 where a section 962 election claims the deduction.
• Form 8938 for each year in which your specified foreign financial assets exceeded the reporting threshold.
• Form 14654, signed in original, with a narrative non-willfulness statement and the penalty computation. Copies attach to each amended return and information return.
• Six years of FBARs filed electronically through the FinCEN BSA E-Filing System, citing "Streamlined Filing Compliance Procedures" as the late-filing reason. For a late-2026 filing that typically means 2020 to 2025.
• Payment of all tax, statutory interest and the miscellaneous offshore penalty.
• Each amended return and information return marked "Streamlined Domestic Offshore" in red at the top of the first page, and the whole package posted on paper to the IRS in Austin.

Two points catch founders out. First, the procedure accepts only amended returns, so if a year was never filed, a different route applies. Second, filing Form 5471 for only the three SDOP years does not by itself clean up earlier years: under section 6501(c)(8) the assessment period for a return stays open, at least as to the related items, until three years after the missing 5471 is supplied. The streamlined penalty protection covers the years in the submission; earlier years with material exposure, such as a 2017 section 965 transition tax inclusion, need a deliberate decision.

Which Form 5471 categories does a returned founder file?

Form 5471 is not one form but a set of schedules triggered by filer categories. The current form and instructions are on the IRS About Form 5471 page. A sole or majority founder of a UK Ltd will usually be:

• Category 4: a US person who controlled the foreign corporation (more than 50% of vote or value) during the year.
• Category 5: a US shareholder (10% or more) of a controlled foreign corporation who owned the shares on the last day of the CFC's year. Founders generally fall within Category 5a, the direct-owner subcategory.
• Category 2 or 3 only in the year shares were acquired or an officer or director relationship changed; for a company you formed yourself, Category 3 commonly applies in the year of incorporation, which is usually outside the three-year window.

For a Category 4 and 5 filer, expect to complete the identifying information page and Schedules A, B, C (income statement), E (foreign taxes), F (balance sheet), G (other information), H (current earnings and profits), I-1 (GILTI tested income information), J (accumulated E&P), M (transactions with you, including salary, dividends and director's loan movements), P (previously taxed E&P) and Q (CFC income by category), plus Schedule R where distributions were paid. Every figure must be translated from UK GAAP or FRS 102 accounts into US tax principles, in US dollars, with documented exchange rates. Our separate Form 5471 categories and penalties reference covers the schedules in more depth.

How are GILTI and Subpart F handled on the amended returns?

This is where an SDOP for a company owner differs fundamentally from one for a UK pension or ISA. The amended returns do not simply add omitted interest. They recompute what the US says you should have included from the company every year.

The GILTI (tested income) inclusion

For tax years 2018 to 2025, a US shareholder of a CFC includes a pro rata share of the company's net tested income under section 951A, computed on Schedule I-1 and Form 8992. For an individual who does nothing else, three facts make this painful:

• The inclusion is taxed at ordinary individual rates, up to 37%, plus potentially the 3.8% net investment income tax.
• Individuals do not receive the deemed-paid foreign tax credit for UK corporation tax that a US corporate shareholder would.
• The 50% section 250 deduction is not available to an individual unless a section 962 election is made.

A service company with modest fixed assets has little qualified business asset investment to shelter tested income, so most of the profit flows through. On paper, a founder can owe US tax on profits that already bore 19% or 25% UK corporation tax and were never distributed.

The high-tax exclusion and the timing trap

The GILTI high-tax exclusion removes a tested unit's income where its effective foreign rate, measured under US tax principles, exceeds 90% of the US corporate rate: 18.9%. UK corporation tax has been 25% at the main rate since April 2023, with a 19% small profits rate and marginal relief in between, so many UK companies qualify. Two cautions apply:

• The test uses US-measured income, not UK taxable profit. Capital allowances and full expensing in the UK can push the effective rate on US-measured income below 18.9% even where the headline UK rate is 19% or higher.
• The election can be made on an amended return only within 24 months of the unextended due date of the original return. For a submission in late 2026, the 2023 window (due date 15 April 2024) has generally closed, while 2024 and 2025 remain open. The earliest SDOP year may therefore need a different solution.

The section 962 election

A section 962 election lets an individual be taxed on the inclusion as if a domestic corporation: at 21%, with the section 250 deduction and an 80% deemed-paid credit for UK corporation tax. For a company paying 25% UK tax, that frequently eliminates the US charge on the inclusion. The trade-off is that a later actual dividend is taxed again to the extent it exceeds the US tax already paid, with qualified dividend rates potentially available under the US-UK treaty. Current regulations allow the election to be made with an amended return in many cases, which makes it the usual fix for a year where the high-tax window has closed. It must be modelled against the founder's extraction plans, not elected by default.

Subpart F: the founder's cash pile

A UK company sitting on retained profits often earns deposit interest or holds a portfolio. That is foreign personal holding company income under Subpart F, included currently under section 951 regardless of distribution. Relief exists through the de minimis rule (gross Subpart F income below the lesser of 5% of gross income or $1 million) and the Subpart F high-tax exception, which is a separate election from the GILTI exclusion. A dormant company with a large deposit and no trade is, in US terms, largely a Subpart F vehicle, and that frequently produces a real tax underpayment on the amended returns.

What changes from 2026: GILTI becomes NCTI

The 2025 reconciliation act renamed GILTI as net CFC tested income for tax years beginning after 31 December 2025, removed the QBAI return, reduced the section 250 deduction to 40% and raised the deemed-paid credit to 90%. Those rules do not apply to the 2023 to 2025 amended returns in a typical late-2026 SDOP, but they govern the 2026 return you file next, which is where ongoing compliance begins.

Do the UK company's shares and bank accounts enter the 5% penalty base?

The miscellaneous offshore penalty is 5% of the highest aggregate year-end balance or value of the foreign financial assets subject to the penalty, across the three tax years and six FBAR years. An asset is in the base for an FBAR year if it should have been on an FBAR and was not, and for a tax year if it should have been on Form 8938 and was not, or was reported but its income was not. For a founder, that produces three distinct questions.

The company's bank accounts

FBAR rules treat a US person as having a financial interest in accounts owned by a corporation in which they hold more than 50% of the vote or value. A majority founder therefore had a reportable financial interest in the company's UK accounts, not merely signature authority. Those accounts belong in the penalty base for every FBAR year they were unreported, at their year-end balance. The IRS position that pure signature authority, such as over an employer's account, is not penalised helps minority shareholder-directors, not majority owners.

The shares themselves

Stock in a foreign corporation not held through a financial account is a specified foreign financial asset for Form 8938. The Form 8938 instructions relieve duplicate reporting where the interest is reported on a timely Form 5471, but where no 5471 was filed, the shares should arguably have appeared on Form 8938 if your thresholds were met, which pulls their value into the base for the three tax years. For a trading company valued at several million pounds, the difference between including and excluding the shares can dwarf every other element of the submission.

Avoiding double counting

If both the shares and the company's accounts are included, the same cash is counted twice: once as the balance in the account and again as part of the share value. A defensible computation chooses a methodology, documents it, and applies it consistently across years, typically either looking through to the underlying accounts or valuing the shares net of cash already in the base. Assets that were never FBAR- or Form 8938-reportable, and accounts that were properly reported with their income, stay out entirely. This is the most contestable area of a company-owner SDOP and should be computed with workpapers you would be comfortable producing if the IRS asked.

US and UK obligations compared

Issue	United States (IRS)	United Kingdom (HMRC / Companies House)
Company residence	Foreign corporation; a CFC once US shareholders own more than 50%	UK resident by incorporation, wherever you now live
Annual company reporting	Form 5471 with your 1040, plus Form 8992 for tested income	CT600 to HMRC; statutory accounts and confirmation statement at Companies House
Tax on undistributed profit	GILTI (NCTI from 2026) and Subpart F inclusions to the shareholder	Corporation tax at 19% to 25% at company level only
Dividends to you	Taxable; previously taxed E&P is excluded; qualified rates may apply under the treaty	No UK withholding on dividends; non-resident liability generally limited, subject to temporary non-residence rules
Account reporting	FBAR above $10,000 aggregate; Form 8938 above thresholds	No equivalent personal account report
Missed-filing penalty	$10,000 per Form 5471 per year, plus continuation penalties; FBAR penalties per report	Late filing penalties for CT600 and Companies House accounts
Catch-up route	Streamlined domestic or foreign procedure, or delinquent submission procedures	Late filing with HMRC and Companies House; disclosure facilities where UK tax is unpaid

What about the UK side after you left?

Leaving the UK does not end the company's UK life. A UK-incorporated company remains UK tax resident and must keep filing its corporation tax return, statutory accounts and confirmation statement. If those lapsed after you moved, bring them current first: the US Form 5471 is built from the UK accounts, and an IRS reviewer will expect them to reconcile.

Personally, your UK residence position for the years around the move is decided under the statutory residence test set out in HMRC's RDR3 guidance. It matters for two reasons. It determines whether the split-year treatment applied to your year of departure, and it determines whether the temporary non-residence rules can bite. Broadly, if you were UK resident for at least four of the seven years before leaving and you return to the UK within five years, certain dividends from a close company paid while you were away, out of profits accrued while you were UK resident, can be taxed in the UK on your return. Founders who extract retained profits shortly after moving to the US should know that before paying a large dividend.

For US purposes, UK corporation tax paid by the company is relevant only through the high-tax exclusion or a section 962 election; UK income tax you paid personally on salary and dividends while resident in the UK is relevant to your own foreign tax credit position on the amended returns, and those credits must be re-run alongside the new inclusions.

A worked illustration

Consider a US citizen who ran a London consultancy through a wholly owned Ltd, moved to New York in July 2024, and has never filed Form 5471 or an FBAR. The company has retained profits of roughly $1.4 million held in a UK business account, earns deposit interest, and continues to invoice a handful of UK clients.

• Route: she was physically outside the US for all of 2023 with no US abode. The foreign procedure is available and avoids the 5% penalty, so SDOP is not the right answer for her. Had she moved back in 2022, SDOP would apply.
• Inclusions: trading profit taxed at 25% in the UK is likely excluded under the high-tax exclusion for 2024 and 2025; for 2023, with the exclusion window closed, a section 962 election is modelled. The deposit interest is Subpart F income unless the de minimis or high-tax exception applies.
• Penalty base (had SDOP applied): the business account balance at each year end is included, as is any personal UK account; the shares are valued on a look-through basis to avoid counting the same cash twice; the highest single year sets the 5%.
• UK: CT600 and accounts confirmed current; temporary non-residence flagged before any large dividend.

The illustration is deliberately simplified. Real cases turn on exchange rates, the US earnings and profits computation, prior foreign tax credit carryovers and state conformity, which varies sharply between, for example, New York and California.

Common errors in founder SDOP packages

• Filing SDOP when the foreign procedure was available.
• Attaching a skeletal Form 5471 without Schedules I-1, J, M or P, which invites rejection or later penalties.
• Ignoring Subpart F on a cash-rich dormant company.
• Claiming the high-tax exclusion for a year whose amended-return window has closed.
• Double counting company cash and share value in the penalty base, or omitting the company accounts altogether.
• Forgetting state amended returns, which most states require once federal income changes.
• Filing the 2026 return on the old GILTI rules rather than NCTI.

How we prepare these submissions

We prepare the complete package: UK accounts reconciled to US tax principles, every Form 5471 schedule, Forms 8992 and 8993, Form 8938, six FBARs, the 1040-X returns, the penalty computation with workpapers, and the Form 14654 narrative. We also confirm the UK company's own filings are current so that both sides of the record agree. For founders with wider cross-border reporting, our US-UK tax accountants and high-net-worth compliance team handle the ongoing annual returns once the catch-up is filed. You can estimate the stakes on the FBAR side with our FBAR penalty calculator.

If you have returned from London still owning a UK limited company and the US filings were never made, the order of decisions matters more than the speed of filing. Contact our cross-border team for a confidential consultation: we will confirm which procedure you qualify for, quantify the inclusions and the penalty base, and prepare a submission that closes the matter cleanly on both sides of the Atlantic.