Does a missed Form 5471 keep my whole US tax return open to audit?

Ordinarily yes. IRC section 6501(c)(8) suspends the assessment period for the income tax return until the required information is furnished to the IRS, and the period does not expire before three years after that date. Without a reasonable cause showing the suspension reaches every item on the return, not just the foreign corporation. Where the failure was due to reasonable cause and not willful neglect, the extended period is confined to the items related to the reporting failure. That narrowing is a strong reason to document reasonable cause even where you do not expect a penalty.

Does my UK company still need a Form 5471 if it was dormant or made no profit?

Yes. The section 6038 penalty is imposed for failing to furnish the required information, not for failing to pay tax, so a dormant UK limited company with no trade and no profit still generates a filing obligation for a Category 4 or Category 5 filer and still generates a USD 10,000 exposure per accounting period if the form is missed. The fact that the company delivered abridged or dormant accounts to Companies House showing almost nothing is not a defence in itself, though it is often useful evidence in a reasonable cause statement because it explains why the owner believed there was nothing to report.

Does blaming my UK accountant work as a reasonable cause argument?

Not in that form. The Internal Revenue Manual directs that reasonable cause should not be granted merely because the taxpayer relied on another person to file, and in United States v. Boyle the Supreme Court held that the duty to file on time is nondelegable. The argument that does work is different: that you disclosed the UK company and its records to a US preparer who reached a substantive conclusion that no Form 5471 was required. That is reliance on professional judgment about the existence of an obligation rather than delegation of the filing task, and it needs the engagement letter, the intake questionnaire and the adviser correspondence to support it.

Form 5471 Penalties: Reasonable Cause Relief Guide

Q: What is the penalty for not filing Form 5471?

The Instructions for Form 5471 on IRS.gov impose a USD 10,000 penalty under IRC section 6038(b)(1) for each annual accounting period of each foreign corporation for which the required information was not furnished on time. If the information is still not filed within 90 days after the IRS mails a notice of the failure, an additional USD 10,000 applies for each 30-day period, or fraction thereof, capped at USD 50,000 for each failure. The ceiling for one UK company for one accounting period is therefore USD 60,000, and the initial penalty applies whether or not any US tax was due.

Q: Can Form 5471 penalties be abated for reasonable cause?

Yes. IRC section 6038 withholds the penalty where the failure was due to reasonable cause and not to willful neglect. In practice you must submit a written statement setting out the facts, supported by documents, and containing a declaration that it is made under the penalties of perjury, as the Internal Revenue Manual requires for abatement requests. The standard applied is whether you exercised ordinary business care and prudence. Abatement is not automatic, and IRS.gov warns that penalties may be assessed during processing without the attached reasonable cause statement being considered, so expect to argue the point after assessment.

Q: Should I use the Streamlined Foreign Offshore Procedures or DIIRSP to fix missed years?

Streamlined Foreign Offshore is normally the stronger route for a US person genuinely resident in the UK. It requires no US abode and at least 330 full days outside the United States, a non-willful certification on Form 14653, three years of returns and six years of FBARs, and IRS.gov states that eligible taxpayers will not be subject to failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties. DIIRSP suits taxpayers whose tax does not change and who only need to file missing forms, but IRS.gov warns that penalties may still be assessed during processing. Neither route is open once the IRS has contacted you or opened an examination.

Form 5471 penalties begin at USD 10,000 for each annual accounting period of each foreign corporation you failed to report, and the Instructions for Form 5471 on IRS.gov confirm that figure applies whether or not a single dollar of US tax was owed. For a US citizen or green card holder who owns a UK limited company, that penalty multiplies by company and by year, and it is frequently assessed automatically when a late return carrying the form is processed. The one durable answer is reasonable cause. IRC section 6038 withholds the penalty where the failure was due to reasonable cause and not to willful neglect, and the reasonable cause carve-out also narrows the extended statute of limitations that an unfiled information return otherwise opens across your entire return. What follows is the complete penalty architecture, the collateral consequences most UK company owners never see coming, and a practitioner method for building a reasonable cause statement that survives contact with an IRS penalty unit.

What Is the Penalty for Not Filing Form 5471?

Form 5471 is an information return, not a tax return. It is the Information Return of US Persons With Respect To Certain Foreign Corporations, and it attaches to your federal income tax return. The IRS.gov guidance is explicit that you attach the form to your income tax return and file both by the due date for that return, including extensions. A US person living in the UK who takes the automatic extension available to taxpayers abroad and then extends again to October still has a hard Form 5471 deadline on that extended date. Miss it, and the failure is complete.

The penalty sits in IRC section 6038(b)(1). The Instructions for Form 5471 state that a USD 10,000 penalty is imposed for each annual accounting period of each foreign corporation for failure to furnish the information required by section 6038(a) within the time prescribed. Read that unit of measurement carefully, because it is where the arithmetic turns punitive. The unit is not the taxpayer and it is not the tax year. It is the company, multiplied by the company's own annual accounting period. An investment banker who holds a UK consultancy company, a UK property holding company and a UK intellectual property company has three separate exposures for every single year missed.

A substantially incomplete form is treated no differently from no form at all. If the schedules that carry the substantive data are missing, blank or plainly inconsistent with the company's own accounts, the IRS position is that the information required by section 6038(a) was not furnished. Practitioners see this most often where a UK accountant has supplied statutory accounts prepared under FRS 102 or FRS 105 and nobody converted them to US generally accepted accounting principles or functional currency before the schedules were completed.

The initial section 6038(b)(1) penalty of USD 10,000 per foreign corporation per annual accounting period, imposed regardless of profit, distribution or US tax due
A continuation penalty that begins only after the IRS mails a notice of the failure and a 90-day period expires
A separate section 6046 reporting failure penalty, collected under section 6679, for Category 2 and Category 3 filers who fail to report acquisitions, dispositions and organisational events, again USD 10,000 per reportable transaction
A reduction of the foreign tax credit under section 6038(c), which is a cash cost quite separate from the penalty itself
An extended assessment period under section 6501(c)(8) that can leave the whole return open indefinitely
Criminal exposure under sections 7203, 7206 and 7207, which the Instructions for Form 5471 expressly reserve for failures to file the information required by sections 6038 and 6046

How the Continuation Penalty Escalates After an IRS Notice

The initial penalty is not the ceiling. The Instructions for Form 5471 provide that if the information is not filed within 90 days after the IRS has mailed a notice of the failure, an additional USD 10,000 penalty per foreign corporation is charged for each 30-day period, or fraction thereof, during which the failure continues after the 90-day period has expired. That additional penalty is limited to a maximum of USD 50,000 for each failure. Combine the two layers and the statutory ceiling for one company for one accounting period is USD 60,000.

Two features of that mechanism matter in practice. The first is that the continuation penalty only starts running once the IRS has actually mailed a notice of the failure. Many UK company owners discover their exposure through their own adviser rather than through an IRS letter, which means the continuation clock has never started and the whole of the USD 50,000 upper layer remains theoretical. That is a powerful reason to remediate before the IRS writes to you rather than after. The second is the phrase fraction thereof. A delay of thirty-one days after the 90-day window closes is charged as two 30-day periods, not one and a fraction.

The parallel penalty under sections 6046 and 6679 is routinely overlooked. It applies to reportable events rather than to annual reporting, so it catches the director who was appointed to a UK company board, the shareholder who acquired an additional tranche of shares crossing a threshold, and the owner who sold out entirely. The Instructions for Form 5471 set that penalty at USD 10,000 for each such failure for each reportable transaction, with the same 30-day continuation mechanism and the same USD 50,000 cap. A share reorganisation at a UK limited company can therefore generate its own penalty stack independent of the annual filing.

The Foreign Tax Credit Reduction Nobody Budgets For

IRC section 6038(c) imposes a second, quieter sanction. The Instructions for Form 5471 state that any person who fails to file or report all of the information required within the time prescribed will be subject to a reduction of 10 percent of the foreign taxes available for credit under sections 901 and 960. If the failure continues 90 days or more after the date the IRS mails notice of the failure, an additional 5 percent reduction is made for each 3-month period, or fraction thereof, during which the failure continues after the 90-day period has expired.

For a UK company owner this is not academic. UK corporation tax paid by the company is exactly the sort of foreign tax that flows through to a US shareholder as a deemed paid credit on a subpart F or global intangible low-taxed income inclusion, and the credits claimed under sections 901 and 960 are frequently the only thing standing between a UK-resident owner and genuine double taxation. Shaving 10 percent off that credit converts an information reporting failure into a real US tax liability.

There is a ceiling. Section 6038(c)(2) provides that the reduction shall not exceed the greater of USD 10,000 or the income of the foreign business entity for its annual accounting period. For a small UK consultancy company with modest profits the credit reduction is therefore contained. For a substantial UK trading company it is not, and the credit reduction can comfortably exceed the headline penalty. There is also a reasonable cause route out of it: section 6038(c)(4)(B) treats the time for furnishing the information as being not earlier than the last day on which reasonable cause existed for the failure. In other words, the same evidence that defeats the penalty also protects the credit.

Why One Missing Form 5471 Keeps Your Entire Return Open

The most expensive consequence of an unfiled Form 5471 is usually not the penalty at all. IRC section 6501(c)(8) suspends the period of limitations on assessment for the income tax return to which the information return relates. The period does not begin to close until the required information is furnished to the IRS, and once it is furnished the period does not expire before three years after that date. A return filed in 2016 with a missing Form 5471 is, in the ordinary case, still open today.

That matters far beyond the foreign corporation. Absent a reasonable cause showing, the suspension applies to the whole return, so an IRS examiner is not confined to the UK company. Carried interest allocations, equity compensation from a US employer, portfolio disposals, residence positions taken under the US-UK income tax treaty and the foreign earned income exclusion are all sitting inside a return that has never closed. For a high-net-worth filer with complex US and UK income, an indefinitely open return is a materially worse outcome than a USD 10,000 assessment.

This is where reasonable cause earns its keep twice over. Where the failure to furnish the information is due to reasonable cause and not to willful neglect, the extended assessment period is confined to the items related to the reporting failure rather than applying to every line of the return. That narrowing is worth documenting even in cases where you expect no penalty to be assessed at all. It is the single most under-appreciated reason to build a proper contemporaneous file rather than to file the delinquent forms silently and hope.

How Does the IRS Actually Assess Form 5471 Penalties?

Many owners assume a human being reviews the circumstances before a penalty is charged. Frequently no human does. The Internal Revenue Manual at IRM 20.1.9, which governs international penalties, describes penalties that are systemically assessed when a Form 5471 is attached to a late-filed Form 1120 or Form 1065, using dedicated penalty reference numbers. The trigger is the lateness of the return the form rides on, not an examiner's judgment about your conduct. The assessment is generated, the notice is issued, and only then does anyone look at your explanation.

The IRS says this openly in the context of remediation. The Delinquent International Information Return Submission Procedures page on IRS.gov warns that during the processing of the delinquent information return, penalties may be assessed without considering the attached reasonable cause statement. That single sentence reframes the entire exercise. You are not writing a statement to prevent an assessment. You are writing a statement that will be read after an assessment, by an officer deciding whether to abate, and increasingly by an Appeals officer after that.

The notice itself will be a CP15 for an individual account or a CP215 for a business account. Both carry a short response window, and both carry appeal rights. IRM 20.1.9 records that Appeals provides a prepayment, post-assessment appeal process for international penalties, which is unusual and valuable. It means a UK-resident owner does not have to pay a six-figure assessment before contesting it, unlike many other penalty regimes where payment is a precondition to a refund claim.

Can Form 5471 Penalties Be Abated for Reasonable Cause?

Yes, and reasonable cause is the primary route. The statutory standard is that the penalty is not imposed where the failure was due to reasonable cause and not to willful neglect. The administrative standard applied by IRS penalty units is drawn from the Internal Revenue Manual: reasonable cause exists where the taxpayer exercised ordinary business care and prudence but nevertheless failed to comply. It is a facts and circumstances test, and it is decided on the paper you put in front of the reviewer.

Be clear-eyed about what the IRS has already ruled out. IRM 20.1.9 states that taxpayers conducting international transactions have a responsibility to exercise ordinary business care and prudence in determining their filing obligations, and it directs that reasonable cause should not be granted merely because a foreign country would penalise disclosure, because a foreign party refuses to provide the information, or because the taxpayer relied on another person to file the return. If your entire case is that your UK accountant did not mention Form 5471, you are arguing on ground the IRS has already conceded to itself.

The reliance argument is not dead, but it must be pleaded on the right footing. In United States v. Boyle the Supreme Court held that the duty to file a return on time is nondelegable, so simply handing the job to an agent who missed the deadline is not reasonable cause. The court drew a distinction that still governs these cases: relying on a professional to press the button is different from relying on a professional's substantive judgment about whether a filing obligation exists at all. Most UK company owners fall into the second category. They disclosed the UK company, its share register, its accounts and its dividends to a preparer who concluded, wrongly, that nothing further was required. That is an advice failure, not a delegation failure, and it should be framed as one.

Do not pin hopes on First-Time Abate. FTA is designed around the recurring failure-to-file and failure-to-pay penalties and does not reach event-based international information returns as a general matter. The Internal Revenue Manual contains a narrow carve-out under which FTA can reach systemically assessed Form 5471 penalties where the failure-to-file penalty on the related Form 1120 or Form 1065 is itself abated under the FTA provisions and the prior three-year compliance conditions are met. That carve-out is framed around business returns, so it rarely assists an individual whose Form 5471 is attached to a Form 1040. Reasonable cause remains the main road.

How Do You Build a Reasonable Cause Statement That Persuades the IRS?

A persuasive statement is a chronology with evidence attached, not an apology. The reviewer is asking one question: did this taxpayer act as an ordinarily careful and prudent person in their circumstances would have acted, and does the paper support it? Statements fail because they assert conclusions, plead ignorance of the law in the abstract, or run to two paragraphs when the facts needed twelve. They also fail when they cover one year while three other years remain unfiled, because IRM 20.1.9 directs that full compliance across all open periods should be established before reasonable cause is granted for any single year.

A precise identification block: the taxpayer, the taxpayer identification number, each tax year at issue, each UK company by name and Companies House registered number, and the filer category claimed for each
A dated chronology from incorporation of the UK company forward, recording when each US and UK adviser was engaged, what documents were given to them and what advice came back
The specific cause, stated as a fact rather than a conclusion, with the reason an ordinarily prudent person in the same position would not have identified the obligation
Evidence that the cause was genuine: engagement letters, scope-of-work schedules, adviser correspondence, questionnaires that never asked about foreign corporations, medical or bereavement records where relevant
The date and manner of discovery, and an explanation of any delay between discovery and remediation, because unexplained delay after discovery is fatal
The corrective action taken, including all years brought current in the same submission and the systems now in place to prevent recurrence
An express statement that the failure was not willful and that the entity was not engaged in tax evasion
The declaration required by IRM 20.1.9 that the request is made under the penalties of perjury, signed by the taxpayer rather than by the preparer

The perjury declaration is not a formality. An abatement request lacking it can be set aside without consideration, and a statement signed only by the agent invites the reviewer to treat it as advocacy rather than testimony. The taxpayer signs. Where two spouses filed jointly, both sign.

Length is a function of facts, not of ambition. A single missed year caused by a documented adviser error may need three pages. Eight years across three UK companies with a change of adviser midway will need considerably more, and it will need a separate statement attached to each delinquent Form 5471 rather than one global letter, because the penalty is assessed per company per period and each assessment is reviewed on its own file.

The UK-Specific Evidence That Makes or Breaks the Statement

This is the ground almost no published guidance covers, and it is where UK cases are won. UK company owners hold, or can obtain in an afternoon, an unusually strong contemporaneous record. Companies House holds the incorporation date, the registered office history, the appointment and resignation dates of every director, the confirmation statements, the allotments and transfers of shares on form SH01 and the full filing history with the exact date each document was delivered. That record is public, dated, third-party verified and effectively impossible to reconstruct after the fact. It is far better evidence of when you became a Category 2, 3, 4 or 5 filer than any assertion in a letter.

The UK accounting reference date is the second point. The section 6038 penalty is measured by the foreign corporation's annual accounting period, and a UK limited company commonly runs to 31 March or to the anniversary of incorporation rather than to 31 December. That mismatch with the US tax year is the origin of a large share of missed filings, and it is also how the penalty count is constructed. A statement that sets out the company's accounting reference date, the periods covered by each set of statutory accounts and the corresponding US tax years shows the reviewer that you understand the unit being penalised and stops the IRS counting periods that never existed.

The third point is the small and dormant company filing regime. A UK company that qualifies as small or dormant may deliver abridged or filleted accounts to Companies House containing little more than a balance sheet, with no profit and loss account and no directors' report. Many owners genuinely believed their company had nothing to report because the UK public record showed nothing to report. That is a specific, verifiable, sympathetic fact pattern, and it is materially more persuasive than a generic plea of ignorance. Attach the filed accounts and let the reviewer see the blank pages for themselves.

Finally, the scope of the UK engagement. UK accountants are engaged to prepare statutory accounts, file the CT600 corporation tax return with HMRC and run payroll. Their engagement letters normally say so, and normally exclude non-UK tax explicitly. If the US preparer's annual questionnaire never asked whether the client owned shares in a non-US company, that questionnaire is evidence. If the client told the US preparer about the UK company and was told it did not matter, the email in which they were told is the single most valuable document in the file.

Worked Example: A UK Ltd Owner With Four Unfiled Years

Consider Marcus Aldridge, a US citizen who has lived in London for eleven years and works in leveraged finance. In 2021 he incorporated Aldridge Strategic Ltd, a UK limited company through which he takes consultancy income, and he owns 100 percent of the ordinary shares. The company has a 31 March accounting reference date. His US returns were prepared each year by a US firm that specialises in expatriate individuals; he disclosed the company on the intake questionnaire in the first year, was told it was a UK matter, and the point was never revisited. No Form 5471 was ever filed. Four annual accounting periods have now passed.

As a Category 4 and Category 5 filer for a controlled foreign corporation, Marcus has four separate section 6038(b)(1) exposures of USD 10,000 each, or USD 40,000 before any notice has been issued. Because the IRS has not yet written to him, no continuation penalty has begun to run and the USD 50,000 upper layer per period remains unrealised. His accumulated UK corporation tax is also at risk: the section 6038(c) reduction would cut the foreign taxes available for credit under sections 901 and 960 by 10 percent, capped at the greater of USD 10,000 or the company's income for the period. And every one of his US returns since 2021 remains open under section 6501(c)(8), which is the exposure his lawyers care about most, because those years also contain a significant UK-source carried interest allocation.

Marcus has been physically outside the United States for the whole period and has no US abode, so he qualifies on the non-residency test for the Streamlined Foreign Offshore Procedures, and his conduct is plainly non-willful. That route is chosen. The submission carries amended returns for the three most recent years with a complete Form 5471 for each, six years of FBARs, and a Form 14653 certification whose narrative does the real work: it names the questionnaire, quotes the adviser's response, attaches the Companies House filing history showing the incorporation date and the accounting reference date, attaches the filed statutory accounts, and explains that discovery came in month one of the current year with remediation completed in month three. The reasonable cause chronology is written once and used twice, because the same facts support the Streamlined narrative and the section 6501(c)(8) argument that any residual open period should be confined to the UK company items.

Streamlined Foreign Offshore Procedures or DIIRSP?

These are the two published routes, and they are not interchangeable. The Streamlined Foreign Offshore Procedures require that the individual did not have a US abode and was physically outside the United States for at least 330 full days in the relevant year, and that the failures resulted from non-willful conduct, certified on Form 14653. The submission covers delinquent or amended returns for each of the most recent three years for which the due date has passed and delinquent FBARs for each of the most recent six years. The IRS.gov page states that eligible taxpayers will not be subject to failure-to-file and failure-to-pay penalties, accuracy-related penalties, information return penalties, or FBAR penalties. For a US person genuinely resident in the UK with unfiled Forms 5471, that is the cleanest available outcome.

The Delinquent International Information Return Submission Procedures are narrower in purpose and weaker in protection. They are for taxpayers who do not need to correct their income or tax and who simply have missing information returns. IRS.gov sets the eligibility conditions: the taxpayer must not be under civil examination or criminal investigation, and must not already have been contacted by the IRS about the delinquent information returns. Delinquent returns other than Forms 3520 and 3520-A are attached to an amended income tax return. Crucially, the same page warns that penalties may be assessed during processing without consideration of the attached reasonable cause statement, so DIIRSP is best understood as a structured way to file and then argue, not as a safe harbour.

The choice usually turns on three questions. Does the correction change your tax, or only your disclosure? Do you meet the physical presence and abode tests? And is your conduct defensible as non-willful on paper rather than merely in your own recollection? Where a UK company generated subpart F or global intangible low-taxed income inclusions that were never picked up, the correction changes tax and Streamlined is normally the right architecture. Where the company was dormant throughout and nothing changes but the disclosure, DIIRSP with a strong reasonable cause statement attached to each form is proportionate. Neither route is available once the IRS has opened an examination, which is the practical argument for moving now rather than waiting to see whether a notice arrives.

Where Does the Farhy Litigation Leave Section 6038(b) Penalties?

In 2023 the US Tax Court held in Farhy v. Commissioner that the IRS lacked statutory authority to assess section 6038(b) penalties, reasoning that Congress had not made them assessable penalties, so the government would have to sue to collect them. That decision generated a great deal of optimism and a number of protective refund claims. On 3 May 2024 the Court of Appeals for the District of Columbia Circuit reversed, holding that the text, structure and function of section 6038 show that Congress authorised assessment, and that the IRS may therefore assess and administratively collect these penalties.

The matter did not end there. The Tax Court has continued to apply its own reasoning in cases appealable outside the DC Circuit, including in Mukhi v. Commissioner, relying on the Golsen principle that it follows the law of the circuit to which an appeal would lie rather than treating one circuit's view as binding everywhere. In February 2026 the Court of Appeals for the Second Circuit decided Safdieh v. Commissioner and agreed with the DC Circuit that the IRS may collect section 6038(b) penalties by administrative assessment. Appeals raising the same question have been working through other circuits, and the Supreme Court has not resolved it. Treat any account of this litigation, including this one, as a snapshot rather than a settled rule, and check the current position before relying on it.

There is a venue point that applies specifically to UK-resident owners and that almost no published guidance mentions. IRC section 7482(b)(1) sends review of a Tax Court decision to the circuit of the individual petitioner's legal residence, and provides that if no subparagraph applies, review lies in the Court of Appeals for the District of Columbia. A US citizen whose legal residence is London has no US circuit of residence, so an appeal would ordinarily default to the DC Circuit, which is precisely the court that upheld the IRS position. A UK-resident owner is therefore in a structurally weaker position to run the assessment-authority argument than a taxpayer living in a circuit where the question is open. Build your case on reasonable cause and remediation, and treat the litigation as a possible bonus rather than as a plan.

What to Do If You Have Already Received a CP15 Notice

A CP15 or CP215 assessing a section 6038 penalty is a deadline document. The response window stated on the notice is short, and missing it does not extinguish every remedy but it forfeits the most efficient one, which is the prepayment appeal that IRM 20.1.9 records as available for international penalties. The instinct to telephone and explain is understandable and almost always wasted. These cases are decided on written submissions.

Diarise the response date on the notice immediately and calculate it from the notice date, not the date you opened the envelope in London
Verify the assessment before disputing it: confirm the penalty reference number, the tax period, the company and whether the underlying return was in fact late, because master file mismatches produce genuinely erroneous assessments
File any still-outstanding Forms 5471 for every open year before or with the response, since partial compliance undermines a reasonable cause claim
Submit the written reasonable cause statement with the perjury declaration and the full evidence bundle, requesting abatement and, in the alternative, referral to Appeals
If the window has passed or abatement is refused, consider paying the assessment and claiming a refund on Form 843, which preserves a route to the courts
Where the IRS moves to collection, collection due process rights attached to a lien or levy notice provide a further, and separately timed, opportunity to contest

One caution on protective steps. Filing a refund claim or an appeal does not pause the section 6501(c)(8) clock, and it does not substitute for filing the missing forms. The assessment period on the underlying return starts to close only when the required information is actually furnished to the IRS. Contesting the penalty while leaving the information return unfiled is the worst of both worlds.

Getting the Sequence Right

The order of operations decides the outcome more often than the quality of the prose. Establish the filer category and the number of annual accounting periods actually in issue first, because that fixes the maximum exposure and tells you whether you are arguing about USD 10,000 or USD 240,000. Assemble the UK evidence next, from Companies House and from the UK accountant, before anyone drafts a word, since the chronology must follow the documents rather than the documents being selected to fit a chronology. Choose the remediation route only once the tax consequences of the UK company have been computed, because whether there is additional US tax is the fact that separates Streamlined from DIIRSP.

Then file everything at once. A submission that brings every open year and every UK company current in a single package, with a signed reasonable cause statement attached to each delinquent Form 5471, an evidenced chronology and a clear account of the systems now in place, is a fundamentally different proposition from a trickle of late forms with a covering letter. It also does the quiet work of closing the section 6501(c)(8) window across the whole period rather than one year at a time.

We prepare and file these submissions for US persons who own UK limited companies, from the reconstruction of the company's accounts on a US basis through to the drafting and evidencing of the reasonable cause statement and, where necessary, the response to a CP15 and the referral to Appeals. If you own shares in a UK company and no Form 5471 has been filed, the exposure is fixed but it is not static, and it is considerably cheaper to resolve before an IRS notice starts the continuation clock than after.