Am I a Form 5471 Category 1 filer if I own a UK limited company?

Usually not. If you own a UK limited company outright you are a Category 4 filer, and you are also described in Category 5a. Category 1 applies only where the company was a section 965 specified foreign corporation and section 965 amounts remain in play. The instructions state that a Category 1 filer must continue to file as long as the corporation has accumulated earnings and profits related to section 965 reportable on Schedule J, or the filer has previously taxed earnings and profits related to section 965 reportable on Schedule P. If neither is true, leave the Category 1 boxes blank.

Do I check both the Category 4 and Category 5a boxes on Form 5471?

No. The current instructions state: "Note: If you satisfy the requirements of both Category 4 and Category 5a filers, only check the box for Category 4 and leave the box for Category 5a blank." You are still described in both categories and you still complete everything both require. The IRS example for a sole owner of a CFC calls for all six pages of Form 5471 and separate Schedules E, G-1, H, H-1, I-1, J, M, P, Q and R. Only the box changes, not the schedule set.

Does Category 1 apply if my UK company was incorporated after 2017?

No. Section 965 applies to the last taxable year of specified foreign corporations beginning before 1 January 2018. A UK company incorporated in 2018 or later cannot have had a section 965 inclusion year, so there can be no section 965 earnings and profits on Schedule J and no section 965 previously taxed earnings and profits on Schedule P. Your categories will be Category 4, and Category 5a will be described but not ticked, plus Category 3 in the year you first crossed the ownership threshold.

Which schedules does a Category 1a filer have to complete?

Under the Filing Requirements for Categories of Filers chart in the December 2025 instructions, a Category 1a filer completes the identifying information on page 1 of Form 5471 above Schedule A, Schedule B Part II, separate Schedule E, Schedule E-1 which is included with separate Schedule E, separate Schedule J and separate Schedule P. That is considerably less than a Category 4 filer, who completes the full form and most separate schedules. Where a required schedule has only zero amounts, file it showing zero amounts rather than omitting it.

What happens if I never filed Form 5471 for the section 965 year?

The section 6038 penalty is $10,000 for each annual accounting period of each foreign corporation, with an additional $10,000 for each 30-day period after 90 days from an IRS notice, limited to $50,000 for each failure, plus a 10 per cent reduction in foreign taxes available for credit under sections 901 and 960. The practical route depends on your facts. The Streamlined Foreign Offshore Procedures state that eligible taxpayers will not be subject to information return penalties. The Delinquent International Information Return Submission Procedures allow a reasonable cause statement, but the IRS states that penalties may be assessed in accordance with existing procedures.

Can a UK company that is not a CFC still create a Category 1 filing?

Yes, in principle. A section 965 specified foreign corporation is a CFC, or any foreign corporation with respect to which one or more domestic corporations are US shareholders. So a UK company that is not US-controlled can still be an SFC if a domestic corporation holds 10 per cent or more of it, which happens where a US corporate investor sits alongside UK founders. Whether a Category 1 filing is actually required then depends on the same test as everywhere else: whether section 965 amounts remain reportable on Schedule J or Schedule P.

Form 5471 Category 1 Filers: UK Company Owners

Form 5471 Category 1 is the filer category built for a US shareholder of a section 965 specified foreign corporation, and for most Americans who own a UK limited company today it is the wrong box. The current instructions define a Category 1 filer as a person who was a US shareholder of a foreign corporation that was a section 965 specified foreign corporation at any time during the foreign corporation's tax year ending with or within the US shareholder's tax year, and who owned that stock on the last day in that year in which the foreign corporation was a section 965 specified foreign corporation. If you own a UK company outright you are almost certainly a Category 4 filer, and described in Category 5a as well. Category 1 still catches a narrow and important group: owners whose UK company carries accumulated earnings and profits related to section 965 on Schedule J, or who hold previously taxed earnings and profits related to section 965 on Schedule P, and anyone assembling late filings that reach back to the section 965 inclusion year itself. This article works from the current revision of the form, Form 5471 (Rev. December 2025), used with the Instructions for Form 5471 (Rev. December 2025).

What is a section 965 specified foreign corporation?

A section 965 specified foreign corporation, abbreviated SFC in the instructions, is a controlled foreign corporation, or any foreign corporation with respect to which one or more domestic corporations are US shareholders. The IRS adds one carve-out: if a passive foreign investment company with respect to the shareholder is not a CFC, then that corporation is not a section 965 SFC. Section 965 and the regulations under it contain further exceptions.

Two features of that definition matter to a UK company owner. First, SFC status is wider than CFC status. A UK limited company that is not controlled by US shareholders can still be an SFC if a single domestic corporation holds 10 per cent or more of it. Second, every CFC is by definition an SFC, which is why the working boundary between Category 1 and Category 5 is not the company's status at all. It is whether section 965 amounts are still in play.

The instructions set that boundary out directly. Under the heading covering when Category 1 reporting is no longer required, a Category 1 filer must continue to file all information required as long as the section 965 SFC, or foreign-controlled section 965 SFC, has accumulated earnings and profits related to section 965 that is reportable on Schedule J (Form 5471), or the Category 1 filer has previously taxed earnings and profits related to section 965 that is reportable on Schedule P (Form 5471). Once neither of those is true, Category 1 reporting stops. That sentence is the practical test, and it is the one competing guides almost never quote.

For Category 1 purposes, a US shareholder is a US person who owns, directly, indirectly or constructively within the meaning of section 958(a) and (b), 10 per cent or more of the total combined voting power or value of shares of all classes of stock of a section 965 SFC. The instructions point to section 951(b). A US person for this category is a citizen or resident of the United States, a domestic partnership, a domestic corporation, or certain other domestic entities listed in the instructions, subject to the exceptions in section 957(c).

How Form 5471 Category 1 differs from Categories 4 and 5

The three categories test different things, and a UK company owner can satisfy more than one in the same year. Read them as three separate questions rather than a ladder.

Category 4 asks about control. A US person who had control of a foreign corporation during the annual accounting period of that foreign corporation is a Category 4 filer. Control means owning stock possessing more than 50 per cent of the total combined voting power of all classes of stock entitled to vote, or more than 50 per cent of the total value of shares of all classes of stock, at any time during that person's tax year. The instructions cite section 6038(e)(2) and Regulations section 1.6038-2(b) and (c).
Category 5 asks about CFC status and a 10 per cent stake. A Category 5 filer is a person who was a US shareholder that owned stock in a foreign corporation that was a CFC at any time during the foreign corporation's tax year ending with or within the US shareholder's tax year, and who owned that stock on the last day in that year in which the foreign corporation was a CFC.
Category 1 asks the same shape of question as Category 5, but keyed to section 965 SFC status rather than CFC status, and it keeps running only while section 965 earnings and profits or section 965 previously taxed earnings and profits remain reportable on Schedule J or Schedule P.

There is a further difference that repeatedly surprises cross-border couples. The definition of a US person is wider for Category 4 than for Categories 1 and 5. For Category 4 it also reaches a nonresident alien for whom an election is in effect under section 6013(g) to be treated as a resident of the United States, and an individual for whom an election is in effect under section 6013(h), relating to nonresident aliens who become residents during the tax year and are married at the close of the year to a citizen or resident. A UK national spouse who joins a US joint return under either election can therefore become a Category 4 filer in their own right for a company they control, even though the same person would not be a US person for Category 1 or Category 5 purposes.

Category 1a, 1b and 1c: what separates the three sub-categories

Item B on page 1 of Form 5471 carries nine boxes: 1a, 1b, 1c, 2, 3, 4, 5a, 5b and 5c. The Category 1 boxes split by two variables only, whether you own stock within the meaning of section 958(a), and whether you are related to the corporation using principles of section 954(d)(3).

Category 1a filer: a Category 1 filer that is not a Category 1b or 1c filer. This is the default, and it is the box a UK company owner would use if Category 1 applies at all.
Category 1b filer: an unrelated section 958(a) US shareholder of a foreign-controlled section 965 SFC. That means a US shareholder who owns, within the meaning of section 958(a), stock of a foreign-controlled section 965 SFC, and who is not related to it using principles of section 954(d)(3).
Category 1c filer: a related constructive US shareholder of a foreign-controlled section 965 SFC. That means a US shareholder who does not own section 958(a) stock of the corporation and who is related to it using principles of section 954(d)(3).

A foreign-controlled section 965 SFC is a foreign corporation that is a section 965 SFC that would not be a section 965 SFC if the determination were made without applying subparagraphs (A), (B) and (C) of section 318(a)(3) so as to consider a US person as owning stock that is owned by a foreign person. In plain terms, it is an SFC only because of downward attribution from a foreign owner. The 1b and 1c boxes exist to carry relief across: the instructions state that they extend the relief for certain Category 5 filers announced in sections 8.02 and 8.03 of Rev. Proc. 2019-40 to similarly situated Category 1 filers.

For a typical UK structure where an American founder holds the shares directly, none of that machinery is engaged. The company is a CFC because of actual ownership, not downward attribution, so if Category 1 applies at all the box is 1a.

Which schedules does a Category 1 filer complete?

This is where Category 1 looks least like Category 4. The Filing Requirements for Categories of Filers chart in the instructions gives each sub-category a short, specific list.

Category 1a: the identifying information on page 1 of Form 5471 above Schedule A, Schedule B Part II, separate Schedule E, Schedule E-1 which is included with separate Schedule E, separate Schedule J, and separate Schedule P.
Category 1b: the page 1 identifying information and separate Schedule P, plus Schedules E and E-1 only if the filer claims deemed paid foreign income taxes of the foreign-controlled section 965 SFC or foreign-controlled CFC under section 960 for the filer's tax year.
Category 1c: the page 1 identifying information, Schedule B Part II, separate Schedule E, Schedule G and separate Schedule G-1. A related constructive US shareholder need only complete Schedule E and can leave Schedule E-1 blank.

Compare that with the instruction the IRS gives for a sole owner. The instructions say that if the filer is described in more than one filing category, do not duplicate information, but complete all items that apply, and then give this example: if you are the sole owner of a CFC, that is, you are described in Categories 4 and 5a, complete all six pages of Form 5471 and separate Schedules E, G-1, H, H-1, I-1, J, M, P, Q and R. That is the whole form. A Category 1a filing is a fraction of it, which is why Category 1 on its own is not the heavy compliance burden people assume, and why misfiling a Category 4 case as Category 1 leaves most of the return missing.

Two mechanical points apply across every category. When a schedule is required but all amounts are zero, the schedule should still be filed with one or more zero amounts rather than omitted. And for schedules that are completed by category, which are Schedules E, I-1, J, P and Q, inclusion of a single instance of that schedule for any separate category will meet the requirement.

A decision path: which Form 5471 category are you actually in?

Run these questions in order, for each company and for each year. The answers can differ year to year for the same company, which is exactly why catch-up filings go wrong.

Step 1. Did you own 10 per cent or more of the total combined voting power or value, counting direct, indirect and constructive ownership within the meaning of section 958(a) and (b)? If no, Categories 1 and 5 are out. Check Categories 2 and 3 separately.
Step 2. Did US shareholders together own more than 50 per cent of the combined voting power, or of the value, on any day of the company's tax year? If yes, the company was a CFC that year.
Step 3. Did you own more than 50 per cent of voting power or value at any time during your tax year? If yes, you had control and you are a Category 4 filer.
Step 4. Did you own the stock on the last day in the year on which the company was a CFC? If yes, you are described in Category 5, and if you are not a 5b or 5c filer that is Category 5a.
Step 5. Does the company have accumulated earnings and profits related to section 965 reportable on Schedule J, or do you have previously taxed earnings and profits related to section 965 reportable on Schedule P? If yes, Category 1 reporting continues. If no, it does not.
Step 6. If Category 1 applies, are you an unrelated section 958(a) US shareholder or a related constructive US shareholder of a foreign-controlled section 965 SFC? If neither, your box is 1a.
Step 7. Complete item B by checking every box that applies, subject to the one suppression rule set out below.

Most UK company owners stop at step 5 with a no. That is the honest answer, and it is far more useful than a page that implies Category 1 is live for everybody who owns a foreign company.

The overlap rule: what the instructions say when Category 4 and Category 5a both apply

This is the point that gets stated wrongly most often, usually as a claim that a sole owner files as both and ticks both boxes. The instructions say something specific and narrow. Under Item B, Category of Filer, the current instructions state, verbatim: "Note: If you satisfy the requirements of both Category 4 and Category 5a filers, only check the box for Category 4 and leave the box for Category 5a blank."

Read that alongside the general rule and the two sit together cleanly. You can be described in both categories, and you complete the information both categories require, because the instructions say not to duplicate information but to complete all items that apply, and because the sole owner example expressly describes that person as being described in Categories 4 and 5a while requiring the full schedule set. What changes is only the box. On item B you check 4 and you leave 5a empty. A return that reports the Category 5a schedules with a 5a box ticked alongside a 4 is not what the instructions ask for, and a preparer who ticks both has not read the note.

Two further points follow from the same paragraph. If you file on behalf of other persons under the joint filers exception, only check the category or categories that apply to you. And the instructions give no equivalent suppression instruction for Category 1, so a filer who is both a Category 4 filer and a Category 1a filer checks 1a and 4, and still leaves 5a blank.

On joint filing generally, one person may file Form 5471 and the applicable schedules for other persons if that person has the same filing requirements as, or greater filing requirements than, the other persons. A US person described in Category 5 may file a joint Form 5471 with a Category 4 filer or another Category 5 filer. A Category 5b filer and a Category 5c filer cannot file jointly, because their filing requirements are not the same. Everyone identified in item H must attach a statement to their own income tax return containing the information described in the item H instructions, and must also complete a separate Schedule P and attach it to that statement if they qualify as a Category 1a, 1b, 4, 5a or 5b filer.

Why Category 1 exists: the section 965 transition tax, in brief

Section 965 was amended on 22 December 2017. It required certain US shareholders to include in income an amount based on the accumulated post-1986 deferred foreign income of specified foreign corporations that were deferred foreign income corporations. The IRS states that the tax applies to the last taxable year of specified foreign corporations beginning before 1 January 2018, that the effective rates applicable to income inclusions are adjusted by way of a participation deduction set out in section 965(c), that a reduced foreign tax credit applies under section 965(g), and that a US shareholder required to pay the tax on a 2017 inclusion must do so either in one lump sum or, pursuant to an election under section 965(h), in eight annual instalments.

The reporting consequence is what created the category. In its guidance on 2017 returns the IRS confirmed that a person who was a US shareholder of a specified foreign corporation during its 2017 taxable year, including on the last day of that year, and who owned stock of the SFC on the last day of the SFC's year that ended during the person's year, had to file a Form 5471 for that corporation regardless of whether the SFC was a CFC, completed with the identifying information on page 1 above Schedule A and with Schedule J. Category 1 is that requirement turned into a permanent box, and Schedule J plus Schedule P are still the two schedules that carry the section 965 numbers forward.

Three things keep section 965 alive on real files years later. An instalment obligation under section 965(h) that is still running or still unpaid. A historic year that was never filed, or that was filed without the Form 5471. And section 965 balances that continue to sit in the Schedule J and Schedule P columns. On the payment side, Form 965-A is the individual report of net 965 tax liability, and its instructions state that it must be completed by a taxpayer for every tax year for which the taxpayer has any net 965 tax liability outstanding and not fully paid at any point during the tax year.

When a UK company owner genuinely lands in Category 1

Being straight about this is more useful than manufacturing relevance. For a UK limited company incorporated after 2017 there can be no section 965 inclusion year and no section 965 balances, so Category 1 cannot apply. For the large majority of American owners of UK trading companies the correct box is 4, or 4 plus 3 in the year of incorporation or of a share transfer. Category 1 is genuinely live in these situations.

The UK company existed before 2018 with accumulated post-1986 earnings, a section 965 inclusion arose, and section 965 earnings and profits or section 965 previously taxed earnings and profits are still reportable on Schedule J or Schedule P.
A section 965(h) instalment obligation is still outstanding, which keeps the section 965 amounts and the associated annual reporting in the file.
You are filing, amending or catching up a year that is itself the section 965 inclusion year, or one of the years since in which those balances were reportable.
The UK company is not a CFC, but a domestic corporation holds 10 per cent or more of it, which can make it a section 965 SFC without it ever having been US-controlled. This arises where a US corporate investor sits on a UK cap table alongside UK founders.
Downward attribution from a foreign parent makes the UK company a foreign-controlled section 965 SFC, which is where the 1b and 1c boxes and the Rev. Proc. 2019-40 relief become relevant.

If none of those describe your file, say so on the form by leaving the Category 1 boxes blank. Checking a box whose conditions you do not meet invites questions you do not need, and it signals a filing position on section 965 that you have not actually taken.

Worked example: a catch-up filing that reaches a section 965 year

An American citizen living in London incorporated a UK limited company in 2012. She holds 100 per cent of the ordinary shares and is the sole director. The company traded profitably, paid UK corporation tax, and retained most of its profits rather than distributing them. She filed US returns for a few early years, then stopped, and comes to us in 2026 wanting to be compliant. Assume retained profits of roughly GBP 400,000 had built up by the end of 2017. The figures are illustrative; the structure of the answer is not.

The category analysis runs year by year. In every year she owned all of the vote and value, so she had control and is a Category 4 filer. In every year the company was a CFC and she held the shares on the last day it was a CFC, so she is described in Category 5a. In 2012 she also crossed the 10 per cent ownership requirement for the first time, which raises Category 3 for that year. The company was a section 965 SFC in its last tax year beginning before 1 January 2018, so for that year she is a Category 1a filer as well. For each later year, Category 1a continues while the section 965 amounts remain reportable on Schedule J or Schedule P.

The assembly follows from that. One Form 5471 per company per year, attached to the income tax return for that year, filed by the due date including extensions for that return. Item B for the section 965 inclusion year carries 1a and 4, with 5a left blank under the overlap note. For the recent years being filed under a streamlined submission, item B carries 4, plus 1a only if the section 965 columns still hold a balance.

The hard part is Schedule J continuity. Schedule J line 1a asks for the balance at beginning of year as reported on prior year Schedule J. Its columns include post-2017 earnings and profits not previously taxed, post-1986 undistributed earnings in the post-1986 and pre-2018 section 959(c)(3) balance, pre-1987 earnings and profits not previously taxed, and previously taxed earnings and profits columns that include reclassified section 965(a) PTEP and reclassified section 965(b) PTEP. Schedule P tracks previously taxed earnings and profits by group, including the section 965(a) PTEP group, the section 965(b) PTEP group and their reclassified counterparts. That means the section 965 pools have to be rebuilt from the inclusion year and rolled forward through every intervening year, including years that are not themselves being filed, or the beginning balance on the first filed year will not tie to anything.

Scope is the other decision. A streamlined submission under the Streamlined Foreign Offshore Procedures covers delinquent or amended returns for each of the most recent three years for which the US tax return due date, or properly applied for extended due date, has passed, and delinquent FBARs for each of the most recent six years for which the FBAR due date has passed. The IRS lists Forms 3520, 5471 and 8938 among the required information returns that must be submitted with those returns. Note the consequence for section 965: a three-year window in 2026 does not reach 2017, so the inclusion year is only in scope if it is separately being filed or amended. Otherwise it is a computation input rather than a filed year, and the file has to evidence it as such.

Practical cross-border points then decide whether the filing holds together. The functional currency is pounds sterling, and every exchange rate must be reported using a divide-by convention rounded to at least four places, expressed as the units of foreign currency that equal one US dollar rather than the other way round. The company's Companies House accounting reference date sets the annual accounting period being reported. The reference ID number for the foreign corporation must stay consistent across years, and any previous reference ID numbers must be reported on page 1. And if you later find that a filed Form 5471 was incomplete or incorrect, the instructions tell you to file a corrected Form 5471 with an amended tax return, enter "Corrected" at the top of the form, and attach a statement identifying the changes.

Constructive ownership and attribution: who counts as a US shareholder

The 10 per cent US shareholder test is not a test of the share register. Ownership is counted directly, indirectly or constructively within the meaning of section 958(a) and (b). Section 318(a)(3) downward attribution, which can treat a US person as owning stock owned by a foreign person, is what produces foreign-controlled section 965 SFCs and foreign-controlled CFCs in the first place, and the 1b, 1c, 5b and 5c boxes exist to sort out who actually has to file in those structures.

Several exceptions turn on the same machinery, and they matter to UK families.

A Category 1 filer does not have to file Form 5471 if all of these are met: the filer does not own a direct interest in the foreign corporation, the filer is required to furnish the information solely because of constructive ownership from another US person, and that other US person files a Form 5471 reporting all of the information required of the Category 1 filer.
A Category 1 filer does not have to file if it does not own a direct or indirect interest in the foreign corporation and is required to file solely because of constructive ownership from a nonresident alien. This is the exception that matters where a US citizen is married to a UK national who owns the shares.
No statement is required to be attached to the tax return of a Category 1 filer claiming either constructive ownership exception. The instructions cite Regulations section 1.6038-2(j)(2) and (3) and 1.6038-2(l).
A Category 1 filer does not have to file if no US shareholder, including the Category 1 filer, owns section 958(a) stock in the section 965 SFC on the last day in the year in which it was a section 965 SFC and the SFC is a foreign-controlled section 965 SFC. This extends relief announced in section 5.02 of Notice 2018-13.
An unrelated constructive US shareholder exception applies where the corporation is a foreign-controlled section 965 SFC, the filer is a US shareholder that does not own section 958(a) stock in it, and the filer is not related to it using principles of section 954(d)(3). This implements relief in section 8.04 of Rev. Proc. 2019-40.

Each of these is an exception from filing, not a reason to treat the analysis as optional. You still have to run the ownership calculation to show that the exception applies, and you should keep the working papers that prove it.

Penalties and reasonable cause for a late Category 1 filing

The exposure does not vary by category. A $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. If the information is not filed within 90 days after the IRS has mailed a notice of the failure to the US person, an additional $10,000 penalty per foreign corporation is charged for each 30-day period, or fraction of one, during which the failure continues after the 90-day period has expired, and that additional penalty is limited to a maximum of $50,000 for each failure.

Foreign tax credit reduction: any person who fails to file or report all of the information required within the time prescribed is subject to a reduction of 10 per cent of the foreign taxes available for credit under sections 901 and 960. If the failure continues 90 days or more after the IRS mails notice, an additional 5 per cent reduction is made for each 3-month period, or fraction of one, after the 90-day period expires. Section 6038(c)(2) limits the amount, and Regulations sections 1.6038-1(j)(4) and 1.6038-2(k)(3) provide for alleviation of this penalty in certain cases.
Section 6046 and Schedule O: a $10,000 penalty applies for each failure for each reportable transaction, with an additional $10,000 for each 30-day period, or fraction of one, after 90 days from IRS notice, limited to a maximum of $50,000. The instructions cite section 6679.
Criminal penalties under sections 7203, 7206 and 7207 may apply for failure to file the information required by sections 6038 and 6046.
Rev. Proc. 2019-40 waives certain penalties under sections 6038 and 6662 for certain persons. Section 7 of that revenue procedure sets out the detail, and it is worth checking in any foreign-controlled structure before conceding a penalty.

Reasonable cause under section 6038 works differently from the way it is usually described. Section 6038(c)(4)(B) provides that, for purposes of the foreign tax credit reduction and of the section 6038(b) penalty, the time prescribed to furnish the information, and the beginning of the 90-day period after notice by the Secretary, is treated as being not earlier than the last day on which reasonable cause existed for the failure to furnish it, as shown to the satisfaction of the Secretary. In plain terms, it moves the clock rather than granting a general amnesty. The strength of a reasonable cause position therefore depends on being able to date the end of the reasonable cause and to show what you did once it ended, not on asserting good faith in the abstract.

Route matters as much as argument. Under the Delinquent International Information Return Submission Procedures, taxpayers who have identified the need to file delinquent international information returns, who are not under a civil examination or a criminal investigation by the IRS and who have not already been contacted by the IRS about the delinquent information returns, should file them through normal filing procedures. Delinquent international information returns other than Forms 3520 and 3520-A should be attached to an amended income tax return and filed according to the applicable instructions for that amended return. A reasonable cause statement may be attached to each delinquent return for which reasonable cause is being asserted. The IRS states plainly that penalties may be assessed in accordance with existing procedures, so this route carries real risk and the statement has to be written to be read by an examiner, not by a client.

Where the taxpayer is non-willful and meets the non-residency requirement, which for a US citizen means that in one or more of the relevant three years the individual did not have a US abode and was physically outside the United States for at least 330 full days, the Streamlined Foreign Offshore Procedures are materially better. Eligible taxpayers will not be subject to failure-to-file and failure-to-pay penalties, accuracy-related penalties, information return penalties or FBAR penalties, and the required information returns including Form 5471 are submitted with the three years of returns.

How we approach a Form 5471 Category 1 question on a UK company

We start with the company's own history rather than with the current year. Was there a pre-2018 period with retained earnings, and was a section 965 inclusion ever computed, or ever missed? Were instalments elected under section 965(h), and were they reported and paid? Only once those questions are answered can anyone say whether the Category 1 boxes belong on a current-year form at all.

From there the work is ordinary but exacting. Rebuild the earnings and profits history in functional currency, carry the Schedule J columns and Schedule P groups forward year by year so that beginning balances tie to the prior year, check the right boxes at item B with Category 5a suppressed where Category 4 applies, and choose the catch-up route that matches the client's actual facts rather than the one that is quickest to prepare. A Form 5471 that is technically filed but internally inconsistent across years is not compliance. It is an invitation.