Why the form is so long
Form 5471 is really several returns stapled together. It serves two separate Code sections: §6038, which requires annual reporting by people who control a foreign corporation or are US shareholders of one, and §6046, which requires one-off reporting when stock changes hands or a US officer or director is involved.
On top of that, the form carries the data the US owner needs for subpart F, NCTI (the regime called GILTI until 2026), the foreign tax credit, previously taxed earnings and, for the largest companies, the corporate alternative minimum tax. Each of those jobs has its own schedule.
The result: the current instructions (revised December 2025) recognise nine filer types across five categories (1a, 1b, 1c, 2, 3, 4, 5a, 5b and 5c) and around twenty schedules, and each filer type completes a different mix. That is why the category matters so much. It decides whether you are filing two pages or forty.
How to use this guide
The categories are not alternatives. Test your client against each one separately, because one person can be in three categories at once: a US company that buys 100% of a foreign target is Category 3 (it crossed 10%), Category 4 (it controls) and Category 5a (it is a US shareholder of a CFC) in the year of the deal. It still files one Form 5471 covering all three.
Two other points cause most of the confusion. First, a foreign corporation does not have to be a CFC for a 5471 to be due: Categories 2, 3 and 4 apply to any foreign corporation. Second, "10%" always means 10% of the total voting power or the total value, either one, and the way you count to 10% changes from category to category. The next two sections deal with that before we take each category in turn.
Three definitions you need first
- US person. A US citizen or resident, a domestic partnership or corporation, or an estate or trust that is not foreign. For Category 4 only, it also includes a nonresident alien who has elected under §6013(g) or (h) to be treated as a resident.
- US shareholder. A US person who owns 10% or more of the total combined voting power or the total value of a foreign corporation's stock, counting direct, indirect and constructive ownership under §958(a) and (b). The value test was added by the 2017 tax law; before that, only votes counted.
- Controlled foreign corporation (CFC). A foreign corporation in which US shareholders together own more than 50% of the vote or value on any day of its tax year.
How ownership is counted
Every threshold on the form (10%, more than 50%) is measured using up to three layers of ownership:
- Direct: shares registered in the person's own name.
- Indirect: shares held through foreign corporations, foreign partnerships, foreign trusts or foreign estates, counted proportionately. If you own 40% of a foreign holding company that owns 50% of the target, you indirectly own 20% of the target.
- Constructive: shares you are treated as owning because a family member, an entity you own, or (in some cases) an entity that owns you holds them. Under the §318 rules used for Categories 1, 4 and 5, an option to buy shares also counts as owning them.
The catch is that each category borrows its constructive-ownership rules from a different Code section. The same person can be a 10% owner for Category 3 and not for Category 5:
| Rule | Categories 1 and 5 (§958(b)) | Category 4 (§6038(e)(2)) | Categories 2 and 3 (§6046(c)) |
|---|---|---|---|
| Family members whose shares count | Spouse, children, grandchildren, parents | Spouse, children, grandchildren, parents | Spouse, brothers and sisters, ancestors, lineal descendants |
| Nonresident alien relatives | Not attributed to a US citizen or resident | Attributed, but a filer whose only link is a nonresident alien is excused | Attributed |
| Shares held by a corporation | Attributed proportionately to shareholders owning 10% or more by value (an entity with more than 50% of a company's votes is treated as owning all of its voting stock) | Attributed to shareholders owning 10% or more, proportionately | Attributed proportionately through foreign corporations and foreign partnerships |
| Shares of a foreign owner pushed down to a US person | Counted for 2018 to 2025 only; switched off for foreign corporations' tax years starting after 2025 | Never counted | Not applied |
Family attribution cannot be chained under any of these rules: shares attributed to you from your spouse are not attributed again from you to your parents. And under §958, constructive ownership is only used to make someone a US shareholder or to make a company a CFC; it is never used to take anyone out of a category.
When each test is measured
The other trap is timing. Each category looks at a different moment, so a client who sold half their stake in June can be in one category and out of another for the same year:
| Category | The moment that matters |
|---|---|
| 1 | The corporation was a section 965 corporation at any time in its tax year ending with or within your tax year, and you owned the stock on the last day it was one |
| 2 | The tax year in which a US person makes a qualifying acquisition while you are an officer or director |
| 3 | The date of the acquisition, disposition or change in your status |
| 4 | Any time during the foreign corporation's annual accounting period |
| 5 | The corporation was a CFC on any day of its tax year ending with or within your tax year, and you owned the stock on the last day it was a CFC |
Category 1: section 965 shareholders
Category 1 is a legacy of the 2017 transition tax. It covers a US shareholder of a section 965 specified foreign corporation: a CFC, or any foreign corporation that has at least one domestic corporation as a US shareholder (a PFIC that is not also a CFC is excluded). The filer must have owned the stock on the last day of the year in which the corporation was a section 965 corporation.
It survives because section 965 earnings take years to work through. A Category 1 filer keeps filing for as long as the corporation still has section 965 earnings to report on Schedule J, or the filer still has section 965 previously taxed earnings to report on Schedule P.
Category 1 is met when all of these are true
- You are a US person: a US citizen or resident, a domestic partnership or corporation, or an estate or trust that is not foreign.
- At some point in its tax year ending with or within your tax year, the foreign corporation was a section 965 specified foreign corporation: a CFC, or a foreign corporation with at least one US corporation owning 10% or more of it. A PFIC that is not also a CFC is excluded.
- You are a US shareholder of it: 10% or more of the total vote or value, counting direct, indirect and constructive ownership under §958.
- You owned the stock on the last day of that year on which it was a section 965 corporation.
- There is still section 965 history to report: section 965 earnings on Schedule J, or section 965 previously taxed earnings on Schedule P. Once both have run out, Category 1 ends.
Category 1 splits three ways, using the same tests as Categories 5b and 5c below. 1b is an unrelated shareholder that owns stock directly or through foreign entities in a foreign-controlled section 965 corporation. 1c is a related shareholder that owns only constructively. 1a is everyone else.
What each subtype files: 1a completes Schedule B (Part II), E and E-1, J and P. 1b completes Schedule P, plus E and E-1 only if it claims deemed-paid foreign tax credits. 1c completes Schedule B (Part II), E (not E-1), G and G-1. In practice most Category 1 filers are also Category 4 or 5 filers, and the Category 1 schedules simply ride along on the same form.
Category 2: officers and directors
Category 2 is about people, not owners. A US citizen or resident who is an officer or director of a foreign corporation is a Category 2 filer if, during the year, a US person acquired enough stock to reach 10% of the vote or value, or acquired an additional 10% or more.
The officer does not need to own a single share, because the filing is triggered by someone else's acquisition. It is also the lightest category: page 1 of the form and Schedule O, Part I.
Category 2 is met when all of these are true
- You are an individual who is a US citizen or resident. Companies and partnerships cannot be Category 2 filers.
- You are an officer or director of the foreign corporation. The title is what matters; you need no shares at all.
- During the year, a US person acquired stock in the corporation that either brought that person to 10% or more of the total vote or value, or was an additional 10% or more of the stock.
- The acquirer can be any US person: a US fund, a US company, another individual, or you. A person has "acquired" stock once they have an unqualified right to receive it, even if the shares have not yet been issued.
- The acquirer's 10% is counted with the §6046 rules: stock held through foreign corporations and partnerships, plus stock held by their spouse, brothers and sisters, ancestors and lineal descendants.
A note on the statute. Section 6046(a)(1)(A) as it now reads is triggered when a US citizen or resident becomes an officer or director of a foreign corporation while a US person meets the 10% test. The form instructions and regulations still use the acquisition test above. If a client joins the board of a company that already has a 10% US owner, check both.
When it is not met
No qualifying acquisition in the year means no Category 2 filing, however senior the officer. Buying shares that take a US investor from 3% to 8% does not count, and nor does a foreign investor buying 40%.
There is an exception. No Category 2 filing is needed if, immediately after the acquisition, three or fewer US persons own 95% or more of the stock by value and the acquirer files as a Category 3 filer.
Example. A US citizen is finance director of a Mexican company. In March, a US private equity fund buys 25% of it. The director is a Category 2 filer for that year and files page 1 and Schedule O, Part I with their own return. If the fund buys another 10% two years later, the director files again for that year.
Category 3: acquisitions, dispositions and new US persons
Category 3 is met when any of these happens in your tax year
- You cross 10%. You acquire stock and, counting what you already hold directly, indirectly and through family, you now own 10% or more of the vote or value. Going from 8% to 11% triggers it.
- You acquire a 10% block. You acquire stock that is 10% or more on its own, whatever you already held. Going from 15% to 25% triggers it again.
- You become a US person while already owning 10% or more, for example a foreign executive who becomes a US resident, or a foreign trust that becomes a domestic one.
- You drop below 10%. You dispose of enough stock to take you under 10%. This is usually your last Category 3 filing for that corporation.
- You are a §953(c) shareholder. You are treated as a US shareholder of a foreign insurer under the related person insurance income rules, which can apply at any ownership level.
Ownership is counted with the same §6046 rules as Category 2, which include brothers and sisters. A filer who owns nothing directly and is in Category 3 only because of stock attributed from another US person does not file, provided that person files a 5471 with all the required information.
Because Category 3 captures the moment ownership changes, its schedules read like a snapshot of the company: its stock and shareholders (Schedules A and B), its income statement and balance sheet (C and F), other information and cost sharing (G and G-1), and Schedule O, Part II describing the acquisition or disposition. The filer also attaches a statement listing the company's debts to related persons and everyone who subscribed for its stock.
Example. A US citizen owns 4% of a Brazilian company and buys another 3%. Their sister, also a US citizen, owns 5%. Under the Category 3 family rules the sister's shares count, so the buyer now owns 12% and is a Category 3 filer for the year of the purchase. Under the §958 rules used for Category 5, siblings are not attributed, so for Category 5 the same buyer is only a 7% holder and not a US shareholder.
Category 4: control
A US person who controls the foreign corporation at any time during its annual accounting period is a Category 4 filer. Control means owning more than 50% of the vote or the value. Control also chains downward: if A controls B and B owns more than 50% of C, A is treated as controlling C. The IRS's example is a chain of 51% holdings, where the company at the top controls the one at the bottom.
Category 4 is met when all of these are true
- You are a US person. Category 4 alone also includes a nonresident alien who has elected under §6013(g) or (h) to be treated as a US resident, usually to file jointly with a US spouse.
- At any time during the foreign corporation's annual accounting period, you owned more than 50% of its total voting power or of the total value of its stock. Exactly 50% is not control.
- Or you control a corporation that owns more than 50% of it, at any level of the chain.
- Ownership counts direct, indirect and constructive stock under §318 as modified by §6038(e)(2): family members, stock held by entities you own 10% or more of, and options, but never a foreign owner's stock pushed down to you.
A filer that owns nothing directly and is in control only through stock attributed from another US person does not file if that person files. Nor does a filer with no direct or indirect stake whose control comes only from a nonresident alien relative.
Category 4 is the heaviest category. It is the only category that files Schedule M, which reports transactions between the corporation and its shareholders and other related persons, and it completes almost every other schedule as well.
Example. Two US citizens who are married each own 30% of a Canadian company. Neither has more than 50% alone, but under family attribution each is treated as owning 60%, so both are Category 4 filers. Because US shareholders own 60%, the company is also a CFC and both are Category 5a filers as well. Their filing requirements are identical, so they can file one joint 5471.
Category 5: US shareholders of a CFC
A US shareholder of a foreign corporation that was a CFC at any time during its tax year, and who owned the stock on the last day it was a CFC, is a Category 5 filer. Before 2018 the corporation had to be a CFC for an uninterrupted 30 days; the 2017 tax law removed that requirement, so a single day now counts. This is the category most minority investors in a US-controlled foreign company land in.
Category 5 is met when all of these are true
- The foreign corporation was a CFC on at least one day of its tax year: US shareholders, each owning 10% or more, together owned more than 50% of its vote or value.
- You are one of those US shareholders: 10% or more of the total vote or value, counting direct, indirect (§958(a)) and constructive (§958(b)) ownership.
- You owned the stock on the last day in that year on which the corporation was a CFC.
- The corporation's tax year ends with or within your tax year. That tells you which of your returns the 5471 is attached to.
- Separately, for a foreign insurer with related person insurance income, a US person that owns any stock is a US shareholder, even below 10%, unless the insurer has elected under §953(c)(3)(C) to treat that income as effectively connected with a US business.
Only US shareholders count towards the 50%. If six unrelated US individuals each own 9% of a foreign company, Americans own 54% of it, but none of them is a US shareholder, so the company is not a CFC and nobody is a Category 5 filer. If one of them buys another 2%, they become an 11% US shareholder, but US shareholders still own only 11%, so the company is still not a CFC. That buyer is a Category 3 filer for the year they crossed 10%.
Why there is a 5a, 5b and 5c
Before 2018, §958(b)(4) stopped stock owned by a foreign person from being attributed down to a US person. The 2017 tax law repealed it. As a result, a foreign parent with both a US subsidiary and a foreign subsidiary made the US subsidiary a constructive owner of its foreign sister company. The sister became a CFC even though no American really controlled it, and many foreign-owned groups picked up new 5471 filings.
Rev. Proc. 2019-40 gave relief, and the instructions turned that relief into subcategories:
- 5b: unrelated section 958(a) US shareholder of a foreign-controlled CFC. A US shareholder that actually owns stock, directly or through foreign entities, in a corporation that is a CFC only because of downward attribution, and that is not related to it. It files a reduced set of schedules.
- 5c: related constructive US shareholder of a foreign-controlled CFC. A US shareholder that owns no stock directly or indirectly, only constructively, and is related to the CFC. The typical 5c filer is the US subsidiary of a foreign parent.
- 5a: every other Category 5 filer.
Two further exceptions mean some of these people file nothing at all. A US shareholder of a foreign-controlled CFC that owns no stock directly or indirectly and is not related to it does not file. And if no US shareholder owns stock in a foreign-controlled CFC directly or indirectly, nobody has to file for it.
2026: downward attribution is switched back off
For foreign corporations' tax years beginning after December 31, 2025, the One Big Beautiful Bill Act restored §958(b)(4), so stock held by a foreign person is no longer attributed down to a US person when testing CFC status. In its place, a new §951B targets US persons that own more than 50% of a foreign-controlled foreign corporation and treats them like US shareholders of a CFC for subpart F and NCTI purposes.
Many foreign-owned groups that were CFCs only because of downward attribution should therefore drop out of Category 5 from 2026. The December 2025 instructions still describe 5b and 5c, and how the IRS redraws them for 2026 tax years is not yet settled, so check the latest revision before preparing a 2026 return.
A quick test: which categories is my client in?
Work through every question and note each category that applies; one form then covers them all.
- Is the client a US citizen or resident who is an officer or director, and did any US person cross 10% or add another 10% this year? Category 2.
- Did the client cross 10% upwards, buy a 10% block, drop below 10%, or become a US person while holding 10%? Category 3.
- Did the client own more than 50% of the vote or value at any point in the year, directly, indirectly or through attribution? Category 4.
- Was the company a CFC on any day, and is the client a 10% US shareholder who held stock on the last CFC day? Category 5, then check whether the company is foreign-controlled (5b or 5c).
- Does the company still carry section 965 earnings, or does the client still hold section 965 previously taxed earnings? Category 1.
- Finally, check the exceptions: constructive-only owners whose US source files, joint filing, foreign-controlled CFC relief and dormant companies.
Which schedules each category completes
Every category completes the identifying information on page 1. Beyond that, these are the schedules each filer type must complete, taken from the chart in the December 2025 instructions:
| Category | Schedules required |
|---|---|
| 1a | B (Part II), E and E-1, J, P |
| 1b | P; E and E-1 only if claiming deemed-paid foreign tax credits |
| 1c | B (Part II), E (not E-1), G, G-1 |
| 2 | O (Part I) |
| 3 | A, B (Parts I and II), C, F, G, G-1, O (Part II) |
| 4 | A, B (Parts I and II), C, E and E-1, F, G, G-1, H, H-1*, I, I-1, J, M, P, Q, R |
| 5a | B (Part II), E and E-1, G, G-1, H, H-1*, I, I-1, J, P, Q, R |
| 5b | H-1*, I, I-1, P, Q; E and E-1 only if claiming deemed-paid foreign tax credits |
| 5c | B (Part II), E (not E-1), G, G-1, I-1 |
*Schedule H-1 is required only if the US shareholder is an applicable corporation for the corporate alternative minimum tax.
And here is what each schedule reports:
| Schedule | What it reports |
|---|---|
| A | The foreign corporation's stock |
| B | Part I: its US shareholders. Part II: its direct shareholders |
| C | Income statement |
| E and E-1 | Foreign income taxes paid, accrued or deemed paid, and the running balance of those taxes |
| F | Balance sheet |
| G and G-1 | Other information (yes/no questions) and cost sharing arrangements |
| H and H-1 | Current earnings and profits, and adjusted net income for the corporate minimum tax |
| I and I-1 | The shareholder's income from the corporation (subpart F and similar), and the data needed for NCTI |
| J | Accumulated earnings and profits |
| M | Transactions with shareholders and other related persons |
| O | Organisation or reorganisation, and acquisitions and dispositions of stock |
| P | Previously taxed earnings and profits |
| Q | Income, deductions and taxes by CFC income group (foreign tax credit) |
| R | Distributions from the foreign corporation |
Two rules stop this from multiplying. If you fall into more than one category, you complete everything that applies once, without duplication: the sole owner of a CFC is both Category 4 and 5a, and files one form covering both. And a required schedule with nothing to report is still filed, showing zeros.
Filing once for several people
- Constructive owners. A Category 1, 3, 4 or 5 filer with no direct interest, who is a filer only because of stock attributed from another US person, does not file if that other person files a 5471 with all the required information. A filer with no direct or indirect interest whose ownership is attributed only from a nonresident alien is also exempt (Categories 1, 4 and 5).
- Joint filing. One person can file for others whose filing requirements are the same as or smaller than theirs. A 5b filer and a 5c filer cannot file jointly, because their requirements differ. Those who rely on someone else's filing attach a statement to their own return, and Category 1a, 1b, 4, 5a and 5b filers also attach their own Schedule P.
- Dormant corporations. A foreign corporation that meets the dormancy test in Rev. Proc. 92-70 can be reported on a short summary return.
Worked examples
- A US company owns 100% of an Irish subsidiary. It controls the subsidiary, so it is Category 4, and it is a US shareholder of a CFC, so it is also Category 5a. It files one Form 5471 a year covering both, which in practice means almost the whole form, including Schedule M.
- A US individual buys 12% of a Japanese company owned otherwise by Japanese residents. They are a 10% shareholder, but US shareholders own only 12% in total, so the company is not a CFC and they are not Category 4 or 5. They are Category 3 for the year they cross 10%, and again in any year they drop below it. In between, there is no 5471, but they should check whether the company is a PFIC.
- A US citizen sits on the board of a Singapore company, and a US fund buys 15% of it. The director is Category 2 for that year (page 1 and Schedule O, Part I) even though they own nothing. The fund is Category 3.
- The IRS's own example of 5a and 5c (tax years before 2026). A foreign parent owns 85% of a foreign subsidiary and all of a US company; an unrelated US corporation owns the other 15% of the subsidiary. Through downward attribution, the US company is a constructive owner and the subsidiary is a foreign-controlled CFC. The US company owns no shares directly and is related to the subsidiary, so it is Category 5c. The unrelated 15% owner holds its shares directly and is Category 5a. Remove that 15% owner and nobody files, because no US shareholder would own stock directly or indirectly.
What's a DRE?
DRE is shorthand for disregarded entity: an entity that exists under local law but is ignored for US income tax, so its owner is treated as holding its assets and earning its income directly. A single-member US LLC is disregarded by default, and many foreign entities can choose to be disregarded by filing Form 8832 (the check-the-box election). Some foreign company types are always corporations and cannot make that choice.
The IRS forms call a foreign one an FDE (foreign disregarded entity), and the person treated as owning it is its tax owner. That matters here in two ways. If a CFC owns an FDE or runs a foreign branch, the FDE's figures are folded into the CFC's own 5471 schedules. And the US filers also file Form 8858 for the FDE: Category 4 filers complete the whole 8858 and its Schedule M, while Category 5 filers complete only its page 1 and Schedules G, H and J.
Penalties and the open statute
- Annual reporting (§6038). $10,000 for each foreign corporation for each year. If the form is still missing 90 days after the IRS mails a notice, another $10,000 accrues for each 30 days, up to $50,000 more. The filer can also lose 10% of the foreign taxes available for credit, plus 5% for each further three months.
- Ownership changes (§6046, Categories 2 and 3). $10,000 for each reportable transaction, with the same continuation penalty up to a further $50,000.
- Criminal penalties under §§7203, 7206 and 7207 are possible for wilful failures.
The bigger risk is often the statute of limitations. Under §6501(c)(8), if a required 5471 is not filed, the IRS's time to assess tax on the whole return, not just the international items, does not run out until three years after the information is finally provided. If the failure was due to reasonable cause and not wilful neglect, the extension is limited to the items related to the missing form. So a 5471 missed years ago can leave every one of those returns open.
Sources
- Instructions for Form 5471 (12/2025), IRS
- Instructions for Form 8858, IRS
- Rev. Proc. 2019-40, IRS
- 26 U.S. Code § 958, Cornell LII
- 26 U.S. Code § 318, Cornell LII
- 26 U.S. Code § 6038, Cornell LII
- 26 U.S. Code § 6046, Cornell LII
- 26 CFR § 1.6046-1, Cornell LII
- 26 U.S. Code § 6501, Cornell LII
Related reading
- Form 8621 and PFIC Reporting Explained
- Form 8865 Filer Categories Explained
- Glossary: CFC (controlled foreign corporation)
- Glossary: NCTI, formerly GILTI
This explainer is analysis and general information, not tax, legal or investment advice.