Your Spouse Owns the Canadian Corporation: When the Form 5471 Attribution Rules Make It Your Filing Too

Short version: Form 5471 Explained: U.S. Owners of Foreign Corporations

Form 5471 asks who owns a foreign corporation, and the answer includes shares a person is deemed to own through family members — but the deeming rules were written with a specific limit that makes the mixed-status couple's analysis different from what either instinct suggests. The framework: the controlled foreign corporation rules and Form 5471's filing categories use constructive ownership rules borrowed from the corporate attribution provisions of the Code, under which an individual is treated as owning stock owned by their spouse, children, grandchildren, and parents. Applied naively, the US-citizen spouse of a Canadian who owns 100% of a Canadian corporation would be deemed to own 100%, making the corporation a controlled foreign corporation with the US spouse as a Category 5 filer — full Form 5471 reporting, Subpart F and tested-income inclusions, the whole regime. The limit that changes the answer: the CFC attribution rules provide that family attribution does not apply to treat a US person as owning stock owned by a nonresident alien individual. A Canadian spouse who is not a US citizen, not a green card holder, and not a US tax resident is a nonresident alien — and their shares are not attributed to the US-citizen spouse for purposes of determining CFC status or US shareholder status. The corporation is therefore not a CFC by reason of the marriage; the US spouse is not a US shareholder; and no Category 5 filing arises from the spouse's ownership alone. The result reverses when the owning spouse is a US person: a dual-citizen spouse, a green card holder, or a Canadian who has become a US tax resident is not a nonresident alien, and their shares are attributed — the corporation becomes a CFC, both spouses are US shareholders (the owner directly, the other constructively), and both have filing obligations (the constructive owner's often satisfied by a reduced or joint filing under the form's rules for multiple filers, but the analysis and disclosure are required). Two other routes to a filing obligation survive even where attribution fails. First, the US spouse's own shares: if the US citizen holds any shares directly — the common 10% or 50% holding in a family professional corporation where the province permits — they are a direct owner, and the CFC and US-shareholder tests run on their own ownership (10% or more by vote or value makes them a US shareholder; if US shareholders together own more than 50%, it's a CFC — and here the nonresident spouse's shares still aren't counted toward the more-than-50%, so a US spouse holding 40% of a corporation whose other 60% is held by a Canadian spouse owns 40% of a non-CFC: a US shareholder of a foreign corporation that is not a CFC, with Category 3 reporting on acquisition and no Subpart F or tested-income inclusions). Second, offices and directorships: Form 5471 Category 2 and Category 3 filings attach to US persons who are officers or directors of a foreign corporation when certain US-person acquisitions of stock occur — so the US citizen who is a director of the Canadian spouse's corporation (a common arrangement in family corporations) has a Category 2 obligation when a US person acquires the requisite stock, independent of ownership. Practical consequences for mixed-status couples: the structure where the Canadian spouse owns 100% and the US spouse holds no shares and no office is the cleanest — no 5471, no CFC, no anti-deferral inclusions — and it is often chosen deliberately in planning; the structure where the US spouse holds shares triggers analysis on the US spouse's own percentage (and, at 10% or more, a US shareholder filing even without CFC status); and the structure where both are US persons is a full CFC with the entire regime, in which case the section 962 and high-tax exception guides become the annual reading. The change-in-status trap: a Canadian owning spouse who later obtains a green card or becomes a US tax resident converts the corporation into a CFC on the day their status changes — the attribution that didn't apply yesterday applies today — and the couple's 5471 obligations begin with that year, a consequence of immigration decisions that rarely gets tax review before the fact. Reporting for the US spouse who is not a filer still has one item: the FBAR and Form 8938 do not care about attribution rules but do care about signature authority and financial interest — a US spouse who can sign on the corporation's bank account reports it on the FBAR, and one who holds shares directly reports the shares on Form 8938 (unless reported on a 5471).

Key takeaways

• The nonresident-alien limit is the whole answer for most couples: a Canadian spouse's shares are not attributed to a US-citizen spouse — no CFC, no US shareholder status, no Category 5 filing from the marriage alone.
• Attribution turns on when the owning spouse becomes a US person: dual citizenship, a green card, or US tax residency converts the corporation into a CFC on the status change date, with both spouses as US shareholders.
• Your own shares run their own tests: 10% or more directly makes you a US shareholder (Category 3 on acquisition) even where the corporation isn't a CFC because the nonresident spouse's majority isn't counted; no anti-deferral inclusions without CFC status.
• Offices and directorships file independently: a US-citizen director or officer of the spouse's corporation has Category 2 obligations on qualifying US-person stock acquisitions, regardless of owning anything.
• The cleanest structure is deliberate: Canadian spouse owns 100%, US spouse holds no shares and no office — no 5471 at all; chosen at incorporation, it saves the annual regime.
• FBAR and 8938 don't use attribution: signature authority on the corporate account goes on the US spouse's FBAR; directly held shares go on their 8938 — reportable even when no 5471 is.

The mixed-couple ownership screen

Who owns what, exactly — direct percentages by vote and value for each spouse? What is each spouse's US status — citizen, green card, US resident, or nonresident alien — and did it change during the year? Does the US spouse hold any office or directorship? Does the US spouse have signature authority on corporate accounts? From those four facts: attribution applies or not; CFC or not; the US spouse's category (none, 2, 3, or 5); and the FBAR/8938 items. Then the planning question — should the US spouse's shares or directorship be restructured to remove a filing the family gains nothing from? — answered before the next fiscal year rather than in the next filing season.

Worked example

Three couples, one screen. Couple one: a Canadian physician owns 100% of her medical professional corporation; her US-citizen husband holds no shares and no office, but is a signatory on the corporation's operating account. Attribution: none (she is a nonresident alien to the US). Result: no CFC, no 5471; his FBAR reports the corporate account by signature authority; nothing else. Couple two: same corporation, but the husband holds 25% of the non-voting shares (permitted by their provincial rules) and sits on the board. Attribution: still none from her shares. His own 25%: a US shareholder (over 10%) of a foreign corporation that is not a CFC (her 75% doesn't count toward the more-than-50% US ownership test) — Category 3 filing on acquisition and Category 2 as a director on qualifying events, no Subpart F or tested-income inclusions, his shares on Form 8938. The planning conversation: the 25% non-voting stake exists for income-splitting reasons Canada's tax-on-split-income rules have largely neutralized anyway — restructuring it out removes his 5471 obligations entirely, and they do. Couple three: a Canadian owner-spouse who obtains a US green card in March while continuing to live in Toronto part of the year. Attribution: from March, her shares are attributed to her US-citizen husband; she is herself a US person. Result: the corporation is a CFC from March; both are Category 5 filers for the year; Subpart F and tested-income analysis begins; the section 962 election is modeled; and the couple learns that the immigration decision they made for travel convenience created a full CFC regime that a ten-minute tax review would have flagged. Same corporation type in all three; the spouses' status and holdings — not the marriage — decided every outcome.

Official sources

"Certain U.S. citizens and residents who are officers, directors, or shareholders in certain foreign corporations file Form 5471." — Internal Revenue Service, About Form 5471, https://www.irs.gov/forms-pubs/about-form-5471

"In general, a CFC is a foreign corporation that has U.S. shareholders that own (directly, indirectly, or constructively, within the meaning of section 958(a) and (b)) on any day of the tax year of the foreign corporation, more than 50% of: 1. The total combined voting power of all classes of its voting stock, or 2. The total value of the stock of the corporation." — Internal Revenue Service, Instructions for Form 5471, https://www.irs.gov/instructions/i5471

Practitioner note

The mixed-status couple's 5471 question has a precise answer most people guess wrong in one of two directions: a nonresident-alien spouse's shares are not attributed, so the marriage alone creates nothing — while the US spouse's own shares, offices, and signature authority create obligations of their own, and the owning spouse's later green card converts everything overnight. Our ownership screen runs four facts per couple and, more often than not, ends with a restructuring that removes a filing the family never benefited from.

See also: Browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the mixed-couple ownership review — attribution analysis keyed to each spouse's US status, the US spouse's own-share and directorship categories, FBAR and 8938 items outside the attribution rules, and restructuring recommendations to eliminate unneeded filings. See cross-border pricing or book a call.