My Spouse Owns a Canadian Corporation. Do I File Form 5471?

By Yarik Yarosh, CPA ·August 21, 2026 ·8 min read

Written by Yarik Yarosh, CPA (US & Canada) August 21, 2026 · FL CPA license AC61704 · CPA Ontario

Yes, most likely. If you are a US person (citizen, green card holder, or US tax resident) and your spouse owns 10% or more of a Canadian corporation, IRC 958(b)(1) treats you as owning those same shares. That attributed ownership can make the corporation a controlled foreign corporation, which triggers Form 5471, a potential GILTI inclusion, and everything that goes with them. You do not need to hold a single share directly.

✓Key takeaway

IRC 958(b)(1) applies the family attribution rules of IRC 318(a) for the purpose of determining who is a US shareholder. Under IRC 318(a)(1)(A)(i), an individual is treated as owning the stock owned by their spouse. If your spouse owns 100% of a Canadian corporation and you are a US person, you are treated as a 100% US shareholder, the corporation is a CFC, and Form 5471 Category 4 (control) or Category 5 (US shareholder of a CFC) applies. The $10,000 annual penalty for a missed 5471 runs regardless of whether you own the shares directly or through attribution.

How does the attribution work?

Two provisions, read together. IRC 958(b)(1) says that for the purpose of determining who is a US shareholder under IRC 951(b), the constructive ownership rules of IRC 318(a) apply “to the extent that the effect is to treat any United States person as a United States shareholder.” And IRC 318(a)(1)(A)(i) says an individual is considered as owning the stock owned, directly or indirectly, by or for their spouse.

“For purposes of sections 951(b), 954(d)(3), and 956(c)(2), section 318(a) (relating to constructive ownership of stock) shall apply to the extent that the effect is to treat any United States person as a United States shareholder.” IRC 958(b)(1)

“An individual shall be considered as owning the stock owned, directly or indirectly, by or for: (i) his spouse (other than a spouse who is legally separated from the individual under a decree of divorce or of separate maintenance)” IRC 318(a)(1)(A)(i)

So the chain runs: your spouse owns shares of a foreign corporation, IRC 318(a)(1) attributes those shares to you, IRC 958(b)(1) uses that attribution to test whether you are a US shareholder, and if the attributed ownership reaches 10% or more of vote or value, you are one.

A US shareholder, under IRC 951(b), is a United States person who owns 10% or more of the total combined voting power of all classes of stock entitled to vote, or 10% or more of the total value of all shares. A controlled foreign corporation, under IRC 957(a), is a foreign corporation where US shareholders together own more than 50% of vote or value. When your spouse owns 100% of the corporation and attribution gives you 100%, both tests are met on your attributed ownership alone.

What are the consequences?

The consequences are the same as if you owned the shares directly, because the attribution makes them yours for these purposes.

Form 5471: Category 4 (control) or Category 5 (US shareholder of a CFC); $10,000 penalty per year per corporation for missing it, and the statute of limitations stays open
GILTI (net CFC tested income from 2026): under IRC 951A, the section 250 deduction (40% from 2026), section 960(d) deemed paid credit, and for 2025 the QBAI can reduce or eliminate US tax on a Canadian operating company, but reporting is owed regardless; see the GILTI guide
Subpart F income: passive income (investment income, related-party rent, certain service income) is included in your US income currently under IRC 951(a), regardless of distributions
Form 8992: computes GILTI, attached to your return alongside the 5471

Does it matter that my spouse isn’t American?

No. The attribution runs from your spouse’s ownership to you, and it is your US-person status that makes the result matter. Whether your spouse is Canadian, a dual citizen, or a non-resident alien does not affect the attribution. What matters is that you are a United States person and, through attribution, you own 10% or more.

If your non-US spouse elects under IRC 6013(g) or (h) to file jointly, that election treats them as a US resident, making them a United States person for IRC 951(b) purposes
The corporation then has a US shareholder through both your attributed ownership and your spouse’s direct ownership; both of you may owe Form 5471
The first-year election guide flags this as one of the trade-offs

Can anything reduce the US tax on spouse’s corp?

For a Canadian corporation paying 25-27% combined corporate tax, the deemed paid credit under section 960(d) can push the net US tax to zero. A section 962 election is often needed to access the corporate-rate mechanics, and it has its own reporting. The GILTI guide works through the numbers.

For 2025: QBAI shelters a routine return on tangible assets, the section 250 deduction takes 50% off the top, and the deemed paid credit picks up 80% of the Canadian corporate tax
For 2026+: QBAI is gone, the section 250 deduction drops to 40%, the deemed paid credit rises to 90%; whether the Canadian rate still washes the inclusion depends on the specific facts

For 2026 and later, the QBAI is gone. The section 250 deduction drops to 40%. The deemed paid credit percentage rises from 80% to 90%. Whether the Canadian corporate tax rate still washes the US inclusion depends on the specific facts, and the answer changed with the July 2025 Act.

Reducing the tax to zero does not reduce the filing to zero. Form 5471 and Form 8992 are owed regardless of the tax outcome.

Hypothetical example

A hypothetical with made-up numbers. An American works in Toronto on a TN visa. Her husband, a Canadian citizen and non-US person, owns 100% of an Ontario corporation that runs a consulting business. She does not hold any shares and has no role in the company.

Under IRC 958(b)(1) and 318(a)(1)(A)(i), she is treated as owning 100% of the corporation. The corporation is a CFC (more than 50% owned by a US shareholder). She owes Form 5471 with her US return, Category 4.

If the corporation earned $200,000 of active business income in its December 31 fiscal year, tested income for GILTI purposes is roughly that $200,000 (less any QBAI deduction for 2025 only), with the section 250 deduction and deemed paid credit reducing or eliminating the US tax after a section 962 election. The reporting is real work, but the tax itself may be small or zero.

She and her husband consider filing jointly under IRC 6013(g) to simplify her US return. If they do, he becomes a US resident for the year, making him a United States person and a direct US shareholder of his own corporation. Now both of them may have Form 5471 obligations, and his worldwide income enters the US net. The joint-filing simplification came with a corporation-sized complication.

Illustrative numbers only, not a real client and not advice for your facts.

Practitioner note

This one surprises people because the US person has no economic interest in the corporation and no involvement in its operations, and the filing obligation shows up anyway. It often comes to light only years in, when a US preparer finally asks “does your spouse own a company?” In practice, the GILTI tax on an active Canadian business is often small or zero after the section 960 credit, especially with a section 962 election, but the compliance cost is real: Form 5471, Form 8992, the 962 election statement, and the functional currency translation all of it requires. The worse outcome is not filing and building up years of $10,000 penalties with open statute periods. If you’re already behind, the same catch-up routes that apply to a direct owner apply here: delinquent information return procedures where the tax was right, streamlined where it wasn’t.

What should I do next?

Confirm the ownership. If your spouse owns 10% or more of a Canadian corporation and you are a US person, attribution applies and the filing is owed. Check whether you have been including Form 5471 with your US returns. If not, the 5471 guide covers the penalty exposure and the catch-up routes.

If you and your spouse are considering a joint-filing election under IRC 6013(g), factor in what that does to the corporation before making the election
If the corporation generates GILTI or NCTI inclusions, look at the section 962 election before filing; it lets an individual access corporate-rate mechanics and the deemed paid credit
Do I have to file Form 5471 for my Canadian corporation?, the full 5471 rundown including penalties and catch-up
GILTI / net CFC tested income for a Canadian corporation, the income inclusion mechanics
What happens to a Canadian corporation when you move to the US?, the broader corporate story on a cross-border move
Dual-status return or full-year election in your first US year, where the 6013(g) trade-off lives

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Cite this page

Yarik Yarosh, CPA. "My Spouse Owns a Canadian Corporation. Do I File Form 5471?." Blue Cloud CPA, August 21, 2026. https://bluecloudcpa.com/guides/spouse-owns-canadian-corporation-do-i-file-5471

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.