Do I Have to File Form 5471 for My Canadian Corporation?

Probably, yes. If you’re a US person, meaning a citizen, green card holder, or US tax resident, and you own at least 10% of a Canadian corporation or control it, Form 5471 attaches to your US income tax return and is due when the return is due, extensions included. Missing it runs $10,000 per year, per corporation. The quieter cost is worse: until the form is filed, the IRS’s time limit for assessing tax on that year’s return doesn’t start.

Who has to file Form 5471?

Five categories of filer, set out in the Form 5471 instructions (Rev. December 2025), and they group by function. You file if you controlled the corporation, over 50% of vote or value at any time in its accounting period (Category 4). You file if you own 10% or more of a CFC, a controlled foreign corporation (Category 5). You file in a crossing year: stock acquired reaching 10%, dropping below 10%, or becoming a US person while holding 10% (Category 3). Narrower: officers and directors during a US person’s 10% buy-in (Category 2), and a 2017 transition-tax leftover (Category 1).

Category	Who it catches	Statute behind it	Typical case for a Canadian corporation
4	A US person with control: more than 50% of vote or value at any time in the corporation’s accounting period	IRC 6038	The owner-manager, every year they hold control
5	A US shareholder, 10% or more of vote or value, of a CFC, holding on the last day in the year it was a CFC	IRC 6038; definitions at IRC 951(b), 957, per the instructions	Every 10% US owner, once US shareholders together hold more than 50% on any day of the year
3	A person who crosses a line: acquires stock reaching 10%, falls below 10%, or becomes a US person while holding 10%	IRC 6046, with the penalty at IRC 6679	The move year: you became a US resident still holding your shares
2	A US citizen or resident who is an officer or director of a foreign corporation in which a US person acquires a 10% stake	IRC 6046	You sit on the Canadian board while a US investor buys in
1	A US shareholder of a section 965 “specified foreign corporation”	IRC 965 and 6038	Rare for a plain Canadian corporation; a holdover category

Two details from the instructions are worth catching. If you fit both Category 4 and Category 5a, you check only the Category 4 box and leave 5a blank. And “US person” for Category 4 includes a nonresident with a joint-filing election under section 6013(g) or (h) in effect, so the election that simplifies a couple’s first US return can put Form 5471 on it. The first-year election guide weighs that choice. If the duty arrived because you moved, the corporate side of the move itself, losing CCPC status, CFC arrival, GILTI, is a separate story told in what happens to a Canadian corporation when you move to the US.

What does missing Form 5471 cost?

The base penalty is $10,000 per missed year, per corporation, and it doesn’t depend on tax owing; a year with zero US tax due still carries it. IRC 6038(b)(1) charges it for the control and ownership filings (Categories 4 and 5), and IRC 6679(a) charges the same $10,000 for a missed section 6046 filing (Categories 2 and 3) unless the failure is due to reasonable cause. After IRS notice and a 90-day grace, continuation penalties can add up to $50,000 more per failure.

Layer	What it costs	Where it comes from
Base penalty	$10,000 for each annual accounting period, per foreign corporation, tax due or not	IRC 6038(b)(1); for Categories 2 and 3, IRC 6679(a), unless reasonable cause is shown
Continuation	Another $10,000 per 30 days (or fraction) once the failure runs more than 90 days past the IRS notice, capped at an extra $50,000 per failure	IRC 6038(b)(2), 6679(a)(2)
Credit cut	A 10% reduction of the foreign taxes available for credit under sections 901 and 960, on a section 6038 failure	The instructions; reasonable-cause relief at Regulations 1.6038-2(k)(3)

The reasonable-cause relief on the 6038 side isn’t automatic: the regulation wants “an affirmative showing of all facts alleged as reasonable cause,” which is why the statement you attach matters more than the filing itself.

Can the IRS still audit a year with a missing Form 5471?

Yes, and with no time limit until you fix it. The normal rule gives the IRS 3 years after a return is filed to assess tax (IRC 6501(a)). IRC 6501(c)(8) overrides that where international information reporting, including the Form 5471 duties under sections 6038 and 6046, is missing: assessment stays open until 3 years after the information is furnished, and on the statute’s own words that reaches the whole return, unless reasonable cause narrows it to the related items under 6501(c)(8)(B).

“…the time for assessment of any tax imposed by this title with respect to any tax return, event, or period to which such information relates shall not expire before the date which is 3 years after the date on which the Secretary is furnished the information required to be reported under such section.” (IRC 6501(c)(8)(A)) (narrowed by (c)(8)(B) on reasonable cause)

Two practical points follow. Each year stands alone: filing the current year’s 5471 starts the clock for that year only, and an older year closes 3 years after its own form is furnished. And the open window covers tax assessment itself: on a return held open this way, the statute’s text reaches items that have nothing to do with the corporation, unless the failure was due to reasonable cause and not willful neglect, in which case only the related items stay open.

How do I catch up on late Form 5471s?

Pick the route by whether the tax was right. If every year’s income was reported and only the forms are missing, the IRS’s delinquent international information return submission procedures (DIIRSP) apply: late 5471s attached to amended returns through normal channels, a reasonable cause statement on each, and open only while you’re not under examination or criminal investigation and the IRS hasn’t contacted you about the forms. If income was also underreported and the failure was non-willful, the streamlined procedures sweep the late 5471s in with three years of amended or delinquent returns.

Route	Fits when	What goes in
DIIRSP	The tax was right and only the information returns are missing; you’re not under civil examination or criminal investigation, and the IRS hasn’t already contacted you about the forms	The late 5471s attached to amended returns, filed through normal channels, with a reasonable cause statement on each form you assert it for
Streamlined	Income was also underreported and the failure was non-willful; closed once the IRS has initiated a civil examination for any year, related to the foreign assets or not	Three years of amended or delinquent returns with all required information returns, 5471s included, plus six years of FBARs and the certification

DIIRSP makes no penalty promise. Since its 2020 revision the page says penalties “may be assessed in accordance with existing procedures,” and warns that a penalty can be assessed before your reasonable cause statement is considered, leaving you to answer IRS correspondence to press it. It’s a filing route with a paper trail, and the reasonable cause statement is where the real work sits.

Both IRS pages were live when this guide was written: DIIRSP last reviewed April 19, 2026, and still one of the three offshore options on the IRS options list as of June 30, 2026. Check again the week you file. The parallel FBAR-only route vanished from that same list in mid-2026, a removal documented in the late-FBAR guide.

The streamlined side needs a certification that the failure came from non-willful conduct, which the IRS defines as negligence, inadvertence, mistake, or a good-faith misunderstanding of the law, and the foreign version requires the full tax and interest to go in with the filings. The mechanics, three years of returns, six of FBARs, the certification form, live in the never-filed catch-up guide.

Is Form 5471 the same as Form 5472?

No, they run in opposite directions, and readers mix them up constantly. Form 5471 is filed by a US person who owns a piece of a foreign corporation, your Canadian company. Form 5472 is filed chiefly by a US corporation that is at least 25% foreign-owned, reporting its transactions with related parties under IRC 6038A, and its penalty is $25,000 per year rather than $10,000. So a US resident holding a Canadian corporation is in 5471 territory, while a Canadian resident holding a US corporation is in 5472 territory.

What should I do next?

Three moves, in order. Confirm your category for each year you’ve held the shares as a US person, using the five functions above. If any year is missing, pick the route, DIIRSP where the tax was right, streamlined where it wasn’t and the failure was non-willful, and file every open year at once rather than only the newest. And if you’re keeping the corporation mostly out of inertia, weigh that against winding it up before you build up years more of filings.

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