For US persons who own businesses abroad, no filing looms larger than Form 5471 — the information return for US owners and officers of foreign corporations. It is long, it is technical, its penalty is automatic, and behind it stands the machinery that can tax a foreign company’s profits to its American owner before a single dollar is distributed.

If you are a US citizen or green card holder with a Hong Kong limited company, a Canadian CCPC, a Singapore Pte Ltd, a Japanese KK — or a meaningful stake in any non-US corporation — this is the part of the tax code aimed at you.

Who must file

Form 5471 has five filer categories, but the common triggers are practical:

  • You acquire or dispose of a 10% stake in a foreign corporation;
  • You are an officer or director of one in which a US person acquires such a stake;
  • You control a foreign corporation (more than 50%);
  • You own 10% or more of a controlled foreign corporation (CFC) — a foreign company more than half owned, by vote or value, by 10%-plus US shareholders.

The owner-managed company is the classic case: an American who owns 100% of a local business files Form 5471 in the fullest category, every year, with financial statements translated into US accounting concepts, related-party transaction schedules, and earnings-and-profits calculations attached.

The penalty mathematics

Failing to file a required 5471 — or filing one that is “substantially incomplete” — carries an automatic US$10,000 penalty per form, per year, rising by US$10,000 increments (to a US$60,000 ceiling per form-year) if not cured after IRS notice. Ten years of an unfiled 5471 for one company is six figures of exposure before any actual tax enters the conversation. An unfiled 5471 also keeps the statute of limitations open on your entire income tax return for those years.

These penalties attach to an information return. They are the reason foreign-company reporting should never be improvised.

The substance: CFC anti-deferral

The form is only the visible part. If your company is a CFC, two regimes can tax you personally on its undistributed earnings:

  • Subpart F — taxes US shareholders currently on the company’s passive and mobile income: investment income, certain related-party sales and services income. The family investment holding company is squarely targeted.
  • GILTI — since 2018, taxes US shareholders currently on most of the company’s active earnings above a routine return on its tangible assets. (2025 legislation revised this regime — including renaming it net CFC tested income — with changes generally taking effect from 2026; owners should expect recalibrated numbers, not relief from the concept.) For a services or trading company in low-tax Hong Kong or Singapore, this regime, not Subpart F, is usually the live issue.

The combined effect: “I’ll leave the profits in the company and deal with US tax later” has not been a viable strategy since 2017.

The levers that change the outcome

The regime is harsh by default but responsive to planning:

  • Section 962 election — lets an individual shareholder be taxed on CFC income as if a US corporation, gaining the corporate rate and a credit for foreign corporate taxes. In high-tax Canada this can nearly neutralise GILTI; in low-tax Hong Kong it helps less but still matters.
  • Check-the-box election (Form 8832) — many wholly-owned foreign companies can elect to be disregarded for US purposes, swapping the CFC regime for direct flow-through taxation plus a (simpler) Form 8858. Frequently the cleanest structure for solo owners — though it must be weighed against local tax and the exit consequences, and timing the election badly can itself trigger tax.
  • Salary vs retention — paying yourself salary (sheltered by the foreign earned income exclusion where available) rather than accumulating corporate profit changes both the GILTI base and the personal picture.
  • High-tax exceptions — earnings taxed locally above a threshold rate can be excluded from the anti-deferral base; decisive for Canadian-rate companies, useless for Hong Kong-rate ones.

Which lever fits is a numbers question — owner’s residence country, corporate tax rate, profit level, distribution needs — and the answer differs sharply between a consultant in Toronto and one in Singapore.

If filings have been missed

Unfiled 5471s surface constantly — typically when an owner first learns the rules exist. The repair route depends on the wider picture: the Streamlined Filing Compliance Procedures (which require the missed 5471s inside the package), delinquent information return submissions with reasonable-cause statements where income was otherwise reported, or penalty abatement where notices have already issued. The wrong move is filing years of back 5471s cold, with no strategy and no narrative.

The practical takeaway

A foreign company in US hands is a permanent compliance commitment: an annual 5471 built from real books, an annual anti-deferral calculation, and a structure that was chosen, not inherited by default. Set up properly, it is routine. Left unexamined, it is the most expensive blind spot in international US tax — we see the proof weekly.