Estonia's most famous advantage is simple: profit is not taxed until you take it out of the company. For an American citizen or a green card holder that rule mostly does not work — and the paperwork only grows. What follows is a direction only, not tax advice. Before you make any decisions, speak with a US cross-border tax adviser (CPA) who has filed Form 5471 themselves.
The 0% disappears
Estonia taxes only the profit that is taken out. The Income Tax Act starts from the moment of distribution: "A resident company /…/ pays income tax on profit distributed as dividends or other profit distributions upon payment thereof" (Income Tax Act § 50 subsection 1, riigiteataja.ee).
The United States, however, does not wait. If Americans together own more than 50% of the shares, the US treats your company as a controlled foreign corporation (CFC). The US rules (Subpart F / GILTI) may then tax the company's profit on your US tax return already in the year it is earned — even if you have taken nothing out. Estonia waits for the money to be taken out; the US does not. That is how the famous 0% disappears.
Two forms you must not forget
Form 5471. A US person who owns at least 10% of a foreign company generally files Form 5471. It is not a tax but an information form. But if you do not file the form, file it late or fill it in incompletely, the penalty is 10,000 dollars per form and per year. The penalty comes even if the company earned nothing. After you receive a notice from the IRS, another 10,000 dollars is added for every 30 days, up to 50,000 dollars.
FBAR (FinCEN Form 114). If the foreign accounts of a US person exceed 10,000 dollars in total at any moment during the year, an FBAR has to be filed. The company's Estonian bank account counts if you have signature authority over it.
The treaty does not save you
The tax treaty between the United States and Estonia is in force and prevents ordinary double taxation. But the so-called saving clause of the treaty (article 1 paragraph 4) leaves the US the right to tax its own citizens and residents as if the treaty did not exist. This means that the treaty does not cancel the CFC and GILTI rules, and it does not bring back the Estonian deferral of tax.
The lever: check-the-box (Form 8832)
US law allows a single owner to choose that their company is treated as transparent for US purposes (a disregarded entity). That may take a single owner out of the corporate Form 5471 duty. Estonia still taxes the company as an Estonian company — this choice on the US side changes nothing in Estonia. The choice has to be made at the right time and it binds you for 60 months, so decide early, together with a US CPA.
Is an Estonian company the right tool at all?
If the only reasons for an Estonian company are "0% tax" or "privacy", then a US person gets neither, and a US LLC is usually simpler. An Estonian company pays off only for a real European reason. For example, when you have European clients who need a European seller, or when you need European operations and payment solutions.
This article was prepared with the help of artificial intelligence.