Estonian Company with a US Owner: CFC Rules

Many Americans become e-residents and form or buy an Estonian private limited company (OÜ). For a US owner the main question is not where the company is managed — US law classifies a corporation by where it was organised — but what the owner must include in income and report each year. This guide sets out the US rules that matter, with the official text of the Internal Revenue Code, what the Estonia–United States tax treaty says, and what we do on the Estonian side.

The guide is general information, not tax advice. How you and your company are taxed depends on the facts of your case, including how the company is classified for US tax purposes; ask a US tax adviser before you form or buy the company. Title 26 of the United States Code was read in the 2024 edition on govinfo.gov, and the treaty in the text published by the IRS, on 21 October 2026.

In Estonia: an Estonian company is Estonian

A company established under Estonian law is resident in Estonia for tax purposes (Income Tax Act § 6). Its profit is taxed when it is distributed, not while it stays in the company — the guide how Estonia taxes company profit explains the rule. The company keeps its Estonian duties wherever its owners live: accounts, an annual report to the commercial register and, if its address is abroad, a contact person in Estonia.

In the United States: a foreign corporation, and the owner's duties

Foreign by place of organisation. A corporation is domestic when it is created or organised in the United States or under US or state law; any other corporation is foreign (26 U.S.C. § 7701(a)(4) and (5)). An OÜ organised under Estonian law that is treated as a corporation for US tax purposes is therefore a foreign corporation, wherever its owner manages it from.
Controlled foreign corporation. A foreign corporation is a controlled foreign corporation (CFC) if more than 50 percent of its voting power or of the value of its stock is owned by United States shareholders (§ 957(a)); a United States shareholder is a US person who owns 10 percent or more of the voting power or of the value (§ 951(b)). So if the OÜ is treated as a corporation, a single American owner makes it a CFC.
Income without a distribution. Every United States shareholder of a CFC includes in gross income his or her pro rata share of the corporation's subpart F income and certain other amounts for the year, whether or not anything is paid out (§ 951(a)(1)).
Information return. A US person who controls a foreign business entity must furnish the information the Treasury prescribes — among it the entity's balance sheet and its transactions with the owner (§ 6038(a)); the penalty for not furnishing it is USD 10,000 for each annual accounting period (§ 6038(b)(1)).

What the Estonia–United States tax treaty says

US citizens. Notwithstanding the other provisions of the treaty, the United States may tax its residents and, by reason of citizenship, its citizens as if the treaty had not come into effect (convention signed at Washington on 15 January 1998, article 1(4), the "saving clause"); the exceptions are listed in article 1(5).
Permanent establishment. A permanent establishment is a fixed place of business through which the enterprise's business is wholly or partly carried on; it includes especially a place of management, a branch and an office (article 5(1) and (2)). The business profits attributable to it may be taxed in the state where it is (article 7(1)).
Dividends. Dividends paid by an Estonian company to a US resident may be taxed in the United States; if Estonia also taxes them at source, the treaty limits that tax to 5 percent for a company holding directly at least 10 percent of the voting shares and 15 percent in other cases (article 10(1) and (2)).

What to decide before you form or buy the company

How the company will be classified in the US — your US tax adviser will tell you which classification applies to an OÜ and whether an election makes sense.
Who owns it. With one or more US owners holding more than 50 percent, plan for the CFC rules and the yearly information return from the first year.
Where the work is done. An office or other fixed place of business in the US can be a permanent establishment.

What we do on the Estonian side

online formation for an e-resident — €950 Registered address and contact person service for one year are included., or formation by power of attorney — €1,250;
a ready-made company bought remotely — €1,200 Registered address and contact person service for one year are included.;
accounting — from €150 / month and the annual report — from €450 (the Estonian balance sheet and accounts are what the US information return is prepared from);
the registered address and contact person after the first 12 months — €350 / year.

Our accounting covers the Estonian company's Estonian obligations. US tax returns, the information return and US tax advice are not included. Owners in other countries: Estonian company run from abroad compares the rules side by side.

Prices exclude VAT. All communication takes place by email.

Ready to start? A new Estonian company — online for e-residents or by power of attorney; US tax advice is not included. Order.

Official sources

The laws this article names, by the name of their official text, as read on 9 October 2026. For the Estonian acts we read the English translation in Riigi Teataja; the legally binding text is the Estonian one.

Income Tax Act — Riigi Teataja, English translation

Sources are named in the text, without links. To see which of our services your company needs, open the Business Navigator.

Frequently asked questions

I am a US citizen — how is my Estonian company treated for US tax?

For US tax law a corporation organised outside the United States is foreign, wherever it is managed from (26 U.S.C. § 7701(a)(4) and (5)). If the OÜ is treated as a corporation and US shareholders own more than 50 percent, it is a controlled foreign corporation (§ 957(a)); each US shareholder of 10 percent or more includes his or her share of certain income in gross income for the year even without a distribution (§ 951(a)(1), (b)), and a US person who controls it files an information return — the penalty for not filing is USD 10,000 per year (§ 6038). Under the Estonia–US treaty the United States may tax its citizens as if the treaty had not come into effect (article 1(4)). Ask a US tax adviser before you form or buy the company; we handle the Estonian side.

Estonian company with a US owner: what US tax law asks