Your green card makes you a U.S. tax resident who reports worldwide income on Form 1040, while your EU company follows the corporation, partnership, or disregarded-entity branch that U.S. classification rules assign.

A resident alien's income is generally subject to tax in the same manner as a U.S. citizen. If you are a resident alien, you must report all interest, dividends, wages, or other compensation for services, income from rental property or royalties, and other types of income on your U.S. tax return. You must report these amounts whether from sources within or outside the United States. Resident aliens file Form 1040 like U.S. citizens.

(b)(2)(i), (c)(1)(i)

Except as provided in paragraph (b)(3) of this section, unless the entity elects otherwise, a foreign eligible entity is— A partnership if it has two or more members and at least one member does not have limited liability; An association if all members have limited liability; or Disregarded as an entity separate from its owner if it has a single owner that does not have limited liability.

Categories 4 and 5; When and Where To File; Penalties

For purposes of Category 4, a U.S. person has control of a foreign corporation if, at any time during that person’s tax year, it owns stock possessing: 1. More than 50% of the total combined voting power of all classes of stock of the foreign corporation entitled to vote, or 2. More than 50% of the total value of shares of all classes of stock of the foreign corporation. Owns (directly, indirectly, or constructively, within the meaning of section 958(a) and (b)) 10% or more of the total combined voting power or value of shares of all classes of stock of a CFC. Attach Form 5471 to your income tax return (or, if applicable, partnership or exempt organization return) and file both by the due date (including extensions) for that return. A $10,000 penalty is imposed for each annual accounting period of each foreign corporation for failure to furnish the information required by section 6038(a) within the time prescribed.

(a); 2025 amendment effective-date note

Each person who is a United States shareholder of any controlled foreign corporation for any taxable year of such United States shareholder shall include in gross income such shareholder's net CFC tested income for such taxable year. Amendment by section 70354(b) of Pub. L. 119–21 applicable to taxable years of foreign corporations beginning after Dec. 31, 2025, see section 70354(c) of Pub. L. 119–21, set out as a note under section 951 of this title.

(a)

(1) the tax imposed under this chapter on amounts which are included in his gross income under section 951(a) shall (in lieu of the tax determined under sections 1 and 55) be an amount equal to the tax which would be imposed under section 11 if such amounts were received by a domestic corporation, and (2) for purposes of applying the provisions of section 960 ¹ (relating to foreign tax credit) such amounts shall be treated as if they were received by a domestic corporation.

Categories of Filers; When and Where To File

A Category 1 filer is a U.S. person who controlled the foreign partnership at any time during the partnership’s tax year. Control of a partnership is ownership of more than a 50% interest in the partnership. Attach Form 8865 to your income tax return (or, if applicable, partnership or exempt organization return) and file both by the due date (including extensions) for that return.

(a)

In determining his income tax, each partner shall take into account separately his distributive share of the partnership's—

Who Must File; When and Where To File

A U.S. person that is directly a tax owner of an FDE or operates an FB at any time during the U.S. person's tax year or annual accounting period. Form 8858 is due when your income tax return or information return is due, including extensions.

(a)

A business entity with only one owner is classified as a corporation or is disregarded; if the entity is disregarded, its activities are treated in the same manner as a sole proprietorship, branch, or division of the owner.

Who Should File

File Form 1116 to claim the foreign tax credit if the election, earlier, doesn’t apply and: You are an individual, estate, or trust; and You paid or accrued certain foreign taxes to a foreign country or U.S. territory.

Generally, the following four tests must be met for any foreign tax to qualify for the credit: The tax must be imposed on you You must have paid or accrued the tax The tax must be the legal and actual foreign tax liability The tax must be an income tax (or a tax in lieu of an income tax)

The effect of tax treaties

Tax treaties generally reduce the U.S. taxes of residents of foreign countries as determined under the applicable treaties. With certain exceptions, they do not reduce the U.S. taxes of U.S. citizens or U.S. treaty residents. U.S. citizens and U.S. treaty residents are subject to U.S. income tax on their worldwide income.

Source of Income Salaries, wages, and other compensation for personal services. Where services are performed.

Reporting Thresholds; When and How To File

If you are not married, you satisfy the reporting threshold only if the total value of your specified foreign financial assets is more than $50,000 on the last day of the tax year or more than $75,000 at any time during the tax year. If you are married and you and your spouse file a joint income tax return, you satisfy the reporting threshold only if the total value of your specified foreign financial assets is more than $100,000 on the last day of the tax year or more than $150,000 at any time during the tax year. Filing Form 8938 does not relieve you of the requirement to file FinCEN Form 114, Report of Foreign Bank and Financial Accounts (FBAR), if you are otherwise required to file the FBAR.

A United States person that has a financial interest in or signature authority over foreign financial accounts must file an FBAR if the aggregate value of the foreign financial accounts exceeds $10,000 at any time during the calendar year.

When to File

You're allowed an automatic extension to October 15 if you fail to meet the FBAR annual due date of April 15.

Who Must File; Due Date

A foreign corporation must file Form 1120-F if, during the tax year, it: Engaged in a U.S. trade or business (USTB) with effectively connected income (ECI). A foreign corporation that performs services in the United States for any period of time is generally treated as engaged in U.S. trade or business. With a U.S. office or place of business - File by the 15th day of the 4th month after the end of the tax year. Without a U.S. office or place of business - File by the 15th day of the 6th month after the end of the tax year.

Individuals employed within the United States by a foreign employer are generally subject to Social Security and Medicare tax withholding by the foreign employer. However, individuals employed in the United States by a foreign employer may be exempt from U.S. Social Security and Medicare taxes under the terms of a totalization agreement.

Foreign Earned Income Exclusion

To claim these benefits, you must have foreign earned income, your tax home must be in a foreign country, and you must be one of the following: A U.S. resident alien who is a citizen or national of a country with which the United States has an income tax treaty in effect and who is a bona fide resident of a foreign country or countries for an uninterrupted period that includes an entire tax year, or A U.S. citizen or a U.S. resident alien who is physically present in a foreign country or countries for at least 330 full days during any period of 12 consecutive months.

General Rule; Payment Due Dates

In most cases, you must pay estimated tax for 2026 if both of the following apply. You expect to owe at least $1,000 in tax for 2026, after subtracting your withholding and refundable credits. 3rd payment . . . . . . . . . . . . . . . . . Sept. 15, 2026. 4th payment . . . . . . . . . . . . . . . . . Jan. 15, 2027.

If you need more time to file your taxes, request an extension by the April tax filing due date. This gives you until October 15 to file without penalties. Make sure you pay any tax you owe by the April filing date. The extension is only for filing your return.