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U.S. Tax Guide for Foreign-Owned C Corporations: Form 1120, Form 5472 and Related-Party Transactions

A U.S. C corporation owned 25 percent or more by a foreign person files Form 1120 and Form 5472 every year, pays 21 percent federal tax, and must price transactions with its foreign owners at arm's length.

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Quick answer

A C corporation formed in the United States is a U.S. taxpayer even when its shareholders are foreign. It files Form 1120 each year and pays federal income tax at 21 percent on its taxable income. If one foreign person owns at least 25 percent of the vote or value, it also attaches Form 5472 for each foreign or U.S. related party with which it had reportable transactions. Payments to the foreign owners — dividends, interest, royalties, management fees — carry withholding and documentation requirements.

Who this applies to

  • U.S. subsidiaries of foreign companies
  • U.S. corporations owned by foreign individuals
  • LLCs owned by foreign persons that elected corporate treatment

Core federal filings

  • Form 1120: due the 15th day of the 4th month after year-end (April 15 for calendar years); Form 7004 extends six months
  • Form 5472: attached to Form 1120, one per related party with reportable transactions
  • Forms 1042 and 1042-S: due March 15, reporting U.S.-source payments to foreign persons and tax withheld
  • Form 1099 and payroll filings for U.S. contractors and employees
  • State income or franchise tax returns — Florida, for example, imposes a 5.5 percent corporate income tax above a $50,000 exemption

Related-party transactions

Form 5472 reports sales, purchases, services, rents, royalties, loans, interest and other amounts exchanged with related parties. The corporation must keep records sufficient to establish the correct treatment of those transactions. Under section 482, prices between related parties must be consistent with what unrelated parties would agree. Intercompany agreements and transfer pricing documentation help support deductions and avoid penalties.

Example

A Spanish company forms a Delaware subsidiary to distribute its products in the U.S. The subsidiary buys inventory from the parent, pays a trademark royalty, and borrows $500,000 from the parent. Each flow is reported on Form 5472. The royalty and interest are U.S.-source payments to a foreign person that require withholding at 30 percent unless the U.S.–Spain treaty reduces it, with a Form W-8BEN-E from the parent. The purchase price and interest rate must be arm's length.

Paying the foreign owner

Distributions out of earnings and profits are dividends subject to 30 percent withholding, often reduced by treaty to 5 or 15 percent depending on ownership. Interest paid to a related foreign lender may be subject to withholding and to the business interest limitation of section 163(j). Large related-party payments can also raise the base erosion and anti-abuse tax (BEAT) for corporations with average annual gross receipts of $500 million or more.

Penalties

Failure to file Form 5472 or to maintain required records carries a $25,000 penalty per form per year, with an additional $25,000 for each 30-day period the failure continues after IRS notice. Failure to withhold on payments to foreign persons can make the corporation liable for the tax itself, plus penalties and interest.

C corporation vs. LLC

A C corporation isolates U.S. business income at the corporate level and often simplifies the owner's U.S. filings, but profits paid out as dividends are taxed again through withholding. A foreign-owned LLC avoids the corporate layer but may require the owner to file a U.S. return. The right choice depends on the business model, treaty position and home-country rules.

Key takeaways

  • A U.S. corporation is taxed on its worldwide income at a 21 percent federal rate, regardless of who owns it.
  • A corporation 25 percent foreign-owned files Form 5472 for each foreign related party with reportable transactions.
  • Dividends paid to foreign shareholders generally require 30 percent withholding, reduced by treaty, reported on Forms 1042 and 1042-S.
  • Related-party pricing must follow the arm's-length standard of section 482.
  • The Form 5472 penalty is $25,000 per form per year.

Frequently asked questions

Does my foreign-owned corporation need to file if it had no income?

Yes. A U.S. corporation files Form 1120 every year it exists, and Form 5472 whenever it had reportable transactions with a related party.

What counts as 25 percent foreign-owned?

At least one foreign person owning, directly or indirectly through attribution rules, 25 percent of the total voting power or total value of all classes of stock at any time during the year.

Do I need transfer pricing documentation?

Contemporaneous documentation is not always mandatory, but having it can protect against section 6662 penalties if the IRS adjusts related-party prices.

Can the foreign owner be paid a salary?

Compensation for services performed in the U.S. is U.S.-source and subject to wage withholding; services performed abroad are generally foreign-source. Immigration status also matters.

Is a loan from the parent treated as debt?

Only if it has the characteristics of genuine debt, such as a written note, fixed repayment terms and market interest. Otherwise the IRS may recharacterize it as equity.

Does the corporation need to file BOI reports?

Under FinCEN's March 2025 interim final rule, U.S.-formed companies are exempt. Confirm current guidance, since this area has changed repeatedly.

Sources and official references

Educational information only

This article provides general educational information and should not be considered tax, legal, accounting, or investment advice. Tax consequences depend on each taxpayer's specific circumstances.

Written by Roger I. Chirino

Chirino USA tax professionals

Our educational resources are supported by experienced U.S. tax and accounting professionals.

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A U.S. C corporation owned 25 percent or more by a foreign person files Form 1120 and Form 5472 every year, pays 21 percent federal tax, and must price transactions with its foreign owners at arm's length.

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