US Tax and IRS Compliance Questions for Foreign-Owned Companies
14 practical answers
Last reviewed October 7, 2026
US tax compliance for a foreign-owned company starts with one question: how is the entity classified for federal tax? A single-member LLC owned by a non-US person is usually disregarded for income tax but still files Form 5472 with a pro forma Form 1120. A multi-member LLC generally files Form 1065 as a partnership, and a C-Corp files Form 1120 and pays corporate tax. From there, deadlines, extensions, related-party reporting and state obligations follow.
The typical journey for a non-US founder is to discover the filing requirement after the first year, gather bank records, classify money moved between owner and company, and file on time or with a Form 7004 extension. This hub is organized around that path: which return applies, related-party reporting, deadlines and missed filings, federal versus state tax, and records and deductions. Each answer states the general rule and the facts that change it. NYBACS coordinates filings with qualified tax professionals; the answers here are general information, not tax advice for your situation.
Which federal return does your company file?
How entity type and ownership decide between a pro forma 1120 with Form 5472, Form 1065 and a full Form 1120, including in years with no income.
Does a Foreign-Owned US LLC Need to File a Tax Return?
Yes — in almost every year. Which return depends on how the IRS classifies the LLC: a single-member LLC owned by a non-US person files Form 5472 attached to a pro forma Form 1120; a multi-member LLC files Form 1065 as a partnership; an LLC that elected corporate treatment files a full Form 1120. The owner may also need a personal or corporate US return if the LLC earns US effectively connected income.
Does a Foreign-Owned US LLC Need to File if There Is No Income?
Usually yes. A single-member LLC owned by a non-US person must file Form 5472 with a pro forma Form 1120 whenever it has a reportable transaction with its owner — and funding the LLC or paying its formation fees counts, even with zero revenue. A multi-member LLC can skip Form 1065 only if it had no income and no deductible expenses at all. An LLC taxed as a C-Corp must file Form 1120 regardless.
When Does a US LLC Need to File Form 1065?
A US LLC files Form 1065 when it has two or more members and has not elected to be taxed as a corporation — the default partnership classification. The return is due by the 15th day of the third month after year-end (March 15 for calendar-year LLCs), issues a Schedule K-1 to each member, and must be filed unless the LLC had no income and no deductible expenses. Foreign members add withholding and extra reporting obligations.
When Does a US C-Corp Need to File Form 1120?
Every year. Unless it is a tax-exempt organization, every domestic corporation — including an LLC that elected corporate treatment — must file Form 1120 whether or not it has taxable income. The return is due by the 15th day of the fourth month after year-end (April 15 for a calendar year), can be extended six months with Form 7004, and must include Form 5472 when a foreign person owns 25% or more of the company.
Form 5472 and owner-to-company transactions
What the IRS treats as a reportable related-party transaction and how money from a foreign owner should be classified.
What Is Form 5472 for a Foreign-Owned US LLC?
Form 5472 is an IRS information return that a single-member US LLC owned by a non-US person must file every year it has a reportable transaction with its owner or another related party — including the owner's capital contributions, loans, distributions and payment of formation costs. It is attached to a pro forma Form 1120, cannot be e-filed, and missing it carries a $25,000 penalty per form.
What Is a Pro Forma Form 1120 and Why Is It Filed With Form 5472?
A pro forma Form 1120 is a mostly blank corporate tax return that serves as the cover document for a foreign-owned disregarded LLC's Form 5472. It is not a tax computation: only the LLC's name, address, EIN (item B) and the return-type checkboxes (item E) are completed, with "Foreign-owned U.S. DE" written across the top. It exists because the IRS needs a return to attach Form 5472 to and to establish a filing date.
What Are Reportable Transactions Between a Foreign Owner and a US LLC?
Reportable transactions are any transfers of money, property or services between a foreign-owned US LLC and a related party — the owner, the owner's family members, or companies under common control. They include capital contributions, distributions, loans and repayments, reimbursements, expenses the owner pays personally for the LLC, and payments to or from the owner's other businesses. Each must be identified, valued in US dollars and reported on Form 5472.
Is Money Sent by a Foreign Owner to a US Company Income?
Generally no. Money a foreign owner puts into a US company to fund it is either a capital contribution or a loan, and neither is taxable income to the company. It becomes income only when it is actually payment for something the company provides — for example, the owner's foreign company paying the US entity for services or goods. The classification must be decided and documented at the time, because it affects tax reporting, withholding and bank reviews.
Deadlines, extensions and missed filings
How Form 7004 extensions work for foreign-owned entities and what to do when an IRS deadline has already passed.
Can a Foreign-Owned US Company File a Tax Extension?
Yes. A foreign-owned US company can get an automatic six-month extension of its federal filing deadline by submitting Form 7004 on or before the original due date — no reason or signature is needed. It works for Form 1120, Form 1065 and the pro forma Form 1120 that carries Form 5472. It extends only the time to file: any tax due must still be paid by the original deadline, and state returns may need separate extensions.
What Happens if a US Company Misses Its IRS Filing Deadline?
Penalties start to accrue, and their size depends on which return was missed. A C-Corp's late Form 1120 is penalized as a percentage of unpaid tax, so a zero-tax year may cost little; a multi-member LLC's late Form 1065 costs a fixed amount per member per month; and a missing Form 5472 carries a $25,000 penalty regardless of tax. Filing quickly, paying any tax and requesting relief where it is available limits the damage.
Federal versus state tax obligations
Why a federal return does not cover state franchise, income and annual-report obligations, including for Delaware companies operating elsewhere.
What Is the Difference Between Federal Tax Filing and State Tax Filing in the US?
Federal filings go to the IRS and apply the same rules nationwide, based on the company's tax classification. State filings go to each state where the company is formed, registered or has nexus, and each state sets its own taxes, forms and deadlines — income, franchise, gross receipts, annual report or flat fees. A company can owe nothing federally and still owe state tax, and vice versa.
Does a Delaware Company Need to File Taxes Outside Delaware?
Often, yes. Forming in Delaware decides where the company exists, not where it is taxed. A Delaware company that has employees, an office, inventory, or sufficient sales in another state — New York, California or Texas, for example — generally has to register there and file that state's income, franchise or sales tax returns. Delaware itself still charges its annual franchise tax or LLC tax, even when the company does no business in Delaware.
Tax records and deductible costs
The records a foreign-owned company should keep to support its returns and how formation and professional fees are treated.
What Tax Records Should a Foreign-Owned US Company Maintain?
A foreign-owned US company should keep every record needed to support its returns: bank and payment-processor statements, invoices and receipts, contracts, payroll files, fixed-asset records, filed returns, and — specifically because of foreign ownership — evidence of every transaction with the foreign owner and related companies. General IRS guidance is to keep records at least three years after filing, longer in many situations, and records supporting Form 5472 must be available to the IRS on request.
Can a US Company Deduct Formation and Professional Fees?
Yes, but not always immediately. Formation costs (organizational costs) and pre-opening start-up costs can each be deducted up to $5,000 in the year the business begins, reduced once that category exceeds $50,000, with the rest amortized over 180 months. Ongoing legal, accounting and tax-preparation fees after the business starts are generally deductible in the year incurred. Costs of issuing shares or raising capital are not deductible at all.
Common questions
Featured Questions
Which IRS return does a foreign-owned US company file?
A single-member LLC owned by a non-US person generally files a pro forma Form 1120 with Form 5472. A multi-member LLC taxed as a partnership files Form 1065, and a C-Corp, or an LLC that elected corporate treatment, files Form 1120, adding Form 5472 if it is at least 25% foreign-owned. The classification on the company's EIN record and any elections made decide which applies.
When are US business tax returns due for a calendar-year company?
Form 1065 is generally due on the 15th day of the third month after year-end (March 15 for a calendar year), and Form 1120, including a pro forma 1120 with Form 5472, on the 15th day of the fourth month (April 15). Form 7004 filed by the original due date extends the time to file, but not the time to pay any tax owed.
Does the US tax the profits of a foreign-owned LLC?
It depends on whether the income is effectively connected with a US trade or business, which turns on where the work is done, who does it and whether US staff, offices or agents are involved. A tax treaty between the US and the owner's country can also change the result. Because the owner may have a personal or foreign-corporate US filing even when the LLC only files Form 5472, this is worth reviewing on the actual facts.
Is filing the federal return enough to stay compliant?
No. States run their own systems: the state of formation may charge franchise tax or require an annual report, and states where the company has employees, offices or significant sales may require registration, income or franchise tax returns and sales tax filings. Federal and state calendars should be tracked together.
Questions about US Tax & IRS?
Book a NYBACS tax filing review to confirm which returns your company owes, organize the records behind them and file or extend on time, including any missed prior years.
