I live outside the United States and own a US LLC — how is it taxed?

A US LLC owned by a non-resident is taxed by its classification: a single-member LLC owned by a foreign individual is disregarded for income tax but must file an information return reporting transactions with its owner, and the owner is taxed in the US only on income effectively connected with a US business or certain US-source income. Treaties, withholding on owner payments, and the branch-versus-corporation choice change the answer.

Key points

A single-member US LLC owned by a non-resident individual is a disregarded entity for income tax, but it must still file Form 5472 with a pro forma Form 1120 each year.
A non-resident owner is taxed by the United States only on income effectively connected with a US trade or business and on certain US-source income such as interest, dividends, rents, and royalties.
Missing the Form 5472 filing carries a substantial fixed penalty per return regardless of whether any US income tax is owed.
A tax treaty between the United States and the owner's country of residence can reduce US tax on certain income and raise the threshold at which a business presence becomes taxable.
Electing to have the LLC taxed as a corporation instead of a disregarded branch changes how profits are taxed, distributed, and withheld on.

How is a foreign-owned single-member LLC classified for US tax?

The accurate picture starts with how the LLC is classified for tax, because the LLC itself is just a legal shell. A single-member LLC owned by a foreign individual is, by default, a disregarded entity for income tax. The LLC is not a separate taxpayer; its activity is treated as the owner's directly.

Disregarded does not mean invisible. Under section 6038A, a foreign-owned disregarded LLC is treated as a corporation for information-reporting purposes and must file Form 5472, attached to a pro forma Form 1120, each year reporting its transactions with its foreign owner, including capital contributions and distributions. The penalty for missing that filing is a substantial fixed amount per return and applies whether or not any tax is owed. An LLC that owes no US income tax can therefore still have a real, non-optional filing obligation, and this is where owners most often get into trouble.

When does a non-resident owner actually owe US income tax?

Whether the owner owes US income tax turns on what the LLC does. A non-resident is generally taxed by the United States on two kinds of income under section 871: income that is effectively connected with a US trade or business, taxed at graduated rates on Form 1040-NR, and certain US-source income such as some interest, dividends, rents, and royalties, taxed at a flat rate collected by withholding.

If the LLC is genuinely carrying on a business within the United States, the profit connected to that business is taxable here and the owner files a US return to report it. If the LLC merely holds assets abroad, or its activity does not rise to a US trade or business, there may be little or no US income tax even though Form 5472 is still required. Where the line falls, meaning what counts as being engaged in a US trade or business, is a fact-heavy question and one of the central issues to resolve.

How do treaties, withholding, and entity elections change the result?

Tax treaties between the United States and the owner's country can reduce US tax on certain income and can raise the threshold at which a business presence becomes taxable, typically by requiring a permanent establishment before business profits are taxed. The owner's country of residence therefore matters a great deal, and treaty benefits are claimed on the return or through a withholding certificate.

Withholding is another layer. Under sections 1441 and 1442, certain payments from a US person to a foreign person carry a withholding obligation at source, and payments the LLC makes to its foreign owner may be caught by these rules, which means tax can be collected before a return is ever filed. The choice of how the entity is taxed, leaving it as a disregarded branch of the owner or filing Form 8832 to elect corporate treatment, changes the whole structure: how profits are taxed, how they are distributed, and what withholding applies to the distributions.

What does this answer not cover?

Multi-member LLCs owned by non-residents are partnerships by default and carry their own withholding rules on each foreign partner's share of effectively connected income. Corporate structures add the branch profits tax and dividend withholding. State-level obligations, including franchise taxes and state income tax filings, exist independently of the federal picture and depend on where the LLC is formed and operates.

The practical reality is that a foreign-owned US LLC is workable and common, but it is not a do-it-yourself arrangement. The information-return filing is mandatory regardless of tax owed, the effectively-connected-income question drives whether tax is due, and treaties and withholding reshape the result. Work through it with an advisor experienced in inbound cross-border taxation before assuming either the optimistic or the alarmed version of what you have been told.