Non-Resident & Foreign-Owner Tax FAQs

Guidance for non-resident individuals and foreign-owned US businesses

1.Does a Non-Resident Alien need to file a US tax return?

Generally, yes, if you earned US-source income — such as wages, rental income, or business income effectively connected with a US trade or business. Filing requirements can also apply even without a physical US presence, depending on the type and source of income received. We evaluate your specific income streams and residency status to determine exactly what's required.

2.What is the difference between Form 1040 and Form 1040-NR?

Form 1040 is used by US citizens and resident aliens to report worldwide income, while Form 1040-NR is used by non-resident aliens to report only income connected to the United States. The two forms have different rules around deductions, credits, and tax rates, so filing the wrong one can lead to overpaying or underreporting. We determine your correct residency status under IRS rules before selecting the appropriate form.

3.How do I know if my income is ECI or foreign-source income? (This confuses almost everyone)

Start with clear definitions, because the two terms get mixed up constantly. Effectively Connected Income (ECI) is US-source income that's connected to a US trade or business — meaning you have a US office, warehouse, or a dependent agent working mainly for you, and the income comes from work performed or goods sold inside the US. Foreign-source income is income you earn by performing work or delivering services entirely from outside the US — even if every single client paying you is American. Having US customers, US clients, or a US-registered LLC does not, by itself, create ECI; what actually matters is where the work happens or where goods change ownership. Example: a marketing consultant in India who serves only US clients but does all the work from home earns foreign-source income and owes no US federal income tax on it. An Amazon FBA seller who stores inventory in a US warehouse and ships to US buyers earns US-source income that is typically taxed as ECI. Once you know which bucket you're in, here's which form(s) you actually file:

• Foreign-source income, single-member LLC — File Form 5472 with a pro forma Form 1120 every year, even though no US tax is owed.
• ECI, single-member LLC — File Form 5472 + pro forma Form 1120, and report and pay tax on the ECI using Form 1040-NR.
• Foreign-source income, multi-member LLC (partnership) — File Form 1065, issue each partner a Schedule K-1, and attach Schedules K-2/K-3 to report items of international tax relevance to foreign partners.
• ECI, multi-member LLC (partnership) — File Form 1065 with K-1s and K-2/K-3s, file Forms 8804/8805 for Section 1446 withholding on the ECI, and each foreign partner separately files their own Form 1040-NR.

Because the line between ECI and foreign-source income often comes down to the specific facts of your operations, we review your business model in detail before confirming your status and the exact forms that apply.

4.Do foreign-owned US businesses need to file Form 5472?

Yes. A US corporation that is at least 25% foreign-owned, as well as certain foreign-owned single-member LLCs treated as disregarded entities, must file Form 5472 along with a pro forma Form 1120 to report transactions with foreign owners and related parties. This filing is required even if the business had no income or activity during the year. Penalties for missing this filing start at $25,000 per form, so it's one of the first things we check for foreign-owned clients.

• Key takeaway — Zero income doesn't mean zero paperwork — Form 5472 is due every year the LLC has reportable transactions, income or not.

5.Does a non-resident need an ITIN, and how long does it take?

A non-resident who isn't eligible for a Social Security Number but has a US filing or reporting requirement generally needs an Individual Taxpayer Identification Number (ITIN) to file a return or be listed on one. Processing typically takes seven to eleven weeks when filed with the IRS directly, and can take longer during peak filing season or when applying from outside the US. We help prepare the Form W-7 application and supporting documentation to reduce the chance of delays or rejections.

6.What taxes apply to foreign-owned US LLCs and businesses?

Foreign-owned US LLCs may owe federal income tax on income effectively connected with a US trade or business, along with applicable state income, sales, and franchise taxes. Depending on structure, there may also be branch profits tax, withholding tax on certain payments, and required informational filings such as Form 5472. The right tax outcome depends heavily on entity structure and treaty eligibility, which we review as part of onboarding foreign-owned clients.

7.How do tax treaties affect my US filing obligations as a non-resident?
The US has income tax treaties with many countries that can reduce or eliminate withholding tax, provide reduced tax rates, or prevent the same income from being taxed twice. Claiming treaty benefits usually requires filing specific forms, such as Form W-8BEN or attaching a treaty-based return position disclosure to your tax return. We review the treaty between the US and your home country to identify benefits you may be entitled to and ensure they're claimed correctly.

Updated on: 21/08/2026