Filing US Business Taxes as a Non-Resident Owner 2026

Non-resident aliens who own a US business have real federal — and often state — tax obligations, regardless of whether they ever set foot in the United States. The rules hinge on your entity type, your country of residence, and whether your income is "effectively connected" to a US trade or business. Get these distinctions right from the start and you avoid five-figure penalties; get them wrong and you may also trigger scrutiny of your immigration status.

Why This Matters More in 2026

The IRS has significantly expanded its data-sharing arrangements with foreign tax authorities through the Common Reporting Standard (CRS) and its own Foreign Account Tax Compliance Act (FATCA) framework. In 2026, more than 100 jurisdictions automatically exchange financial account information, which means hiding a US-source income stream in a foreign bank account is substantially harder than it was a decade ago. At the same time, the IRS has continued issuing updated guidance on foreign-owned disregarded entities and has increased audit activity around Form 5472 non-filers.

For entrepreneurs who set up a US LLC from abroad — a popular structure for e-commerce sellers, software companies, and service businesses wanting access to US payment processors and customers — the compliance landscape is more demanding than many online incorporation services disclose. The filing fee for an LLC might be $50; the penalty for failing to file a required information return can be $25,000.

Additionally, US interest rates and the continued strength of the dollar mean that profits repatriated to a foreign owner represent real purchasing power. Understanding withholding taxes and treaty reductions on those profit transfers is worth meaningful money. If you are also moving funds internationally, our guide to the Cheapest Ways to Move Money Between Countries 2026 covers transfer costs that can quietly erode your returns.

The Foundation: How the IRS Classifies Non-Resident Owners

Before discussing which forms to file, you need to understand how the IRS categorises you and your income.

Resident vs. Non-Resident for Tax Purposes

The US tax system uses two tests to determine residency: the Green Card Test and the Substantial Presence Test. If you hold a green card at any point during the tax year, you are treated as a resident alien for that entire year. If you are physically present in the US for 183 days or more under the substantial presence formula (which counts current-year days plus fractions of prior years), you are also treated as a resident and taxed on worldwide income like a US citizen.

This article is written for those who do not meet either test — people who are truly non-resident aliens (NRAs) under IRS rules. If your residency status is borderline, this is a question for a CPA, not a general guide.

Two Types of US Income for Non-Residents

This distinction is central to everything. Running a US e-commerce store? That's likely ECI. Holding shares in a US C-Corp that pays you dividends? That's FDAP, subject to withholding.

Entity Types and Their Tax Treatment

The entity structure you choose determines which tax forms you file and how income flows to you.

Single-Member LLC (Foreign-Owned, Disregarded Entity)

A single-member LLC owned 100% by a foreign individual is, by default, a disregarded entity for US tax purposes. The IRS looks through the LLC to the owner. Key obligations:

• Form 5472 + pro forma Form 1120: Required for every tax year in which the LLC has any "reportable transactions" with related foreign parties — and the IRS defines this broadly to include contributions, distributions, loans, and sales. This is filed even if the LLC has zero revenue.
• EIN: The LLC itself must have an Employer Identification Number, obtained via Form SS-4.
• Form 1040-NR: The foreign owner reports any ECI on their personal non-resident return.
• ITIN: If you have no Social Security Number, you need an Individual Taxpayer Identification Number to file Form 1040-NR.

Illustrative Example — Marta, a Polish Software Developer: Marta lives in Warsaw and incorporated a Wyoming LLC in 2025 to sell a SaaS product to US customers. Her LLC earned $48,000 in 2025. She has no employees or office in the US. Marta's CPA determines the income is ECI because she is regularly engaged in a US trade or business. She files Form 5472 (for a capital contribution she made) and Form 1040-NR, reporting $48,000 of ECI. After the standard deduction equivalent and a US–Poland tax treaty credit, her US tax bill is approximately $5,800 (illustrative only). She also pays Polish tax on the same income but claims a foreign tax credit. This is a simplified illustration; actual outcomes vary.

Multi-Member LLC (Partnership)

A multi-member LLC with at least one foreign owner is treated as a partnership by default. This triggers:

• Form 1065: The partnership return, due March 15 (calendar year). The partnership itself does not pay federal income tax.
• Schedule K-1: Each partner receives a K-1 showing their share of income, loss, deductions, and credits.
• Form 1040-NR: Each foreign partner files their own non-resident return reporting their K-1 ECI.
• Section 1446 withholding: The partnership is required to withhold and pay tax on the foreign partner's share of ECI — currently at the highest individual or corporate rate — and file Forms 8804 and 8805. This is a significant compliance burden that catches new business owners off guard.

C-Corporation

A US C-Corp owned by a foreign shareholder is a separate taxpaying entity. The corporation:

• Files Form 1120 and pays the flat 21% federal corporate rate on its net income.
• Pays dividends to the foreign shareholder, which are subject to 30% FDAP withholding (potentially reduced by treaty) reported on Form 1042-S.
• May be subject to the Branch Profits Tax if structured as a branch rather than a subsidiary.

The C-Corp structure provides a clean separation between the US entity and the foreign owner and is often preferred for investors seeking venture capital or planning to list on US exchanges.

S-Corporation

Foreign nationals who are non-resident aliens cannot be shareholders of an S-Corporation. S-Corps are restricted to US citizens and resident aliens. If a non-resident inadvertently becomes an S-Corp shareholder — for example, by inheriting shares or through a corporate restructuring — the S election is immediately terminated, converting the entity to a C-Corp with potentially significant tax consequences. This is a hard rule with no treaty override.

Key Forms at a Glance

Tax Treaties: Your Most Powerful Tool

The US maintains income tax treaties with more than 60 countries. A treaty can:

• Reduce withholding on dividends from 30% to as low as 5% (for substantial corporate shareholders) or 15% (for portfolio investors).
• Reduce or eliminate withholding on interest and royalties.
• Provide an exemption from ECI taxation if your business activity does not rise to the level of a "permanent establishment" in the US.
• Reduce or eliminate the Branch Profits Tax.

To claim a reduced withholding rate, you provide the US payer with a Form W-8BEN (individuals) or W-8BEN-E (entities) certifying your treaty country residence. To claim a treaty position on a filed return, you attach Form 8833.

Illustrative Example — Kenji, a Japanese Business Owner: Kenji owns 100% of a Delaware C-Corp that earns $200,000 in net profit. Without a treaty, his $200,000 dividend would be subject to 30% withholding, costing $60,000. Under the US–Japan income tax treaty, the withholding rate on dividends to a 100% corporate shareholder is reduced to 5%, reducing his withholding to $10,000 on the full dividend amount. This is illustrative; treaty eligibility depends on meeting the Limitation on Benefits provisions and other conditions.

Not all treaty benefits are automatic. The Limitation on Benefits (LOB) clause in most modern US treaties requires the recipient to be a "qualified person" — often meaning a genuine resident of the treaty country who is not using the treaty as a conduit. Substantive LOB analysis requires a professional review.

State Taxes: The Layer Most Guides Skip

Federal tax is only part of the picture. Every US state has its own tax regime, and non-resident ownership does not exempt you from state obligations if your business has nexus — a sufficient legal connection to that state.

Nexus can arise from:

• Having a warehouse, office, or inventory in the state
• Employing workers in the state
• Exceeding economic nexus thresholds (typically $100,000 in sales or 200 transactions in a state, following the Supreme Court's South Dakota v. Wayfair decision)

California is notorious for aggressive nexus assertions and has a minimum franchise tax of $800 per year for any LLC "doing business" in the state — even if that just means having a California customer. Texas has no corporate income tax but imposes a Franchise Tax based on revenue. New York has complex combined reporting rules.

If your business sells physical goods or digital services across the US, you likely have multi-state filing obligations. This is in addition to collecting and remitting sales tax (an entirely separate regime from income tax).

8 Common Mistakes — and How to Fix Them

1. Ignoring Form 5472 because the LLC has no revenue. Solution: The filing obligation for a foreign-owned disregarded entity exists regardless of revenue if there are any reportable transactions. Even a capital contribution from the foreign owner counts. File even with zero income — the $25,000 penalty is not proportional to profit.

2. Treating all LLC income as automatically exempt from US tax. Solution: Understand the ECI vs. FDAP distinction. If you are regularly and continuously engaged in a US trade or business, your income is ECI and taxed at graduated rates. Running an active e-commerce operation generally qualifies.

3. Failing to obtain an ITIN before the filing deadline. Solution: ITIN processing can take 7–11 weeks. Apply early using Form W-7, ideally with your first required return. You can also use a Certified Acceptance Agent (CAA) to speed the process. Without an ITIN, you cannot e-file Form 1040-NR.

4. Claiming treaty benefits without filing Form 8833. Solution: Simply receiving a reduced withholding rate is not enough. When you take a treaty-based position on a filed return, Form 8833 is required. Omitting it can result in the treaty position being disallowed.

5. Making a foreign person a shareholder of an S-Corporation. Solution: If you are forming a pass-through entity with foreign owners, use an LLC taxed as a partnership — not an S-Corp. Verify every shareholder's residency status before making any S election.

6. Forgetting Section 1446 withholding obligations in a partnership. Solution: If you are the managing partner of a multi-member LLC with foreign members, you are the withholding agent. Failure to withhold and remit on foreign partners' ECI generates penalties against the partnership, not just the foreign partner.

7. Assuming a foreign bank account hides US income from the IRS. Solution: FATCA requires foreign financial institutions to report US persons' accounts. CRS reciprocally shares data on non-US persons' accounts. Routing US business income through a foreign account and not reporting it is now a high-detection-risk strategy. Use a multi-currency account for legitimate currency management, but report all US-source income.

8. Not registering to do business in states where you have nexus. Solution: Registering as a "foreign entity" (a company formed outside a state doing business inside it) is a prerequisite for filing state returns in most states. Failing to register can result in back taxes, penalties, and interest, and may prevent your company from suing to enforce contracts in that state.

Getting Your Identification Numbers Right

Two different numbers matter here, and they serve different purposes:

ITIN (Individual Taxpayer Identification Number)

• Format: 9XX-XX-XXXX (always starts with 9)
• Issued to: individuals who have a US tax obligation but are not eligible for an SSN
• Used on: Form 1040-NR, Form W-7 application
• Does not authorise work in the US and has no immigration significance

EIN (Employer Identification Number)

• Format: XX-XXXXXXX
• Issued to: business entities
• Obtained via: Form SS-4 (foreign applicants without a US presence can call the IRS international EIN line)
• Used on: Form 1065, Form 1120, Form 5472, banking applications

You will likely need both: the EIN for your business entity and your ITIN for your personal non-resident return. Many US banks also require an EIN to open a business account — see our guide to Opening a Bank Account as a New Arrival in the US (2026) for what documents US banks typically request from foreign business owners.

Moving Profits Back Home

Once you have met your US tax obligations, repatriating profits efficiently is the next challenge. After withholding taxes are applied on FDAP income (dividends, for instance), the net amount is yours to transfer. The mechanics of that transfer — wire fees, exchange rate spreads, correspondent bank charges — can significantly erode the net amount received.

If you are holding investment assets in the US alongside your business interests, our overview of Best Brokerage Accounts for Non-Resident Aliens 2026 covers account types and the withholding rules that apply to investment income, which complements what we have covered here about business income.

When to Hire a Professional — and What Kind

For the simplest case — a single-member LLC with modest revenue, no employees, no US office, and a clear ECI determination — a US-based CPA with international tax experience can prepare your returns at a manageable cost, often in the $800–$2,500 range annually (illustrative; costs vary widely by location and complexity).

For more complex structures — multiple owners, treaty positions, state nexus in multiple states, transfer pricing questions between the US entity and a foreign parent, or potential permanent establishment exposure — you need a CPA specialising in international tax, potentially working alongside a tax attorney. The cost of professional advice is nearly always less than the penalties for non-compliance.

Look specifically for professionals who:

• Are familiar with FATCA and CRS reporting
• Have experience with Form 5472 and Section 1446 withholding
• Understand your home country's tax treatment of US income, so they can advise on the interaction between the two systems
• Can advise on Limitation on Benefits clauses if you plan to claim treaty benefits

Note: This article is practical business and financial information, not tax advice. Your specific situation may involve variables not covered here. Always engage a qualified CPA or tax attorney licensed in the relevant jurisdictions before filing.

A Practical Compliance Checklist

Use this as a starting framework, not an exhaustive list:

• [ ] Determine residency status for US tax purposes (Green Card Test / Substantial Presence Test)
• [ ] Obtain an EIN for your US business entity (Form SS-4)
• [ ] Apply for an ITIN if you will have a personal US filing obligation and have no SSN (Form W-7)
• [ ] Classify your income as ECI or FDAP — engage a CPA if uncertain
• [ ] Determine whether your home country has a US tax treaty and whether you qualify for its benefits
• [ ] File Form W-8BEN or W-8BEN-E with all US withholding agents
• [ ] File Form 5472 + pro forma 1120 if you own a foreign-owned single-member LLC
• [ ] File Form 1040-NR for personal ECI by the applicable deadline
• [ ] Assess state nexus in every state where you have customers, inventory, or employees
• [ ] Register as a foreign entity in states where you have nexus before filing
• [ ] Set calendar reminders for March 15 (partnership), April 15 (corporate/individual), and June 15 (NRA individual without US wage withholding)

Looking Further Ahead

US business tax obligations do not exist in isolation. If your business success leads you toward longer-term US residency, note that becoming a tax resident dramatically changes your obligations — you will be taxed on worldwide income, not just US-source income. The interaction between your immigration path and your tax status is one of the most consequential decisions you will make, and it requires input from both an immigration attorney and a CPA working together. This publication covers the financial and practical dimensions; for immigration status itself, always consult a licensed attorney.

Similarly, if your business generates enough profit that you are considering US real estate as an investment, be aware that non-resident property ownership carries its own tax overlay under the Foreign Investment in Real Property Tax Act (FIRPTA), which mandates withholding on real estate sale proceeds. Our guide to How Immigrants Can Buy a House in the US (2026 Guide) covers the property-buying process, though FIRPTA's tax implications are a topic for your CPA.

Filing US business taxes as a non-resident is genuinely more complex than most formation agents disclose, but it is entirely manageable with the right professional team, timely applications for identification numbers, and a clear understanding of which forms your structure requires. Start with the fundamentals covered here, then get professional eyes on your specific situation before your first filing deadline.