Current as of: April 4, 2026. This article reflects legal and regulatory authorities, administrative guidance, and market practice available as of the date above. Rules, thresholds, agency guidance, and administrative practice may change after that date, and the analysis may not apply the same way to every set of facts.
Foreign-Owned LLC Tax Compliance: Form 5472, Effectively Connected Income, and What Mexican Owners Must File Every Year
A Mexican entrepreneur forms a U.S. LLC through an online service, but no one explains Form 5472, effectively connected income, or the federal filing obligations that can apply even when the entity has little or no income. That scenario is common, and the compliance failure often becomes visible only after an IRS notice or a missed reporting deadline.
Key Points
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Form 5472 is required annually for any foreign-owned US entity with reportable transactions with related foreign parties. The requirement applies to US corporations with 25% or more foreign ownership (under IRC §6038A) and to all foreign-owned US disregarded entities, including single-member LLCs. Penalties for failure to file or for filing a substantially incomplete form start at $25,000 per form per year. If non-filing continues for more than 90 days after IRS notification, an additional $25,000 accrues for each subsequent 30-day period, with no statutory cap. For information required under IRC §6038A, the assessment period remains open until the required information is furnished to the IRS, and then generally remains open for three years as to related items.
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Whether an LLC owes US income tax depends, among other factors, on whether it has "effectively connected income" (ECI). Under IRC §864(c), income that is effectively connected with the conduct of a US trade or business is taxed at regular graduated rates. If the LLC does not have ECI, only fixed, determinable, annual, or periodic (FDAP) income from US sources is subject to US tax at a flat 30% withholding rate (subject to treaty reduction).
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The 30% withholding on FDAP income may be reduced by the US-Mexico Income Tax Convention. The treaty reduces dividend withholding to 5% for beneficial owners holding 10% or more of voting stock and 10% in other cases, provides different interest rates under Article 11 depending on the lender and instrument, and caps many royalties at 10%. Claiming treaty benefits requires the foreign owner to provide a properly completed Form W-8BEN or Form W-8BEN-E to the U.S. payer.
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Entity classification determines filing obligations. A single-member LLC owned by a foreign person is treated as a disregarded entity by default for US federal tax purposes. A multi-member LLC is treated as a partnership. Either classification may be changed by filing Form 8832 (entity classification election), which is binding for 60 months. Each classification creates different filing requirements, withholding obligations, and penalty exposures.
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Mexican tax obligations exist independently of US compliance. Mexico taxes its residents on worldwide income under the Ley del Impuesto Sobre la Renta (LISR). Income from a US LLC must be reported to the Servicio de Administración Tributaria (SAT) regardless of how the US classifies the entity or whether US tax was paid.
I. Annual Compliance Calendar
| Deadline | Filing | Who Files | Penalty for Non-Compliance |
|---|---|---|---|
| Mid-March | Form 1065 and Schedule K-1 (partnership LLCs) or extension (Form 7004) | Multi-member LLC | $255 per partner per month for tax year 2025 returns (per Rev. Proc. 2024-40; inflation-adjusted annually; up to 12 months) |
| Mid-April | Pro forma Form 1120 with Form 5472 attached (disregarded entities and C-Corp-elected LLCs) or extension (Form 7004) | Foreign-owned LLC | $25,000 per Form 5472 per year; additional $25,000 per 30 days after 90-day IRS notice (no cap) |
| Mid-April | Form 1040-NR (individual foreign owners with ECI) or extension | Foreign individual owner | Failure-to-file penalties under IRC §6651 |
| Mid-April (automatic extension to mid-October) | FBAR (FinCEN Form 114) if US person has financial interest in or signatory authority over foreign financial accounts with aggregate value exceeding $10,000 | Owner (only if treated as US person for FBAR purposes) | Up to $16,536 per non-willful violation; higher for willful violations |
| Mid-June | Automatic 2-month extension for non-resident aliens with no US wages | Foreign individual owner | - |
| Varies by state | State annual reports, franchise tax filings | LLC | Varies; failure may result in administrative dissolution |
| April (Mexico) | SAT annual declaration for worldwide income | Mexican resident owner | Mexican tax penalties under LISR |
Federal deadlines are anchored to the statutory dates (generally the 15th day of the third or fourth month following the close of the tax year). Under IRC §7503, when a statutory deadline falls on a Saturday, Sunday, or legal holiday, the deadline shifts to the next business day; the District of Columbia's Emancipation Day (April 16) can also push the federal April deadline. State deadlines vary. Confirm the exact date each year before filing.
II. Entity Classification: What Is Your LLC for Tax Purposes?
a. Single-member LLC (foreign owner)
A US LLC with a single foreign owner is treated as a disregarded entity by default for US federal tax purposes under the entity classification regulations (Treas. Reg. §301.7701-3). The entity does not file a separate income tax return. However, it retains its legal identity under state law and has independent Form 5472 filing obligations if it has reportable transactions with related foreign parties. The owner is treated as directly conducting the LLC's business activities for income tax purposes.
b. Multi-member LLC
A US LLC with two or more members is classified as a partnership by default. The LLC must file Form 1065 (US Return of Partnership Income) annually and issue Schedule K-1 to each partner. If the partnership has effectively connected taxable income allocable to foreign partners, it must withhold tax under IRC §1446 at the highest applicable rate (currently 37% for individual partners and 21% for corporate partners), regardless of whether distributions are made.
c. LLC that elected C-Corporation taxation
An LLC owner may elect to have the entity classified as a corporation for US federal tax purposes by filing Form 8832 with the IRS. The election's effective date can be no more than 75 days prior to the filing date (retroactive) or no more than 12 months after the filing date (prospective). Once a change in classification is made, the entity is generally locked into that classification for 60 months unless the IRS consents to an earlier change. However, an entity's initial classification election (made at or near formation) does not constitute a "change" and does not trigger the 60-month lock-out. A C-Corp-elected LLC files Form 1120 and is subject to the 21% corporate tax rate on its taxable income.
US-Mexico overlay. The US entity classification election does not change the LLC's classification under Mexican tax law. Mexico does not have an equivalent check-the-box regime. Mexican corporate entities are generally taxed as corporations at the applicable corporate rate under the LISR. The S. de R.L., because its members have limited liability, defaults to corporation classification for both US and Mexican tax purposes. For US tax purposes, the S. de R.L. requires an affirmative check-the-box election (Form 8832) to achieve disregarded entity or partnership status. This mismatch means the same entity can be a disregarded entity or partnership in the US and a corporation in Mexico, requiring coordination between US and Mexican tax counsel.
III. FDAP Income and the 30% Withholding
For many foreign LLC owners, withholding on passive US-source income is the first US tax obligation they encounter.
a. What is FDAP income?
Fixed, determinable, annual, or periodic (FDAP) income includes interest, dividends, rents, royalties, and certain other categories of US-source income. Under IRC §§1441 and 1442, US-source FDAP paid to a foreign person is subject to withholding at a flat 30% rate on the gross amount. No deductions are allowed against FDAP income subject to withholding.
b. Treaty reductions
The US-Mexico Income Tax Convention reduces the default 30% rate for several income categories. Article 10 limits dividend withholding to 5% for beneficial owners holding 10% or more of the paying corporation's voting stock, and 10% in other cases. Article 11 provides a three-tiered structure for interest: 4.9% for qualifying financial institutions and publicly traded bonds, 10% for bank loans and seller financing of machinery or equipment, and 15% in all other cases. Certain categories of interest, including portfolio interest may be exempt from US withholding entirely.
c. Claiming treaty benefits
Treaty benefits are not automatic. The foreign owner must provide a properly completed Form W-8BEN (for individuals) or Form W-8BEN-E (for entities) to the US withholding agent. The withholding agent reports the payment and withholding on Form 1042-S. A common practical problem: US payers often do not know how to apply treaty rates to payments made to the owner of a disregarded entity. The foreign owner may need to provide the W-8 form directly and confirm the applicable treaty rate.
IV. Form 5472: The Filing Most Foreign LLC Owners Miss
a. Who must file
Form 5472 is required for (i) any US corporation with 25% or more foreign ownership and (ii) any foreign-owned US disregarded entity (including single-member LLCs) that has reportable transactions with related foreign parties. This requirement was expanded to disregarded entities by Treasury Regulations finalized on December 13, 2016 (T.D. 9796), which treat foreign-owned disregarded entities as domestic corporations solely for the reporting requirements under IRC §6038A.
b. What counts as a reportable transaction
A reportable transaction is virtually any monetary or non-monetary exchange between the LLC and its foreign owner or related foreign parties. This includes capital contributions, loans (including informal intercompany advances), service payments, distributions, rent, royalties, and transfers of property. Paying an LLC expense from a personal foreign bank account also constitutes a reportable transaction.
Three scenarios that illustrate the filing trigger:
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An owner contributes $50,000 to an LLC but the LLC has no revenue. The capital contribution is a reportable transaction, triggering a Form 5472 filing requirement.
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An owner pays the LLC's web hosting bill from a personal Mexican bank account. That payment is a reportable transaction between the owner and the entity, requiring Form 5472 filing.
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An LLC has zero business activity for the year. If there were any related-party transactions (even an intercompany balance carried forward) a filing obligation may exist.
c. Filing mechanics
A foreign-owned disregarded entity files Form 5472 by attaching it to a pro forma Form 1120. This pro forma return does not create corporate tax liability; it serves only as a cover sheet.
d. Penalties
A penalty of $25,000 per form per year is assessed for failure to file, late filing, or filing a substantially incomplete form. If the failure continues for more than 90 days after IRS notification, an additional $25,000 accrues for each subsequent 30-day period, with no cap. For information required under IRC §6038A, the assessment period remains open until the required information is furnished to the IRS, and then generally remains open for three years as to related items. Each member of a consolidated group is subject to a separate penalty and each member is jointly and severally liable.
V. Effectively Connected Income: When Your LLC Owes US Income Tax
a. The threshold question
The determinative question is whether the LLC is "engaged in a trade or business within the United States" (ETOB) under IRC §864(b). If yes, income that is effectively connected to that business (ECI) is taxed at regular graduated rates (up to 37% for individuals and 21% for C-Corporations).
b. What constitutes ETOB
The standard is "considerable, continuous, and regular" business activity in the US. This is a facts-and-circumstances determination under case law, not a bright-line statutory test. Common scenarios for Mexican LLC owners:
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US rental property: Generally ECI, particularly if the owner elects under IRC §871(d) to treat net rental income as effectively connected. This election allows the owner to claim deductions against rental income (depreciation, mortgage interest, repairs) rather than paying the flat 30% FDAP withholding on gross rents.
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US operating business (service company, retail, manufacturing): Clearly ECI. The LLC is conducting a trade or business in the US.
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E-commerce with US fulfillment (e.g., Amazon FBA): Potentially ECI. The use of US-based fulfillment infrastructure may create ETOB, though the analysis is fact-specific and evolving.
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Online services performed entirely from Mexico for US clients: Generally not ECI if the individual performs all services outside the US and has no dependent agent in the US. However, the US-Mexico treaty's permanent establishment provisions (Article 5) must also be analyzed.
c. Filing when ECI exists
If the LLC has ECI, the foreign individual owner must file Form 1040-NR (US Nonresident Alien Income Tax Return), report the ECI, claim allowable deductions, and pay tax at graduated rates. If the LLC is a multi-member partnership with ECI allocable to foreign partners, the partnership withholds under IRC §1446 at the highest applicable rate (37% for individuals, 21% for corporate partners).
VI. Branch Profits Tax
If a foreign corporation owns a U.S. disregarded entity that is engaged in a U.S. trade or business, the foreign corporation may be subject to branch profits tax under IRC §884 on the dividend equivalent amount. A U.S. LLC that has elected corporate status is generally taxed as a domestic corporation instead, so the branch-profits analysis is different. This tax is imposed on the "dividend equivalent amount," which approximates the earnings deemed repatriated to the foreign owner. The US-Mexico treaty addresses the branch profits tax in Article 11A ("Branch Tax"), which limits the BPT on a qualified resident of Mexico to 5% (the Article 10(2)(a) direct-dividend rate), provided the foreign corporation satisfies the treaty's limitation-on-benefits article and qualifies as a "qualified resident" under IRC §884(e) and Treas. Reg. §1.884-1(g).
Important distinction for disregarded entities: If a foreign individual owns a US disregarded entity, branch profits tax generally does not apply because there is no "corporation" for §884 purposes. However, if a foreign corporation owns a US disregarded entity, the DE is usually treated as a US branch of that foreign corporation. The foreign corporate owner is deemed to be engaged in a US trade or business through the DE, and the branch profits tax applies to the dividend equivalent amount attributable to the DE's earnings. Entity classification and ownership structure therefore have direct branch profits tax implications.
VII. State-Level Obligations
| State | Annual Filing | Tax Obligation | Notes |
|---|---|---|---|
| Delaware | Annual franchise tax | No state income tax if no DE-source income | Most popular formation state |
| Texas | Franchise tax / public information filing | Margin tax applies only above the current no-tax-due threshold (for 2026 reports, $2.65 million of annualized total revenue) | No state income tax |
| Wyoming | Annual Report | No state income tax | Increasingly popular for LLCs |
| California | Statement of Information + minimum annual franchise tax | State income tax on CA-source income | Minimum tax applies even to inactive LLCs |
| Florida | Annual Report | No state income tax | Common for real estate LLCs |
State filing obligations exist independently of federal requirements. Failure to file state annual reports can result in administrative dissolution of the LLC, loss of good standing, and potential personal liability for the owner.
VIII. Coordinating US and Mexican Tax Obligations
a. Mexican worldwide income taxation
Mexico taxes its residents on worldwide income under the LISR. Income from a US LLC (whether classified as a disregarded entity, partnership, or corporation for US purposes) must be reported to SAT in the owner's annual declaration, regardless of whether US tax was paid.
b. Foreign tax credit
Mexican residents may generally credit US taxes paid against their Mexican income tax liability on the same income, subject to the LISR's foreign tax credit provisions and the treaty's double-taxation relief mechanism (Article 24). Mexican residents may claim a foreign tax credit under the LISR for US taxes paid on the same income, subject to applicable limitations. The credit is limited to the Mexican tax attributable to the US-source income. However, if the US LLC is a disregarded entity with no ECI and no US tax is owed, there is no US tax to credit and the Mexican tax becomes the full burden on that income.
c. Transfer pricing
If the LLC transacts with a Mexican parent or related entity, arm's-length pricing and contemporaneous documentation are required by both the IRS and SAT. Failure to maintain transfer pricing documentation can result in penalties and adjustments in both jurisdictions.
d. REFIPRES
If a Mexican resident holds effective control of a US entity and the entity's effective tax rate is below 75% of Mexico's 30% corporate rate (i.e., below 22.5%), Mexico's REFIPRES regime (Régimen Fiscal Preferente, LISR Title VI, Chapter I) may treat the entity's undistributed profits as deemed income to the Mexican shareholder, regardless of whether any distribution occurs. Because the US federal corporate rate (21%) falls below this threshold, a US C-Corp controlled by a Mexican resident may trigger REFIPRES.
e. FBAR/FATCA considerations
FBAR (FinCEN Form 114) requires US persons (including US citizens, green card holders, and individuals meeting the substantial presence test) to report foreign financial accounts with aggregate value exceeding $10,000. A Mexican national who is not a US person for FBAR purposes generally has no FBAR obligation, even if they hold US bank accounts. However, if the Mexican owner qualifies as a US person under the substantial presence test, FBAR and FATCA obligations may arise for any foreign (non-US) accounts they hold.
IX. Common Questions
Q: My LLC had no income. Do I still need to file Form 5472? A: If there were any reportable transactions between the LLC and related foreign parties during the year (including capital contributions, loans, or payments), yes. The filing obligation is triggered by reportable transactions, not by income.
Q: I filed through tax software. Am I covered? A: Consumer tax software may not support Form 5472 or the pro forma Form 1120 required for foreign-owned disregarded entities. These filings typically require professional preparation and cannot be e-filed; they must be submitted by mail or fax to the IRS.
Q: My formation service handles my compliance. A: Formation services handle state annual reports and registered agent services. Check if they handle Form 5472, Form 1040-NR, or the related federal international reporting obligations unless that work is expressly included. Federal compliance is a separate obligation.
Q: I don't need a Mexican filing because my LLC is in the US. A: Mexico taxes its residents on worldwide income, so U.S. LLC income often still needs to be analyzed and reported under Mexican law.
Q: I claimed the treaty rate, so I don't owe anything. A: Claiming treaty benefits requires proper documentation: a completed Form W-8BEN or W-8BEN-E filed with the correct US withholding agent. Self-assessment alone is not sufficient. The withholding agent must apply the reduced rate and report it on Form 1042-S.
This Insight is provided by HIRO LAW for general informational and educational purposes only. It does not constitute legal, tax, investment, or other professional advice and should not be relied upon as such. No attorney-client relationship is created by your receipt of or access to this material. The information contained herein may not reflect the most current legal developments and is not guaranteed to be complete, correct, or up to date. You should not act or refrain from acting based on any information in this Insight without first seeking qualified counsel licensed in the relevant jurisdiction(s). Each cross-border transaction, investment, and compliance matter involves unique facts and circumstances that require individualized analysis. Prior results do not guarantee a similar outcome.