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.
Search Funds and Entrepreneurship Through Acquisition: A Cross-Border Guide for Mexican Investors
The search fund model is increasingly relevant to Mexican investors evaluating U.S. lower-middle-market acquisitions. But for a Mexican national or family office using the model cross-border, the legal analysis changes materially at the levels of financing, entity selection, withholding, seller-note enforcement, and exit planning. This Insight focuses on the legal and tax issues that most often differentiate a cross-border acquisition from a domestic U.S. search-fund transaction.
Key Points
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SBA eligibility should be confirmed against current policy before it is assumed in the financing plan. As of April 4, 2026, SBA policy materially limits eligibility where ownership includes non-qualifying foreign owners, so Mexican-led acquisitions should generally be modeled with alternative financing paths from the outset.
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Entity selection for the acquisition vehicle differs when the buyer is a non-resident alien. The C-Corp versus LLC analysis shifts because of REFIPRES exposure (Mexico's anti-deferral regime), treaty withholding rates on distributions, pass-through withholding obligations under IRC §1446, and QSBS eligibility requirements. The US entity classification election (Form 8832) usually does not change Mexican tax treatment.
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QSBS (Section 1202) may be available to non-resident alien shareholders, but the Mexican tax treatment can offset the US benefit. IRC §1202 requires that the stock be issued by a domestic C corporation but does not require the shareholder to be a US person. However, because the exclusion mitigates US federal income tax, there may be no US tax to credit against the Mexican income tax liability on the same gain. The net benefit requires fact-specific modeling.
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Seller financing creates cross-border enforcement risk. A US promissory note secured by a UCC Article 9 security interest is not automatically enforceable in Mexico. A Mexican garantía mobiliaria registered with the RUG does not automatically perfect a lien in the US. Dual-jurisdiction collateral perfection requires simultaneous filings.
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The US-Mexico tax treaty affects every layer of the transaction. Article 10 reduces dividend withholding to 5% for shareholders holding 10% or more of voting stock and 10% for portfolio shareholders. Article 11 addresses interest withholding on seller notes. Article 13 allocates taxing rights on capital gains. Article 24 provides double-taxation relief through the foreign tax credit mechanism. The treaty's application must be coordinated with both US and Mexican domestic law.
I. The Search Fund Model: A Brief Overview
A search fund is an investment vehicle in which one or two individuals (the "searchers") raise a small pool of capital from aligned investors, typically $400,000 to $800,000, to fund a full-time search for a privately held company to acquire. Upon identifying a target, the searcher raises acquisition capital from the same or expanded investor group, acquires the business, and operates it as CEO. Under market convention reflected in the 2024 Stanford Search Fund Study, the searcher typically receives approximately 25% of common equity, divided into three tranches (vesting at closing, over time during operation, and based on performance against investor return hurdles). Target companies are typically profitable lower-middle-market businesses with recurring revenue and often a succession dynamic; industry primers commonly describe the sweet spot as roughly $1–$5 million in EBITDA, though the band is a convention rather than a rule.
According to IESE's 2024 data, 71% of international searchers hold an MBA, and over two-thirds raised their fund within two years of graduation. The model has gained particular traction among graduates of IPADE, EGADE, Stanford, Wharton, and Kellogg with ties to the US-Mexico corridor.
II. Financing: The SBA Problem and Alternative Paths
a. The 2026 SBA policy change
The SBA's 7(a) loan program has historically been a major source of acquisition financing for self-funded search acquisitions. On February 2, 2026, the SBA issued Policy Notice which requires that 100% of all direct and indirect owners of an SBA borrower be US citizens or US nationals with principal residence in the United States, its territories, or possessions. The prior exception allowing a minority of foreign ownership has been rescinded. Notably, even lawful permanent residents (green card holders) are now excluded from holding any ownership interest in an SBA-financed business. This change applies to the 7(a) and 504 loan programs and has since been extended to the Surety Bond and Microloan programs. Businesses with any direct or indirect ownership that does not satisfy the SBA's current citizenship and principal-residence requirement are ineligible; Mexican-owned acquisitions will often fail that test.
b. Alternative financing for the Mexican searcher
Where SBA financing is unavailable under the current ownership structure, Mexican searchers may need to rely more heavily on seller financing, investor capital, bank debt, or private credit. Seller financing (in which the seller carries back a promissory note for a portion of the purchase price) is the most common alternative. In lower middle market transactions, Seller-note sizing is transaction-specific and depends on lender availability, seller risk tolerance, collateral, and deal economics. The cross-border enforcement mechanics of seller notes are addressed in Section VI below and in other insights published by Hiro Law.
Other financing paths include traditional search fund investors (who invest in both the search and acquisition phases), conventional bank debt (which carries higher interest rates and stricter covenants for foreign borrowers), and private credit or mezzanine lenders. Earlier IESE data (2016 study, ST-0415-E) showed that in Mexico and Brazil, searchers reported using a relatively modest amount of debt (approximately 20% of enterprise value, compared with approximately 50% in the US), reflecting the less-established leveraged buyout model in Latin American markets. More recent data may differ as the model matures.
III. Entity Selection for the Mexican Acquirer
a. C-Corporation vs. LLC
A Mexican national acquiring a US business through a search fund structure typically evaluates forming a US C-Corp or a US LLC as the acquisition vehicle. Each classification carries distinct cross-border tax consequences.
A C-Corporation may be preferred when the searcher plans to retain earnings in the US, seeks QSBS eligibility under IRC §1202, or wants a cleaner capital structure for multiple investors. However, C-Corp taxation creates double taxation in the US (corporate-level tax at 21% plus shareholder-level dividend tax on distributions). The US-Mexico treaty reduces dividend withholding to 5% for shareholders holding 10% or more of the corporation's voting stock, and 10% for portfolio shareholders below that threshold.
An LLC taxed as a partnership (the default for multi-member LLCs) avoids entity-level US tax; profits flow through to members' individual returns. However, a partnership with effectively connected taxable income allocable to foreign partners must withhold tax under IRC §1446 at the highest applicable rate (37% for individuals, 21% for corporate partners), and each foreign partner must file a US return. Pass-through treatment is not administratively light for non-resident owners.
US-Mexico overlay. Mexico's REFIPRES regime (Régimen Fiscal Preferente) may treat undistributed profits of a US C-Corp as deemed income to a Mexican resident shareholder if (i) the Mexican resident has effective control over the US corporation (directly, indirectly, or together with related parties) and (ii) the US corporate tax rate (21%) falls below Mexico's 22.5% REFIPRES threshold. Because the US federal rate currently falls below this threshold, a controlling Mexican shareholder in a US C-Corp could face current Mexican taxation on the corporation's undistributed profits, regardless of whether any distribution occurs. However, LISR Article 176 contains an active-business exception that can take the income out of the REFIPRES regime where the foreign entity's income is derived from genuine active business activities (and is not predominantly passive), which will often be the case for a search-fund operating company; whether the exception is available is fact-specific and should be analyzed before relying on it. Additionally, the US entity classification election (Form 8832) may not change the entity's classification under Mexican tax law. Mexico does not have an equivalent check-the-box regime.
b. Holding company considerations
Some Mexican searchers interpose a Mexican holding company (HoldCo) between themselves and the US acquisition vehicle. This structure may facilitate Mexican investor participation, streamline distributions, and create treaty benefits at multiple tiers. However, it introduces transfer pricing obligations between the HoldCo and US OpCo (arm's-length pricing and contemporaneous documentation required by both the IRS and SAT) and may affect QSBS eligibility depending on how stock is held.
c. Search fund investor structure
In a traditional search fund, 10-20 investors fund the search phase and invest pro rata in the acquisition. For a Mexican-led cross-border search, the investor base may include a mix of US and Mexican capital. US investors must consider QSBS eligibility for their investment and withholding on distributions from a foreign-owned entity. Mexican investors face REFIPRES exposure, treaty benefit considerations, and SAT reporting obligations on foreign investment income.
IV. QSBS Planning: The Mexican Tax Consideration
Section 1202 may be relevant to some cross-border search-fund structures, but the practical benefit depends on issuance date, holding period, shareholder status, issuer qualification, and the investor's Mexican tax position. Because the U.S. benefit may reduce or eliminate the amount of U.S. tax available for credit in Mexico, the net result should be modeled before QSBS is treated as a core exit assumption.
OBBB Act Changes (July 4, 2025). Public materials clearly reflect that for stock issued after July 4, 2025, the One Big Beautiful Bill Act introduced a tiered QSBS exclusion: 50% of gain after at least three years, 75% after at least four years, and 100% after at least five years. Public materials also clearly reflect that the gross-assets threshold increased from $50 million to $75 million (inflation-indexed after 2026). Public summaries and current codified text are not fully aligned, however, on all post-July 2025 gain-cap mechanics, so the applicable per-issuer gain limit for post-July 4, 2025 stock should be confirmed against current law and guidance before it is modeled in a transaction. Stock issued on or before July 4, 2025 continues to require a five-year holding period and continues to operate under the pre-amendment framework.
For a detailed analysis of QSBS technical requirements and cross-border traps, see Insights on QSBS tax planning.
V. The Treaty Layer
The US-Mexico Income Tax Convention affects every stage of a cross-border search fund acquisition:
Article 7 (Business Profits). Profits of an enterprise are taxable only in the country of residence unless the enterprise carries on business through a permanent establishment in the other country.
Article 10 (Dividends). Dividends paid by a US corporation to a Mexican resident shareholder are subject to US withholding at 5% if the beneficial owner holds at least 10% of the voting stock, and 10% in other cases. Treaty benefits require proper documentation (Form W-8BEN for individuals or Form W-8BEN-E for entities).
Article 11 (Interest). Interest arising in one country and paid to a resident of the other is subject to a three-tiered withholding structure: 4.9% for interest paid to qualifying financial institutions and on publicly traded bonds, 10% for interest on bank loans and seller financing of machinery or equipment, and 15% in all other cases. Certain categories of interest (including portfolio interest under IRC §871(h)) may be exempt from US withholding entirely under domestic law, regardless of the treaty rate. The applicable rate depends on the nature of the debt instrument, the identity of the lender, and proper documentation. This directly affects the net yield on seller-financed notes.
Article 13 (Capital Gains). Both countries may tax gains from the alienation of real property. Gains from the sale of shares deriving more than 50% of their value from real property situated in one country may also be taxed by that country.
Article 24 (Relief from Double Taxation). Mexico generally provides a credit for US taxes paid on income also subject to Mexican tax. However, if the US tax is eliminated (e.g., through QSBS exclusion), the credit mechanism may provide no relief.
VI. Seller Financing: The Cross-Border Enforcement Gap
With SBA loans unavailable, seller financing becomes a larger component of the capital stack for Mexican acquirers. The enforcement problem arises when the buyer defaults and collateral spans both jurisdictions.
A US promissory note secured by a UCC Article 9 security interest is perfected by filing a UCC-1 financing statement in the state of the debtor's location. This filing does not create an enforceable lien on assets located in Mexico. Conversely, a Mexican garantía mobiliaria registered with the Registro Único de Garantías Mobiliarias (RUG) does not automatically perfect a security interest in US assets. A cross-border seller note must be structured with simultaneous UCC and RUG filings, carefully drafted choice-of-law provisions, and cross-border personal guarantees if the buyer's personal assets are in Mexico.
A US monetary judgment against a Mexican buyer generally requires a separate recognition and enforcement proceeding before the competent Mexican court under Mexican law, adding time and cost that may exceed the debt itself. For a detailed treatment of seller-note structuring, see the Insight on Seller Financing in Cross-Border M&A).
VII. Due Diligence Additions for the Cross-Border Searcher
Standard search fund due diligence (financial, legal, operational, customer concentration) applies. A Mexican acquirer should additionally evaluate: CFIUS screening requirements (whether the target industry triggers a mandatory or voluntary filing); state-level foreign ownership restrictions; I-9 compliance and successor employer liability; change-of-control provisions in key customer and vendor contracts; and beneficial ownership reporting obligations under FinCEN rules.
For a detailed analysis of asset vs. stock deal structuring, see Insight on Structuring the Deal.
VIII. Common Questions
Can a Mexican national obtain an SBA loan for a U.S. acquisition? Only if the ownership structure satisfies the SBA's current citizenship and principal-residence requirements as of the time financing is sought. Because that policy can change, eligibility should be confirmed directly against current SBA guidance before it is built into the deal model.
Does QSBS work for foreign investors? IRC §1202 does not, by its terms, limit the exclusion to US persons. However, the practical benefit may be offset by Mexican income tax on the same gain, since the elimination of US tax reduces or eliminates the foreign tax credit available under Mexican law.
What happens if my seller note defaults and the collateral is in Mexico? A US judgment does not automatically enforce in Mexico. A separate recognition proceeding (exequatur) is required, which adds time and cost. Proper dual-jurisdiction structuring at the outset is the most effective mitigation.
Next Steps
Entity selection, financing structure, and treaty positions are interdependent and benefit from early analysis before signing a letter of intent, rather than after. Mexican founders and family offices evaluating US acquisitions through the search fund model may benefit from consulting with both US and Mexican counsel at the structuring stage.
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.