Seller Financing in Cross-Border M&A

March 11, 2026

Current as of: September 6, 2026. 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.

By Rene Hinojosa, Principal, Hiro Law. Licensed in Texas, California, and Mexico.

In cross-border M&A between Mexico and the U.S., seller financing can create significant enforcement and recovery risk if the note, collateral package, guarantees, and priority arrangements are not structured carefully. The difference between a well-documented note and a loosely documented note can materially affect leverage, recovery options, and timing.

Key Points

Promissory note fundamentals (principal, interest rate, maturity, amortization schedule, and acceleration clauses) affect enforcement rights and recovery prospects when the buyer fails to pay.
Security interests on US assets commonly require filing, but some collateral requires control, possession, or another statutory method; collateral type and governing perfection law determine the method and office. For Mexican collateral, identify the security device and its required formalities, including Registro Único de Garantías Mobiliarias (RUG) registration where applicable; real-property mortgages require the applicable local formalities and registration.
Personal or entity guarantees in cross-border deals create additional collection paths but introduce complexity around which entity actually guarantees and under what governing law.
Intercreditor and subordination agreements address recovery priority. A bank may condition financing on seller subordination, which the seller can negotiate or reject.
Cross-border enforcement of a U.S. monetary judgment in Mexico generally requires a separate recognition and enforcement proceeding before the competent Mexican court, adding cost and delay that can materially affect net recovery.
Determine whether domestic law imposes interest withholding and whether an exemption or treaty limitation applies. Payment direction, tax status, beneficial ownership and documentation affect the result and the seller’s net recovery.
Absence of documented security arrangements leaves sellers with an unsecured claim against the buyer's assets, with recovery subject to applicable claim priorities and collection or insolvency procedures.

I. The Promissory Note: Non-Negotiable Core Elements

A. Principal, Term, and Amortization

The promissory note names the principal amount, maturity date, and amortization schedule. Avoid vague "as agreed" language. State whether the note amortizes equally over the term or balloons at maturity. State whether prepayment is permitted and whether prepayment carries a penalty.

The maturity date controls when the buyer's obligation becomes due. A three-to-seven-year term is one possible negotiated example, not a market rule; model amortization against the buyer's projected cash flow from the acquisition. An unduly short maturity can exceed the buyer’s projected cash-generation capacity. Set amortization too slow and your security interests may not be sufficient to cover full recovery if the buyer defaults in year three.

B. Interest Rate and Accrual

State the interest rate in basis points or as a fixed percentage. Specify whether interest accrues daily, monthly, or annually. Specify whether unpaid interest compounds or accrues separately.

The interest rate should be negotiated in light of commercial benchmarks, the buyer's credit risk, and the transaction's tax consequences, including any applicable withholding or imputed-interest rules. A 5% note payable by a U.S. obligor to a Mexican resident seller may yield less on a net basis after any applicable U.S. withholding, home-country taxation, and treaty/documentation effects. Price the note to account for this friction.

Check the applicable usury regime before fixing ordinary interest, default interest and charges treated as interest. Texas Finance Code §302.001 imposes a general limit unless another law authorizes a different rate; determine the applicable commercial-loan provisions and exceptions rather than treating a negotiated rate or a headline statutory percentage as universally permissible.

C. Acceleration and Default

The note should clearly specify the events that may trigger acceleration.

Acceleration clauses are not ceremonial. When validly exercised under the note and applicable law, they can make the outstanding balance due before scheduled maturity. Weak acceleration language (e.g., "upon material default") creates litigation risk about whether default actually occurred. Use objective triggers where possible.

II. Security Interests in US Assets: UCC Article 9 Mechanics

A. Creation and Perfection

UCC Article 9 governs the creation, perfection, and priority of security interests in personal property, fixtures, and accounts. Under the ordinary Article 9 rule, attachment requires value, debtor rights in the collateral or power to transfer rights, and an authenticated security agreement describing the collateral or an applicable possession, delivery or control alternative. The parties may expressly postpone attachment. See Texas §9.203.

Attachment alone does not necessarily perfect a security interest. Perfection commonly requires filing, but some collateral requires control, possession, or another statutory method. For example, deposit accounts as original collateral generally require control. Determine collateral type and the governing perfection law before choosing a filing office. Under the general filing rule, a U.S. registered organization is located in its state of organization: a Delaware corporation ordinarily calls for a Delaware filing, and a Wyoming LLC for Wyoming, regardless of its manager's residence. Exceptions apply, including collateral governed by location, control, certificate-of-title, or other special rules. Texas Article 9 §§9.301–9.307 and 9.310–9.314 provide the Texas framework. An incorrect method or jurisdiction can impair perfection and priority.

B. Collateral and Priorities

As a seller, you want security in the acquired business's assets. Common collateral includes accounts receivable, inventory, equipment, and intellectual property of the target. An all-assets indication may suffice in a financing statement, but the security agreement must reasonably identify the collateral and satisfy applicable special-description requirements; the two documents serve different purposes. See Texas §§9.108(c) and 9.504. A buyer that owns target shares does not thereby own target assets: target collateral requires a valid grant by the target and separate authority, benefit, and avoidance analysis.

The filing creates a public record. As a general matter, priority among competing Article 9 security interests in the same collateral often follows the first-to-file-or-perfect rule, subject to important exceptions such as control-based collateral, PMSIs, possessory interests, and subordination arrangements. If the bank has a purchase-money security interest in inventory or equipment (granted as part of the acquisition financing), the bank may have priority in those assets despite your filing date. Intercreditor agreements (discussed below) resolve these conflicts.

III. Security Interests in Mexican Assets: Prenda and Registro Publico

A. Pledge (Prenda) and Registration

Mexican law provides several security mechanisms for movable assets, including in particular the prenda sin transmisión de posesión and, in some transactions, a fideicomiso de garantía; the appropriate structure depends on the asset class and transaction. A Mexican movable-asset security interest must comply with the applicable statutory formalities for the chosen security device, and registration in the Registro Único de Garantías Mobiliarias (RUG) is generally key to opposability against third parties; whether notarization or ratification before a notary is required depends on the instrument and collateral.

A prenda sin transmisión de posesión does not require the creditor to take physical possession of the collateral. This is practical for operating businesses where the debtor must retain possession to conduct operations. The agreement should clearly identify the secured obligations, collateral and applicable maturity or payment mechanics, including how any future obligations are determined. Verify the mandatory formalities for the chosen instrument separately. For registrable Mexican movable security interests, priority is often materially affected by the order and effectiveness of registration in the RUG, but priority must be analyzed under the specific security instrument, collateral type, and applicable Mexican law.

B. Perfection Through the RUG

For registrable Mexican movable security interests, registration in the RUG is generally required to make the security interest opposable against third parties. The RUG generally follows a time-based priority logic for registrable interests, but the Mexican regime is not identical to Article 9 and priority must be analyzed under the specific security instrument and applicable Mexican law.

RUG is an electronic federal registry for certain movable security interests. Registration mechanics, timing, and ancillary formalities depend on the transaction documents and filer access; parties should not assume state-based timelines or percentage-of-debt registry costs. Registration does not resolve every priority or insolvency issue; effectiveness remains subject to the instrument, applicable law, competing rights, and avoidance rules.

For real property in Mexico, a mortgage (hipoteca) must be executed in the required form before a Mexican notary and registered in the applicable Registro Público de la Propiedad in the state where the property is located to be effective against third parties.

C. Cross-Border Complications

A single buyer entity may have assets in both the U.S. and Mexico. Protection across both jurisdictions requires the appropriate U.S. filings and the appropriate Mexican security documents and registrations for the relevant asset class, such as RUG registration for qualifying movable collateral or Registro Público de la Propiedad registration for real-property mortgages. Failure to complete the applicable perfection or registration steps can impair protection in that jurisdiction.

Enforcement is jurisdiction-specific. A UCC-secured party in the US can foreclose through repossession and sale (with notice). Enforcement of Mexican security interests depends on the type of collateral and the security instrument; under Mexican law, enforcement of security interests typically requires judicial processes governed by the applicable commercial or civil procedure codes, unless the security instrument includes provisions for alternative enforcement mechanisms. These are separate proceedings with separate costs and timelines.

IV. Subordination, Intercreditor Agreements, and Bank Debt

A. The Subordination Problem

When the buyer finances the acquisition with a bank loan, the bank typically insists on a first-priority security interest in the business assets. A conflict arises where both lenders demand exclusive senior priority in the same collateral. Shared ranking or other allocations may be negotiated, and first priority alone does not assure sufficient proceeds for recovery.

An intercreditor agreement is one mechanism used to allocate lien priority and enforcement rights among creditors. In many transactions, the seller agrees by contract to subordinate whatever priority it might otherwise have to the bank lender. In return, the agreement may provide the seller with notice rights, limited consultation rights, cure rights, or negotiated carve-outs from the collateral package or waterfall. In many senior/subordinated structures, the senior lender is paid first from shared collateral unless the parties expressly negotiate a different arrangement.

Intercreditor negotiations can be difficult when a bank conditions its financing on seller subordination. The seller must decide whether to negotiate or accept that economic concession, or pursue a different financing structure. If net shared-collateral proceeds are $2M and senior secured debt is $3M, a senior-first waterfall gives the senior lender the $2M, leaves it $1M short, and gives the subordinated seller nothing from that collateral. This example excludes other collateral and recoveries and assumes costs have already been deducted. This is a material economic concession.

The seller should negotiate for: (1) carve-outs where the seller's lien is not subordinated (e.g., real property or specific asset classes), (2) limited standstill periods, notice rights, cure rights, or release constraints, or (3) payment and collateral baskets or other specifically negotiated exceptions to the senior-first waterfall.

B. Cross-Border Intercreditor Mechanics

In cross-border deals, intercreditor agreements must contemplate both US UCC liens and Mexican pledges. The agreement should specify that subordination applies to each jurisdiction's perfection mechanisms. Omitting Mexican collateral may leave local priority or enforcement rights unaddressed; determine the actual ranking under the Mexican security package and applicable law. Silence does not confer first priority.

Although Article 9 grants PMSIs special priority rules if statutory requirements are met, a secured party may contractually subordinate that priority in an intercreditor or subordination agreement. PMSI treatment differs between asset classes: (1) in equipment, a PMSI holder generally has 20 days from the debtor receiving possession to perfect and gains priority over earlier-perfected security interests; (2) in inventory, priority requires perfection when the debtor receives possession and advance receipt of the prescribed notice by the statutory class of conflicting inventory secured parties; it can extend to specified proceeds. Confirm the governing state's enactment, including Texas §9.324. These distinctions are material in cross-border deals because the type of collateral determines whether super-priority is available.

V. Personal Guarantees and Entity Structures

A. Seller Note Guarantees

Identify the maker of the promissory note and the assets available to support its obligation; in a buyer-entity structure, the maker may be the acquiring corporation or LLC. If the buyer has insufficient assets, recovery may be impaired. Insolvency or dissolution does not itself erase secured status, which depends on collateral value, attachment, perfection, priority, avoidance rules, and insolvency law. 11 U.S.C. §506(a) addresses secured status by collateral value in bankruptcy. A negotiated personal or entity guarantee may provide another recovery source.

A personal guarantee obligates the buyer's owner(s) to pay the note if the entity fails. The parties may negotiate joint and several liability (each guarantor is liable for 100% of the obligation, not just their pro-rata share). Without joint and several liability, collection from one guarantor may not satisfy the full obligation.

B. Cross-Border Guarantee Complexity

A guarantee issued by a Mexican or U.S. guarantor should expressly state its governing law and forum. In cross-border practice, enforceability may still be affected by applicable conflict-of-laws principles, mandatory local law, and the forum in which enforcement is sought. If you have multiple guarantors in different countries, you may face multiple enforcement paths under different legal systems.

Identify whether the Mexican instrument is a fianza, aval, or another undertaking. Under the federal civil-law fianza framework, orden concerns prior pursuit of the principal debtor, and excusión concerns resort to that debtor's available property. Waivers and statutory exceptions must be assessed under the applicable law; the federal framework should not be assumed to govern every local-law instrument. See Federal Civil Code arts. 2814–2817 and 2822–2823.

Choose governing law and forum by reference to the guarantor, assets, available defenses, and recognition and enforcement requirements. A U.S. forum clause does not remove mandatory Mexican law or the need for local enforcement analysis.

VI. Default Remedies: Acceleration, Foreclosure, and Cross-Border Recovery

A. US Remedies: UCC Article 9 Foreclosure

A UCC-1 filing is not an independent right to repossess. Following default, a secured party's rights depend on an enforceable security agreement, applicable Article 9 remedies, priority arrangements, and other law. Bankruptcy's automatic stay can restrict repossession, foreclosure, and collection proceedings; assess 11 U.S.C. §362 and any required relief before acting. Where permitted, Article 9 allows taking possession without judicial process only if it can be done without breach of the peace.

For equipment or inventory, the seller may hire a recovery agent to take possession. The collateral is then sold at public or private sale, with the proceeds applied first to the sale costs and then to the secured debt. Any surplus goes to junior lienholders or the debtor. Any deficiency remains owed by the debtor.

Foreclosure rights are subject to the requirement of "commercially reasonable" sale procedures. A sale conducted without required notice, to a related party at below-market price, or with inadequate marketing may be challenged as not commercially reasonable, which can expose the secured party to damages or defenses and may limit or bar its ability to recover a deficiency from the debtor.

B. Mexican Remedies: Judicial Foreclosure

Self-help repossession under Mexican law is far more limited than under U.S. law. Under Mexican law, enforcement of security interests typically requires judicial processes governed by the applicable commercial or civil procedure codes, unless the security instrument includes provisions for alternative enforcement mechanisms. The process typically involves commencing the applicable judicial enforcement proceeding, obtaining the necessary court orders, and carrying out seizure and sale through the court and its authorized enforcement officers, depending on the instrument and procedure.

The time to obtain seizure and sale varies significantly depending on the forum, collateral, procedure, service, debtor defenses, and appeals. Delay may reduce net recovery if collateral depreciates or business value is dissipated.

C. Cross-Border Judgment Enforcement

A monetary claim may provide another enforcement route, but collection litigation and judgment enforcement may themselves be stayed in insolvency. Assess the stay and the applicable claims process before commencing or continuing proceedings. A judgment in a U.S. court for the seller note amount requires a separate recognition-and-enforcement analysis before execution in Mexico.

A U.S. judgment is not automatically enforceable in Mexico. The creditor generally must seek recognition and enforcement before the competent Mexican court under applicable procedural rules, and enforcement is subject to statutory requirements such as jurisdiction, service, finality, and public-policy review. Recognition and enforcement can add substantial time and cost, and the duration and expense vary significantly depending on the forum, service issues, debtor defenses, and whether the proceeding is contested.

In smaller disputes, the cost and delay of a recognition-and-enforcement proceeding in Mexico may consume a meaningful portion of the potential recovery, which is one reason upfront collateral and guaranty structure usually matter more than post-default litigation theory.

VII. The Cost of No Documentation: An Unsecured Claim

An unsecured creditor without collateral or a guarantee has a claim only against the debtor's general assets. In insolvency, recovery depends on claim priority, asset value, procedure, and jurisdiction-specific rules, and unsecured recovery may be materially impaired by delay, legal cost, and higher-priority claims. A secured note with properly documented collateral, perfection, guarantees, and priority arrangements usually provides materially better leverage and recovery prospects than an unsecured note, but outcome depends on the debtor's assets, competing liens, procedure, and jurisdiction.

VIII. Withholding Tax and Treaty Overlay

US-Mexico overlay. Article 11 of the U.S.-Mexico income tax treaty provides differentiated withholding outcomes for interest, including reduced rates or exemptions in certain cases, depending on the nature of the recipient and the payment; the applicable rate must be determined from the treaty and domestic law, not assumed to be a flat percentage. Interest paid by a U.S. obligor to a Mexican resident may be subject to U.S. withholding unless an applicable statutory exemption or treaty reduction applies and the required documentation is in place.

Seller-note interest is generally taxable, but the taxable amount and recognition year depend on the seller’s tax status and applicable receipt, accrual and inflation-adjustment rules. If withholding applies under the relevant domestic law and any applicable treaty, the payer must withhold the applicable amount at the time of payment, subject to available exemptions or reductions and the required documentation. The applicable withholding rate depends on the treaty, beneficial ownership, limitation-on-benefits, portfolio interest rules, and documentation (e.g., Form W-8BEN/W-8BEN-E).

The seller may be entitled to a foreign tax credit in their home country for withheld taxes, but the credit process is separate from the withholding itself. The seller’s net cash flow should account for any applicable withholding, residence-country tax and available credits.

For a Mexican tax resident, determine the applicable LISR rules for the taxpayer and instrument, including any real-interest and recognition rules, rather than treating every receipt as the same ordinary-income tax base. Model Mexican tax separately from any U.S. withholding. Mexican residents may claim a foreign tax credit for US taxes withheld, subject to applicable limitations.

Determine residence and payment source first, then assess any domestic exemption, the treaty category, beneficial ownership and limitation-on-benefits eligibility, relationship and contingent-interest restrictions, tax forms, and any negotiated gross-up. Article 11's ordinary ceilings distinguish 4.9% for qualifying bank/insurance loans and specified traded securities, 10% for interest paid by banks or specified original-seller machinery/equipment credit where the lower category does not apply, and 15% for other ordinary interest. Specified government and other exemptions, special exclusions, and the treaty protocols must also be considered. Related-party status does not itself confer a concession and may defeat an exemption. These categories are not a rate-selection shortcut for a particular seller note.

If the buyer is a Mexican entity paying interest to a US seller, Mexican withholding rules may also apply to those interest payments under the LISR.

Analyze unstated interest or original issue discount under IRC §§1274 and 483, including their exceptions and contingent-payment rules. Section 7872 can matter for separately covered below-market loans; it is not a universal seller-financing rule. See IRS Publication 537. Analyze original-issue discount, installment interest and cross-border withholding under the actual instrument and taxpayer facts before fixing the payment schedule; IRS Publication 515 addresses the U.S. withholding framework.

IX. Practical Documentation Checklist

Consider the following, as applicable to the negotiated transaction:

A promissory note specifying principal, interest rate, maturity, amortization schedule, and acceleration triggers.
A security agreement granting the seller a security interest in described collateral (assets of the buyer or target company).
The appropriate U.S. perfection method (filing, control, possession, or another statutory method) under the governing collateral and debtor-location rules.
The appropriate Mexican security instrument for the relevant movable collateral (for example, a prenda sin transmisión de posesión or other applicable device), documented with the formalities required for that instrument and collateral, plus any required RUG registration; for Mexican real property, a hipoteca executed in the required form before a Mexican notary and registered in the applicable Registro Público de la Propiedad.
A personal guarantee from the buyer's principal(s), specifying governing law and enforcement jurisdiction.
An intercreditor agreement if the buyer is obtaining bank financing, allocating negotiated lien/payment priority and recovery procedures; subordination is a commercial decision, not a universal requirement.
Representation and warranty insurance (if used) addresses specified breaches of representations and warranties under the acquisition agreement; it is not a substitute for credit support on the seller note, but may reduce overall deal risk.
Documentation of the treaty withholding arrangement and tax reporting obligations for both parties.

This checklist is non-exhaustive. Cross-border deals introduce additional variables (currency fluctuations, regulatory changes, jurisdictional disputes) that require transaction-specific customization. Also address assignment of the note, permitted setoffs, currency and payment place, lien searches, and continuation or renewal dates. Documentation improves the enforcement position without assuring recovery.

X. Conclusion

Seller financing is a legitimate tool for closing cross-border M&A when the buyer cannot pay full consideration at closing. Structure materially affects recovery prospects. Select collateral, guarantees, covenants, and priority terms in light of the actual credit risk and enforcement paths; a personal guarantee or subordination to a bank is not appropriate or required in every transaction.

A seller note issued without documentation is unsecured paper. Unsecured paper competes with trade creditors in bankruptcy. Where cross-border enforcement adds cost or delay, unsecured paper may have materially reduced recovery value.

Transaction structures that account for default scenarios tend to produce stronger enforcement positions. Many sellers do not believe default will occur. Default risk is often underestimated.

Common Questions

Why is seller financing more complex in a cross-border M&A deal?

Seller financing becomes more complex when the buyer, collateral, guarantors, or operating assets are located in different jurisdictions. The note must account for enforcement, tax withholding, currency, collateral perfection, and practical collection risk.

Does a U.S. UCC security interest cover Mexican assets?

As a general matter, U.S. UCC perfection turns on where the debtor is located, not on where the collateral physically sits, so a UCC filing against a U.S.-located debtor can perfect a security interest even in assets located in Mexico. The priority and effect of security in tangible assets located in Mexico generally require Mexican-law analysis. Confirm effectiveness, priority and enforcement under the applicable Mexican security regime; a U.S. filing alone does not establish those results. Reaching collateral in Mexico therefore typically requires separate Mexican-law security (for example, a non-possessory pledge registered in Mexico's movable-collateral registry), and cross-border deals usually coordinate the U.S. and Mexican collateral packages so the two systems line up. Outcomes turn on the specific assets, the debtor's location, and the deal structure, so this is general information rather than legal advice; consult counsel licensed in the relevant jurisdiction.

How can a seller improve enforceability of a cross-border seller note?

Common tools include careful choice-of-law and forum or arbitration provisions, dual-jurisdiction collateral filings (for example, UCC filings for US assets and the applicable Mexican registrations for Mexican collateral), third-party guaranties, covenants, reporting rights, default triggers, escrow or holdback mechanics, and local counsel review in each relevant jurisdiction. Forum choice matters a great deal cross-border: there is no US-Mexico treaty for direct enforcement of money judgments, so a US court judgment generally must clear a separate recognition (exequatur) proceeding in Mexico, while an arbitral award may use the New York Convention framework, subject to its requirements and defenses. The appropriate forum depends on the transaction and assets. These are tools that are commonly used to help strengthen enforceability and recovery, not assurances of any result. This is general information, not legal advice; enforceability turns on the specific facts, the governing law, and the jurisdictions involved, so a seller should consult counsel licensed in each relevant jurisdiction.

What withholding tax issues can arise on seller notes?

Interest on a seller note can be subject to withholding under U.S. domestic law, under Mexican domestic law, or both, depending on the residence of the payor, the beneficial owner, and the direction of the payment flow, and an applicable income tax treaty may reduce the otherwise-applicable source-country rate. Where the payment runs cross-border, the U.S. and Mexican sides are analyzed together, since the regime that governs and the rate that applies turn on the particular facts. Documentation such as the relevant tax forms (for example, Form W-8BEN or W-8BEN-E) and treaty-position support is typically put in place before payments begin; absent it, the payor generally withholds at the default rate. The specifics vary and facts drive outcomes, so confirm the treatment with tax counsel licensed in the relevant jurisdiction before relying on any particular position.

What happens if seller financing is poorly documented?

The seller may be left with an unsecured or difficult-to-enforce claim, especially if collateral is outside the forum where judgment is obtained. Poor documentation can turn a negotiated credit support package into a practical collection problem.

Related Insights

If seller financing is part of your deal structure, you may also want to review our insights on asset versus stock deal structure and the cross-border search fund model. Readers with live negotiations should consult a lawyer licensed in the relevant jurisdiction.

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.

Seller Financing in Cross-Border M&A: Structuring Promissory Notes to Improve Enforceability and Recovery