Co-Ownership Agreement Mexico

A Co-Ownership Agreement (Acuerdo de Copropiedad de Inmueble) Mexico is a written contract between two or more persons (copropietarios) who jointly own an undivided interest (alícuota parte) in a real property, governing the rights and obligations of each co-owner regarding use, expenses, income, administration, and eventual disposition of the property, under the legal framework established by Articles 938 through 979 of the Código Civil Federal (CCF) published in the Diario Oficial de la Federación on 26 May 1928.

Copropiedad (co-ownership or tenancy in common) arises in Mexico through multiple circumstances: inheritance (herencia) when two or more heirs receive undivided interests in real property; joint purchase (compra en conjunto) by spouses under the sociedad conyugal regime or by business partners; family property arrangements where multiple relatives contribute to acquire a single property; and subdivision of previously unified properties among former co-owners. Under Article 938 CCF, each copropietario owns an alícuota (proportional undivided share) of the whole property — not a specific physical portion — until a formal partition (partición) divides the property into separately titled units.

The Código Civil Federal establishes the default rules governing copropiedad in Articles 938–979. Article 942 CCF requires unanimous consent (acuerdo unánime) of all co-owners for decisions that alter or encumber the property (actos de disposición), while Article 943 CCF allows majority decisions (by value of interests, not number of co-owners) for acts of ordinary administration (actos de administración ordinaria). These default rules are inflexible in the absence of a written agreement — a single dissenting co-owner with a 1% interest can block any act of disposition, creating significant practical problems in family-owned properties.

A properly drafted Acuerdo de Copropiedad allows the co-owners to supplement and customise the default CCF rules within the limits of mandatory law. The agreement can establish: a managing co-owner (administrador) for day-to-day decisions; a decision-making threshold for specific acts (e.g., supermajority of 75% for lease agreements, unanimous consent only for mortgage or sale); a mechanism for resolving deadlocks (bloqueos de decisión) through mediation or arbitration; rules for allocating use of specific areas or time periods among co-owners; procedures for admitting or transferring ownership interests to third parties; and conditions for initiating the partition (división de la copropiedad) under Article 939 CCF.

The right to demand partition (acción de división de la copropiedad) under Article 939 CCF is a fundamental right of every co-owner that cannot be permanently waived by contract — any agreement prohibiting partition for more than 5 years is void under Mexican civil law, though the parties may agree not to partition for up to 5 years at a time, renewable by mutual agreement. This imprescriptible right means that a co-owner who becomes dissatisfied with the arrangement can always force a division, either through mutual agreement (partición convencional) or through judicial proceedings (partición judicial) before the Juzgado Civil competente.

For SAT and LISR tax purposes, income generated by a co-owned property (rental income, for example) is attributed proportionally to each co-owner according to their alícuota, and each co-owner reports and pays ISR on their share independently. The SAT has issued criteria (criterios normativos) specifying how copropietarios must report rental income from jointly owned properties under Chapter III of Title IV LISR.

A Co-Ownership Agreement Mexico is needed whenever two or more persons own real property jointly in Mexico and wish to establish clear rules governing their rights, obligations, and decision-making authority, avoiding the default CCF rules that frequently produce disputes and deadlocks.

Inheritance situations generate the most common need for a formal co-ownership agreement in Mexico. When a parent dies leaving a house, apartment building, or commercial property to two or more children as herederos universales, the resulting copropiedad without a governing agreement creates immediate practical problems: who pays the property tax (predial); who authorises repairs; who can lease the property and on what terms; how rental income is distributed; and what happens if one heir wants to sell their interest. A written acuerdo de copropiedad prevents these disputes before they arise.

Joint property purchases among unrelated investors or business partners require a co-ownership agreement from the moment of acquisition. When two entrepreneurs jointly purchase a commercial building, apartment complex (edificio de departamentos), or rental land, they need written rules for: managing the property; distributing rental income; financing improvements and major repairs; and eventually exiting the investment either through sale to a third party, buy-out of one partner by the other, or formal partition.

Sociedad conyugal arrangements where spouses jointly own real property benefit from a co-ownership agreement that supplements the matrimonial property regime (régimen de sociedad conyugal under Articles 183–199 CCF) with specific rules for managing investment properties they own together outside their matrimonial home.

Ejido communities that have regularised individual parcel ownership through PROCEDE (Programa de Certificación de Derechos Ejidales) sometimes produce situations where multiple family members jointly own a regularised parcel — a co-ownership agreement under CCF rules governs their relationship after regularisation transforms the ejido right into private property.

Developer-buyer relationships during pre-sales of housing developments sometimes produce temporary co-ownership situations during construction — a written agreement governs the rights of all buyers during the period before the condominium regime (régimen de condominio under the Ley de Propiedad en Condominio) is formally established through the escritura pública del régimen.

A valid Acuerdo de Copropiedad de Inmueble Mexico under Articles 938–979 of the Código Civil Federal must contain the following essential elements to supplement the default CCF rules effectively and protect all co-owners:

Identification of Co-Owners and Shares (Copropietarios y Alícuotas): Full legal names, RFCs, and addresses of all co-owners, with the percentage alícuota (undivided interest) of each. The alícuotas must sum to 100%. The alícuota of each co-owner determines: their share of expenses and income; their voting weight in decisions; and their proportional entitlement upon partition or sale. The property title (escritura pública) or court partition order should already reflect these alícuotas in the Registro Público de la Propiedad.

Property Description (Descripción del Inmueble): Full legal description of the co-owned property including address, cadastral key (clave catastral), folio real in the Registro Público, surface area, and improvements. The description must match the property as registered.

Administration Structure (Estructura de Administración): Designation of an administrador (managing co-owner or third-party manager) responsible for day-to-day administration — collecting rents, paying predial and utilities, coordinating routine maintenance, and executing agreements within approved budgets. The agreement should specify the administrador's term, compensation (if any), removal procedure, and reporting obligations to other co-owners.

Decision-Making Rules (Reglas de Toma de Decisiones): Decision thresholds for different categories of acts — ordinary administration (mayoría simple by alícuota value, supplementing Article 943 CCF); extraordinary administration (supermajority of 67% or 75%); acts of disposition (unanimous consent or supermajority, noting the CCF Article 942 default of unanimity for dispositions). The agreement can establish that certain leases above a threshold rent or term require unanimous consent while smaller leases require only simple majority.

Expense Allocation (Distribución de Gastos): Rules for proportional allocation of all property expenses among co-owners — property tax (impuesto predial), insurance premiums (primas de seguro), maintenance and repair costs, administration fees, and any mortgage payments. Each co-owner's obligation is proportional to their alícuota unless the agreement establishes a different allocation for specific expenses.

Income Distribution (Distribución de Ingresos): Rules for distributing rental or other income from the property — typically proportional to alícuotas, with a specified frequency (monthly, quarterly) and payment method. The agreement should establish a co-ownership bank account (cuenta bancaria de la copropiedad) for all income and expense transactions.

Right of First Refusal (Derecho del Tanto): Under Article 973 CCF, co-owners have a statutory right of first refusal (derecho del tanto o tanteo) when another co-owner wishes to sell their interest to a third party. The selling co-owner must first offer their interest to the other co-owners at the same price and terms as those offered by the third party. The agreement should specify the notification procedure and the response period (Article 973 CCF provides a default of 8 days for real property).

Partition Rules (Reglas de Partición): While the right to demand partition cannot be permanently waived, the agreement can establish: a prohibition on partition for up to 5 years (renewable); a preferred partition method (physical division, assignment to one co-owner with payment to others, or public auction); and a valuation method (appraisal by certified valuador registered with the Instituto de Administración y Avalúos de Bienes Nacionales — INDAABIN) for buyout calculations.

Forms-legal.com provides this Acuerdo de Copropiedad de Inmueble template as a practical reference. Co-ownership agreements involving high-value properties or multiple co-owners should be reviewed by a Licenciado en Derecho and protocolised ante Notario Público, particularly if the agreement modifies the default partition or disposition rules that affect third-party rights.