Prenuptial Agreement — Community Property Mexico (Capitulaciones Matrimoniales — Sociedad Conyugal)

A Prenuptial Agreement establishing Community Property Mexico (Capitulaciones Matrimoniales bajo el Régimen de Sociedad Conyugal) is a formal notarial contract executed between two persons before their civil marriage (matrimonio civil) — or in some circumstances during the marriage — that establishes the matrimonial property regime (régimen patrimonial del matrimonio) governing ownership, administration, and dissolution of assets acquired by the spouses. The legal foundation is the Código Civil Federal (CCF) Articles 178 through 200, applicable in cases governed by federal law, with corresponding provisions in each state's Código Civil — for the Ciudad de México, the Código Civil para el Distrito Federal governs, while states such as Jalisco, Nuevo León, and Veracruz have their own civil codes with substantially similar provisions.

CCF Article 178 establishes that future spouses (futuros consortes) may stipulate their patrimonial conditions by means of capitulaciones matrimoniales (marriage contracts) before or after the marriage celebration — the most common choices being sociedad conyugal (community property) or separación de bienes (separate property). Under the sociedad conyugal regime, Article 183 CCF creates a community estate (patrimonio común) comprising all property and rights acquired by either spouse during the marriage through onerous title (título oneroso), such as purchase, employment income, or business activity — while property owned before marriage or acquired during marriage by gratuitous title (donación, herencia, or legado) remains the individual property (bien propio) of the acquiring spouse unless the parties expressly agree to include it in the community.

The sociedad conyugal generates a community interest (participación en la comunidad) for each spouse — typically equal shares (50/50), though Article 189 CCF allows the parties to agree on unequal proportions, provided neither party is left with less than 25% of the community assets. This proportionality protection distinguishes Mexican law from some civil law systems that allow unlimited waiver. The community property regime is the default regime under many state civil codes when spouses do not expressly stipulate otherwise before the Registro Civil officer (Oficial del Registro Civil) at the time of marriage — Article 178 CCF allows oral stipulation at the time of marriage registration if no prior written capitulaciones exist.

The capitulaciones matrimoniales under sociedad conyugal must be executed before a Notario Público to have full legal force under CCF Article 179, and must be registered simultaneously with the marriage act in the Registro Civil — the Juez del Registro Civil annotates the matrimonial property regime in the marriage certificate (acta de matrimonio). This registration creates effect against third parties, particularly creditors and financial institutions. Changes to the regime during the marriage (modificación del régimen patrimonial) also require notarial formalisation and Registro Civil annotation under CCF Article 186.

The sociedad conyugal differs fundamentally from simple co-ownership (copropiedad under CCF Article 938) — under copropiedad, each co-owner has a defined aliquot part of a specific asset; under sociedad conyugal, each spouse has a proportional interest in the entire community estate as a universal patrimony, with neither spouse able to dispose of their share without dissolution of the community. This universal character gives the sociedad conyugal significant creditor protection features but also means that both spouses' creditors can potentially reach community assets, subject to priority rules under CCF Articles 193 through 196.

Capitulaciones matrimoniales establishing sociedad conyugal in Mexico are needed whenever two persons planning to marry wish to expressly establish, customise, or document the community property regime that will govern their economic relationship during marriage. In many Mexican states, absence of express capitulaciones results in automatic application of sociedad conyugal as the default regime — but executing formal written capitulaciones is strongly advisable to define the scope of the community, administration rights, and dissolution procedures with legal certainty.

The agreement is particularly important when one or both future spouses own significant pre-marital assets (bienes propios) — real property, shares in companies, intellectual property, AFORE retirement savings — that they wish to either include in the community or expressly exclude as bienes propios. Without written capitulaciones specifying the treatment of pre-marital assets, disputes about their character may arise upon dissolution. A written agreement documenting the initial inventory (inventario inicial) of each spouse's pre-marital assets provides an evidentiary baseline for any future liquidation of the community estate.

The sociedad conyugal agreement is required before financial transactions involving jointly managed property. Banks and Sofomes making mortgage loans (créditos hipotecarios) to married couples routinely require production of the acta de matrimonio annotated with the property regime and, where the sociedad conyugal exists, require both spouses to sign the mortgage deed (escritura hipotecaria) or provide notarised consent, since mortgaging community property without spousal consent is voidable under CCF Article 2915.

Business owners forming a new company (constitución de sociedad) during the marriage must consider whether the business assets and shares are community property (bienes de la sociedad conyugal) or individual property. The capitulaciones can expressly provide that business assets, professional income from an established practice, or intellectual property royalties remain bienes propios — this is particularly relevant for entrepreneurs in the Ciudad de México and Monterrey who wish to protect business interests from the community.

Foreign nationals marrying a Mexican citizen or residing in Mexico should execute written capitulaciones because the Código de Bustamante (the inter-American private international law convention) and Mexico's private international law rules under CCF Article 13 can create uncertainty about which country's matrimonial property law applies — a written notarised agreement executed in Mexico under Mexican law resolves this conflict by constituting an express choice of law.

Valid Capitulaciones Matrimoniales establishing sociedad conyugal Mexico under CCF Articles 178 through 200 must contain the following essential provisions to be enforceable and to satisfy Registro Civil registration requirements.

Identification of Future Spouses (Identificación de los Futuros Consortes): Full legal names, RFC, CURP, age, domicilio, nationality, marital status (soltero/a — confirming neither party has a prior undissolved marriage), and official ID details for each future spouse. If either party was previously married, the acta de defunción (death certificate) or acta de divorcio (divorce certificate) must be cited to confirm capacity to contract marriage under CCF Article 148.

Declaration of the Matrimonial Regime (Declaración del Régimen Patrimonial): Explicit statement that the parties adopt the sociedad conyugal as their matrimonial property regime under CCF Articles 183 through 189. The proportional participation of each spouse in the community (participación proporcional) — typically 50% each, but customisable under Article 189 CCF with a minimum 25% floor — must be stated.

Inventory of Pre-Marital Assets (Inventario de Bienes Propios): A detailed list (inventario) of all assets owned by each future spouse prior to the marriage that are declared bienes propios (individual property) excluded from the community estate. For real property, the clave catastral, RPPyC folio real, and deed reference must be included. For business interests, the company name, RFC, and Registro Público de Comercio inscription must be cited. AFORE accounts and individual retirement savings are typically listed as bienes propios.

Scope of the Community (Objeto de la Sociedad Conyugal): Specification of which assets and income streams will form part of the community — employment salaries (sueldos y salarios), business profits (utilidades empresariales), rental income (rentas de inmuebles), investment returns (rendimientos financieros), and assets acquired during the marriage. If the parties wish to include pre-marital assets in the community, each such asset must be explicitly listed with its current valuation.

Administration of Community Assets (Administración del Patrimonio Común): Under CCF Article 191, administration of community assets may be joint (administración conjunta) or entrusted to one spouse (administración delegada). The agreement should specify whether acts of administration (actos de administración) — such as leasing community property — require the signature of both spouses or may be performed by one alone, and whether acts of disposition (actos de dominio) — sale, mortgage, or gift of community assets — always require both signatures. Bank accounts, investment management, and authority to represent the community before the SAT and IMSS should also be addressed.

Dissolution and Liquidation (Disolución y Liquidación): Circumstances triggering dissolution of the sociedad conyugal under CCF Articles 200 through 205 — death of a spouse, judicial divorce (divorcio judicial), legal separation, or mutual agreement. The liquidation process: how the community assets will be inventoried (inventario de liquidación), appraised (avalúo), and divided between the spouses or their heirs in the proportions stipulated. If the parties wish to specify a particular liquidation procedure — such as mediation before the Centro de Justicia Alternativa of the Tribunal Superior de Justicia — this should be included.

Governing Law and Notarial Execution: Statement that the agreement is governed by the Código Civil applicable in the state where the marriage will be registered, that it must be executed before a Notario Público, and that it will be presented for annotation in the acta de matrimonio at the Registro Civil. Forms-legal.com provides this Prenuptial Agreement Community Property Mexico template as a starting point — all capitulaciones matrimoniales must be reviewed and formalised by a Notario Público, and the parties should consult a specialist in derecho familiar before signing to understand the full legal and fiscal consequences of the sociedad conyugal regime.