Testamentary Asset Declaration Mexico (Declaración de Bienes Testamentaria)

A Testamentary Asset Declaration Mexico (Declaración de Bienes Testamentaria) is a structured inventory document prepared by a testator (testador) — the person making a will — cataloguing all assets (bienes), liabilities (pasivos), financial accounts, intellectual property, digital assets, and other property interests that form part of or are relevant to their estate (herencia) under Mexican succession law, to be used in connection with the preparation or execution of a Testamento Público Abierto before a Notario Público. The declaration is grounded in CCF Articles 1500 and 1547, which address the testator's authority to dispose of their entire patrimony (patrimonio) through testamentary instruments and the specific rules governing the bequests of specific items (legados) as distinct from universal inheritance dispositions.

The Código Civil Federal (CCF) under Article 1295 establishes that the testador may freely dispose of all property that forms part of their estate (bienes propios — separate property) subject only to the alimentary obligations owed to economically dependent relatives under Article 1368 CCF. The Declaración de Bienes Testamentaria serves the critical function of establishing a clear, current, and comprehensive picture of the testator's patrimonial situation — enabling the Notario Público to draft a technically accurate testamento público abierto that correctly identifies assets, avoids ambiguity in bequest descriptions, and addresses all applicable legal constraints on testamentary freedom.

In Mexican succession practice, the failure to accurately describe assets in the will instrument creates significant problems during the procedimiento sucesorio: heirs dispute whether a particular asset was intended to be included in the described bequest; the Registro Público de la Propiedad requires precise real property descriptions matching the registered folio real before accepting an adjudicación deed; financial institutions require specific account identification before releasing funds to heirs; and the albacea cannot perform their inventory function without a starting reference point. The Declaración de Bienes Testamentaria addresses all of these concerns by providing the Notario Público with the detailed information necessary to draft an unambiguous will instrument.

Beyond its use in will preparation, the Declaración de Bienes Testamentaria serves important non-testamentary functions: it is a planning tool for the testator and their financial adviser to identify estate liquidity issues (whether the estate has sufficient liquid assets to cover funeral expenses, estate debts, and ISAI taxes without requiring heirs to sell real property prematurely); it identifies assets that may benefit from lifetime gifting (donación) to reduce the estate subject to succession proceedings and associated notarial fees (aranceles); it documents the marital estate for couples with sociedad conyugal to clarify which assets are community property (gananciales) and which are separate property (bienes propios); and it serves as evidence of the testator's patrimonial situation if the will is ever challenged on the grounds of incapacity or undue influence.

The Registro Nacional de Avisos de Testamento (RENAT), administered by the Asociación Nacional del Notariado Mexicano (ANNM) and accessible through Notarios Públicos nationwide, maintains records of all testamentos públicos abiertos executed in Mexico. When heirs search for a will after the testator's death, they query the RENAT to identify the Notaría and protocol number where the will was executed. A Declaración de Bienes Testamentaria that accompanies or references the RENAT registration number of the will facilitates efficient asset discovery by the albacea — particularly for assets held at financial institutions (bancos, AFORE, aseguradoras) that require RENAT confirmation before releasing funds to heirs. Updating the declaration periodically — whenever the testator acquires or disposes of significant assets, changes marital status, or experiences material changes in financial circumstances — ensures the will instrument remains accurate and reflects the testator's actual estate at the time of death.

A Testamentary Asset Declaration Mexico is needed as a preparatory instrument before every execution of a Testamento Público Abierto, and as a standalone estate planning document for anyone who wishes to systematically inventory their estate for succession planning purposes.

The declaration is needed when a testator is preparing to visit a Notario Público to execute a will — the notary requires a comprehensive understanding of the testator's assets to draft accurate descriptions of real property (with folio real numbers), bank accounts (with institution names and CLABE numbers), business interests (with RFC and share percentages), and other assets in the will instrument. Arriving at the notaría with a completed Declaración de Bienes Testamentaria dramatically reduces the time and cost of the notarial appointment.

The document is needed when a testator owns multiple types of assets across different categories — real estate in multiple states, bank accounts at several institutions, AFORE retirement savings, life insurance policies with beneficiary designations, business ownership interests, cryptocurrency holdings, intellectual property rights, vehicles, and personal property of significant value. A structured declaration ensures nothing is overlooked and that each asset receives appropriate testamentary treatment.

The declaration is particularly important when the testator is married under sociedad conyugal (community property regime) and needs to distinguish between their 50% share of community assets (disposable by will) and their spouse's 50% share (not disposable by the testator's will). This distinction must be clearly reflected in the will's asset descriptions to avoid confusion during the succession proceeding.

Estate planners, tax advisers (asesores patrimoniales), and Notarios Públicos recommend completing and updating this declaration whenever: the testator acquires or sells significant assets; the testator's marital status changes; a named heir or legatee in the existing will predeceases the testator; and as a minimum every three to five years as part of a comprehensive estate planning review. The declaration, kept confidentially with the testator's estate planning documents, provides the executor (albacea) with essential information for administering the estate.

The declaration is also needed when the testator has assets in multiple states or in foreign countries. Mexico's Código de Derecho Internacional Privado and the Código Bustamante (ratified by Mexico) govern the succession of real property located in Mexico regardless of the testator's nationality, while personal property succession follows the testator's domicile law. For testators with cross-border estates — real property in Mexico and in the United States, for example — a comprehensive Declaración de Bienes Testamentaria is the foundation for coordinating parallel succession proceedings and avoiding conflicts between the Mexican testamento and any foreign will instruments. The Secretaría de Relaciones Exteriores (SRE) and the Autoridad Central en materia de cooperación jurídica internacional handle requests for succession documentation in cross-border proceedings where Mexican authorities must coordinate with foreign courts or notaries.

A complete Testamentary Asset Declaration Mexico under CCF arts. 1500 and 1547 must contain the following elements to provide a sufficiently accurate foundation for will preparation and estate administration.

Testator Identification: Full legal name, CURP, RFC, date and place of birth, official identity document (INE, passport, or Tarjeta de Residencia), marital status, and marital regime (sociedad conyugal or separación de bienes). If married under sociedad conyugal, the declaration must identify assets acquired during marriage (subject to community property rules) separately from assets owned before marriage or received by inheritance or gift (bienes propios under CCF Article 182-E).

Real Property Inventory: For each real property owned or co-owned: full property description (street address, colonia, C.P., municipio, state); folio real from the Registro Público de la Propiedad; clave catastral (cadastral key) from the predial (property tax) authority; surface area (superficie) in square meters; type of property (casa habitación, departamento, local comercial, terreno, nave industrial, rancho); current assessed value (valor catastral) and estimated market value (valor de mercado); ownership percentage (if co-owned); whether subject to a mortgage (hipoteca) or other lien — with the creditor institution, credit number, and outstanding balance; and whether held in sociedad conyugal or as bienes propios.

Financial Accounts: For each bank account, investment account, or financial instrument: institution name; account or instrument type (cuenta de cheques, cuenta de ahorro, CETES, pagaré, fondo de inversión); account number and CLABE interbanking key; approximate balance as of the declaration date; whether the account has designated beneficiaries (beneficiarios) registered directly with the bank independent of the succession; and name of institution contact or branch.

Retirement and Insurance Assets: AFORE account number, AFORE institution (SURA, Citibanamex AFORE, Profuturo, PensionISSSTE, etc.), and approximate balance including mandatory contributions, employer contributions, and voluntary contributions. Life insurance policies: insurer name, policy number, sum assured (suma asegurada), and current designated beneficiaries. IMSS or ISSSTE pension rights and designated beneficiaries. Beneficiary designations on financial accounts and insurance policies operate independently of the will — beneficiaries designated with the institution receive the assets directly without succession proceedings.

Business and Corporate Interests: For each shareholding or membership interest: entity name (denominación social), RFC, type of entity (S.A. de C.V., S. de R.L., etc.), registered address; percentage of capital owned; acquisition cost and current estimated value; whether the shares or membership interests have transfer restrictions under the corporate bylaws (estatutos sociales) or shareholders' agreement (convenio de accionistas); contact information for the corporate secretary (secretario del consejo) or other reference person for succession purposes.

Vehicles and Movable Property: Vehicle registration details (placas, NIV/VIN, modelo, year, color, estimated value per Libro Azul, REPUVE registration status); valuable personal property (joyas, obras de arte, colecciones) with description and estimated value; and any other movable property of significant economic value.

Digital Assets: Cryptocurrency holdings (coin type, approximate quantity, exchange platform or wallet type, and instructions for the albacea to access the account), valuable social media accounts, domain names, and intellectual property registered with the Instituto Mexicano de la Propiedad Industrial (IMPI) or the Instituto Nacional del Derecho de Autor (INDAUTOR). For self-custodied wallets, a sealed envelope containing access instructions (not private keys) should be referenced here and stored separately with the Notario Público or albacea.

Liabilities and Obligations: Known debts and financial obligations, including mortgage balances (with outstanding principal, interest rate, monthly payment, and maturity date); personal loans; credit card balances; business debts for which the testator is personally liable; and any pending tax obligations (ISR, IVA, IMSS) identifiable from the most recent SAT Constancia de Situación Fiscal and from IMSS employer records.

Forms-legal.com provides this Testamentary Asset Declaration Mexico template as a planning tool and preparation guide for will execution before a Notario Público. Keep the completed declaration in a secure location known to your albacea and update it whenever your asset situation changes materially to ensure your Testamento Público Abierto remains accurate and effective.