SAT Estate Tax Declaration Mexico (Declaración de Herencia SAT)

A SAT Estate Tax Declaration Mexico (Declaración de Herencia ante el Servicio de Administración Tributaria) is a formal tax filing document used to report inherited assets and determine the Impuesto sobre la Renta (ISR) obligations arising from a succession in Mexico. The document is governed primarily by the Ley del Impuesto sobre la Renta (LISR) published in the Diario Oficial de la Federación on 11 December 2013, specifically Article 93 fraction XXII, which establishes the conditions under which inherited assets are exempt from ISR, and by the Código Fiscal de la Federación (CFF) Article 31, which mandates the use of SAT-authorised electronic forms for tax declarations.

Under Article 93 fraction XXII of the LISR, income obtained through inheritance (herencia) or legacy (legado) is exempt from ISR provided certain conditions are met. The exemption applies to the first inheritance received — if the taxpayer has previously received a prior inheritance from any person, the second and subsequent inheritances are subject to ISR at the applicable individual income tax rates established in Articles 96 and 152 LISR. This creates a critical distinction that requires precise documentation of prior inheritance history at the time of filing the SAT Estate Tax Declaration Mexico.

The constitutional framework for inheritance taxation in Mexico derives from Article 31 fraction IV of the Constitución Política de los Estados Unidos Mexicanos, which obliges all persons to contribute to public expenditure proportionally according to their capacity (principio de proporcionalidad tributaria). The Suprema Corte de Justicia de la Nación (SCJN) has interpreted this principle to mean that windfall gains received through inheritance — which represent a real increase in net worth — may legitimately be subjected to income tax above the established exemption levels.

The SAT Estate Tax Declaration Mexico also serves as the primary instrument for documenting the Registro Federal de Contribuyentes (RFC) and CURP (Clave Única de Registro de Población) identifiers of the heir (heredero), the decedent (de cujus), the legal basis for the succession (testamento otorgado ante Notario Público, intestate succession by court order, or legacy under a will), and the inventory and valuation (avalúo) of transferred assets — including real property (bienes inmuebles), movable property (bienes muebles), financial instruments (instrumentos financieros), bank accounts (cuentas bancarias), and business equity interests (acciones y partes sociales).

For real property received through inheritance, the fiscal cost (costo fiscal) used in future capital gains calculations is established at the date of the decedent's death, based on a certified avalúo prepared by a perito valuador authorized by the Instituto de Administración y Avalúos de Bienes Nacionales (INDAABIN) or by an authorized institution under the Código Fiscal de la Federación. This valuation is critical because when the heir later sells the inherited property, the capital gain (ganancia de capital) subject to ISR under Articles 119 through 128 LISR is calculated as the difference between the sale price and this inherited fiscal cost, adjusted for inflation using the Índice Nacional de Precios al Consumidor (INPC) under CFF Article 17-A.

The process of administering an inheritance in Mexico typically involves the Notaría Pública (notary public) as the central institutional actor: the testamento público abierto is typically executed before a Notaría and registered in the Registro Nacional de Avisos de Testamento (RENAT) operated by the Consejo Nacional del Notariado; intestate succession is processed through the Juzgado Familiar or Juzgado Civil competente; and the transfer of real property to heirs must be formalised through an escritura pública of adjudicación before a Notaría and recorded in the Registro Público de la Propiedad (RPP) of the relevant state. The SAT declaration fits within this broader legal and administrative process.

A SAT Estate Tax Declaration Mexico is required whenever a taxpayer in Mexico receives assets through inheritance or legacy (legado) and needs to determine their ISR obligations under Article 93 fraction XXII of the LISR. The declaration is needed in the following specific circumstances.

First Inheritance — Exemption Confirmation: When a Mexican resident taxpayer (persona física residente en México) receives a first inheritance, the SAT Estate Tax Declaration Mexico is used to confirm and document the exemption from ISR under Article 93 fraction XXII LISR. Although the income may ultimately be exempt, the SAT requires that all income — including exempt income — be declared in the annual ISR return (declaración anual) filed through the portal del contribuyente using the taxpayer's RFC. The declaration provides the documentary basis for claiming the exemption without triggering automatic audit flags.

Second or Subsequent Inheritance — ISR Payment: When a taxpayer has previously received any inheritance from any person (whether parents, grandparents, spouse, or unrelated testators), any subsequent inheritance received by that same taxpayer is fully subject to ISR at the applicable marginal rate under Article 152 LISR. In this situation, the SAT Estate Tax Declaration Mexico becomes the mechanism for calculating and reporting the taxable gain, withholding obligations if applicable, and payment through the SAT's portal using the Declaración Anual Personas Físicas module or through provisional payments (pagos provisionales) under Article 150 LISR.

Real Property Inheritance — Fiscal Cost Registration: When real property (casas, departamentos, terrenos, locales comerciales, naves industriales) is transferred through inheritance, the SAT declaration establishes the fiscal cost (costo de adquisición) for future capital gains tax purposes. Under Article 124 LISR, when the heir eventually sells the property, the gain is computed using this registered fiscal cost, adjusted by INPC inflation factors per CFF Article 17-A. Registering the fiscal cost immediately upon inheritance avoids disputes with the SAT in future transactions.

Financial Asset Inheritance — CNBV and SAT Coordination: When the inherited assets include bank accounts, investment funds (fondos de inversión), brokerage accounts (cuentas de casas de bolsa), or insurance policies (pólizas de seguro de vida), Mexican financial institutions regulated by the Comisión Nacional Bancaria y de Valores (CNBV) require proof of the SAT tax status of the inheritance before releasing funds to the heir. The SAT Estate Tax Declaration Mexico or the constancia de no obligación fiscal serves this institutional clearance function.

Estate Administration and Probate: The SAT declaration is needed whenever a succession is being administered through the judicial succession process (juicio sucesorio intestamentario or testamentario) before the Juzgado Familiar or Civil. The court-appointed albacea (executor) is responsible under Article 1679 of the Código Civil Federal for ensuring all fiscal obligations of the estate are met before asset distribution. Evidence of compliance with CFF Article 31 and LISR Article 93 is routinely required by Mexican courts before issuing the auto de adjudicación (court order of asset transfer).

A complete SAT Estate Tax Declaration Mexico under LISR Article 93 fraction XXII and CFF Article 31 must contain the following essential elements to be valid and to meet SAT audit standards.

Identification of Heir (Heredero): Full legal name, RFC (Registro Federal de Contribuyentes) assigned by the SAT, CURP (Clave Única de Registro de Población) issued by RENAPO, official identity document number (INE/IFE credential, pasaporte, or cédula profesional), tax domicile (domicilio fiscal) as registered with the SAT, and CURP of the heir. For non-resident heirs (herederos no residentes en México), the declaration must include the foreign taxpayer identification number and comply with any applicable tax treaty (Convenio para Evitar la Doble Imposición — CDI) between Mexico and the heir's country of residence.

Identification of Decedent (De Cujus): Full legal name, RFC if known, CURP, date of death (fecha de fallecimiento), and place of death (lugar de fallecimiento). The official death certificate (acta de defunción) issued by the Registro Civil is required as supporting documentation and must be attached to the declaration.

Legal Basis for Succession: Whether the inheritance is testate (por testamento) or intestate (ab intestato / intestamentaria), the relevant court order (auto de declaración de herederos), or the instrument granting legal authority to the heir — including the escritura pública of the testamento otorgado ante Notario Público and its registration folio in the Registro Nacional de Avisos de Testamento (RENAT), or the judicial resolution of the juzgado competente in intestate cases.

Inventory and Valuation of Inherited Assets (Inventario y Avalúo): A complete inventory of all assets transferred — classified by type: bienes inmuebles (real property) with Registro Público de la Propiedad folio number, clave catastral, and certified INDAABIN or authorised-institution avalúo; bienes muebles (vehicles, art, equipment) with serial numbers and market value; cuentas bancarias and instrumentos financieros with institution name, account number (last 4 digits per LFPDPPP), and balance at date of death; and acciones/partes sociales with company RFC, number of shares, and fiscal cost per share.

Exemption Calculation under LISR Article 93 Fraction XXII: A clear statement of whether this is the first inheritance received by the heir (triggering full exemption) or a subsequent inheritance (subject to ISR). If a subsequent inheritance, the declaration must include the calculation of the taxable base, applicable INPC adjustment under CFF Article 17-A, ISR rate per Article 152 LISR, tax payable, and any tax withheld by the notary (retención por el fedatario) under CFF Article 29-B.

Fiscal Cost Registration for Real Property: For each inherited real property, the registered fiscal cost per square metre, total fiscal cost, date of valuation, name and registration number of the perito valuador, and the methodology used (comparables de mercado, ingreso, or cost approach) under INDAABIN guidelines. This entry creates the official fiscal cost record (ficha de costo fiscal) that the heir will use in any future sale declaration under Article 119 LISR.

SAT e.firma and RFC Validation: The declaration must be submitted electronically through the SAT portal (portal.sat.gob.mx) using the heir's e.firma (formerly known as FIEL — Firma Electrónica Avanzada) under CFF Articles 17-D and 17-F, or through an authorised tax representative (representante fiscal) appointed by poder notarial. Paper declarations are not accepted for most individual taxpayers.

Forms-legal.com provides this SAT Estate Tax Declaration Mexico template to help heirs and their tax advisors organise the required information before filing. Every inheritance involving real property, business interests, or assets exceeding the annual ISR exemption threshold should be reviewed by a Contador Público Autorizado (CPA) or licenciado en derecho fiscal before submission to the SAT, given the complexity of INPC adjustments, inter-state property transfers, and potential double-taxation treaty implications for foreign heirs. The SAT's Administración General de Grandes Contribuyentes and regional offices have authority to audit inheritance declarations for up to five years under CFF Article 67.