Accounting Services Contract Mexico

An Accounting Services Contract Mexico (Contrato de Prestación de Servicios de Contabilidad) is a written professional services agreement governed by Article 2606 of the Código Civil Federal (CCF) and the Ley del Impuesto Sobre la Renta (LISR) Article 85, by which a Contador Público Certificado (CPC) or an accounting firm (despacho contable) undertakes to provide bookkeeping, tax compliance, payroll processing, financial statement preparation, and related accounting services to a client (persona física or moral) in exchange for agreed professional fees (honorarios profesionales).

The legal framework for accounting practice in Mexico is structured across multiple statutes. The Código Civil Federal Article 2606 establishes the contract of professional services (contrato de prestación de servicios profesionales) as the governing form for arrangements between licensed professionals and their clients, imposing obligations of professional diligence (diligencia profesional), confidentiality (confidencialidad), and personal performance. The LISR Article 85 establishes the tax treatment of professional fees paid to accountants — deductibility for the client requires that payments be supported by a valid CFDI (Comprobante Fiscal Digital por Internet) issued by the accounting firm under Artículo 29 of the Código Fiscal de la Federación (CFF).

Accountants in Mexico must be Contadores Públicos Certificados (CPCs) registered with the Instituto Mexicano de Contadores Públicos (IMCP) and holding a valid Cédula Profesional issued by the Dirección General de Profesiones (DGP) of the Secretaría de Educación Pública (SEP) under the Ley Reglamentaria del Artículo 5 Constitucional. The IMCP issues CPCs who maintain their certification through continuing professional education (educación profesional continua). For statutory audit work (auditoría de estados financieros), accounting firms must be registered with the Comisión Nacional Bancaria y de Valores (CNBV) as auditores externos autorizados if they audit regulated financial entities.

The Servicio de Administración Tributaria (SAT) — Mexico's federal tax authority under the Secretaría de Hacienda y Crédito Público (SHCP) — extensively regulates accounting obligations. The CFF Article 28 requires that all empresas morales (legal entities) and many personas físicas maintain electronic bookkeeping (contabilidad electrónica) through the Sistema de Contabilidad Electrónica approved by the SAT. Monthly and annual declaraciones fiscales must be filed through the SAT's portal, and accounting firms typically act as the authorised representative (representante legal fiscal) of the client for these filings.

For payroll-related accounting services, the accounting firm must be familiar with the IMSS (Instituto Mexicano del Seguro Social) SUA (Sistema Único de Autodeterminación) for calculating and filing monthly employer social security contributions (cuotas patronales), the INFONAVIT (Instituto del Fondo Nacional de la Vivienda para los Trabajadores) bimonthly reporting obligations, and the Secretaría del Trabajo y Previsión Social (STPS) requirements for the electronic Registro de Nómina. The Ley del Seguro Social (LSS) Articles 15 and 38 impose strict deadlines on employers for IMSS registration and contribution payments — accounting errors causing late payment result in recargos (surcharges) and actualizaciones (inflation adjustments) under the CFF.

The LISR Article 85 on accounting for professional income (ingresos por actividad profesional) specifically governs how accounting firms declare their own professional fee income — a distinction relevant when negotiating the tax treatment of the retainer. For VAT (IVA) purposes, professional accounting services are subject to the standard 16% IVA rate under Article 14 of the Ley del Impuesto al Valor Agregado (LIVA), and the accounting firm must issue a CFDI with IVA separated from the base fee.

An Accounting Services Contract Mexico is required whenever a business (persona moral) or self-employed individual (persona física con actividad empresarial or régimen simplificado de confianza) engages a Contador Público Certificado or accounting firm to manage their tax compliance, bookkeeping, payroll, or financial reporting obligations under Mexican law.

The contract is needed by newly incorporated Sociedades Anónimas de Capital Variable (S.A. de C.V.) and Sociedades de Responsabilidad Limitada (S. de R.L.) registered in the Registro Público de Comercio (RPC) — all empresas morales must maintain accounting records compliant with the Normas de Información Financiera (NIF) issued by the Consejo Mexicano de Normas de Información Financiera (CINIF) and file monthly SAT declarations from the date of tax registration (alta ante el SAT) in the RFC (Registro Federal de Contribuyentes).

Personas físicas operating under the Régimen Simplificado de Confianza (RESICO) introduced by the Decreto DOF 12 November 2021 require accounting support to maintain their eligibility for reduced ISR rates (1–2.5% for professional income under $3.5 million MXN annually) — errors in RESICO filing that cause the taxpayer to exceed income thresholds can result in forced migration to the more complex Régimen de Actividades Empresariales y Profesionales with full SAT audit exposure.

Companies with employees require payroll accounting services to calculate and file monthly cuotas patronales to the IMSS, bimonthly INFONAVIT contributions, annual ISR withholding returns (declaración anual de retenciones), and profit-sharing calculations (PTU — Participación de los Trabajadores en las Utilidades) under Article 120 of the Ley Federal del Trabajo.

Businesses in regulated sectors — pharmacies, food manufacturers, importers, and exporters — require accounting services to manage the specific IVA acreditation rules, customs valuations, IEPS (Impuesto Especial sobre Producción y Servicios) obligations, and NOM (Normas Oficiales Mexicanas) compliance documentation that form part of the annual tax return (declaración anual) before the SAT.

A written Contrato de Prestación de Servicios de Contabilidad is also needed when a company is subject to a SAT audit (revisión de gabinete or visita domiciliaria) — it documents the scope of the accountant's mandate, protects both parties regarding the completeness of information provided, and establishes responsibility allocation for any penalties arising from SAT audit adjustments.

A valid Accounting Services Contract Mexico under the Código Civil Federal (CCF) Article 2606 and the LISR Article 85 must include the following essential elements to be professionally compliant and enforceable:

Identification of Parties and Professional Credentials: Full legal name, RFC, and domicilio of both the accounting firm or CPC (prestador del servicio) and the client (persona física or moral). The contract must include the accountant's Cédula Profesional number issued by the Dirección General de Profesiones (DGP) of the SEP, and the IMCP membership or CPC certification number. For audit services, the CNBV auditor registration number must be included.

Scope of Accounting Services: Precise description of each service included — monthly bookkeeping (contabilidad mensual) under the NIF framework; SAT electronic accounting (contabilidad electrónica bajo CFF Artículo 28); monthly preliminary declarations (declaraciones mensuales provisionales) for ISR and IVA; annual income tax return (declaración anual) for ISR and IEPS; payroll processing (nómina) including IMSS SUA calculations and INFONAVIT bimonthly filings; and preparation of financial statements (estados financieros) — Balance General, Estado de Resultados, and Estado de Flujos de Efectivo under the applicable NIF.

Client Responsibilities and Information Obligations: The client's obligation to provide complete, accurate, and timely information — bank statements (estados de cuenta), invoices (facturas CFDI), expense receipts (comprobantes de gastos), employee contracts, and tax notifications from the SAT — within agreed timeframes. A clear allocation of responsibility stating that accounting inaccuracies caused by incomplete client information are the client's liability, not the accountant's.

Deadlines and SAT Compliance Calendar: A schedule of SAT filing deadlines applicable to the client — monthly IVA and ISR provisional declarations (typically due by the 17th of the following month); IMSS monthly contributions (due the 17th of each month); INFONAVIT bimonthly contributions; annual ISR return (due 31 March for empresas morales, 30 April for personas físicas). The accountant's obligation to notify the client of SAT notifications, audit orders, and electronic review requests (revisión electrónica) received through the SAT's Buzón Tributario.

Representation Authority: Whether the accounting firm is authorised as representante legal fiscal of the client before the SAT, IMSS, INFONAVIT, and state tax authorities (Secretarías de Finanzas Estatales) — and the scope of that authority. A separate poder notarial or e.firma delegation may be required for full SAT representation.

Professional Fees, CFDI, and Payment: Monthly retainer fee (honorarios mensuales) or per-service fee structure in MXN, IVA (16%) separated per the LIVA, CFDI issuance obligation under CFF Article 29, and payment due dates. Adjustment mechanisms for inflation (INPC — Índice Nacional de Precios al Consumidor) and for additional services beyond the agreed scope.

Confidentiality: The accountant's duty of professional secrecy (secreto profesional) under the Código de Ética Profesional del IMCP — extending to all financial, tax, and business information of the client. The confidentiality obligation survives termination of the contract and continues for at least five years post-termination.

Liability for Errors and SAT Penalties: Allocation of responsibility for SAT penalties (multas), surcharges (recargos), and inflation adjustments (actualizaciones) arising from accounting errors — whether caused by the accountant's negligence or by incomplete client information. Professional indemnity insurance (seguro de responsabilidad profesional) requirements.

Forms-legal.com provides this Accounting Services Contract Mexico template as a practical starting point. Contracts involving statutory audit work, SAT dispute representation, or cross-border tax compliance should be reviewed by a CPC specialised in impuestos corporativos before execution to confirm compliance with current SAT criteria and NIF standards.