Employment Offer Letter Mexico (Carta de Oferta de Empleo)

An Employment Offer Letter Mexico (Carta de Oferta de Empleo) is a formal written communication from an employer (patrón) to a prospective employee (trabajador) summarising the key terms of a proposed employment relationship before the formal Contrato Individual de Trabajo is signed. While the Ley Federal del Trabajo (LFT) Article 25 sets out the mandatory contents of the employment contract itself — rather than the offer letter — the Carta de Oferta de Empleo serves as the pre-contractual instrument through which the employer communicates the proposed conditions, allows the candidate to review and accept them, and establishes a documented record of the terms agreed before the formal commencement of the employment relationship.

Under Mexican labour law, the offer letter occupies a legally significant position: although it does not substitute for the written employment contract required by Article 24 LFT, a candidate who accepts an offer letter and commences work on the agreed start date creates a de facto employment relationship (relación de trabajo) that the LFT recognises and protects even if no formal contract is ever signed. Article 21 of the Ley Federal del Trabajo establishes the presumption of the existence of the employment contract and the employment relationship — meaning that once work begins, the statutory minimum benefits apply automatically regardless of the existence of a written agreement.

The Carta de Oferta de Empleo must be distinguished from a mere informal communication or recruitment email: a properly drafted offer letter constitutes a formal legal offer (oferta en términos del Código Civil Federal Articles 1794 and 1798) that, once accepted by the candidate, may be legally binding on the employer. If the employer withdraws a formal written offer after acceptance and before the start date without legal justification, the candidate may have a claim for damages (daños y perjuicios) under the Código Civil Federal Article 2104 for breach of the pre-contractual obligation, particularly where the candidate resigned from previous employment in reliance on the offer.

For multinational companies transferring employees from foreign subsidiaries to Mexican operations, the Carta de Oferta de Empleo is typically the vehicle through which the local Mexican employment terms are communicated and agreed before the formal transfer — the letter must specify the applicable law (Ley Federal del Trabajo), the Mexican entity that is the employing patrón (registered SA de CV or S de RL), and confirm IMSS registration obligations under Article 15 of the Ley del Seguro Social.

The Secretaría del Trabajo y Previsión Social (STPS) Inspección del Trabajo reviews offer letters and employment contracts during audits to verify compliance with Article 25 LFT minimum contents and to confirm that agreed benefits meet or exceed statutory minimums. An offer letter that specifies benefits below the LFT minimums — for example, fewer than 12 vacation days for the first year after the 2022 reform to Article 76 LFT, or an aguinaldo below 15 days under Article 87 LFT — is voidable to the extent of the shortfall under Article 5 LFT, which nullifies contractual provisions less favourable than the statutory minimum.

An Employment Offer Letter Mexico is required in practice whenever a Mexican employer makes a formal job offer to a selected candidate — whether for a new hire, a promotion to a different position, a transfer to a different location or entity, or a re-engagement after a period of separation.

The Carta de Oferta de Empleo is needed when an employer wants to document the agreed employment terms before the candidate's official start date and before the formal Contrato Individual de Trabajo is signed, providing both parties with a written record of the agreed compensation, benefits, position, and conditions that will be reflected in the employment contract. This protects the employer from candidates who claim different terms were offered verbally, and protects the candidate from employers who attempt to change terms between the offer and the contract.

The letter is required when hiring for management, technical, or specialised roles where the compensation package includes components beyond the statutory minimum — performance bonuses, stock options, vehicle allowances, private medical insurance, private life insurance, savings funds (caja de ahorro), or food vouchers (vales de despensa). Documenting these superior benefits (prestaciones superiores a la ley) in the offer letter establishes their contractual nature and prevents the employer from later arguing they were discretionary gratuities.

For roles subject to immigration requirements — positions filled by foreign nationals (extranjeros) who need a Tarjeta de Residencia Temporal con permiso para trabajar from the Instituto Nacional de Migración (INM) — the Carta de Oferta de Empleo is a mandatory supporting document for the immigration application. The INM requires a formal written offer from the Mexican employer specifying the position, salary, and duration of the engagement before granting work authorisation.

The offer letter is also needed during mergers and acquisitions (fusiones y adquisiciones) when the acquiring company needs to make formal offers to key employees of the acquired entity, documenting the new employment terms and any retention commitments before the acquisition closes. Under Article 41 of the Ley Federal del Trabajo, the substitution of employer (sustitución patronal) does not terminate employment relationships — but where terms are being modified, a formal offer process with written acceptance protects both parties from disputes about what was agreed during the transition.

A valid Employment Offer Letter Mexico should address the following elements to serve its pre-contractual purpose and to comply with the spirit of Ley Federal del Trabajo Article 25.

Identification of the Offering Employer: Full legal name (razón social) of the offering company, RFC (Registro Federal de Contribuyentes assigned by the SAT), Registro Patronal IMSS (employer IMSS registration number), domicilio fiscal, and the name and title of the signatory. Where the offer is made by an HR manager or director acting for the company, their authority to make binding offers on the company's behalf should be stated. This confirms to the candidate the identity of the legal entity that will be their patrón for LFT and IMSS registration purposes.

Candidate Information: Full name, RFC (if already obtained), and CURP (Clave Única de Registro de Población) of the candidate. The offer should confirm that final engagement is subject to completion of pre-employment verifications — credential checking (verificación de antecedentes), document authentication, medical examination (examen médico de ingreso), and reference checks — within a specified timeframe.

Position and Job Description: The specific job title (puesto de trabajo) and a summary of the principal duties and responsibilities, consistent with what will be stated in the Contrato Individual de Trabajo under Article 25 Section IV LFT. The reporting structure (supervisor directo) and work location (lugar de trabajo) should also be confirmed, including whether the position will involve teletrabajo (remote work) under Articles 330-A through 330-K LFT.

Start Date and Trial Period: The proposed commencement date (fecha de inicio de labores) and, if applicable, whether the position will include a trial period (período de prueba under Article 39-A LFT — maximum 30 days for general positions, 180 days for management or highly technical roles) or an initial training period (contrato de capacitación inicial under Article 39-B LFT — maximum 3 months). The offer should state the evaluation criteria applicable during the trial period.

Salary and Integrated Daily Wage: The agreed base salary (salario base) stated in daily or monthly terms, the Salario Diario Integrado (SDI) calculated under LFT Article 84 — integrating the proportional daily value of aguinaldo, prima vacacional, and all recurring benefits — and the payment frequency (weekly, biweekly, or monthly). The salary must meet or exceed the Salario Mínimo General (SMG) established by CONASAMI — $278.80 MXN/day general zone for 2025, $419.88 MXN/day in the northern border free zone (ZLFN).

Mandatory Statutory Benefits: Explicit confirmation of the minimum statutory benefits under the LFT and associated legislation: aguinaldo of at least 15 days' salary under Article 87 LFT; paid vacation of at least 12 working days for the first year under Article 76 LFT (reformed 2022); prima vacacional of 25% of vacation day pay under Article 80 LFT; PTU (Participación de los Trabajadores en las Utilidades) at 10% of annual taxable profits under Articles 117–131 LFT; IMSS registration under Ley del Seguro Social Article 15; and INFONAVIT contributions of 5% SDI under Ley del INFONAVIT Article 29.

Superior Benefits: Any additional benefits above the statutory minimum — private medical insurance (seguro de gastos médicos mayores), life insurance, vehicle allowance (bono de automóvil), food vouchers (vales de despensa from Sodexo, Edenred, or other authorised issuers), savings fund (caja de ahorro), private pension plan (plan de pensiones privado), or annual performance bonus (bono de desempeño). The offer should specify whether these are guaranteed or discretionary.

Conditions Precedent: The specific conditions that must be satisfied before the offer becomes binding and before the candidate's start date — typically: satisfactory background check, verification of academic credentials (cédula profesional where applicable), clean medical examination, and provision of required documentation (INE/IFE credential, CURP certificate, RFC, NSS, passport or birth certificate). The offer should specify the deadline for satisfaction of conditions.

Confidentiality and IP: A reminder that the candidate will be required to sign a confidentiality agreement (acuerdo de confidencialidad) and an intellectual property assignment clause as part of the employment contract, under Ley Federal de Protección a la Propiedad Industrial (LFPPI) Article 82 and LFT Article 134 Fraction XIII.

Expiry of the Offer: The date by which the candidate must accept or decline the offer in writing, to prevent the offer from remaining open indefinitely. Standard practice in Mexico is 3 to 7 business days from the offer date.

Forms-legal.com provides this Employment Offer Letter Mexico template as a practical starting point for formalising the hiring process. Every offer letter should be reviewed by a licenciado en derecho laboral before delivery to ensure it accurately reflects the intended employment terms and complies with LFT minimum requirements.