A New Legal Framework for Specialized Services

Mexico's outsourcing landscape was permanently transformed when reforms to the Ley Federal del Trabajo (LFT), the Social Security Law, and the Tax Code came into force in April 2021. The traditional model — where companies provided personnel to work under the direction of client companies — was largely prohibited. In its place, a more regulated framework emerged, centered on the REPSE registry.

Understanding your specific legal obligations under this framework is essential for any business that hires or provides specialized services in Mexico.

The Prohibition on Personnel Outsourcing (Subcontratación de Personal)

The reform explicitly prohibits the outsourcing of personnel — that is, a company cannot supply workers to a third party who directs and controls their work. The only permissible model is the provision of specialized services or specialized work, where the contractor retains direction and supervision over its own employees.

This distinction is legally critical. The work or service provided must be specialized in nature and must fall outside the beneficiary company's core corporate purpose (objeto social).

Key Legal Obligations for Service Providers (Prestadoras)

If your company provides specialized services to other businesses, you must:

  • Obtain and maintain a valid REPSE registration — operating without one is an infraction under federal labor law.
  • Include your REPSE folio number in every service contract with client companies.
  • Share monthly information with client companies about the workers assigned to their projects, including IMSS affiliation and salary data.
  • Retain employer-employee relationships with all workers you deploy — you are their legal employer, not the client.
  • Maintain current compliance with SAT, IMSS, and INFONAVIT at all times.

Key Legal Obligations for Beneficiary Companies (Contratantes)

If your company hires specialized service providers, you are also subject to compliance requirements:

  • Verify REPSE registration before signing any service contract with a provider.
  • Include the provider's REPSE folio in the service agreement.
  • Receive and review monthly compliance reports from your service providers regarding worker contributions.
  • Retain documentation of provider compliance for potential audits by STPS, SAT, or IMSS.
  • Ensure services are genuinely specialized and not simply a mechanism to circumvent direct employment obligations.

Joint Liability: Understanding Solidary Responsibility

One of the most significant legal consequences under the reform is joint liability (responsabilidad solidaria). If a specialized service provider fails to pay workers' wages, social security contributions, or profit sharing (PTU), the beneficiary company (client) can be held jointly liable for those unpaid obligations.

This makes due diligence on your service providers not just good business practice — it is a legal necessity.

Contractual Requirements

Every contract between a specialized service provider and a client company must include:

  1. The provider's REPSE registration folio number.
  2. A clear description of the specialized services or work to be performed.
  3. The estimated number of workers involved.
  4. The location(s) where services will be performed.
  5. A commitment to share periodic compliance information with the beneficiary company.

Penalties for Non-Compliance

Violations of the outsourcing reform can result in serious consequences:

  • STPS fines ranging from hundreds to thousands of times the daily minimum wage unit (UMA).
  • SAT consequences: non-deductibility of expenses paid to unregistered providers, and potential tax fraud implications.
  • IMSS liabilities: unpaid worker contributions assessed against the beneficiary company.
  • Contract invalidation: agreements with unregistered providers may be legally unenforceable.

Staying Compliant: Practical Steps

To maintain full legal compliance under Mexico's outsourcing reform:

  • Audit all current service provider contracts for REPSE compliance.
  • Implement a systematic process to verify provider REPSE status before contract renewal.
  • Establish internal controls to receive and archive monthly provider compliance reports.
  • Consult with a Mexican labor attorney if you are unsure whether a specific service arrangement qualifies as "specialized."
  • Monitor regulatory updates from STPS, SAT, and IMSS for any changes to compliance requirements.