A well-drafted contract does not replace the reality of the employment relationship, but it does help define and prove it. In Mexico, working conditions must be in writing, and the employer bears a significant part of the documentary burden when a dispute arises. In 2026, in addition to the contract, it is essential to build a file that is consistent with payroll, attendance, vacations, training and social security. The goal is not to accumulate paper, but to keep complete, locatable evidence that is consistent with what happens in practice.
Minimum content and types
Articles 24 and 25 of the Federal Labor Law require that conditions be documented in writing. The instrument must identify the parties, the type and duration of the relationship, the services, the workplace, the working hours, the salary, the manner and date of payment, training, rest days, vacations and the beneficiaries for benefits pending upon death. Temporary, project-based, seasonal, initial-training or trial-period arrangements require a cause and limits compatible with the law; choosing a label is not enough. If there is telework, equipment, costs, supervision, information security and reversibility must be added. The absence of a written document does not eliminate the worker's rights and is charged to the employer.
The file that accompanies the contract
The file must explain the complete employment history. Along with the contract, it is advisable to keep identification and necessary data, the job description, social-security enrollments and movements, payroll receipts, working-time controls, records of vacations and benefits, disciplinary notices, training, salary changes and subsequent agreements. Article 804 of the Federal Labor Law requires the employer to keep and produce various documents; the retention periods vary according to their nature and the duration of the relationship. Medical or sensitive information requires restricted access and a legitimate purpose. A digital file works if it allows authorship, integrity, date, availability and correspondence with the payroll and attendance systems to be evidenced.
Consistency over forms
Disputes often arise from contradictions: a contract states one work schedule, the time clock records another and payroll pays a third; the formal position does not match the actual duties; or a change is applied without an agreement. That is why there must be version control and periodic reconciliation between human resources, payroll, social security and operational managers. It is not advisable to request personal documents that are not necessary or to keep files without access and deletion rules. Before signing, both parties must receive a copy and understand its content. This summary is general information and does not replace the analysis of the relationship, the collective agreement or the applicable special regulation.
Key points
- Working conditions must be in writing, but their absence does not deprive the worker of rights.
- Temporary terms, the trial period and initial training require legal grounds and limits.
- The file must be consistent with payroll, attendance, benefits and social-security movements.
- Document retention is an employer obligation and also a central piece of evidence.
What to review
- Audit that each contract contains the elements of Article 25 and reflects the actual duties.
- Define a single file index, upload owners and access permissions.
- Reconcile the contract, working hours, salary, receipts, IMSS and position changes quarterly.