# Mexico transition to 40-hour workweek > Live situation record from CLSTR: https://clstr.news/situations/mexico-transition-to-40hour-workweek > Updated: 2026-08-20T04:05:10.000Z. Sources: 18. Developments: 5. The May 2026 labor reform in Mexico caps overtime at four hours per week and imposes fines of up to 600,000 pesos for violations. Audits by the Ministry of Labor and the Mexican Social Security Institute will treat regular overtime as part of the base salary unless firms keep detailed records. Deloitte warned that inadequate overtime controls could trigger inspections and solidary liability for subcontractors, while AMCHAM stressed the need for precise output-per-hour measurement, task digitalisation, and cross-departmental coordination. The reform sets a phased reduction from a 48-hour to a 40-hour week between 2027 and 2030. Coparmex Tijuana’s “La Nueva Era Laboral” forum, which gathered over 120 firms and specialists, emphasized that companies must redesign schedules and amend contracts by January 2027. Elisa Ibáñez Aldana, president of Coparmex Tijuana, described the reforms as a “new reality,” noting that early adaptation is essential for competitiveness under the T-MEC framework. María Luisa Ayala Vargas of the National Association of Business Lawyers highlighted the necessity of adjusting internal regulations and implementing electronic record-keeping. Walmart de México y Centroamérica (Walmex) is preparing to begin the gradual cut in January 2027, initially reducing the workweek by two hours to reach 46 hours. To maintain productivity, the retailer is focusing on automation and digital tools, including digital price tags and a new inventory management system. Walmex has already conducted pilot programs in approximately 100 stores to test 40-hour work weeks and optimize shifts. The reform also mandates that employees do not face reductions in wages or benefits during the transition. ## Timeline ### 2026-08-20: Walmart México prepares for Mexico's labor hour reduction Walmart de México is implementing automation and digital tools to prepare for Mexico's gradual reduction of the weekly work week from 48 to 40 hours, starting in January 2027. 5 sources. https://clstr.news/cluster/walmart-mxico-prepares-for-mexicos-labor-hour-reduction ### 2026-08-07: Coparmex Tijuana urges firms to adapt to Mexico's 40‑hour work week Coparmex Tijuana’s forum urged over 120 firms to prepare for Mexico’s 40‑hour work week and related labor reforms, stressing schedule redesign by Jan 2027 to stay competitive. 4 sources. https://clstr.news/cluster/coparmex-tijuana-urges-firms-to-adapt-to-mexicos-40hour-work-week ### 2026-07-25: Mexico Implements New Vacation Claim Rules and Phases in 40‑Hour Work Week Mexico's labor law now demands vacation be taken within six months of the anniversary, with a claim window of up to 18 months, and phases in a 40‑hour work week from 2027‑2030 without cutting wages. 6 sources. https://clstr.news/cluster/mexico-implements-new-vacation-claim-rules-and-phases-in-40hour-work-week ### 2026-07-21: Walmart Mexico to Start 40‑Hour Work Week in 2027 Walmart Mexico will cut weekly hours from 48 to 40 beginning Jan 2027, aligning with a new national labor law that also brings stricter workplace inspection requirements. 3 sources. https://clstr.news/cluster/walmart-mexico-to-cut-weekly-hours-to-40-starting-2027 ### 2026-07-15: Mexico tightens overtime rules and prepares shift to 40‑hour workweek Mexico's new labor reform caps overtime at four hours per week with fines up to 600,000 pesos and outlines a phased shift to a 40‑hour workweek, prompting companies to revamp payroll controls and operational‑by 2 sources. https://clstr.news/cluster/mexico-tightens-overtime-rules-and-prepares-shift-to-40hour-workweek --- Cite as: Mexico transition to 40-hour workweek. CLSTR, https://clstr.news/situations/mexico-transition-to-40hour-workweek