Mexico’s move toward a 40-hour workweek is not merely a labor reform; it is a stress test for the country’s entire development model. The constitutional change was published in the Diario Oficial de la Federación on March 3, 2026, after congressional approval, and the government’s rollout plan is gradual: 46 hours in 2027, 44 in 2028, 42 in 2029, and 40 in 2030, with no reduction in salaries or benefits. Officials say roughly 13.4 million workers stand to benefit. (sidofqa.segob.gob.mx)

The political appeal is obvious. Mexico has long combined very long working hours with disappointing productivity. According to the OECD’s 2026 Economic Survey, the average worker in Mexico puts in 2,193 hours a year, far above the OECD average of 1,736. Yet the same report says productivity growth has been weak for two decades and that Mexico’s expansion has depended more on adding labor than on producing more per hour. In other words, the reform is asking a pointed question: if people already work exceptionally long hours, why is output still so modest? (oecd.org)

The answer leads straight to the central trade-off. A shorter week without lower weekly pay raises the hourly cost of formal labor. That pressure arrives just as Mexico is also pushing wages upward: the minimum wage rose 13% for 2026 to 315.04 pesos per day nationwide, and the government says its purchasing power has recovered 154% since 2018. The OECD has therefore urged caution, warning that further wage gains should remain aligned with productivity growth so they do not damage formal employment, especially for younger and lower-skilled workers. (mexicanpressagency.org)

This is where informality becomes decisive. INEGI reported that in the fourth quarter of 2025, 32.9 million people—55.0% of all employed workers—were in informal employment. That means the reform may improve life for millions in the formal sector while leaving a vast share of workers beyond its practical reach. It also suggests a deeper risk: if compliance becomes too costly for some firms, they may respond by hiring less formally or shifting activity outside regulation. That is an inference, not a certainty—but in Mexico, it is precisely the shadow of informality that makes every gain in dignity potentially collide with the economics of survival. (inegi.org.mx)