Mexico's 40-Hour Workweek:
What Changes for Payroll

The phase-in schedule

The reform doesn't drop everyone to 40 hours overnight. It rolls out gradually, two hours less per year, starting January 1, 2027:

Wages and benefits can't be reduced as the hours come down. An employee working 46 hours in 2027 gets paid the same as they did under 48 hours today, this isn't a pay cut disguised as a schedule change.

What this means for overtime calculations

Overtime in Mexico is already calculated against the standard workweek, so as the standard drops, the overtime threshold drops with it. A shift structure that fits comfortably inside 48 hours today may start generating overtime hours in 2027 once the ceiling moves to 46, even if nobody changed the actual schedule.

If your operation runs extended shifts, rotating crews, or anything close to the current 48-hour ceiling, this is worth modeling now, not in December 2026.

What it doesn't change yet

For 2026, nothing changes operationally. The 48-hour standard still applies. What's changed is that the countdown has started, and companies with shift structures near the ceiling have a defined runway (2027 through 2030) to adjust before hitting the final 40-hour standard.

The compliance angle nobody's talking about

Most of what's published about this reform covers the legal mechanics: what the constitutional amendment says, what employers are technically required to do. What's missing is the operational side: how payroll systems recalculate overtime thresholds each year as the ceiling drops, and how a multi-year phase-in gets tracked without someone missing a year and running payroll against the wrong number.

How ADN handles this

At ADN Services, we track regulatory changes like this as part of ongoing payroll operations, not as a one-time alert you read and forget. As the workweek ceiling drops each year through 2030, we adjust the overtime calculations for your Mexico-based team automatically, so nobody's running last year's threshold by accident.

Let's talk about your operation in Mexico.

This article is for general informational purposes and doesn't constitute legal advice. Mexico's workweek reform phase-in schedule is set by law and could be adjusted by future regulation. For guidance on your specific payroll setup, consult your advisor.