Article 66 of Mexico’s Federal Labor Law (Ley Federal del Trabajo, or LFT) lets an employer extend the workday beyond its normal limit only in extraordinary circumstances, and even then no more than three extra hours per day and no more than three days in the same week.1Justia Mexico. Ley Federal del Trabajo – Articulos 58 al 68, Jornada de Trabajo Those extra hours must be paid at double the regular hourly rate under Article 67, and any overtime that pushes past nine hours in a single week jumps to triple pay under Article 68.
The 3×3 Cap on Overtime Hours
The quantitative rule in Article 66 is simple: three extra hours maximum on any given day, and three days maximum in any given week. That produces a ceiling of nine authorized overtime hours per week.1Justia Mexico. Ley Federal del Trabajo – Articulos 58 al 68, Jornada de Trabajo
For a day-shift worker, whose normal shift is capped at eight hours under Article 61, the longest lawful workday runs eleven hours. Even during the busiest week, at least four days must sit at normal length. Night shifts (7 hours) and mixed shifts (7.5 hours) have lower baselines, so the same 3×3 rule produces shorter maximum days.
These caps operate as hard limits, not targets. Labor inspectors compare payroll records and timecards against the thresholds, and employers who consistently push right up to the ceiling tend to draw scrutiny.
What Counts as an Extraordinary Circumstance
Article 66 does not authorize scheduling overtime whenever business picks up. The statute limits extensions to “extraordinary circumstances,” which in practice means events outside normal, predictable operations: equipment failure, an unexpected surge in client demand, a deadline tied to a time-sensitive delivery. Routine understaffing and foreseeable seasonal peaks do not qualify.
The distinction matters in disputes before labor courts. An employer who schedules three hours of overtime every day for months has a hard time arguing each instance was genuinely extraordinary. If the extra hours look like a permanent feature of the operation, a labor authority can treat the pattern as evidence the employer needs to hire more staff rather than stretch the existing ones.
Article 66 is separate from Article 65, which covers true emergencies like accidents or equipment failures that put people at risk. Hours worked under Article 65 are paid at the regular rate, not the overtime premium, so the two provisions are worth keeping straight.
Double Pay Under Article 67
Every overtime hour worked within the 3×3 framework must be paid at 100% above the worker’s normal hourly rate, which most people call double time.1Justia Mexico. Ley Federal del Trabajo – Articulos 58 al 68, Jornada de Trabajo If your ordinary hourly rate is $100 MXN, each authorized overtime hour pays $200 MXN.
The calculation starts with your ordinary daily wage (salario diario ordinario), not the integrated daily wage that includes benefits. To find the hourly figure, divide your monthly salary by 30, then divide that daily wage by the number of hours in your shift type. For a day-shift worker earning $12,000 MXN per month:
- Daily wage: $12,000 ÷ 30 = $400 MXN
- Hourly rate: $400 ÷ 8 = $50 MXN
- Overtime hour (double time): $50 × 2 = $100 MXN
A night-shift worker on the same salary divides by 7 instead of 8, so the hourly rate and overtime pay run higher. Mixed-shift workers divide by 7.5. The shift-type divisor is one of the most common sources of payroll errors, so it’s worth checking your employer is using the right one. Overtime compensation must also appear as a separate line item on your pay stub.
Triple Pay When Overtime Exceeds Nine Hours in a Week
Article 68 requires that any overtime beyond nine hours in a single week be paid at 200% above the normal hourly rate, or triple time.1Justia Mexico. Ley Federal del Trabajo – Articulos 58 al 68, Jornada de Trabajo Using the $50 MXN example above, the tenth overtime hour in a week would pay $150 MXN, not $100 MXN.
The premium exists because those hours should not be happening at all. Crossing the nine-hour threshold means the employer has already breached the 3×3 cap. If your paycheck shows more than nine overtime hours in a single week and every one of them is paid at double time, the employer has underpaid you on each hour past the ninth.
Your Right to Refuse Overtime
Article 68 opens with a line many workers overlook: you are not obligated to work beyond the hours permitted in the workday chapter of the LFT. You can decline overtime. An employer cannot lawfully fire you or discipline you for refusing to stay past your scheduled shift, and doing so could expose the company to a wrongful termination claim.
Workplace dynamics make refusing overtime uncomfortable in practice, but the legal protection matters. If overtime is being used as a routine scheduling tool rather than a genuine emergency response, your right to say no is what prevents the arrangement from hardening into a permanent expectation.
How Overtime Pay Is Taxed
Overtime income gets partial protection from Mexico’s income tax (Impuesto Sobre la Renta, or ISR) under Article 93 of the ISR law, but the exemption depends on how much you earn.2SAT. Ley del ISR – Articulo 93
- Minimum-wage workers: overtime within the nine-hour weekly cap is fully exempt from ISR, provided it stays within the limits set by the LFT.
- Workers earning above minimum wage: 50% of authorized overtime pay is exempt, but the exemption cannot exceed five times the general minimum wage per week worked. Anything above that ceiling is taxed as regular income.
Overtime beyond the nine-hour weekly cap, the hours that trigger triple pay, does not qualify for the exemption at all, because those hours fall outside the limits set by labor law. Every peso earned in that range is fully taxable. Employers who push past the cap pay both the triple wage and the payroll complications of losing the favorable tax treatment.
Fines Employers Face for Violations
Penalties under the LFT are calculated using the Unidad de Medida y Actualización (UMA), a daily reference value. For 2026, the daily UMA is $117.31 MXN.
Employers who violate workday rules under Article 61 face fines of 50 to 250 UMA, roughly $5,866 to $29,328 MXN. For violations involving overtime pay or hours embedded in a collective bargaining agreement, Article 1000 escalates the range to 250 to 5,000 UMA, roughly $29,328 to $586,550 MXN.3Justia Mexico. Ley Federal del Trabajo – Articulos 992 al 1010, Responsabilidades y Sanciones Fines are assessed per violation, so a pattern of abuse can compound quickly.
On top of administrative fines, a worker denied proper overtime pay can file a claim for back wages before a labor court. The employer would owe the unpaid overtime differential and, for any hours past the nine-hour weekly cap, the triple-rate premium. Between the fines, the back pay, and the exposure during labor inspections, treating Article 66 as a suggestion rather than a boundary can get expensive.