Maternity and paternity leave in Mexico: What EOR employers must know

Article 170, Fraction II requires 12 weeks (84 calendar days) of paid leave: 6 weeks before the expected delivery date (descanso prenatal) and 6 weeks after (descanso postnatal). On the employee’s express written request, with authorisation from the IMSS treating physician and subject to the employer’s consent, up to 4 of the 6 prenatal weeks may be deferred to the postnatal period. An employee can therefore take as little as 2 weeks before birth and as much as 10 weeks after.

If the child is born with a disability or requires hospitalisation, the postnatal period extends to up to 8 weeks under Article 170, Fraction II. Fraction III provides a separate, broader extension for as long as necessary where the employee is incapacitated by pregnancy or childbirth complications, and Fraction VI caps the complication-based extension at 60 additional days paid at 50% of salary. If actual delivery occurs later than expected, the prenatal period extends correspondingly and the postnatal period remains intact from actual birth.

The pay rate during the 12 weeks is 100% of the employee’s salario base de cotización (SBC), the integrated daily wage used for social security calculations. The SBC is capped at 25 times the daily UMA value. With the daily UMA at MXN 117.31 effective 1 February 2026, the maximum daily IMSS maternity payment is MXN 2,932.75. Across the 84-day leave, that totals approximately MXN 246,351.

IMSS pays the subsidy directly to the employee. The employer does not run salary through payroll during the leave period, provided the employee meets the IMSS contribution test. The employer does, however, continue to pay the employer-side IMSS contributions (cuotas patronales) throughout the leave under Article 170, Fraction VII, and the employee’s seniority continues to accrue for vacation, aguinaldo, and prima vacacional purposes.

Article 102 of the LSS conditions the cash maternity subsidy on the employee having at least 30 weekly contributions registered in the 12 months before leave starts. This is a strict gate. If the employee meets it, IMSS pays. If she does not, Article 170, Fraction V LFT obliges the employer to pay 100% of the integrated salary directly for the full 12 weeks. There is no offset against employer IMSS contributions.

The most common reason for missing the 30-week threshold is late or incorrect employer registration with IMSS. An EOR that registers the employee at the wrong SBC, or registers her late, can move a routine maternity claim into a direct seven-figure-peso liability. This sits among the most material EOR exposures in Mexico.

Article 170, Fraction VII guarantees the right to return to the same job, position, and seniority within one year of birth. Article 47 LFT governs justified dismissal causes; pregnancy and parental leave are not among them. The Supreme Court (SCJN) established in Contradicción de Tesis 318/2018 that the employer carries the burden of proving a dismissal was unrelated to pregnancy. Even a signed resignation may be challenged as non-spontaneous given the employee’s state of vulnerability.

Article 170, Fraction IV grants breastfeeding rights for up to 6 months after the return from maternity leave: either two paid 30-minute breaks per day in a hygienic space (lactario), or a single one-hour daily reduction in working hours, at the employee’s election. As of August 2025 a pending bill proposes extending each break to 1 hour and mandating specifications for lactario facilities, but the current entitlement remains the 30-minute structure.

Article 166 LFT prohibits employers from assigning pregnant workers to tasks requiring heavy physical effort, vibration, prolonged standing, or work that may affect psychological state. Where such work cannot be avoided the employer must reassign the employee with no salary or seniority reduction. NOM-035-STPS-2018, fully effective from October 2020, adds a psychosocial risk identification and prevention obligation that applies particularly to pregnant employees and those returning from leave.

The 20-day extension is the most commonly misunderstood point in Mexican parental leave law. The legislative timeline:

• 12 December 2023: the Cámara de Diputados approved the draft decree to amend Articles 132 LFT and 28 LFTSE with 409 votes in favour, increasing paternity leave from 5 to 20 working days, extendable to 30 in cases of medical complications.
• March 2024: Senate labour and legislative studies committees ratified the bill.
• The Executive subsequently asked Congress to defer discussion until the new legislature beginning September 2024, citing the electoral process.
• February 2025: a separate Senate initiative to extend leave from 5 to 10 working days was introduced and remains in committee.
• October 2025: the Mexico City Congress approved a proposal to extend federal paternity leave to 45 calendar days, submitted to the federal Senate.
• December 2025: the SCJN issued a ruling equating paternity leave with maternity leave (approximately 3 months) in the context of a Baja California Sur state law challenge; this applies to the state law at issue and creates jurisprudential pressure for federal reform.

As of May 2026 the 20-day bill has not been published in the Diario Oficial de la Federación and has not entered into force. The statutory paternity leave entitlement remains 5 working days. Communicating any longer figure to employees as their current legal entitlement is incorrect.

Article 132 does not restrict paternity leave to heterosexual relationships. Following SCJN amparo rulings on same-sex marriage, same-sex co-parents are entitled to paternity leave for the non-birthing parent. Adoption is explicitly covered in the same fraction.

In practice, multinational subsidiaries (financial services, technology, consulting) frequently offer 2 to 4 weeks of paternity leave on top of the 5-day floor as a talent attraction tool. Several US-headquartered companies apply their global “primary/secondary caregiver” frameworks in Mexico, which typically results in significantly longer paternity entitlements than the statutory minimum.

The 2019 reform added Article 140 Bis to the LSS, creating an IMSS-funded leave for parents whose children are diagnosed with cancer. The provision is rarely flagged in foreign HR onboarding and is among the more substantive special leaves in Mexican law.

Coverage is for IMSS-insured working mothers or fathers whose children up to 16 years of age have been diagnosed by IMSS with cancer. Each IMSS certificate is valid for 1 to 28 days, and the total cumulative leave may not exceed 364 days across a maximum 3-year period. Pay is 60% of the last registered SBC, paid by IMSS as a subsidy. Eligibility requires either 30 weekly contributions in the prior 12 months or 52 consecutive weekly contributions before the leave starts. Article 37 Bis of the LISSTE mirrors this provision for federal public-sector employees.

Beyond the cancer-specific provision, there is no general statutory sick child leave in the LFT for parents of seriously ill children. Some employers handle this through sick-leave policies, vacation allocation, or collective agreement provisions. A pending August 2025 bill proposes a monthly 2-hour paid leave for guardians of persons with disabilities for medical appointments, currently in committee.

Article 170, Fraction V LFT shifts the payment obligation to the employer in two situations:

• The employee does not satisfy the 30-week IMSS contribution requirement.
• The employer failed to register the employee with IMSS within the statutory 5-working-day deadline or registered the employee at an incorrect SBC.

In both cases, IMSS may deny the subsidy entirely, leaving the employer responsible for paying 100% of the salary during the full 12-week maternity leave period.

For tax purposes, IMSS maternity subsidies are generally tax-exempt up to nine times the daily UMA × 365 annually, which covers most employees in practice. Employer IMSS contributions remain deductible for corporate income tax purposes. The distinction matters operationally because EOR cost models that assume IMSS will always absorb maternity costs can materially underprice risk for newly hired, recently re-registered, or incorrectly registered employees.

Employers must register employees with IMSS within 5 working days of the employment start date and report the correct SBC. If registration is late, incomplete, or inaccurate, IMSS may refuse the maternity subsidy entirely.

In that situation, Article 170, Fraction V LFT shifts the full 12-week salary obligation to the employer. Maximum exposure can exceed MXN 246,351 per employee based on the 2026 IMSS subsidy cap, and may be materially higher where the employee’s actual integrated salary exceeds the capped IMSS amount.

Mexico’s April 2021 outsourcing reform prohibited personnel outsourcing except for genuine specialised services unrelated to the client’s core economic activity. Providers offering specialised services must maintain REPSE registration with the STPS, renewed every 3 years.

Legitimate EOR structures remain permissible in Mexico, and compliant providers maintain active REPSE registration. The risk emerges when an EOR operates without REPSE registration or structures the arrangement in a way that resembles prohibited personnel outsourcing. In those cases, both the provider and the client company can face STPS sanctions and labour exposure. REPSE verification is now a standard part of EOR due diligence in Mexico.

Under SCJN Contradicción de Tesis 318/2018, employers bear the burden of proving that a dismissal was unrelated to pregnancy. Performance concerns, probationary dismissals, and restructuring decisions require contemporaneous documentation capable of meeting Mexican labour tribunal standards.

Potential exposure under Articles 49 to 50 LFT includes reinstatement or severance equal to 3 months’ salary plus 20 days per year of service, with additional liability where discrimination is established. Claims now proceed through the post-2019 labour justice system, which replaced the former Juntas de Conciliación y Arbitraje with judicial labour tribunals and mandatory pre-trial conciliation procedures.

Article 994 LFT sets fines for non-compliance at 50 to 1,500 UMA per violation, equivalent to roughly MXN 5,866 to MXN 175,965 at 2026 UMA values. Pregnancy-related dismissal exposure can run separately from these administrative fines.

Pregnancy and parental protections apply from the first day of employment, including during probationary periods. Employers dismissing a pregnant employee for alleged performance issues during probation carry the burden of proving the dismissal was unrelated to pregnancy under SCJN precedent.