Mexican Employment Law for Expats: No At-Will, Severance & the LFT (2026)

Mexico has no at-will employment, and this single fact reshapes everything an employer or employee should expect. You cannot simply let someone go; without a narrowly-defined justified cause, dismissal triggers statutory severance of three months plus twenty days per year of service — and the burden of proving cause falls on the employer, who usually cannot. The result is a labour market where separations are negotiated and paid, not decreed, and where employees hold genuinely strong protections that cannot be signed away. Layer on the mandatory bonuses and profit-share, the 2019 union-and-courts overhaul, and the 2021 outsourcing ban, and Mexican employment law is one of the more employee-favourable and distinctive systems in this series. This chapter sets it out for 2026: severance and dismissal, the mandated benefits, working time, and how disputes now run.

Why does ‘no at-will’ change everything?

In many countries an employer can end employment by giving notice or pay in lieu; in the US, at-will employment means either party can usually end it at any time. Mexico is emphatically not one of those countries. Employment is presumed indefinite and protected, and an employer can dismiss without paying severance only for a ‘justified cause’ — and the justified causes are a specific, narrow list in the Federal Labour Law (serious misconduct, dishonesty, violence, repeated unjustified absence, and similar), each requiring the employer to prove the cause with evidence and to follow a strict procedure (including giving the employee written notice of the reason within a short deadline).

If the employer cannot prove justified cause — which is common, because the bar is high and the procedure exacting — the dismissal is unjustified, and the employee is entitled to either reinstatement or constitutional severance. In practice, most separations without clear cause are handled as negotiated terminations with severance paid, because the employer’s downside if it fights and loses (back pay accruing throughout the dispute, plus the full severance) is severe.

For a foreign employer, this is the central adjustment: you budget for separation, you cannot dismiss at will, and ‘performance’ dismissals in particular are difficult and usually paid out. For an employee, it means genuinely strong job security and a strong negotiating position on exit. It is the defining feature of Mexican employment, per our Mexico employer compliance guide.

How is severance calculated?

When employment ends without justified cause (the employer dismisses, or the employee justifiably resigns due to employer breach), the statutory entitlement comprises several components:

The constitutional indemnity of three months’ salary; 20 days’ salary for each year of service (in unjustified-dismissal cases where reinstatement is not ordered); the seniority premium (prima de antigüedad) of 12 days’ salary per year of service (with the daily wage for this capped at twice the minimum wage); plus all accrued and proportional amounts — unpaid salary, proportional aguinaldo, accrued and proportional vacation, and the vacation premium. ‘Salary’ for severance is the integrated daily wage (salario diario integrado), which includes not just base pay but the proportional value of the aguinaldo, bonuses and benefits — so it is higher than the base daily rate, and severance is calculated on this fuller figure.

The arithmetic adds up quickly: a long-tenured employee’s severance can reach many months of pay. And crucially, if a dismissed employee litigates and the employer cannot prove justified cause, back salary (salarios caídos) accrues during the proceedings (capped at 12 months, then converted to interest under the 2012 reform) — giving employees real leverage and employers a strong incentive to settle. Resignation (voluntary, without employer breach) generally entitles the employee only to the seniority premium (after 15 years, or in defined cases) and accrued amounts — far less — which is why the characterisation of a departure as dismissal versus resignation matters enormously, and why employers document resignations carefully and employees are cautious about signing anything on the way out, per our Mexico tax guide.

What benefits and leave are mandatory?

Mexican law mandates a rich set of benefits that cannot be reduced. The aguinaldo (Christmas bonus, at least 15 days’ salary, before 20 December). The prima vacacional (25% premium on vacation pay). Vacation days: transformed by the 2023 Vacaciones Dignas reform from a notoriously stingy 6 days to 12 days in the first year, rising by two days per year to 20, then by two days per five years — a genuine and much-needed improvement. PTU (the 10%-of-profits share). Plus the IMSS benefits (healthcare, disability, pensions) and INFONAVIT housing-fund access, per our Mexico tax guide.

Working time: the standard is a maximum of 48 hours per week (an 8-hour day for the day shift; shorter maximums for night and mixed shifts), with overtime paid at a 100% premium for the first nine hours a week and 200% beyond — a strong overtime regime. A day of rest with full pay per week is required, and there are statutory public holidays with premium pay if worked. There has been sustained discussion of reducing the working week to 40 hours, which may advance — verify the current position.

Maternity leave is 12 weeks (six before, six after birth) at full pay through IMSS, with breastfeeding breaks; paternity leave is a shorter statutory period. Profit-sharing, seniority premiums, and the integrated-wage concept mean the true cost and value of Mexican employment sit well above base salary. The consistent theme is that Mexican employees hold substantial, non-waivable statutory entitlements, and both employers and employees must plan around them rather than around the base-salary figure.

What did the 2019 and 2021 reforms change?

The 2019 labour reform was the most significant in decades. It overhauled the union and collective-bargaining system — requiring genuine, secret-ballot worker approval of collective agreements and union leadership (aimed at the ‘protection contracts’ that had let employer-friendly unions sign agreements workers never saw), and creating independent labour courts to replace the old tripartite Conciliation and Arbitration Boards, alongside a mandatory conciliation stage before litigation. This was driven partly by USMCA labour commitments, and it materially strengthened genuine worker representation.

The 2021 outsourcing (subcontratación) reform was equally consequential: it banned the subcontracting of a company’s core/predominant activities, requiring workers who perform a company’s main business to be directly employed by it. Only specialised services not part of the client’s core business may be outsourced, and only through providers registered in the REPSE registry. This ended the widespread abuse of outsourcing structures (which had been used to suppress PTU, dilute severance and reduce IMSS liabilities), and it is now a critical compliance requirement — using non-compliant outsourcing carries severe penalties and tax consequences.

Together these reforms modernised Mexican labour relations toward genuine representation and direct employment, and they are essential context for any employer: the old workarounds are gone, unions are becoming more genuinely independent, disputes run through new courts with a conciliation gateway, and workforce structures must comply with the outsourcing rules. Foreign employers operating on pre-2021 assumptions are exposed, per our Mexico employer compliance guide.

How are disputes resolved now?

Since the 2019 reform, the dispute process has a new shape. The first, mandatory step is conciliation before the new Federal or local Centres for Conciliation — an attempt to settle before any litigation, which resolves a large share of disputes. If conciliation fails, the matter proceeds to the new labour courts (part of the judiciary), which replaced the old Conciliation and Arbitration Boards and are intended to be more impartial and efficient.

For an employee, the system is accessible and protective: labour proceedings favour the worker in various procedural respects, the employer bears the burden of proof on key issues (including justified cause for dismissal), and legal representation is available including through the Procuraduría de la Defensa del Trabajo (a free public labour-defence service). The strong protections and the back-pay exposure give employees genuine leverage, which is why so many disputes settle at conciliation with severance paid.

Practical guidance for expats: keep your contract, payslips (which show the integrated wage), and records of hours and benefits; do not sign separation documents without understanding them (the resignation-versus-dismissal characterisation is decisive); use the free conciliation and defence services; and be aware of the limitation periods (generally a claim for unjustified dismissal must be brought within two months, though other claims have a one-year period — verify, as the dismissal deadline is short). Mexican labour justice is genuinely oriented toward protecting employees, and a foreign worker who understands their rights is in a strong position — but the short dismissal-claim deadline means acting promptly matters.

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