Article 154 Federal Labor Law
TITLE FOUR. Rights and Obligations of Employees and Employers · CHAPTER IV. Rights of preference, seniority and promotion
Current text · last reform published in the Official Gazette of the Federation (DOF) on 14 May 2026
Employers shall be obligated to prefer, in equality of circumstances, Mexican employees with respect to those who are not, those who have served them satisfactorily for a longer time, those who, not having any other source of economic income, have a family in their charge, those who have finished their obligatory basic education, those who are trained with respect to those who are not, those who have greater aptitude and knowledge to perform a job and those who are unionized with respect to those who are not.
If a collective employment contract exists and it contains an admission clause, the preference to occupy the vacancies or newly created positions shall be governed by what the collective employment contract and the union statute provide.
Unionized is understood as every employee who is a member of any legally constituted labor union organization.