Article 89 Federal Labor Law

To determine the amount of the compensation (indemnity) that must be paid to the employees, the wage corresponding to the day on which the right to the compensation (indemnity) arises shall be taken as the basis, including in it the daily quota and the proportional part of the benefits mentioned in article 84.

In the cases of wage by unit of work, and in general, when the remuneration is variable, the average of the earnings obtained in the thirty days effectively worked before the arising of the right shall be taken as the daily wage. If in that period there has been an increase in the wage, the average of the earnings obtained by the employee as of the date of the increase shall be taken as the basis.

When the wage is fixed by week or by month, it shall be divided by seven or by thirty, as the case may be, to determine the daily wage.