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Annual Bonus Proportion 
SAP system uses the following formula to calculate the annual bonus proportion:
(Daily wage * Annual bonus days) * Worked days * LFACT factor
TDIAN constant
The annual bonus days are taken from the settings in the Implementation Guide, in section Payroll Mexico ® Special payments ® Annual bonus ® Establish annual bonus to be paid according to seniority.
The TDIAN constant value establishes the days of the year. To do so, see the Implementation Guide, section Payroll Mexico ® Global Settings ® Payroll organization ® Establish number of days per year.
The LFACT rounding factor can also be displayed and modified using the Implementation Guide, section Payroll Mexico ® Special payments ® Termination ® Constants ® Determine factor exactness for termination
