Connie,
Section 825.220(c) of the FMLA states:
"(c) An employer is prohibited from discriminating against employees or prospective employees who have used FMLA leave. For example, if an employee on leave without pay would otherwise be entitled to full benefits (other than health benefits), the same benefits would be required to be provided to an employee on unpaid FMLA leave. By the same token, employers cannot use the taking of FMLA leave as a negative factor in employment actions, such as hiring, promotions or disciplinary actions; nor can FMLA leave be counted under ``no fault'' attendance policies."
Therefore, the employee's time on FMLA cannot be used as a reason to reduce the benefit paid to others as it relates to this particular incentive program.