FML applications should be submitted at least 30 days in advance of the need for leave. Fill out the Leave Request Form as soon as reasonably possible (preferably 30 days in advance of your planned leave). 2.To request leave under FMLA there are certain documents required. 6.1 Eligible employees shall inform their supervisor or FMLA coordinator of the need to take. Requesting FMLA Leave. I have read the employee FML responsibilities. Requesting FML requires the employee to submit a Request for Family Medical Leave form. How Do I Request FMLA Leave? This includes employers which hire more than 50 employees seasonally for less than twenty weeks out of the year. PBS Payroll Department.