Rationale for Award: Provide a brief explanation of why the bonus is being awarded. This fact sheet provides general information regarding bonuses and the regular rate of pay under the FLSA for non-exempt employees.Find out the best time to ask for a bonus and why you should write a bonus request letter. If earned, the Bonus will be paid to you in a lump sum (less applicable tax withholdings) within 30 days following the date of such termination of employment. There are numerous reasons why a company would want to use a retention bonus letter. The reason is simple. Customer: Employment Law. I was given an employment letter in February 2007 to run a company. A common example of an incentive is the signon bonus given when a new employee accepts an employment offer. To inform employees about their bonus, you can send a bonus letter.