May 01, 2017 14:54 Updated Follow Please fill out this form and submit it to INPRS. Our address and fax number are on the form. Related articles If I participate in the DROP, retire on my chosen DROP retirement date, and choose the DROP benefit, how will the DROP benefit and my monthly retirement benefit be calculated? How do I begin participating in the DROP? If I wish to retire on my DROP retirement date, how do I file for benefits? Even if I participate in the DROP, may I still choose the retirement benefit I would have received if I had never participated in the DROP while I was working? Is the DROP a separate retirement plan?