Also known as the civil year, the calendar year refers to a one-year period, beginning on Jan. 1 and ending on Dec. 31. Calendar Quarter means the respective periods of three (3) consecutive calendar months ending on March 31, June 30, September 30 and December 31. A calendar-year basis means you send out and collect renewals from members once a year. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. After paying the deductible once per year, you dont need to pay it again for the rest of the year. Popular periods include the To - Date family of Month to Date (MTD), Quarter to Date (QTD) and Year to Date (YTD). For example, Lucias FMLA leave begins on November 6, 2012 so her 12-month period is November 6, 2012 through November 5, 2013. The first two methods are materially the same in that they set a fixed point in time by which to start calculating FMLA leave.