Discount SeriesA discount series is a type of discount in which several discounts are given to a purchaser at different times and dependent on the occurrence of different conditions. For example, a discount series might be stated as 20/10/5, where 20 percent of the discount is given at the time of sale, 10 percent is given if a certain volume is reached, and 5 percent is given if payment is made within a specified period of time. The discount series is set up to provide an incentive to customers to engage in specific actions, such as purchasing a specific volume or paying their balance on time