What is an “extended year” pay supplement and how is it calculated? Teachers work on a 190 day contract. When teacher’s services are required beyond this number of days during a year such teachers are entitled to additional compensation. The amount of the supplement is calculated as follows: 1. 2. 3. Determine the daily rate of pay: a. Ascertain the annual local plus state compensation for a 190 day year b. Divide this amount by 190 Multiply the daily rate by the number of days worked during a year beyond a standard 190 day year The product is the extended year supplement for the year