Certified Educator Salary Schedules include teachers, certified instructional support and school based administrators. This bonus has 2 criteria and is determined based on EVAAS growth scores. 1.The Board of Education has approved a bonus incentive plan that is designed to entice teachers to come work in Gaston County Schools. NC Teacher Salary Schedules. Certified Salary Schedules include teachers, certified instructional support and school-based administrators. This North Carolina bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses.