Me and my ex have 2 children. One lives with me, and one lives with her. The one that lives with me will be aging out of child support this spring when he graduates from high school. I re-ran the child support calculator and just entered that we had one child (instead of 2) and the per month amount I am supposed to be paying her went up quite a bit, almost double. Is that right? Our sep agreement just states that the amount to be paid will be according to the NC child support guidelines. How should we be doing this calculation?