Whether your family is just beginning the process of divorce or you are looking to make changes to your parenting time or child support plan, it’s important to know what to expect. The Arizona child support calculator is a valuable tool that can help you better understand what you might receive (or what your responsibility might be). Further in 2018, changes to the child support calculator included allowing for an increase to the self-support reserve test for the paying parent and rounding payment amounts up or down to the nearest dollar. These and other changes could affect child support payment amounts for some families. How do courts determine Arizona child support?