First thing you need to do is read the Arizona Child Support Guidelines , custodial parents with the larger income CAN be ordered to pay the other party .

http://64.233.167.104/search?q=cache:uJ1jVukk4hQJ:www.superiorcourt.maricopa.gov/sscDocs/pdf/drs10h.pdf+arizona+child+support+guidelines&hl=en&ct=clnk&cd=4&gl=us&ie=UTF-8