Monthly Child Support Calculator. This calculator provides an estimate for a single source of income.In most cases, the state will take 20 percent of the noncustodial parent's salary for one child, and the percentage goes up as the number of children goes up. The Child Support Division in the Office of the Attorney. General assists parents in obtaining the financial support necessary for children to grow up and. Child Support Services (CSS) are available to anyone who needs help collecting child support through a network of state and locally run offices. How do I apply for Child Support Services? You can complete the application at your local CSS office or apply online. What are the lowincome child support guidelines? Operation Christmas Child, a project of Samaritan's Purse, has delivered millions of gift-filled shoeboxes to boys and girls around the world.