Use this worksheet when one parent (or a third party) has primary physical custody of all of the children for whom support is being determined. The Guidelines have a complete list.If both parents are W-2 employees, this step should be straightforward. How is alimony calculated in North Carolina? Use our child support calculator to provide an estimate of the child support payments the court may order you to pay in NC.. Call us today at . In Wake County, North Carolina, you can estimate child support with the child support calculator. This calculator determines the value of child support to be paid based on income, days the children spend in your custody, and other child-related expenses. Calculation of past, unpaid periodic alimony and child support. Durational alimony is the long-term financial support one spouse pays the other. Can you afford spousal support?