Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.Specific factors are determined in calculating spousal support in New York including income of both parties and the duration of marriage. Basic Calculation: DETERMINE WHICH FORMULA APPLIES BY CHECKING THE BOXES BELOW: QUESTION A: Will child support be paid for childrenof the marriage? To calculate alimony or spousal support you will need the following information: Your gross yearly income. Gross income is income before taxes. This page will help you calculate the figures a New York judge would consider in determining how much should be paid in maintenance and child support. This page tells you about how to get an Order for Child Support. To get an order for child support, you must first file a case with the Court. In this video, learn how to calculate maintenance (alimony) in New York.