Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.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. Alimony and child support are both based on income, but there are other factors. Click here to learn more. Use our calculator to get a quick, approximate estimate for child support and maintenance payments in New York. The Law Department assists local and out-of-state custodial parents in establishing an order of support from non-custodial parents. Calculating Debt Payoff. If you have unpaid child support debt, you can figure out how long it will take to pay it off with our Arrears Payoff Calculator. DETERMINE WHICH FORMULA APPLIES BY CHECKING THE BOXES BELOW: QUESTION A: Will child support be paid for childrenof the marriage?