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. This Child Support Standards Chart can be used to determine an approximate annual child support obligation. See how parenting time affects the total. Calculation of Support Payments. Nassau County calculates child support payments based on New York state guidelines. You would simply add up the amount of Social Security taxes and Medicare taxes you paid and then deduct that amount from your gross income. Select a link below for answers to your questions about Child Support in Nassau County and Suffolk County, Long Island, New York. Note the total amount to withhold; Calculate the amount you can withhold; Remit the payment as directed.