Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.This article and video explain spousal maintenance (alimony) in Washington State. They also explain undifferentiated family support. New York uses a formula as a guideline for setting alimony payments, but courts can exercise considerable discretion in ordering alimony. Understanding and Calculating Alimony in Washington. Spousal support, spousal maintenance, or alimony—how much will you owe your ex after your Washington State divorce, or how much will they owe you? Specific factors are determined in calculating spousal support in New York including income of both parties and the duration of marriage. Answer the questions in the SEBB Spousal Plan Calculator (interactive tool) or (pdf) to determine if you must pay the surcharge. The following calculator provides an estimate of a potential alimony award in the State of Washington.