Parents must financially support their child until the child turns 21 years old or is emancipated. You won't find a form to fill out.Alimony and child support are very different. Learn what child support covers, how it is determined and the differences in tax implications. The amount of child support that either parent may have to pay following a divorce is based on several factors, and one of those factors is alimony. It is a statement of your financial expenses on the date of separation and your current financial expenses, and it is set out every month. The Child Support Calculator follows the Guidelines and is an easy way to avoid doing the math yourself. The parties agree, in principle, that husband will pay child support. The Financial Affidavit is a very important document. For a modification to occur, one of the parties must file a motion in the court that initially issued the order to pay maintenance.