Whenever child support is an issue in a Florida divorce, both parties are required to complete financial affidavits that detail their income and expenses. Need to Make an Alimony or Child Support Payment?If you do not make a choice, we will send you the smiONE card. The income used to calculate payment of child support is the level of income remaining after alimony is taken out. So alimony payments do reduce child support. Learn how Florida's child support guidelines work, including how to calculate support, when child support ends, and how to change the amount of support. 742.18(7)(c), Florida Statutes. Divorces, child support cases, and modifications of alimony or child support, each party will be required to complete a Family Law Financial Affidavit. FAQs (Frequently Asked Questions) Until What Age Is a Parent Obligated to Support a Child? Who May File a Petition for Child Support?