[header] How to lower child support in florida [title] Research florida child support law. [step] Before you request the court modify your existing child support, make sure you have a good understanding of the state's child support guidelines and how they apply to your situation. [substeps] Florida law allows child support to be modified any time there is a substantial change in circumstances. 
A change is substantial if it changes support by at least 15 percent or $50. There is no absolute amount that your income must change, but the change in income must lower your child support payments by at least 15 percent or $50, whichever is greater.