The Child Support Standards Act (CSSA) is the name given to a set of laws that contain a formula for calculating child support. The laws can be found in section 240 of the Domestic Relations Law and section 413 of the Family Court Act.
The CSSA establishes child support amounts that allow children to have an appropriate standard of living, based on the income of their parents. Both parents’ incomes are considered in the formula even if they have joint custody, because both parents have the duty to support their children. It applies equally to children whose parents have been married and to those whose parents have not married, and to children up to the age of 21 unless they are emancipated sooner.