UIFSA is the uniform law that Arizona and all other states use to address interstate and certain international child support and spousal support issues. It provides the framework for establishing support orders when the parents live in different states, for enforcing support orders across state lines, and for modifying existing interstate support orders.

UIFSA establishes the rules for which state has jurisdiction to issue an initial support order when parents live in different states, which state has continuing exclusive jurisdiction to modify an existing order, and how states cooperate to enforce support obligations.

UIFSA also extends to some international support cases. Whether a specific international support situation falls under UIFSA depends on which countries are involved and the applicable international agreements.