Increasing Opportunity for Former Foster Youth Act This bill establishes and funds grants to provide services to youth aging out of the foster care system. Such grants must be awarded based on specified degrees of evidence-based effectiveness. Grant applications must specify the target population for the grant, such as foster youth who (1) are at risk of homelessness; (2) have, or are expecting, a child; (3) lack financial stability; or (4) have been involved with the juvenile justice system. The bill also modifies child welfare programs to facilitate the enforcement of child support orders.