The support belongs to the child, but is paid to the parent. It is paid until the child turns 18. For a child that is still in high school or equivalent, the support may be extended until the child turns 21, and after 18 it is given to the child directly. For international cases, see Försäkringskassan's website and "Convention on the Recovery Abroad of Maintenance" in Swedish law, and relevant EU treaty (in Swedish). In the UK, the Child Maintenance Agency calculates the requisite contribution. In United States, child support is the ongoing obligation for a periodic payment made directly or indirectly by an ("obligor" or paying parent) to an ("obligee" or receiving party) for the financial care and support of children of a relationship or marriage that has been terminated, or in some cases never existed. Often, but not always, the obligor is a non-custodial parent. Often, but not always, the obligee is a custodial parent, caregiver or guardian, or the government. In the U.S., there is no gender requirement to child support, for example, a father may pay a mother or a mother may pay a father. Depending on the jurisdiction, a non-custodial parent may pay child support to a custodial parent, or a custodial parent may pay child support to a non-custodial parent. In addition, where there is joint custody, both parents are "custodial parents" and neither parent is a non-custodial parents, or in other words the child has two custodial parents. Thus, with joint custody, one custodial parent (as an obligor) may be required to pay the other custodial parent (as an obligee). Child support enforcement in the United States at the Federal level is the responsibility of the Administration for Children and Families in the Department of Health and Human Services. There is an overarching framework of federal legislation (title IV-D of the Social Security Act) and regulation within which the states must operate if they wish to receive federal funding. States may also receive additional financial "incentive" payments for establishing paternity, or establishing or modifying child support orders. Although the federal child support program in the United States traces its origins to a congressional concern for recouping from absent parents some of the cash assistance paid to custodial parents, total U.S. child support collections in Federal fiscal year 2006 totaled $23.9 billion, $11 billion of which was paid to families who have never been recipients of public assistance.