Child support cases are generally handled by the family court system in each state. This includes determining the amount of child support that should be awarded and issuing the actual court order. Such payments may include provisions for medical coverage and childcare services. Although support is usually calculated as a set percentage of the non-custodial parent's income, the court has the discretion to adjust this amount based on the circumstances of the case. Either parent can petition the court for a modification of the support order but there must be a compelling reason to change it for a judge to consider this type of request valid. In the event that the non-custodial parent does not pay, the custodial parent can turn to the state's child support enforcement division. This type of agency can take action to collect unpaid amounts. It can also assist in establishing paternity in disputed child support cases. Private collection agencies and attorneys can also be enlisted to assist in recovering unpaid amounts.