Past-due child support is money a person owes if they fail to make a child support payment on time.
Unless the past-due child support is paid off, the amount owed will be included on your next child support bill. The bill will include the amount past-due plus your regular child support payment.
In Illinois, past-due child support grows at an interest rate of 9% each year. The same is true for past-due maintenance (alimony) and past-due cash medical support. Failure to pay past-due child support can result in enforcement penalties.
It is often very difficult to modify past-due child support. Depending on your situation, there may be certain options you can pursue, including: