The Maryland Petition/Motion to Modify Child Support is a legal document used to petition the court to change the amount of child support that is being paid. This document is filed by a parent who is either paying or receiving child support, and is seeking to modify the amount of the support. The two types of Maryland Petition/Motion to Modify Child Support are: 1. Petition/Motion to Modify Child Support for Current Support: This type of motion is used when there has been a change in the paying parent’s income since the initial court order was issued. This type of petition/motion can be used to increase or decrease the amount of current child support being paid. 2. Petition/Motion to Modify Child Support for Retroactive Support: This type of motion is used when the paying parent failed to pay the amount of child support that was due before the motion was filed. This type of petition/motion can be used to request an amount of back child support that is owed due to the nonpayment of the original court-ordered amount.