In Indiana, the child support age has now dropped to 19. When a non-custodial parent has arrearages, how much do they have to pay on arrears?

Indiana has a statute that allows for a child support office (Title IV-D) to add an additional amount on any income withholding sent out from their office if there is an arrearage owed.  The amount they can withhold will depend on the amount of arrearage owed.  Also, the Court will likely order an arrearage amount to be paid as well.  So the amount will very depending on whether or not the Court orders an amount to be withheld and the child support office involvement in your case.