i pay my child support on time. i also get it taken from my pay checks. can they take more than i owe a month?

If a Title IV-D Child Support Office is involved in your case there is a statute that allows for them to take an additional amount per week depending on the amount of money you may owe for back support.  The statute is I.C. 31-16-15-2.5 that spells out the additional amounts the Title IV-D office can take.