The court ordered me to pay child support beginning last month. I am current on my payments. I just received a "Notice to Withhold Income for Support" which includes 12% interest for the retroactive support just ordered. Can I file an objection with the court for this garnishiment? If not, can I pay off the retro in a lump sum? And, if I do the payoff, will I have to file a motion for another modification? Thanks!