My wife’s Ex lost his job and went to drug rehab for 3 months back in 2007. He didn’t pay her child support during that time, but when he got out she verbally agreed to allow him to pay 400 a month instead of the court ordered 641.

Now, he is taking her to court to get the child support recalculated, which is fine. However, he is refusing to pay the back child support.

My question is since she agreed to let him pay 400 a month until he got back on his feet, will a court award her the back child support of the difference between the 400 and 641?