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I have reviewed your issue and Arizona law. I wish I had better news for you. Unfortunately, In Arizona the court cannot modify child support retroactively. A.R.S. Section 25-327.A. clearly establishes that child support modifications “are effective on the first day of the month following notice of the petition [for modification] . . . .” “Notice” of the petition to modify is usually the date the petition is served on the other parent. If there are overpayments remaining when the child turns 18, you can apply to get that amount back. This code section explains how that process works. The main thing in these situations is to remain vigilant in checking the paperwork, reporting any changes to the court quickly and filing for modifications as soon as possible if there is a substantial change in circumstances where another child comes into the picture, loss of income, etc.
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