(1) A taxpayer may request the department to adjust a joint tax return that was filed in the circumstance where the refund is being offset by the department for a child support arrearage.

(2) The adjustment will reflect the dollar amount of the refund that is attributable to the "obligated spouse," and the part of the refund that is attributable to the "injured spouse." The amount attributable to the injured spouse will be deemed exempt from offset.

(3) This request must be made in writing, and must be made within 30 days after the Notice of Offset and Opportunity for Hearing is mailed to the taxpayer.