The Tax Office holds unclaimed property tax overpayments made within the last three years and outstanding (uncashed) refund checks. Highlighted in yellow on their website, the agency notes that overpayments cannot be forgiven and there is "no exception" for hardship.Please call 1-800-772-1772 or your local field office and we may be able to process your waiver request quickly over the phone. Child Support Attorney Houston - What if I overpay my child support obligations?