You should apply in writing as soon as you receive your canceled check, money order or cashier's check. There has been an error in your favor!If you have an overpayment, we'll send you a decision letter. It will say how much you owe. The salary overpayment resulted because . NOTICE OF FOOD STAMP OVERPAYMENT (DEMAND LETTER) (Timely and Adequate). NOTICE. If you need a copy of your tax return, you must send your request in writing to: Taxpayer Assistance Section, Kentucky. Department of Revenue, P.O. Box 181,. First, you need to issue a check to your customer using the Accounts Receivable account for the overpayment amount.