The Notice of Overpayment will include information on how to appeal. You must appeal the overpayment within 90 days of the date on the notice.You must be able to prove you lived in the county when the now-defunct tax was collected. An overpayment of benefits can occur for a number of reasons. Knowing how they can occur can help you avoid such a circumstance. In August, the Property Appraiser sends each property owner a Notice of Proposed Property Taxes, or TRIM notice. To request a tax refund, file an Application for Refund - Sales and Use Tax (Form DR-26S) or Application for Refund - All Other Taxes (Form DR-26).