If you believe you have overpaid your property taxes (for real property and tangible personal property), you may be eligible for a refund. In this article, we will discuss what to include in your demand letter to a contractor, what to avoid, and provide a sample demand letter.The IRS uses Letter 3286C to inform you that they believe you may have overpaid for a particular year and will refund you the difference. • Search results for the Process Refund Request screen will provide all items with the exception of items in Pending or Complete status. Below is a list of forms that you may download for free from our website.