Power of Attorney form for any matter involving the ad valorem taxation of real and personal property. A power of attorney is a document that allows someone else to act as your legal agent.Thus, a power of attorney can be used to allow a friend to sell your car. Individual Personal Property (IPP). A POA to sell a property can be a practical solution in various situations where homeowners cannot handle the sale themselves. QUESTION: A homeowner signed a power of attorney allowing his adult son to act on his behalf in financial matters, including the sale of real property. The IPP Taxscribe Personal Online Listing System allows taxpayers to file extension requests, manage multiple listings, file online, and quickly update data.