Your business must register with ADOR before conducting any taxable business activity in Arizona for transaction privilege tax (TPT) and withholding purposes. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer.Business brokers are a good place to find an Arizona business. They often have good qualifications. We invite all businesses to participate in the State of Arizona's purchasing program. Arizona Transaction Privilege Tax (TPT) is a tax imposed on vendors for the privilege of doing business in the State of Arizona. This will allow you to file and pay taxes online. You may download a copy of the business account update (BAU). Arizona Transaction Privilege Tax (TPT) is a tax imposed on vendors for the privilege of doing business in the State of Arizona. Your purchase price will be dealt with in the Business Assets section.