Use a Florida business purchase agreement to record the sale of a business. Download a Florida business purchase agreement today.We provide due diligence with accurate and timely onsite searches and retrieval of all business, real property, tax, and legal documents. Write your complete sales and use tax certificate number on the check or money order. Do not send cash in the mail or pay with cash at a local service center. If a business entity is designated as the Agent, a principal (individual) of that entity must sign to accept the obligations. The key document of any Florida business purchase is the purchase agreement. If you buy an item tax exempt intending to resell it, and then use the item in your business or for personal use, you owe use tax. Your Florida Annual Resale Certificate for Sales. All vendors participating in State of Florida procurement opportunities will find useful information available from the Office of Supplier Diversity.