020) since January 1, 1995. Hey Buddy Buck here!The Form 17 permits a seller to mark answers to the form questions as "Yes", "No", "I don't know", and "NA." By law, most sellers of real property must provide a completed Seller Disclosure Statement (aka Form 17) to any buyer. To be used in transfers of improved residential real property, including residential dwellings up to four units, new construction,. The seller disclosure statement, also known as a seller disclosure form or Form17 is a crucial document that sellers must complete when selling their home. A Legal MustHave: For most property sales in Washington, whipping out this form is as necessary as a front door on a house. In today's video, attorney Darcel Lobo describes the Seller Disclosure Form, what it includes, and how it works. Complete this application to obtain your sales tax Certificate of. Authority, which allows you to collect tax, make taxable sales in New.