What to Know Before You Buy or Sell: Form 17 Seller Disclosure Statement. Learn more about the NWMLS Form 17 (or Seller Disclosure Statement).Almost all sellers in WA must complete and provide one to a buyer. Almost every home seller in WA must complete a Seller Disclosure Statement, aka the Form 17. Learn more, and get a copy you can use for free! The Form 17 is governed under Chapter 64.06 of the Revised Code of Washington, and in the case of improved residential real estate, RCW 64.06. All data is state fiscal year (SFY) 2021, unless otherwise noted. Income limits are effective as of March 1, 2022. Net premium payments are employer premiums paid. Those first sheets now form an "issue point" that collectors use to determine how early in the printing process the sheet was printed.