Washington Self-Proving Affidavit Form

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Updated June 01, 2022

A Washington self-proving affidavit form is a sworn statement that may be attached to a last will and testament in order to make it a self-proving will. The purpose of the affidavit is to provide the sworn testimony of any or all witnesses who signed the testator’s will. This certificate will be admissible in court if their testimony is required. By making their will self-proving, the testator shortens the probate process and adds further validation to their final instructions. State law doesn’t require all of the witnesses to sign the affidavit, however, any witnesses who do not sign a self-proving affidavit will have to present themselves in court if they are called to give their testimony.


  • Statute§ 11.20.020
  • Signing Requirements – Two (2) or more witnesses and a notary public.

How to Write

Step 1 – Download in Adobe PDFMS Word (.docx) or OpenDocument.

Step 2 – The Affidavit should be filled out by entering the names of the Testator and Witnesses who are subscribing to the Affidavit, as well as the title of the Will.

Step 3 – Each subscribing individual must supply their Signature and the Date in the appropriate field in the presence of a Notary Public.

Step 4 – After witnessing the above signatures, the Notary Public will have to enter the Date and the Name(s) of the Subscribing Individual(s) in the Notary Acknowledgment section of the Affidavit. Next, the Notary will validate the document by providing their Notary Public Signature and Printed Name, Commission Expiration Date, and Official Notary Stamp or Seal.