Estate tax forms

Warning: To protect against the possibility of others accessing your confidential information, do not complete these forms on a public workstation.

Extension of time to file a WA State Estate and Transfer Tax Return

Paper application

• Application for Extension of Time to File a Washington State Estate and Transfer Tax Return (Fill-In or Print)​
  • An executor or a preparer may request an extension for filing the estate tax return by completing the form above. If applicable, include an estimated tax payment.

Note: Use this form to request a second extension (up to an additional six months).​

Electronic application (First time extension request with payment)

• Electronically file (First Estate Tax Extension Request with payment)
  • ​An executor with an estate bank account may file an electronic extension request for the first automatic extension (six months). 
  • Prior to filing an electronic request, have the following available for reference:
    • Information requested on the extension form.
    • Estate’s bank account information.
    • Estimated estate tax payment.

WA State Estate & Transfer Tax Return, instructions, checklist, and addendums

Return, filing instructions, and checklist

• Washington State Estate and Transfer Tax Return (Fill-In or Print)
•  Washington State Estate and Transfer Tax Return (Excel Version with Auto-fill)
• Filing instructions
• Filing checklist

Addendums

• Addendum # 1 - Qualified Terminable Interest Property (QTIP) or Qualified Domestic Trust (QDOT) with instructions (Fill-In or Print)
• Addendum # 2 - Property Used for Farming (farm deduction) with instructions (Fill-In or Print)
• Addendum # 3 - Qualified Family-Owned Business Interests (QFOBI) with instructions (Fill-In or Print)
• Addendum # 4 - Apportionment for Out of State Property with instructions (Fill-In or Print)

​Additional documents

Related forms

• Affidavit Substantiating Decedent's State of Domicile at Death
• Confidential Tax Information Authorization (Estate Tax Information Only) (Fill-In or Print)
• Escheat Property, Notice of (Fill-In or Print)