Update on the capital gains excise tax

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Washington State Department of Revenue

  January 11, 2023

Capital gains litigation

In March of 2022, the Douglas County Superior Court ruled in Quinn v. State of Washington that the capital gains excise tax (ESSB 5096) does not meet state constitutional requirements and, therefore, is unconstitutional and invalid. The State has appealed the ruling to the Washington Supreme Court.

While the appeal is pending, the agency was granted a stay of the Douglas County ruling. The stay does not resolve the issues surrounding the constitutionality of the capital gains tax, but it does preserve the agency’s ability to effectively administer and implement the tax and meet statutory obligations, including accepting tax payments, pending a final decision from the Washington Supreme Court. As a result, the online system will be made available to taxpayers to report and pay the tax. The system is targeted to go live in February 2023. If the Court eventually finds the statute to be unconstitutional, any tax payments received will be promptly refunded with interest. 

The Department will continue to provide guidance to the public regarding the tax as a courtesy. Any guidance provided herein will apply only if the tax is ruled constitutional and valid, in its entirety, by a court of final jurisdiction.

Capital gains return overview available

We have developed an overview of the capital gains tax return for individuals and tax preparers to view. This overview is for informational purposes only and the information provided in the examples are not actual figures.

capital gains excise tax return overview

This guide will take you through the capital gains tax return.


Capital gains excise tax rule adopted

This new rule clarifies administrative aspects of the excise tax on capital gains, Chapter 82.87 RCW, such as proper filing and payment procedures and potential penalties for not following filing and payment requirements.

With the stay of the superior court decision granted by the Washington Supreme Court, Chapter 82.87 RCW is in effect and this rule (WAC 458-20-300) will become effective January 28, 2023, unless determined otherwise by the Washington Supreme Court.


Learn more about the capital gains excise tax on our website.