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This page provides information for businesses and Certified Service Providers that are registered for the national Streamlined Sales Tax project.


Information about Streamlined Sales & Use Tax

Petition for membership

Join the national Streamlined Sales and Use Tax project

Confidentiality of Consumer Information

Certificate of Compliance

Washington's taxability matrix


Sales & use tax information


Contact us about Streamlined Sales Tax



National SST Resources

National Streamlined Sales Tax web site


Forms & Publications

Special Notice (pdf)

Exemption Certificate (pdf)