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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

Washington rates and boundaries files



Local sales tax rate change notices

Additional tools for determining sales and use tax rates


Contact us about Streamlined Sales Tax



National SST Resources

National Streamlined Sales Tax web site


Forms & Publications

Special Notice (pdf)

Exemption Certificate (pdf)