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

Sales & use tax information

• Washington rates and boundaries files
  • Rates
    • Quarter 3 (effective July 1 - Sept 30)
    • Quarter 2 (effective April 1 - June 30, 2008)
  • Boundaries
    • Quarter 3 (effective July 1 - Sept 30)
    • Quarter 2 (effective April 1 - June 30, 2008)
• Local sales tax rate change notices
• Washington's taxability matrix
• Additional tools for determining sales and use tax rates

Contact us about Streamlined Sales Tax

National SST Resources

Registration System

Frequently asked questions

National Streamlined Sales Tax web site

Certified Service Providers

Forms & Publications

Special Notice (pdf)

Exemption Certificate (pdf)