The term “CSP,” short for Certified Service Provider, is a concept created by the Streamlined Sales Tax Governing board and refers to a tax compliance technology provider certified to ensure compliance with necessary sales and use tax regulations. While the Streamlined Sales Tax (SST) certification is open to all tax technology providers, only a small handful have opted to participate in this rigorous process which requires a comprehensive review of both technology and tax content.
Source: SOVOS
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