The following providers are certified by the Streamlined Sales Tax Governing Board.
The following CSP's systems are certified by the Streamlined States, but they are not currently offering free services under Streamlined's CSP program.
The Technology Models are:
A “Model One” seller is a “CSP-compensated seller” that has contracted with a Certified Service Provider (CSP) to perform all the seller's sales and use tax functions, other than the seller's obligation to remit tax on its own purchases.
A “Model Two” seller is a seller that has contracted with a provider to use their CAS. A CAS is designed for a business that wants to use the tax calculation software that has been certified by the states while keeping the responsibility for filing returns and remitting the tax.
A “Model Three” seller has a proprietary system that calculates tax due for each jurisdiction that meets the performance standards set by the states. A seller must have a certain level of sales and a proprietary system that calculates tax due for each jurisdiction.
A “Model Four” seller does not use a CSP or a CAS.