The SST Program

Does SST membership simplify registration in those states?

Yes — SST membership means one unified registration covers all 24 member states where you have nexus, instead of applying to each state separately. Your CSP submits it on your behalf.

How do I register for SST through a Certified Service Provider?

SST registration happens through your CSP, not directly with each state. You provide your business information and nexus states; your CSP submits to the SST Governing Board. Here's the process.

How do I switch CSPs in the SST program?

Switching CSPs in the SST program transfers your existing SST registration to your new provider, it doesn't cancel it. The SST registration is yours. Here's how the switch works and what to expect.

Is the SST program free to use?

Yes, for remote sellers using a Certified Service Provider. The states pay the CSP directly. Here's what's included, the one trade-off, and who qualifies.

What is a Certified Service Provider (CSP) and why does it matter?

A Certified Service Provider is a company formally certified by the SST Governing Board to deliver compliance services for the program. Only CSPs can offer free filing in SST states. As of 2026 there are five: TaxCloud, Avalara, Sovos, Avior, and AccurateTax.

What is the difference between SST states and non-SST states for a seller?

In SST states, qualifying remote sellers get registration, calculation, filing, and remittance covered for free through a CSP. In non-SST states, you pay per-filing fees and handle registration separately. Here's how to think about both.

What is the Streamlined Sales Tax (SST) program?

The SST program is a 24-state cooperative that lets remote sellers handle compliance in member states for free through a Certified Service Provider. Here's exactly how it works.

Which states are SST member states?

Twenty-four states are SST member states as of 2026. Sellers with nexus in these states can get registration, calculation, filing, and remittance covered for free through a Certified Service Provider.

Who holds audit liability in SST states — me or my CSP?

The SST program provides 'seller protection' when a CSP makes an error on a properly enrolled seller's return. Your exposure is significantly limited when your CSP causes the mistake. Here's what the protection covers and what it doesn't.

Why does SST require monthly filing even if my sales volume is low?

SST requires monthly filing for all enrolled sellers as part of the program's terms. The filing burden lands on your CSP, not you, but here's what to know before enrolling.

Why won't Avalara and TaxJar tell me about SST benefits?

Because it's not in their financial interest. Avalara and TaxJar charge for SST states: a CSP doesn't. Here's how to calculate what you're likely overpaying.