THE DECISION
Map where you may have an obligation, then choose the narrowest software and service model that covers your channels, product taxability, registrations, calculation and filings.
Tool IQ view
Avalara, TaxCloud, Sovos, AccurateTax and Avior are current Certified Service Providers under Streamlined Sales Tax. Certification is valuable but does not make one provider universally best or cover every state and workflow. Evaluate your actual states, channels, products, return volumes and need for managed filing.
Options at a glance
| Option | Best fit | Strength | Watch closely |
|---|---|---|---|
| Certified Service Provider | Sellers outsourcing most administration in participating Streamlined states | State-certified calculation plus defined administration services | Eligibility, nonmember states, implementation scope and responsibility before service begins |
| Automated tax platform | Sellers needing APIs, channel integrations and broader state coverage | Scalable calculation and optional return workflows | Each module, state, return and implementation service may affect total cost |
| Marketplace-led compliance | Sellers operating mainly through collecting marketplaces | Marketplace may collect and remit for covered sales | Direct sales, registrations and reporting obligations may remain |
| Manual or adviser-led | Very limited footprint and low transaction complexity | Human judgement and low software overhead | Rate, product, jurisdiction and filing complexity grows quickly |
Software comes after the obligation map
A calculation engine cannot decide the entire compliance position from revenue alone. Start with physical presence, economic activity by state, channels, product and service taxability, exemption certificates and existing registrations. Confirm conclusions with state revenue authorities or a qualified adviser.
Marketplace facilitator rules can shift collection for covered marketplace transactions, but a seller may still have direct-channel obligations, registration questions or reporting duties. Do not buy nationwide filing before documenting the footprint.
What the system must do
The core workflow is monitor, register, calculate, collect, reconcile, file and retain evidence. Some products specialise in calculation while others add registrations, returns, exemption certificates and notices. Compare the system against representative orders rather than a logo list.
- Nexus monitoring that distinguishes marketplace and direct sales.
- Accurate product taxability and sourcing for your catalog.
- Integrations for every checkout, ERP and marketplace used.
- Registration and filing coverage for the states you actually need.
- Reconciliation from collected tax to returns and payments.
- Exemption-certificate workflow, notices, audit trail and data export.
What Streamlined certification means
The Streamlined Sales Tax Governing Board says a Certified Service Provider is an agent certified to perform most sales and use tax functions for sellers in Streamlined states. Its current list includes AccurateTax, Avalara, Avior, Sovos and TaxCloud.
Some qualifying CSP-compensated sellers can receive funded services in participating states. Eligibility is specific, registration is required and the seller remains responsible until the provider begins service. Streamlined certification should therefore be a comparison input, not a blanket guarantee.
Run a proof of concept
Give each finalist the same test file: top products, exemptions, returns, shipping, discounts, marketplace orders and destinations in the states that matter. Compare calculated tax to source records and ask who owns corrections when an integration or mapping fails.
Request a complete annual quote: implementation, connectors, transactions, nexus monitoring, registrations, returns, notices, exemption certificates, support and exit export. Ask how overages and amended returns are charged.
Choose the operating model, not just the engine
A small seller with a few direct obligations may need monitoring plus adviser support. A high-volume multichannel seller may need real-time calculation and managed returns. A seller eligible for CSP-funded services should evaluate certified providers against its non-Streamlined states and integrations as well.
Document who monitors thresholds, approves registrations, checks tax mappings, reconciles liabilities and responds to notices. Automation reduces repetitive work; it does not remove governance.
Primary and official sources
Provider capabilities and rules can change. Follow these links to verify the current position before buying.
Commercial disclosure
No provider paid for inclusion or placement in this guide. Tool IQ may add clearly labelled partner links in future and may earn a referral fee, but commercial relationships will not determine the comparison criteria or conclusion.
Tool IQ provides general educational information, not financial, tax, legal, employment or accounting advice. Check current rules and obtain professional advice where appropriate.