Sigma Files provides sales tax registration and filing services across all 50 US states. It reviews economic or physical nexus, prepares permit applications, and submits them where registration is needed. After registration, it prepares and files returns monthly, quarterly, or annually. The service says its AI checks returns against current state rules, rates, thresholds, and forms using a database updated daily, while identifying deductions and exemptions. Returns go directly to the state by their due dates, with confirmations and submission records stored in a secured dashboard. Plans include status, documents, messages, filing history, and confirmations. Coverage is available for one, up to three, or up to seven states, with custom coverage priced per state. Essential costs 24.90 USD per month for one state; Growth costs 64.90 USD per month for up to three; Professional costs 149.90 USD per month for up to seven. Registration costs 149.00 USD per state as a one-time fee.
Who it is for
It suits businesses needing US sales tax registration and recurring returns across multiple states. The dashboard and state-response support help teams track filings and notices.
What is good
- Covers all 50 US states
- Handles registration and ongoing returns
- AI checks filings against updated state data
- Dashboard stores confirmations and filing records
- Reviews state flags with customers
What to know first
- Ongoing filing requires prior state registration
- Coverage is limited by plan
- Registration costs 149.00 USD per state
- No free plan
Verdict
Sigma Files combines nexus review, permit registration, and automated return filing in one service. Its monthly plans scale by state count, while registration is charged separately per state.
Sigma Files plans and pricing
All plansCompared on tax compliance software
- Free plan
- No
- Paid from
- $24.90/mo
- Jurisdictions covered
- 50 jurisdictions
- Supported tax types
- sales tax
- Return filing
- Yes
- Filing support level
- automated
- Tax registration
- Yes
