Freedom251 › Tax Compliance Software
Sigma Files
What Sigma Files is
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 a month for one state; Growth costs $64.90 a month for up to three; Professional costs $149.90 a month for up to seven. Registration costs $149 per state as a one-time fee.
Who it suits
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 it does well
- 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 per state
- No free plan
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Essential | $24.90/mo · Filing compliance for 1 state · dashboard access · AI-verified, cross-checked filings | $24.90 a month |
| Growth | $64.90/mo · Filing compliance for up to 3 states · dashboard access · AI-verified, cross-checked filings | $64.90 a month |
| Professional | $149.90/mo · Filing compliance for up to 7 states · dashboard access · AI-verified, cross-checked filings | $149.90 a month |
| Sales tax registration | $149 per state; single, one-time fee · One state per registration | $149, paid once |
| Custom Coverage | Priced per state · Select exactly the states you need · dashboard access · AI-verified, cross-checked filings | On request |
As sigmafiles.com lists them, read 9 Oct 2026. The maker's own page has the final word.
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.
Facts from Sigma Files's own pages
- AI checks
- The site says its AI checks returns against current state rules, rates, thresholds, and forms using a database updated daily. · sigmafiles.com, 9 Oct 2026
- Coverage limit
- The site lists filing plans covering 1, up to 3, or up to 7 states, with custom coverage priced per state. · sigmafiles.com, 9 Oct 2026
- Dashboard
- The filing plans include dashboard access for status, documents, and messages, and the site says filing history and confirmations are kept in a secured user dashboard. · sigmafiles.com, 9 Oct 2026
- Data collected
- The privacy policy says the service may collect contact, financial, business, and communication information to provide its services. · sigmafiles.com, 9 Oct 2026
- Deductions
- The filing process identifies eligible deductions and exemptions, and the service says it applies maximum eligible deductions. · sigmafiles.com, 9 Oct 2026
- Filing
- For registered states, Sigma Files prepares and files returns on monthly, quarterly, or annual schedules. · sigmafiles.com, 9 Oct 2026
- Filing support level
- automated · sigmafiles.com, 22 Sept 2026
- Free plan
- No · sigmafiles.com, 22 Sept 2026
- Jurisdictions covered
- 50 · sigmafiles.com, 22 Sept 2026
- Prerequisite
- A business must be registered in a state before ongoing filing there; Sigma Files says it handles registration first if needed. · sigmafiles.com, 9 Oct 2026
- Privacy and compliance
- The privacy policy says Sigma Files complies with applicable data protection laws including GDPR and CCPA. · sigmafiles.com, 9 Oct 2026
- Product
- Sigma Files provides AI-powered sales tax registration and filing services across all 50 US states. · sigmafiles.com, 9 Oct 2026
- Registration
- The service reviews nexus and prepares and submits sales tax permit applications for states where a business has economic or physical nexus. · sigmafiles.com, 9 Oct 2026
- Return filing
- Yes · sigmafiles.com, 22 Sept 2026
- Security
- The privacy policy says the company uses encryption, secure servers, and access controls to safeguard personal and financial information. · sigmafiles.com, 9 Oct 2026
- Paid from
- 24.9 · sigmafiles.com, 22 Sept 2026
- State notices
- If a state flags a return, Sigma Files says it reviews the matter with the customer and handles the response. · sigmafiles.com, 9 Oct 2026
- Submission
- The filing goes directly to the state by its due date, and the customer receives confirmation and a record of what was submitted. · sigmafiles.com, 9 Oct 2026
- Support
- The site lists [email protected] for queries and says the company reviews state flags with customers and handles the response. · sigmafiles.com, 9 Oct 2026
- Supported tax types
- sales tax · sigmafiles.com, 22 Sept 2026
- Tax registration
- Yes · sigmafiles.com, 22 Sept 2026
Where Sigma Files stands on Freedom251
- Tax Compliance Software#86 of 105