Sigma Files

6.3easy start · #81of 108
in Tax Compliance Software

Free to practise onno
Well documentedyes
Runs where you workno

Runs on Web. Paid plans from $24.90/mo.

Sigma Files is ranked #81 of 108 in tax compliance software on The Geeks Club. It runs on Web. There is no free plan. Paid plans start at $24.90/mo.

Sigma Files plans and pricing

All plans

Sales tax registration $149/mo Single, one-time fee per state Nexus review · AI-prepared and submitted permit application · Permit confirmation delivered to the dashboard sigmafiles.com · 22 Sept 2026

Essential $24.90/mo $24.90/mo Filing compliance for 1 state · dashboard access · AI-verified, cross-checked filings sigmafiles.com · 9 Oct 2026

Growth $64.90/mo $64.90/mo Filing compliance for up to 3 states · dashboard access · AI-verified, cross-checked filings sigmafiles.com · 9 Oct 2026

Professional $149.90/mo $149.90/mo Filing compliance for up to 7 states · dashboard access · AI-verified, cross-checked filings sigmafiles.com · 9 Oct 2026

Custom Coverage Select exactly the states needed · Full dashboard access · AI-verified, cross-checked filings sigmafiles.com · 22 Sept 2026

Sales tax registration $149 once $149 per state; single, one-time fee One state per registration sigmafiles.com · 9 Oct 2026

Compared 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

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The record

Product: Sigma Files provides AI-powered sales tax registration and filing services across all 50 US states.
Registration: The service reviews nexus and prepares and submits sales tax permit applications for states where a business has economic or physical nexus.
Filing: For registered states, Sigma Files prepares and files returns on monthly, quarterly, or annual schedules.
AI checks: The site says its AI checks returns against current state rules, rates, thresholds, and forms using a database updated daily.
Deductions: The filing process identifies eligible deductions and exemptions, and the service says it applies maximum eligible deductions.
Submission: The filing goes directly to the state by its due date, and the customer receives confirmation and a record of what was submitted.
Coverage limit: The site lists filing plans covering 1, up to 3, or up to 7 states, with custom coverage priced per state.
Prerequisite: A business must be registered in a state before ongoing filing there; Sigma Files says it handles registration first if needed.
State notices: If a state flags a return, Sigma Files says it reviews the matter with the customer and handles the response.
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.
Security: The privacy policy says the company uses encryption, secure servers, and access controls to safeguard personal and financial information.
Privacy and compliance: The privacy policy says Sigma Files complies with applicable data protection laws including GDPR and CCPA.
Data collected: The privacy policy says the service may collect contact, financial, business, and communication information to provide its services.
Support: The site lists [email protected] for queries and says the company reviews state flags with customers and handles the response.
Price from: $24.90/mo

Where it ranks on The Geeks Club

Best Tax Compliance Software in 2026#81 of 108

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Sources

sigmafiles.com· checked 9 Oct 2026
sigmafiles.com/how-it-works· checked 9 Oct 2026
sigmafiles.com/privacy· checked 9 Oct 2026