Sidr Tax is ranked #50 of 109 in tax compliance software on Freedom251, made by Sidr Tax (Dover, Delaware, United States). It runs on API. There is a free plan. Paid plans start at $60/mo.

Sidr Tax plans and pricing

All plans

Free Free Zero monthly subscription fees; free nexus monitoring Nexus monitoring across all states · Detailed reporting and analytics · CSV transaction imports · Historical liabilities analysis · Comprehensive risk assessment · Address validation sidr.io · 22 Sept 2026

Plus $60/mo $60 per filing; $150 per state registration Automated filing and remittance · Registration and deregistration · Virtual mailbox for state notices · Rooftop-accurate tax calculations · Automatic tax code classification · Enhanced filing autopilot sidr.io · 22 Sept 2026

Premium Advanced API access · Dedicated account management · Priority access to sales tax experts · Volume-based discount · Voluntary Disclosure Agreements · Error insurance coverage sidr.io · 22 Sept 2026

Compared on tax compliance software

Free plan: Yes
Supported tax types: sales tax
Return filing: Yes
Filing support level: automated
Sales tax calculation: No
Tax registration: Yes
API access: Yes

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