Fosti review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Fosti is a cloud-based sales-tax practice management and compliance workflow platform for CPA firms handling multiple clients and states. Its 11 core modules cover filing calendars, client intake, five-step compliance workflows, white-labeled portals, nexus threshold monitoring, worksheet variance flags, filing and payment tracking, document management, escrow ledgers, time tracking, billing, profitability reports, and exemption-certificate tracking. The platform is suited to small, mid-market, enterprise, scaling, established SALT, and multi-office practices that need a shared operating layer for client compliance work.

Pricing starts with Starter at $399 per month or $4,300 per year, including all 11 core modules, a white-label portal, up to three team members, and email support. Growth costs $799 per month or $8,600 per year and adds unlimited team members, custom subdomain and branding, and priority support. Scale costs $1,499 per month or $16,200 per year, adding advanced analytics, dedicated onboarding, and a 99.9% uptime SLA. Enterprise includes everything in Scale, plus SSO and SCIM, custom integrations, and white-glove onboarding. This structure gives larger firms more operational and support capacity, but the entry price makes Fosti a substantial commitment for smaller practices.

Fosti’s ecosystem fit is a central part of its role. It integrates with Vertex, Avalara, OneSource, Sovos, TaxJar, NetSuite, QuickBooks, and Xero, while API access supports broader connectivity. The platform works alongside existing returns engines rather than replacing them, and filing support is assisted. That makes Fosti a strong choice for firms coordinating compliance operations across clients, states, documents, payments, and certificates. Firms seeking native tax calculation or direct return filing should choose a more complete tax-compliance platform instead.

Fosti pros and cons

• Where it wins
  • Covers calendars, workflows, portals, tracking, and audit trails
  • Integrates with Vertex, Avalara, OneSource, and other tax engines
  • Includes white-label client portals and multi-client compliance tools
• Where it doesn't
  • Starts at $399 per month with no free plan
  • Does not provide direct return filing or tax calculation
  • Email support is the listed channel on Starter

Fosti fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update