Freedom251 › Tax Compliance Software
Fosti
What Fosti is
Fosti is a web and API operating system for CPA firms handling sales-tax compliance across multiple clients and states. Its workflow opens a five-step cycle for each active client, moves through sequential tasks, and logs actions. Every tier includes a white-label portal where clients can upload data, approve liabilities, and track filing status. Worksheets populate from client information and flag material variances for senior review. Eleven modules cover areas such as CRM and nexus profiles, filing calendars, escrow ledgers, document management, time and billing, and exemption certificates. Integrations listed include Vertex, Avalara, OneSource, Sovos, TaxJar, NetSuite, QuickBooks, and Xero; import files are generated for Vertex, Avalara, and OneSource. Return filing is assisted, while a native returns engine is planned for Q4 2026. Fosti states that it is SOC 2 Type II audited, uses AES-256 and TLS 1.3, isolates tenants, stores data in U.S. regions, and makes daily backups. Plans start at $399 a month.
Who it suits
Fosti suits CPA firms coordinating sales-tax work for multiple clients in multiple states. It is intended for teams that need client collaboration, workflow tracking, and integrations rather than direct return filing today.
What it does well
- Five-step client workflows log sequential actions
- White-label portal included in every tier
- Eleven modules cover practice operations
- Unlimited states and no per-return fees
- API access and listed accounting integrations
What to know first
- Return filing is assisted, not direct
- Native returns engine planned for Q4 2026
- Starter supports up to five active clients
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Starter | $399/mo; $4,300/yr · save 10% · Up to 5 active clients · up to 3 team members · all 11 core modules · white-label portal · email support | $399 a month |
| Growth | $799/mo; $8,600/yr · save 10% · Up to 15 active clients · unlimited team members · custom subdomain & branding · priority support | $799 a month |
| Scale | $1,499/mo; $16,200/yr · save 10% · Up to 35 active clients · advanced analytics · dedicated onboarding · 99.9% uptime SLA | $1,499 a month |
| Enterprise | Custom · 35+ active clients · SSO & SCIM · custom integrations · white-glove onboarding · volume discounts available | On request |
As getfosti.com lists them, read 10 Oct 2026. The maker's own page has the final word.
Verdict
Fosti combines sales-tax workflows, client access, worksheets, and practice-management modules in a web and API platform. Firms should note the current assisted filing model and client limits that vary by plan.
Facts from Fosti's own pages
- API access
- Yes · getfosti.com, 22 Sept 2026
- Client portal
- The white-label client portal lets clients upload data, approve liabilities, and track filing status, and is included in all tiers. · getfosti.com, 10 Oct 2026
- Data residency
- The site says all data is stored in U.S. regions and backups are daily. · getfosti.com, 10 Oct 2026
- Filing support level
- assisted · getfosti.com, 22 Sept 2026
- Free plan
- No · getfosti.com, 22 Sept 2026
- Integrations
- The site lists Vertex, Avalara, OneSource, Sovos, TaxJar, NetSuite, QuickBooks, and Xero; it says import files are generated for Vertex, Avalara, and OneSource. · getfosti.com, 10 Oct 2026
- Limits
- All tiers include unlimited states and the white-label portal, and the site says there are no per-return fees. · getfosti.com, 10 Oct 2026
- Modules
- The product lists 11 modules, including CRM and nexus profiles, filing calendar, escrow ledger, document management, time and billing, and exemption certificates. · getfosti.com, 10 Oct 2026
- Purpose
- Fosti is an operating system for sales tax practices, designed for multi-client, multi-state compliance at CPA firms. · getfosti.com, 10 Oct 2026
- Return filing
- No · getfosti.com, 22 Sept 2026
- Returns engine
- The site says Fosti’s native returns engine is planned for Q4 2026, with PDF generation for the top 15 states. · getfosti.com, 10 Oct 2026
- Security
- Fosti states it is SOC 2 Type II audited and uses AES-256 encryption at rest, TLS 1.3 in transit, and per-tenant isolation. · getfosti.com, 10 Oct 2026
- Paid from
- 399 · getfosti.com, 22 Sept 2026
- Support and onboarding
- Starter includes email support, Growth includes priority support, and Scale includes dedicated onboarding; self-serve onboarding is stated to take under an hour. · getfosti.com, 10 Oct 2026
- Supported tax types
- sales tax · getfosti.com, 22 Sept 2026
- Upgrade notice
- Fosti says it notifies customers when they reach 90% of their client limit, and upgrades are one click, prorated, and effective immediately. · getfosti.com, 10 Oct 2026
- Workflow
- Its compliance workflow uses a five-step cycle that opens automatically for each active client, with sequential steps and logged actions. · getfosti.com, 10 Oct 2026
- Worksheets
- Fosti says its worksheets auto-populate from client data and flag material variances for senior review. · getfosti.com, 10 Oct 2026
Where Fosti stands on Freedom251
- Tax Compliance Software#88 of 105