Fosti

5.8easy start · #99of 108
in Tax Compliance Software

Free to practise onno
Well documentedyes
Runs where you workno

Runs on api, Web. Paid plans from $399/mo.

Fosti is ranked #99 of 108 in tax compliance software on The Geeks Club. It runs on API, Web. There is no free plan. Paid plans start at $399/mo.

Fosti plans and pricing

All plans

Starter $399/mo $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 getfosti.com · 10 Oct 2026

Growth $799/mo $799/mo; $8,600/yr · save 10% Up to 15 active clients · unlimited team members · custom subdomain & branding · priority support getfosti.com · 10 Oct 2026

Scale $1,499/mo $1,499/mo; $16,200/yr · save 10% Up to 35 active clients · advanced analytics · dedicated onboarding · 99.9% uptime SLA getfosti.com · 10 Oct 2026

Enterprise 35+ active clients getfosti.com · 22 Sept 2026

Enterprise Custom 35+ active clients · SSO & SCIM · custom integrations · white-glove onboarding · volume discounts available getfosti.com · 10 Oct 2026

Compared on tax compliance software

Free plan: No
Paid from: $399/mo
Supported tax types: sales tax
Return filing: No
Filing support level: assisted
API access: Yes

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The record

Purpose: Fosti is an operating system for sales tax practices, designed for multi-client, multi-state compliance at CPA firms.
Workflow: Its compliance workflow uses a five-step cycle that opens automatically for each active client, with sequential steps and logged actions.
Client portal: The white-label client portal lets clients upload data, approve liabilities, and track filing status, and is included in all tiers.
Worksheets: Fosti says its worksheets auto-populate from client data and flag material variances for senior review.
Modules: The product lists 11 modules, including CRM and nexus profiles, filing calendar, escrow ledger, document management, time and billing, and exemption certificates.
Integrations: The site lists Vertex, Avalara, OneSource, Sovos, TaxJar, NetSuite, QuickBooks, and Xero; it says import files are generated for Vertex, Avalara, and OneSource.
Returns engine: The site says Fosti’s native returns engine is planned for Q4 2026, with PDF generation for the top 15 states.
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.
Data residency: The site says all data is stored in U.S. regions and backups are daily.
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.
Limits: All tiers include unlimited states and the white-label portal, and the site says there are no per-return fees.
Upgrade notice: Fosti says it notifies customers when they reach 90% of their client limit, and upgrades are one click, prorated, and effective immediately.
Price from: $399/mo

Where it ranks on The Geeks Club

Best Tax Compliance Software in 2026#99 of 108

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Sources

getfosti.com· checked 10 Oct 2026