Zamp offers Zamp OS, a vertically integrated platform that owns the full sales tax compliance lifecycle—registration, filing, taxability, notice management and data import—by combining AI agents with in-house tax and legal experts. The company sources its own tax data across 12,000+ jurisdictions and provides coverage across all 50 U.S. states and 100+ countries. Since launch it has remitted over $300 million in sales tax, completed more than 100,000 on-time filings, handled over 75,000 notices, and reported 99.97% filing accuracy and 97.8% client retention in 2025. More than 120 accounting firms use Zamp’s platform, and the company says it has increased output per compliance resource by 12x. Zamp moved from a managed-service model three years ago to an operating system approach and is using its recent funding to scale the platform globally.

Total raised

$44M

Funding rounds

3

Latest round

Equity

Latest activity

Apr 2026