Zamp has announced the global launch of Zamp OS, the Operating System of Sales Tax. The company has raised $30 million in total funding, with the latest round led by Acrew Capital with participation from Thomson Reuters Ventures. Several of Zamp's accounting firm partners also invested directly in the round.

Zamp is the Operating System of Sales Tax. The company combines AI agents with tax professionals to own the entire compliance lifecycle - filing, registration, taxability, notices, and data import - end-to-end, across all 50 U.S. states and 100+ countries. Zamp sources its own tax data, owns every workflow, and guarantees the outcome: if Zamp gets it wrong, Zamp covers the penalty. 120+ accounting firms trust Zamp to deliver managed sales tax compliance to their clients - as a referral partner or white-label service. 99.97% filing accuracy. $300M+ remitted. 100,000+ on-time filings. 12x output per compliance resource. 97.8% client retention.