Sales tax compliance firm Zamp, which positions itself as the operating system for sales tax, has announced a total of $30m in funding to grow its accounting firm partnerships and advance its AI-powered platform.
The latest round was led by Acrew Capital, with Thomson Reuters Ventures and several of Zamp’s accounting firm partners also contributing. The raise adds to backing from early supporters including Friends & Family Capital, 20Growth, and Good Friends Venture Capital.
Zamp plans to put the capital to work across three priorities: growing its accounting firm channel, building out new product capabilities, and pushing into international markets spanning the EU, Australia, New Zealand, the UK, and over 100 countries. Certificate management is set to be the next major product addition, while the partnerships team, which has already tripled in headcount over the last six months, will target the world’s top 25 accounting firms.
Founded three years ago as a managed service, Zamp has since evolved into a full infrastructure layer for sales tax, owning the data and workflows across thousands of jurisdictions. Its technology handles filings, registrations, notices, data normalisation and taxability mappings end-to-end, and is accessible via dashboard, API, or white-label integration. An MCP currently in private beta allows accounting firms to pull compliance data directly into their own AI tools.
The platform pairs AI agents with qualified tax and legal professionals at every stage, and Zamp takes on financial responsibility if a filing error occurs. Its track record includes more than $400m in sales tax filed, 100,000 timely returns at 99.97% accuracy, and over 75,000 compliance notices processed.
Over 120 accounting firms use Zamp, among them Withum, Frank Rimerman, Larson Gross, Anchin, and Crew Finance, with partner retention sitting above 98%. On the direct customer side, businesses including Crumbl Cookies, Oats Overnight, David Protein, Cult Gaia, and Vapi AI rely on the platform for their sales tax operations.
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