Numeral, the AI-driven sales tax compliance platform, has secured $100m in a Series C round as changing tax rules place growing operational pressure on businesses selling across multiple markets.
Insight Partners led the round, which also drew backing from Salesforce Ventures, Geodesic, Benchmark, Mayfield, FCVC, Y Combinator and Uncork. The company plans to put the capital towards faster product development and a broader offering for sectors such as software, manufacturing, distribution and wholesale. It will also add staff across its engineering, sales, marketing and product teams.
The raise arrives as tax obligations shift in step with new models of buying and selling. California has passed legislation that, from 2027, will apply sales and use tax to prewritten software, covering SaaS as well as software accessed remotely or delivered electronically. Businesses active in several states and countries must therefore track emerging obligations continuously and adjust their systems to match.
Numeral reports strong recent growth, with total transaction volume up 327% year-on-year. The firm anticipates handling more than 80 million transactions through its tax engine. Its customer base has also widened, with notable gains among software, distribution and manufacturing businesses, many of which face considerable change.
The platform covers the full sales tax compliance cycle, including nexus monitoring, registrations, tax calculation, filings, remittance and exemption certificate management. It also handles VAT and GST compliance in over 90 countries and integrates with more than 40 billing, financial and enterprise resource planning systems. Numeral pairs a deterministic tax engine with AI and automation to manage high-volume compliance, while customers and partners can turn to in-house specialists for complex queries.
According to the company, clients can cut time spent on filings and registrations by as much as 80%, and reduce manual spreadsheet work and filing mistakes by up to 95%. Its exemption certificate tool can save up to 400 hours annually. When businesses migrate existing certificates to the platform, Numeral frequently finds that between 30% and 40% fail validation, exposing compliance gaps that may have gone unnoticed.
Numeral has also introduced an accounting partner programme. Participating firms can refer clients, resell the platform, deliver their own services through it or guide clients during implementation, keeping advisers involved in their clients’ tax decisions. Partners receive premier support and further benefits tied to engagement and growth.
Ross and CTO Matt DuVall founded Numeral in 2023. The company raised a $35m Series B in September 2025, and its existing backers include Benchmark, Uncork Capital, Y Combinator, Mantis, FCVC and Mayfield.
Numeral co-founder and CEO Sam Ross said, “Sales tax has become a much bigger operational challenge as companies grow across markets, systems and business models. Businesses need infrastructure that can keep pace as rules and requirements change across jurisdictions, without adding more manual work for their teams. We’re building Numeral to provide that foundation, backed by tax expertise and service that customers can rely on.”
Ross added, “Our customers want to know that their tax obligations are being handled accurately while still having access to a person when a complex issue comes up. That expectation shapes how we build the platform and how we support each customer. As Numeral moves into additional industries and serves larger businesses, we’ll continue investing in both the technology and the tax expertise behind it.”
Copyright © 2026 RegTech Analyst
Copyright © 2026 RegTech Analyst
