Numeral Raises $100M Series C for AI-Powered Sales Tax Compliance

Tax rules change as fast as the way companies buy and sell. California recently passed a law extending sales and use tax to prewritten software — including SaaS — starting in 2027. The U.S. alone has more than 11,000 tax jurisdictions, and hundreds of rate changes hit every year. For companies operating across states and countries, that’s a constant stream of new obligations to track and build into their systems.

San Francisco-based Numeral automates that entire sales tax compliance lifecycle with AI — from nexus monitoring and registrations to tax calculation, filings, remittance, and exemption certificate management. It also handles VAT and GST compliance in more than 90 countries and connects with over 40 billing, financial, and ERP systems. Customers cut time spent on filings and registrations by up to 80% and reduce manual spreadsheet work and errors by up to 95%, the company says. Its exemption certificate management can save companies up to 400 hours a year — and when customers migrate existing certificates onto the platform, 30-40% often fail validation, surfacing compliance gaps they didn’t know they had. Numeral also just launched an accounting partner program, letting firms refer clients, resell the platform, or use it to deliver their own services.

The momentum shows in the numbers: total transaction volume is up 327% year over year, and Numeral expects to process more than 80 million transactions through its tax engine. Growth is broadening too, with a sharp rise in software, distribution, and manufacturing customers.

Numeral was founded in early 2023 by CEO Sam Ross, a former Airbnb product manager, and CTO Matt DuVall. Ross got the idea for Numeral while running several e-commerce businesses himself and running into the complexity of sales tax firsthand. DuVall previously built Stripe Checkout and Stripe Radar at Stripe and led performance and product engineering teams at Notion.

Numeral announced it had raised a $100 million Series C, led by Insight Partners, with Salesforce Ventures, Geodesic Capital, Benchmark, Mayfield, FundersClub, Y Combinator, and Uncork Capital participating. “We tracked this space closely and saw Numeral consistently deliver,” said Rebecca Liu-Doyle, Managing Director at Insight Partners. “With AI enabling the team to bring sophisticated tax and compliance infrastructure within reach of businesses that previously lacked access, Numeral has a strong foundation for continued growth.” Geodesic Capital’s Arvind Ayyala added that Numeral is “combining deep tax expertise with AI-native infrastructure to deliver tax compliance as an outcome.”

The round follows an $18 million Series A led by Benchmark in March 2025 and a $35 million Series B led by Mayfield that September at a $350 million valuation. With this Series C, Numeral has raised $157 million since founding.

Competition in sales tax automation is heating up. Anrok raised a $55 million Series C led by Spark Capital last month, pushing its total funding past $100 million; it counts Anthropic, Notion, and Cursor among its 3,000-plus customers and serves more than 40% of the Forbes AI 50. Longtime incumbent Avalara, a 26-year-old player, is reportedly preparing to go public again. Sphere targets a different segment — indirect tax compliance for later-stage, pre-IPO companies expanding internationally. Unlike its mostly U.S.-focused rivals, Numeral differentiates with broader global coverage, supporting tax obligations in more than 60 countries.