Numeral, the AI-powered sales tax compliance platform, today announced a $35 million Series B led by Mayfield, with participation from Benchmark, Uncork Capital, Y Combinator, and Mantis. The announcement follows a year of rapid growth for Numeral, which has processed over $5 billion in transaction volume, filed 150,000 sales tax returns, and achieved 3.5x year-over-year revenue growth.

Sales tax has become one of the most complex and costly compliance issues facing businesses. In the U.S. alone, there are over 11,000 tax jurisdictions, each with its own rules, deadlines, and definitions. In the first half of 2025, there have been over 400 sales tax rate changes, a substantial increase year over year. Even modestly sized companies must register and file in 30+ states, juggling monthly, quarterly, and annual filings.

This constant regulatory churn forces companies to spend tens of thousands of dollars each year on compliance tools, audits, and tax specialists just to stay current. Numeral solves that with a fully automated platform that manages the entire sales tax lifecycle: from nexus detection and state registration to filing, remittance, and exemption certificate management. The company offers an error-free filing guarantee, white glove support, and simple pricing.

“Numeral is transforming one of the most painful and error-prone functions in finance—sales tax compliance—by putting it on autopilot,” said Sri Pangulur, Partner at Mayfield. “Their AI-first platform eliminates the complexity of managing thousands of constantly shifting tax jurisdictions, enabling modern e-commerce and SaaS businesses to scale with confidence. We’re proud to lead their Series B and back their mission to become the intelligent system of record for global sales tax.”

“As operators, we lived the pain of sales tax firsthand: hours lost, filings missed, and constant second-guessing,” said Sam Ross, co-founder and CEO of Numeral. “We built Numeral to eliminate that friction entirely. This funding allows us to keep pushing the boundaries of what automation can do, so finance teams can focus on driving the business forward, not deciphering tax codes.”

“Kudos to the Numeral team. They’ve built an incredible platform and keep Ridge compliant across the country. It's been a breath of fresh air, and I can’t believe we didn’t migrate sooner,” said Avi Golan, CFO of Ridge.

Founded in early 2023 by Sam Ross, CEO, and Matt DuVall, CTO (engineer behind Stripe and Notion), Numeral now serves 2,000+ e-commerce and SaaS brands, including Ridge, Eight Sleep, Graza, Grüns, and Manus. The company supports compliance across 60+ countries with AI workflows and expert-backed service.

The Series B builds on earlier financing rounds, including a $4 million seed from Y Combinator and Uncork Capital and an $18 million Series A led by Benchmark Capital in March of this year. Together, these bring total funding to $57 million. Funding will fuel continued product innovation, global expansion, and AI-driven automation capabilities.

About Numeral

Numeral, founded in 2023 and based in San Francisco, simplifies the full lifecycle of sales tax compliance for e-commerce and SaaS companies: from nexus tracking and registrations to filing, remittance, exemption certificate management, and virtual mailbox services. Numeral supports over 2,000 active customers and is backed by Benchmark, Uncork Capital, Y Combinator, FundersClub, Mantis, and Mayfield. For more information, visit www.numeralhq.com.

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