This week, we saw a major vote of confidence in vertical AI. Basis just raised a nine-figure Series B as accounting firms lean into end-to-end agents across tax, audit, and client services.
Basis has raised $100 million in Series B funding at a $1.15 billion valuation, led by Accel, with participation from GV and Lloyd Blankfein, and with Khosla Ventures doubling down alongside existing backers.
The company builds AI agents designed specifically for accounting firms, deploying what it calls long-horizon agents that can autonomously complete complex workflows across CAS, Tax, and Audit. These agents operate in the background, coordinate tasks across processes, and return completed deliverables for review. In a recent demo, Basis showed an AI agent completing an end-to-end 1065 tax return autonomously.
The traction is notable. Basis is now working with approximately 30 percent of the Top 25 accounting firms. According to the company, firms are seeing 20 to 50 percent efficiency gains across practices, a meaningful figure in an industry facing sustained talent shortages, margin pressure, and mounting client expectations.
Accel’s Miles Clements, who is joining the board, framed it this way: “What stands out about Basis is how deeply they think about architecting and deploying real agents that do real work in the real economy.”
OpenAI’s Applied AI Lead, Prashant Mital, added that Basis is pushing models on “real-world, economically valuable, complex accounting tasks.”
The new capital will go toward accelerating platform development and expanding engineering and ML teams, as Basis builds increasingly complex agents. Internally, the company is also experimenting with an “agent-native” structure, with a dedicated Atlas team building agents across engineering, sales, and talent.
CEO and co-founder Matt Harpe put the mission plainly: “Our sole focus is to equip accountants with the highest performing, most accurate AI for accounting and to empower firms to drive new growth, provide higher-value service, and improve accountant quality of life across every one of their practices.”
The bigger signal here is not just another AI round at a billion-plus valuation. It is the shift from AI as assistant to AI as operator. In accounting, where workflows are structured, repeatable, and high stakes, the proving ground for end-to-end agents may be closer than many expect.
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This article was drafted with the help of generative AI using company-submitted details, then manually edited and carefully reviewed by a human editor before publication.
