About Basis
Basis builds AI agents that take on structured accounting work end to end rather than assisting with pieces of it — month-end close, transaction processing, reconciliation, and increasingly tax and audit workflows. The distinguishing demonstration was an agent autonomously completing a 1065 partnership return, a filing complex enough that most automation stops at data entry.
Founded in New York in 2023 and led by CEO Matt Harpe, Basis raised a $100M Series B in February 2026 at a $1.15B valuation, led by Accel with Google Ventures and Lloyd Blankfein participating. It reports deployment across roughly 30% of the Top 25 US accounting firms, driving 20–50% efficiency gains, and OpenAI has published a case study on how it turns model progress into agents firms will trust.
Agentic AI that works autonomously for hours at a stretch on multi-step accounting and tax workflows — including completing an end-to-end 1065 partnership return — rather than answering questions or filling single fields.
Highlights
- Raised $100M Series B at a $1.15B valuation in February 2026, led by Accel with GV participating
- Deployed across roughly 30% of the Top 25 US accounting firms, reporting 20–50% efficiency gains
- Demonstrated the first AI agent to autonomously complete an end-to-end 1065 partnership return
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