Basis announces $100M in new funding

Accounting solutions provider Basis has raised $100 million in Series B funding at a $1.15 billion valuation. The round was led by Accel (Miles Clements), along with GV (Google Ventures) and Lloyd Blankfein, and with Khosla Ventures (Keith Rabois and Vinod Khosla) and other existing backers doubling down. Other backers include leaders from fintechs, AI developers and enterprise software companies. 

Basis plans to use the capital to accelerate development of the platform as it continues building the most advanced agents to perform increasingly complex workflows, and to expand the company's engineering and ML teams.

As part of the announcement, Basis also highlighted an accounting agent capable of completing an entire 1065 tax workbook end-to-end. Mitch Troyanovsky, co-founder of Basis, said the company has been building a platform for coordinating agents since its founding in 2023. Since then the company has greatly improved its capabilities, which in turn have evolved its product offerings. The ability for an agent to perform a full 1065 workbook autonomously was released at the end of 2025. Troyanovsky said this would not have been possible without significant investments in the technology over the past few years. 

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"A partnership return is a long, interconnected workflow where every number has to be consistent across the entire workbook," he said in an email. "Getting a single answer right isn't the hard part. Getting hundreds of answers right, all consistent with each other, across a process that takes a human team 10+ hours is a fundamentally different problem. Solving that required significant investment in how we evaluate and ensure end-to-end accuracy over long, complex workflows."

The agent, like the others in the platform, is designed not to follow a specific deterministic process every single time but instead to account for the broader context of the problem placed before it. He noted there are agents that perform tasks across tax, audit and CAS workflows. Within tax alone, he said, firms are using it for 1040s, 1120s, complex K-1 analysis and more. 

"The reason we can cover that range is that Basis understands accounting holistically. It's built on foundational accounting principles, so it can extrapolate well to new types of work even if it hasn't seen that exact scenario before. Think of it less like a point solution and more like adding a capable team member who understands the full picture of what your firm does," he said. 

This is part of developing what is coming to be known throughout the industry as "long horizon" agents that are built for sustained, multistep processes from start to finish, often running for hours autonomously. 

"It's closer to delegating an entire engagement to a team member than asking a chatbot a question," said Troyanovsky. "The best analogy is what's happened in software engineering, where tools like Claude Code and Codex can now write and ship entire features autonomously. We're building that same class of agent, but for accounting."

Troyanovsky said Basis currently aims to focus on its three main practice areas for the coming year. 

"We're working with tax teams, audit teams and CAS teams deploying agents that can do real work. Because Basis understands accounting at a foundational level, it extrapolates well across different accounting contexts. The focus right now is deepening capabilities across those three practice areas," he said. 

Other investors include NFDG (Nat Friedman and Daniel Gross), Better Tomorrow Ventures, BoxGroup, Avid Ventures, Kris Fredrickson, Aaron Levie (CEO, Box), Adam D'Angelo (CEO, Quora; Board, OpenAI), Amjad Masad (CEO, Replit), Claire Hughes Johnson (former COO, Stripe), Clem Delangue (CEO, HuggingFace), Eric Wu (former CEO, Opendoor), Gautam Kedia (former head of machine learning, Stripe), Jack Altman (former CEO, Lattice), Jeff Dean (chief scientist, Google), Jeff Wilke (former CEO, Amazon Consumer), Kyle Vogt (CEO, Bot Company), Noam Brown (research scientist, OpenAI), Scott Belsky (former CSO, Adobe). 

Accel's Miles Clements will join Khosla Ventures' Keith Rabois on the board.