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May 14, 2026 • Marina Temkin

Synthetic raises $10M to build fully autonomous AI bookkeeper

Synthetic raises $10M to build fully autonomous AI bookkeeper Synthetic raises $10M to build fully autonomous AI bookkeeper Synthetic raises $10M to build fully autonomous AI bookkeeper

Khosla Ventures is betting $10M on Ian Crosby, whose first startup, Bench, imploded

The Founder's Second Act

Ian Crosby, whose previous startup Bench Accounting shut down in 2024 before being acquired for scraps, is launching a new venture aimed at automating bookkeeping through AI. His new startup, Synthetic, has raised $10 million in seed funding led by Khosla Ventures, with participation from Basis Set Ventures and Shopify CEO Tobias Lütke.

The Vision: Fully Autonomous AI Bookkeeping

Synthetic aims to build a fully autonomous AI bookkeeper that can generate accrual-based financials without direct human involvement. Key aspects of the approach:

  • All-or-nothing philosophy: "We're not going to release anything that's not fully autonomous. It's that or bust," says Crosby
  • Target market: AI and software startups only
  • Current status: Product still in design phase; Crosby acknowledges the vision may not yet be technologically possible
  • Timeline: The startup has "years of cash" and can wait for foundational models to become more reliable

The Technical Challenge

Crosby is candid about the current limitations:

  • AI models still make significant bookkeeping mistakes
  • The prototype works for a narrow group of users, but scalability remains uncertain
  • Analogy: "It's like a self-driving car that can drive down one street versus the self-driving car that can drive down any street. We haven't driven down enough streets to know if it's going to crash."

The Controversial Bet

Most investors would avoid a founder facing Crosby's challenges, but Khosla partner Jon Chu said: "I tend to run towards controversy a little bit."

Why Khosla Invested:

  • Chu cited Parker Conrad's 2016 ousting from Zenefits as a parallel—Conrad went on to found Rippling, now valued at nearly $17 billion
  • "I believe people have room for growth," Chu said
  • Due diligence revealed that executives who worked with Crosby after Bench "had fantastic things to say about Ian"
  • Crosby's three roles after leaving Bench (at Shopify, founding Teal, which was acquired by Mercury) provided opportunity to learn from past mistakes

The Bench Story:

  • Crosby was fired by Bench's board in 2021, three months after turning down a $250 million acquisition offer from Brex
  • Board disagreed with Crosby's strategic direction as the business was bleeding cash
  • Executive team was reportedly frustrated with his direct leadership style
  • Bench ultimately imploded under new management

Key Takeaways

  • Differentiation from existing solutions: Unlike human-assisted accounting startups like Xero, Synthetic aims for full AI autonomy
  • High-risk, high-reward approach: The startup is willing to wait for AI technology to catch up to the vision
  • Investor conviction: Khosla Ventures is betting on the founder's growth and the inevitability of AI bookkeeping automation
  • Narrow initial focus: Serving only AI and software startups allows for controlled scaling
  • Patience as strategy: With years of runway, Synthetic can afford to wait for foundational models to improve