In December 2024, Ian Crosby's bookkeeping startup Bench collapsed almost overnight - locking hundreds of small business owners out of their financial records days before year-end tax deadlines, with almost no warning. Khosla Ventures has now bet $10 million that Crosby can build something better.
His new company, Synthetic, is pitching fully autonomous AI bookkeeping for startups. Where Bench used human bookkeepers backed by software, Synthetic aims to remove the human bookkeeper from the loop entirely. The AI categorizes transactions, reconciles accounts, and generates financial reports without ongoing human review of each line item.
Why Bench Failed and Why That Matters Here
Bench's failure wasn't a slow wind-down - it was an abrupt shutdown that left customers scrambling to recover their data in real time. The underlying problem: human bookkeeping is expensive, and the unit economics of providing it at low monthly prices never worked at scale. Crosby's willingness to re-enter the same market, and Khosla's willingness to back him, is a bet that AI agents can now do the actual bookkeeping work reliably enough to remove that labor cost.
If an AI can correctly categorize 90-95% of transactions with no human hours attached, the margin math flips entirely. That's the thesis.
The harder question is whether autonomous bookkeeping can handle the compliance edge cases that small businesses actually face: state-specific tax rules, industry-specific accounting treatments, audit defense documentation. Categorizing Stripe and QuickBooks transactions accurately is one challenge. Handling a multi-state sales tax audit or a cap table adjustment is a different one entirely. Those are the scenarios where human bookkeepers currently earn their fees - and the scenarios Synthetic will need to demonstrate it can handle before business owners hand over their financials to a fully automated system.