San Francisco-based Byron, a tax preparation platform, announced its public launch, introducing AI agents that automate business tax preparation workflows for CPA firms, from processing client data to generating review-ready workpapers and tax return output.
The company also announced a $6.5 million seed round led by Square Peg, with participation from Sorenson Capital and Liquid2 Ventures.
Byron launches as accounting firms continue to face staffing shortages, with more than 120,000 open accounting and auditing roles annually, a declining pipeline of new CPAs and a workforce nearing retirement. At the same time, business tax work has become more complex while many firms continue to rely on manual processes, including rebuilding prior-year workpapers, calculating book-to-tax adjustments and reconciling data across spreadsheets, PDFs and other systems.
“Accountants don’t have a demand problem, they have a capacity problem,” said Blaze O’Byrne, co-founder of Byron. “That’s been true for years, but what’s changed is the technology. Until recently, most automation for CPAs focused on 1040 returns because business tax workflows were too complex to automate reliably. Firms are dealing with unstructured documents, inconsistent client data, changing tax rules and review-heavy processes that legacy software couldn’t manage effectively. Advances in large language models over the last six months have changed that, and it’s now possible to automate most of the business tax process while still allowing accountants to work directly in Excel.”
The platform integrates with existing tax software to support 1065, 1120 and 1120-S business tax returns. It also processes documents such as K-1s and performs federal, state, K-3 and footnote extractions.
The founding team includes former members of Amazon’s Artificial General Intelligence (AGI) team and Deloitte, combining experience in AI development and tax preparation.
