Byron has launched an AI agent platform for business tax preparation for CPA firms, designed to automate manual tasks throughout the tax workflow.
The San Francisco-based company also disclosed a USD $6.5 million seed round led by Square Peg, with participation from Sorenson Capital and Liquid2 Ventures.
Byron is entering a market where accounting firms face staffing pressures and heavier workloads. It cited more than 120,000 open accounting and auditing roles each year, alongside a shrinking pipeline of new CPAs and an ageing workforce.
That strain has coincided with growing complexity in business tax work. Many firms still rely on staff to complete returns by hand, rebuild prior-year workpapers, calculate book-to-tax adjustments, and reconcile information across spreadsheets, PDFs, and separate software systems.
The platform is built for 1065, 1120, and 1120-S business tax returns. It integrates with existing accounting tools, including Excel and tax software, and is intended to handle work from document intake to review-ready output.
Byron says the system rolls forward prior-year returns and workpapers into a current-year Excel workbook, requests missing client information, and processes the data for review. It uses specialised agents for tasks including book-to-tax adjustments, depreciation schedules, state apportionments, and partnership allocations.
The software can also process complex documents such as K-1s and delivers more than 97% accuracy across federal, state, K-3, and footnote extractions, according to Byron. Extracted figures are linked back to their sources and assigned confidence scores, enabling accountants to verify the output.
Byron says its model keeps accountants in control rather than removing them from the process. Teams can continue working in Excel while the platform keeps outputs synchronised and transfers approved data into existing tax software workflows.
Blaze O'Byrne, Co-founder of Byron, framed the launch around the staffing squeeze facing the profession.
"Accountants don't have a demand problem, they have a capacity problem," said O'Byrne.
"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," O'Byrne said.
Partner integrations
Two software groups also outlined their work with Byron as they look to bring the product into broader accounting workflows. Canopy and Truss each described the platform as a way to reduce time spent on repetitive tax preparation tasks.
"At Canopy, our core mission is to help accounting firms reclaim their time so they can focus on what matters most - their clients," said Davis Bell, Chief Executive Officer of Canopy.
"By integrating Byron's advanced tax workflow capabilities directly into our platform, we are eliminating one of the most manual, time-intensive bottlenecks in return preparation. We're thrilled to bring this seamless tax automation to our customers and continue driving true efficiency for the industry," Bell said.
Dan Pinkous, Founder and Chief Executive Officer of Truss, also commented on the company's evaluation of the product.
"We spend a lot of time evaluating technology that can actually improve the workflow experience for accounting firms, and Byron stood out immediately," said Pinkous.
"What impressed us most was the accuracy of the product, the consistency of the customer experience, and the speed at which firms were seeing value. That gave us confidence to deepen the partnership and expand access to Byron through the Truss platform," Pinkous said.
Customer firm Chawla and Chawla said the software was built around existing tax-preparation practices rather than serving as a standalone output tool.
"What stood out to us about Byron was that it wasn't just another AI tool generating outputs in isolation; instead, it was built around how tax work actually gets done inside a firm," said Anshul Chawla, Director of Corporate Development at Chawla and Chawla.
"The platform helps our team spend less time rebuilding workpapers and chasing down information, and more time focused on review and client service. That has a real impact on the day-to-day experience of our people during the busy season," Chawla said.
Security Focus
Byron says it is SOC 2 Type II compliant and uses encryption in transit and at rest, US-based data hosting, and role-based access controls. It also says customer data is not used to train underlying models, while workflow activity is logged for audit and review.
According to Byron, the founding team combines AI and accounting experience from Amazon's Artificial General Intelligence team and Deloitte.