Platform Accounting Group Expands in Chicago

Firm Management | July 9, 2025

Platform Accounting Group Expands in Chicago

Madison Street Advisors, formerly McCormick Tax Group, is based in downtown Chicago and increases Platform’s presence in the Midwest region.

Isaac M. O'Bannon

Platform Accounting Group has announced an Illinois-based firm has joined the group. Madison Street Advisors, formerly McCormick Tax Group, is based in downtown Chicago and increases Platform’s presence in the Midwest region. Platform is a next-gen accounting and professional services group created in 2015 to preserve what’s great about boutique professional services firms while helping them support their people, productivity, and processes.

Madison Street Advisors is a mid-size national tax planning and preparation firm with a focus on audit mitigation strategies and reduction of audit profiles. Its team of attorneys, CPAs, and enrolled agents have extensive experience in representing clients in disputes with the IRS and state agencies. It also offers bookkeeping services, audit defense and resolution, and additional business services.

“We are excited to start this next chapter of our business,” said Michael T. McCormick, managing partner at Madison Street Advisors. “We know our clients intimately and understand their unique demands and needs. Partnering with Platform allows us to expand the services and offerings to both our clients and team members.”

Platform Accounting Group has more than doubled in size every year over the last 10 years, has nearly 1,000 employees across 16 states, and has a market-leading low turnover rate. While employees still enjoy the benefits of being part of a local firm embedded in a community, they gain access to a much broader range of growth opportunities and resources. Platform is continually building out an ecosystem to provide collaborative, best-in-class professional services from tax to wealth management, ERP consulting, business accounting services and more.

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Isaac M. O'Bannon

Isaac M. O'Bannon

Managing Editor

Isaac M. O'Bannon is the managing editor and digital content manager for CPA Practice Advisor (www.CPAPracticeAdvisor.com), drawing on two decades of experience covering the areas of professional accounting, taxation, business productivity and consumer technologies. . Prior to CPA Practice Advisor, O'Bannon was a consultant at firms in San Francisco, Denver and Tulsa, serving clients that included Logitech, Polycom, Hilti, Microsoft, the Stanford Research Institute, the University of Oklahoma's College of Engineering and other technology leaders. He is a U.S. Navy groundforces veteran (never a SEAL). Email: isaac.obannon - @ - cpapracticeadvisor.com . Isaac OBannon 2019 Cropped Small Headshot