Joseph M. Callahan

Joseph M. Callahan is a seasoned tax attorney with 40 years of experience guiding individuals and businesses through complex tax challenges. He began his career as a CPA with Deloitte in Manhattan, where he gained hands-on experience in accounting, compliance, and corporate tax matters, before transitioning to law. Since 1992, Joseph has been a trusted member of Mackay, Caswell & Callahan, P.C., and he is admitted to practice law in New York and Connecticut, as well as in U.S. District Court for the Northern District of New York, and the U.S. Tax Court. Joe helps clients navigate a wide range of IRS and New York State tax controversies, including audits, collection actions, offers in compromise, innocent and injured spouse relief, responsible person and shared liability matters, tax court and administrative appeals, trust fund recovery penalties, voluntary disclosures and international compliance matters such as FBAR reporting. By combining his accounting background with deep legal expertise, he provides practical, strategic guidance tailored to each client’s unique situation. Known for his thorough, results-driven approach, Joe works closely with clients to resolve disputes efficiently while protecting their interests. He understands that tax issues can be stressful and complex, and is dedicated to helping clients find clear, actionable solutions that minimize exposure, reduce risk, and achieve the best possible outcomes. Whether you are facing an audit, disputing a tax liability, or planning for future compliance, Joe Callahan brings the knowledge, experience, and commitment necessary to navigate the process with confidence.