Irwin M. Slomka


Irwin Slomka focuses his practice on state and local tax controversies before administrative and judicial bodies in New York and throughout the United States.

He has broad experience in tax planning for the full spectrum of corporate and pass-through entities as well as individuals and their related business transactions. He also regularly advises and handles litigation for such industries as financial services, banking, real estate, telecommunications, retailing, and manufacturing.

Irwin regularly speaks on a variety of issues concerning the taxes of New York State, New York City, and other jurisdictions before organizations such as the New York State Bar Association Tax Section, the Committee on State Taxation, the Wall Street Tax Association, the Tax Executives Institute, the Institute of International Bankers, and the Committee on Banking Institutions. He spoke before the New York State Bar Association on the state and local tax issues involving GILTI. He has authored numerous articles that have appeared in such publications as Law360, the Journal of Multistate Taxation and Incentives, and the Real Estate Finance Journal. He has also been the principal author of several reports issued by the New York State Bar Association Tax Section, including recent reports on draft amendments to the New York State corporate franchise tax regulations.

Prior to going into private practice, Irwin served as deputy commissioner and general counsel for the New York City Department of Finance.


  • Successfully argued in 2019 before the Colorado Supreme Court on behalf of a client in a case involving the Colorado taxation of a corporate holding company with foreign subsidiaries.
  • Prevailed before the New York City Tax Appeals Tribunal in pre-empting the City of New York from forcibly combining a bank’s mortgage holding subsidiary.

News & Views

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  • 2022–2023, listed in The Legal 500 United States
  • 2009, 2013–2019, 2023, New York Metro “Super Lawyer” in Tax, listed in Super Lawyers
  • 2021–2023, Tax: State & Local – New York, listed in Chambers USA



  • New York State Bar Association Tax Section
Professional Activities

Irwin serves as the co-chair of the New York City Taxes Committee for the Tax Section of the New York State Bar Association, and is a member of the Tax Section’s Executive Committee.



  • New York


  • Brooklyn Law School, JD
  • Queens College, BA