Michael J.Wynne (Mike)


Chicago + 1.312.269.1515

Mike Wynne is known for delivering results-oriented strategies and solutions for clients in high-stakes tax and unclaimed property litigation and for transactional and policy issues. Mike draws on litigation experience in government and private practice, his planning and transactional experience in the Big 4, and his policy experience as a state tax agency general counsel.

Mike permanently enjoined a Cook County non-titled property use tax ordinance, overturned a 30-year state policy taxing compressed natural gas as motor fuel, obtained a dismissal of a Delaware unclaimed property qui tam case, tried qui tam tax cases in Illinois, and litigated the leading nonresident precedent against Illinois personal income taxes. Among Mike's other matters are unitary combined reporting cases, tax residency planning, telecommunications and cloud computing tax cases, and charitable property tax exemptions for health care, education, and government contracting. Mike also represents holders in unclaimed property multistate audits, voluntary disclosures, and in litigation.

Chambers recognized Mike as "renowned for his expertise in False Claims Act work" in Illinois, curtailing dozens of Illinois qui tam cases against wine shippers, and testifying against further such actions before an Illinois legislative committee.

Mike has been partner-in-charge of a Big 4 regional state tax practice group, general counsel of the Illinois Department of Revenue, and head of the Revenue Litigation Division of the Illinois Attorney General. He serves on the board of trustees of the Taxpayers' Federation of Illinois, is a former chair of The Chicago Bar Association's SALT (state and local tax) Committee, and is a frequent speaker before national groups, like COST, IPT, TEI, UPPO, and similar local groups.


  • AAF International acquires National Air Filter Service Company of New JerseyJones Day advised American Air Filter Co., Inc. dba AAF International, a subsidiary of Daikin Industries, Ltd., in the acquisition of National Air Filter Service Company of New Jersey, one of the oldest and largest full-service air filtration management companies in the United States.
  • Aaron's Company acquires BrandsMart U.S.A. for $230 millionJones Day advised The Aaron's Company, Inc., a leading technology-enabled, omnichannel provider of lease-to-own and purchase solutions, on its acquisition of BrandsMart U.S.A. for $230 million.
  • JourneyCare acquired by Addus HomeCareJones Day advised JourneyCare, Inc. in the $85 million sale of the Company to Addus HomeCare Corporation.
  • Delaware North sells Jumer’s Casino & Hotel to Bally's for $120 millionJones Day advised Delaware North, a global hospitality and entertainment company with operations in the sports, travel hospitality, restaurant and catering, lodging, gaming and specialty retail industries, in the sale of Jumer’s Casino & Hotel in Rock Island, Illinois, to Bally's Corporation for $120 million in cash.
  • Crestline Direct Finance provides $125 million senior secured term loan to subscription based online retailerJones Day advised Crestline Direct Finance, as administrative agent, collateral agent, and sole lead arranger, in connection with a $125 million senior secured term loan facility provided to a subscription based online retailer.
  • Speaking Engagements

    • November 12, 2018
      Tax Gambling -- Not Planning for Litigation
    • June 28, 2018
      Illinois - State of the State Chicago Tax Club Summer Session
    • June 25, 2018
      Federal Tax Reform and State Tax Implications IPT 2018 Annual Conference
    • May 23, 2018
      Sales Taxation of Services 2018 COST Intermediate / Advanced Sales Tax School
    • April 17, 2018
      Illinois Unclaimed Property Law Update
    • February 22. 2018
      SALT and Multinational Businesses: Analyzing State and Local Taxation of Foreign Transactions