Marilyn A. Wethekam Partner
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  • F 312.267.2220
Marilyn A. Wethekam
"I’ve seen state tax issues from both sides of the table—and understand the solutions these complex issues require."

Marilyn is a partner at HMB and a member of the firm’s State and Local Tax (SALT) Group. She advises Fortune 500 companies on the resolution of complex multi-state and multi-national tax issues.

Marilyn assists publicly traded multinational and multistate clients work through sophisticated multistate income, franchise and transaction tax matters. Clients benefit from her wealth of experience in SALT, 18 years of which were spent in-house at Mobil Oil and Montgomery Ward & Co.

On behalf of clients facing intense scrutiny, Marilyn formulates multistate audit strategies— and has represented them before taxing authorities in more than 35 states. She has helped companies adopt new organizational structures that have reduced their tax burdens and improved their financial positions.

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A Leader in the SALT World

Marilyn is one of the most recognized forces in the SALT community. She’s the recipient of the Council of State Taxation’s Paul Frankel Excellence in State Taxation Award, Bloomberg BNA’s Excellence in State Taxation Award, Tax Analyst’s Leading Female Tax Counsel and is noted as one of Crain’s Chicago’s Notable Women Lawyers.

Clients rely on Marilyn for innovative and practical solutions driven by her in-house experience and profound understanding of the SALT world.


  • University of Illinois, Chicago School of Law, LL.M.
  • IIT Chicago-Kent College of Law, J.D.
  • Loyola University, B.A. in Political Science


  • Illinois
  • Texas


  • Illinois Super Lawyers, 2019-2021
  • Chicago’s Notable Women Lawyers, Crain’s Custom Media, 2018
  • Franklin C. Latcham Award, Bloomberg BNA, 2012
  • Paul Frankel Excellence in State Taxation Award
  • Bloomberg BNA, Frank Latcham Award for Distinguished Service in State and Local Tax Law, 2012
  • Outstanding Women in Tax by Tax Notes, 2016

Professional Memberships

  • American Bar Association
  • Bloomberg BNA State Tax Advisory Board
  • Chicago Tax Club
  • Council on State Taxation, Past Chair
  • Georgetown University Institute on State and Local Taxation, Advisory Board Member
  • Illinois State Bar Association
  • Paul J. Hartman State Tax Forum, Advisory Board Member
  • Texas Bar Association
  • State Tax Notes, Advisory Board Member



  • Marilyn A. Wethekam Published in Tax Notes – “Tin Cans and Sheep”May 3, 2022

    Marilyn A. Wethekam’s “Tin Cans and Sheep,” was recently published in Tax Notes State's article, “Justice Stephen Breyer: A Model of Clarity.” In her section, she reflects on Justice Stephen Breyer’s role in interpreting and shaping state tax law and discusses what his retirement will mean for the state and local tax community.

  • Marilyn A. Wethekam Published in Tax Notes State – “2022: The New Normal”January 18, 2022

    In this installment of Board Briefs, Tax Notes State advisory board members, including HMB’s Marilyn A. Wethekam, welcome the 2022 new year. Read the entire Board Briefs here. Download Marilyn’s article here. 2022: The New Normal By Marilyn A. Wethekam 2020 could be characterized as the year one learned to manage the shock of COVID. 2021 could be characterized as…

  • Marilyn A. Wethekam Published in State Tax Notes - "State and Local Tax Policy in a COVID-19 World"April 13, 2021

    In State Tax Notes' Board Briefs, Marilyn A. Wethekam discusses "State and Local Tax Policy in a COVID-19 World". Download the full Board Briefs by State Tax Notes here. 2020 began on an optimistic note. The economy, in several sectors, was thriving. States over the last couple of years had seen continued revenue growth and even in some cases were…

  • Marilyn A. Wethekam Published in Tax Notes State - "The Dissenter"November 2, 2020

    In this excerpt in Board Briefs from Tax Notes State, Marilyn honors the late Supreme Court Justice Ruth Bader Ginsburg. Download the full article by Tax Notes State here. On September 18, 2020, this nation lost not only an exceptionally accomplished jurist but a powerful voice for gender equality and those who have been made to feel they don’t belong.…

  • Marilyn A. Wethekam Published in Tax Notes State - "Controlling the Way in Which We Respond"July 6, 2020

    In her excerpt from the first installment of Board Briefs in 2020 from Tax Notes State, Marilyn addresses tax issues related to the digital economy. Download the full article by Tax Notes State here. In the words of that great philosopher Snoopy, “When you can’t control what’s happening around you, challenge yourself to control the way in which you respond.”…



  • In the Matter of Product of Conagra Foods Ingredient Co., New Mexico Administrative Hearing Office, Dkt. No. 17-39, September 15, 2017October 2, 2017

    The New Mexico Office of Administrative Hearings granted Conagra Foods? Motion for Summary Judgment concluding the interest earned on notes was properly characterized as non-business income.

  • The Cubs Won the World Series and Illinois Finally Has a Budget!July 7, 2017

    Today marks the first time in over two years that Illinois will be operating under a budget. This is a result after the House voted to override Governor Rauner?s veto of Senate Bill 9. The House garnered the necessary votes to end the two year stalemate full of political puffery and sparring. Some of the relevant changes that Illinois? taxpayers should be aware of are noted below. All changes are effective July 1, 2017, unless otherwise noted.

  • Factor Presence Nexus- Be Careful What You Wish For!September 14, 2016

    A recent Chief Counsel?s Ruling issued by the California Franchise Tax Board illustrates the issues and potential opportunities that arise as a result of adopting a factor presence nexus standard.

  • Tax Deficiencies and Automatic Penalties: Challenging by Reasonable Cause?December 12, 2014

    Increasingly, taxpayers are seeing the imposition of penalties on deficiency assessments. In fact in a number of situations the imposition of the penalty is automatic upon the issuance of the assessment. The penalties, which may range from 20% to 25% of the liability, are imposed for late payment or underpayment of taxes. Such penalties are generally imposed without taking into consideration the fact there is a lack of guidance or legal authority with respect to the substantive issue which gave rise to the tax underpayment...

  • University of Illinois, Chicago School of Law, LL.M.
  • IIT Chicago-Kent College of Law, J.D.
  • Loyola University, B.A. in Political Science
  • Illinois
  • Texas
500 West Madison Suite 3700
Chicago IL 60661

Phone: 312-606-3200 Fax: 312-606-3232
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