Thomas M. Kosinski, CPA, MST

Thomas M. Kosinski, CPA, MST

P 312.670.6247 | F 312.670.8301

Tom Kosinski has been with ORBA since 1994 and became a Director in 2001. His career focuses mainly on offering strategic tax planning and technical advice for individuals and their closely-held companies. Tom provides a full range of consulting to high net worth individuals and business entrepreneurs. He has significant experience in the commodities and securities industry.

Tom is also the firm’s primary consultant on U.S. tax issues relating to international taxation. Tom assists U.S.-based entities in planning for foreign activities and operations as separate entities, branches or divisions. He has researched and implemented tax savings and benefits for federal, state and international tax planning, assisted with tax consulting for individuals and corporations, and represented numerous Illinois taxpayers during IRS and Illinois Department of Revenue audits.

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Firms News


ORBA Human Resources Director Sarah Wonnell Appointed Board Chair of Windy City Performing Arts
Ostrow Reisin Berk & Abrams, Ltd. (ORBA), one of Chicago’s largest public accounting firms, is proud to announce that Human Resources Director Sarah Wonnell has been appointed as the new board chair of Windy City Performing Arts (WCPA) for a one-year term. Windy City Performing Arts is a not-for-profit organization that sings to inspire change, celebrate diversity and honor the dignity of the LGBTQ+ community.

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Media Mentions




ORBA will gladly provide you with hard copies of the useful guides listed below. Select which guides you would like to receive and submit the form below.

  • Tax Pocket Guide
  • Tax Planning Guide
  • Records Retention Schedule
  • Auto, Travel & Business Log

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Forward Thinking
Forward Thinking