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Thank you for visiting our website.

Michael J. Kosiak CPA is a full-service accounting firm serving clients throughout the Barrington area, dedicated to providing our clients with professional, personalized services and guidance in a wide range of financial and business needs.


On this website, you will find information about Michael J. Kosiak CPA, including our list of services. We have also provided you with online resources to assist in the tax process and financial decision-making. These tools include downloadable tax forms and publications, financial calculators, news and links to other useful sites. Whether you are an individual or business in or around Barrington, Michael J. Kosiak CPA has years of valuable experience assisting professionals with their accounting needs.

We welcome any questions or comments you may have. Feel free to contact us at any time:

  • Telephone...
  • (847) 304-4272
  • Fax...
  • (847) 304-4271
  • Michael J. Kosiak CPA
  • 50 Ela St Ste D
  • Barrington, IL 60010

You can also send us a message directly through the contact page of this website.