• Welcome to Kessler Orlean Silver!

    With an over 80-year history, the mid-sized accounting firm of Kessler Orlean Silver & Co., P.C., provides innovative accounting solutions to business owners, executives and managers, private investors, and professionals.

    Out down-to-earth style and practical experience come from a long-time culture of helping people and feeling passionate about doing so!

  • What Sets Us Apart

    We care. Pure and simple.

    ‘Above and beyond’ dedication to client service is our highest priority. Clients tell us they appreciate our accessibility and outstanding service. We believe it’s essential that you receive our close personal attention with prompt answers and new ideas.

    No situation is too tough or too routine. Every challenge is viewed with a fresh eye and resolved with a creative solution.

    By placing our service standards front and center in the way we conduct business, you can expect to receive the highest quality service while we help you improve your business or personal financials.

  • On the surface, accounting firms seem a lot alike. But some stand out from the crowd. So what makes KOS different? Our people. Sincerely caring, really listening, and then putting your outcome ahead of our interests. It’s our exuberant: to put you above all else.


    Based in Deerfield, a Chicago suburb, KOS serves businesses and individuals in multiple states providing business consulting, accounting and bookkeeping, and tax services.

Firm Profile

Learn more about the firm’s people, philosophies, and client service commitment.


Our monthly newsletter is available online and keeps you current on tax and financial matters.

KOS News Ticker

  • KOS Partner Geoff Harlow on CBS 2 News - KOS Partner Geoff Harlow was interviewed by Dorothy Tucker of CBS 2 News for a segment that aired Tuesday, January 20, 2015 during the 5pm news. Geoff spoke on the big changes that will make filing taxes more complicated for tax payers this season. - Please visit the link below to view the story. As always, if you have any questions or need assistance, please contact your KOS advisor and they... More →
  • Thank You to all Attendees of the 2015 Economic Breakfast - Thank you to all of our KOS clients and friends who attended our 2015 Economic Outlook Breakfast on January 15th at the Chicago Botanic Garden! We are pleased to have had another successful event and have enjoyed the positive feedback from everyone. - A special thank you to our speakers as well - Mary Ellen Stanek, CFA of Robert W. Baird & Co., Spencer Klein, CFA of MB Wealth Management and... More →
  • How to Audit-Proof T&E Deductions - Follow strict record-keeping rules - Year in and year out, taxpayers claiming substantial deductions for travel and entertainment (T&E) expenses are prime audit targets of the IRS. This year should be no exception. But there is a way you can withstand any challenges on your return: Keep accurate records as required by the tax law. Here is a summary of the key tax rules for T&E expenses. -... More →
  • Searching for Miscellaneous Expense Deductions - Tax breaks that can fall through the cracks - As the start of another tax filing season dawns, you may be looking to increase the itemized deductions you can use to offset highly taxed ordinary income. What about those random expenses that often seem to fall through the cracks? If you qualify, you may be able to deduct a portion of your miscellaneous itemized expenses on your 2014 tax return. -... More →
  • Give Your Retirement Plans a Boost in 2015 - Diana Spatoulas, Senior Accountantdspatoulas@koscpa.com - The IRS announced 2015 increases to pension plan and retirement plan limits and phase-outs which give most retirement plan participants an opportunity to sock more away toward retirement. - Retirement Plan Contribution Limits - In 2015, the maximum contribution you will be able to make toward your 401(k), 403(b), most 457 plans, or the... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College