• Welcome to KOS!

    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.

    Our 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

  • Complying with the New Overtime Pay Rule - DOL regulations to take effect soon - The “final rule” on overtime pay, long anticipated by the business sector, was issued by the U.S. Department of Labor (DOL) this spring. However, changes in the regulations do not formally take effect until December 1, 2016. Because of that, employers still have time to make the adjustments necessary to be in full compliance. - The main rules for overtime... More →
  • Five Year-end Ideas for Your Business - Benefit from PATH Act extensions - Remember that year-end planning is not just for individuals (see Seven Timely Tax Moves in 2016). In fact, your business operation may benefit from tax moves in 2016 in the wake of several key extensions in the Protecting Americans from Tax Hikes (PATH) Act of 2015. Here are five ideas for small-business owners to consider. - 1. Max out on business equipment.... More →
  • KOS is Hiring! - Who do you know? We are actively seeking exceptional candidates for the following positions: - Tax Interns to work February to April 15, 2017 - Staff Accountants (December 2016 and May 2017 graduates) - Accounting and Auditing Supervisors and Managers (4-6 years of previous public accounting experience required) - The KOS Difference - Direct Client/ Partner Contact*Great People*Challenging... More →
  • Celebrate the Holidays in Tax Style - As a general rule, your deduction for business entertainment expenses is limited to 50% of the cost, no matter what the occasion. But there is an important exception for holiday parties or other corporate events. In this case, you may be able to write off 100% of the cost for a gathering held on the business premises or at an outside venue—even your own home. However, there is one catch: To... More →
  • Seven Timely Tax Moves in 2016 - Strategies for individual tax payers - Undoubtedly, the national elections will have an impact on personal taxes for years to come. But it is unlikely that a lame-duck Congress will enact changes that will significantly affect tax planning for 2016. Accordingly, here are seven tax moves for individuals to consider at the end of this year. - 1. Harvest capital gains or losses. Typically, you might... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College