• 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

  • Estate-planning Ideas for a Blended Family - Modern techniques for modern times - In this day and age, it is not unusual for a spouse, children and grandchildren from a second or even third marriage to form a so-called blended family. But these additions to the clan can complicate estate planning. Keeping that in mind, the following tools may be useful for blended families: - Will: Your will is the centerpiece of your estate plan and should... More →
  • Bigger Tax Rewards for Your Generosity - Special tax break for gifts of property - Facebook founder Mark Zuckerberg made news recently by promising to give away 99% of his net worth, including his Facebook shares, to charity. The arrangement takes advantage of a unique tax break for charitable gifts of appreciated property, such as stock. - Background: If you have held property long enough for it to qualify for a long-term capital gain... More →
  • Dream Job Just Ahead - At KOS we focus on pushing ourselves and others to be better every day. This means helping each other and our clients grow through continual learning and sharing information.If we are not learning we are not growing. Please help us and others grow by sharing our LinkedIn job update with your network.We are actively seeking experienced Accounting and Auditing candidates as well as entry level... More →
  • Facts and Figures - Timely points of particular interest - ACA Reporting—Due dates for filing certain Affordable Care Act (ACA) forms have been extended. Individuals should have received 2015 Form 1095-B by March 31, 2016, postponed from February 1, 2016. Also, the due dates for filing Forms 1094-B and 1094-C with the IRS, as mandated by the ACA, were changed from February 29, 2016, to May 31, 2016 (and from March... More →
  • Ins and Outs of Flexible Spending Accounts - Popular fringe benefit for employees - Flexible spending accounts (FSAs) can be a low-cost addition to your company’s benefits package. You can provide FSAs for your employees to cover health care expenses, dependent care expenses—or both—within certain tax law limits. - Background: An FSA is funded with pretax dollars, so there are significant tax savings for employees. Furthermore, as the... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College