• 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

  • Do You Have to Pay the NII Tax? - Computing tax liability on 2016 returns - As the deadline for filing 2016 tax returns approaches, some taxpayers are still struggling with the rules for the 3.8% tax on “net investment income” (NII). The tax law provision authorizing this special tax was included in the Affordable Care Act (ACA), the law known as Obamacare. Although the ACA may be repealed by the new Trump administration, it... More →
  • Immediate Tax Benefits for Business Property - Section 179 provides generous tax break - There is a unique tax break for business entities of all shapes and sizes contained in Section 179 of the Internal Revenue Code. Under this section, a business can elect to “expense,” or currently deduct, the cost of qualified property placed in service during the year, up to a maximum level. It is near-instant tax gratification. - Although the... More →
  • Answers to Commonly Asked Questions About Roth and Traditional IRAs - By: Diana Spatoulas, KOS Senior Accountant - dspatoulas@koscpa.com - Individual Retirement Accounts, or IRAs, play an important role in retirement planning. Part of the planning process includes determining whether a Roth IRA or Traditional IRA is best for you. Presented below is a list of commonly asked questions regarding IRAs, the purpose of which is to provide a basic and general... More →
  • Getting out of Credit Card Debt - Do you need a Snowball or an Avalanche? - By: Diana Spatoulas, KOS Senior Accountant - dspatoulas@koscpa.com - Now that 2017 is in full swing, the recent holidays of 2016 may seem like a distant memory. Colorful decorations and bright lights have been packed away and are out of sight. If it has not happened yet, soon a recap of holiday spending will make its inevitable appearance with the arrival... More →
  • Adjustments in Retirement Plan Limits - The IRS has announced its annual cost-of-living adjustments for certain retirement plan thresholds. Due to relatively low inflation rates, the adjustments for 2017 are minimal or nonexistent, as shown below. - Maximum annual dollar benefit for a - defined benefit plan $210,000 $215,000 - Maximum dollar limit on additions to - a defined contribution plan $53,000 $54,000 - Maximum amount of... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College