• 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

  • KOS 4th Annual Professional Development for the Woman Business Leader - A breakfast workshop for women who want to build their - power, presence and communication skills - In today’s work environment, it’s not enough to be highly trained in technical skills. Delegating, motivating, team building, displaying a positive attitude and carrying yourself well are all crucial for success and taking your career to the next level. - Come learn from three dynamic women who... More →
  • How to Bridge the Retirement Gap - Making up lost ground quickly - What is your greatest financial fear? For some people, it is outliving their retirement savings. Besides the inherent volatility of economic markets and concerns about the viability of Social Security in the future, you may not have been able to save enough to secure a comfortable retirement. As things stand now, you may be afraid you will face a retirement... More →
  • Five Big Tax Penalties to Avoid - Cut your tax bill down to size - Paying income tax is bad enough, but insult is added to injury if you are assessed any tax penalties. There are numerous no-no’s for individuals and small-business owners to avoid, but here are five of the major offenses in the tax code. - 1. Payroll taxes: If a business willfully fails to deposit payroll taxes, the “responsible person” can be held... More →
  • Facts and Figures - Timely points of particular interest - IRS Is Hiring – Due to budget cuts and strains on resources, IRS examinations have been going down in recent years, hitting a low of 0.84% last year. But IRS Commissioner John Koskinen recently announced that the agency found enough money in the budget to hire as many as 700 new staffers. Most of the new hires are expected to be conducting audits or... More →
  • Reasons to Contact Your KOS Advisor Outside of Tax Season - Amanda Pictor, KOS A&A Manager - apictor@koscpa.com - Staying in touch with your KOS Advisor should be a year round agenda item. There are many things that your Advisor can assist with whether individually or with your business throughout the year. Communication is important and you should feel comfortable to ask questions whenever they arise. Listed below are some examples of why reaching... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College