• 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

  • Six Ways to Improve Cash Flow - Practical Ideas to Spur Business Growth - When you are running a small business, the numbers matter. This is especially true when it comes to cash flow. If you have more money going out than you have coming in, your business will not survive for very long. - How can you improve cash flow? There are no absolute guarantees, but these six practical suggestions should help. - 1. Review pricing... More →
  • Key Tax Rules for Deducting Home Improvements - When you can claim a medical deduction - Can you claim a tax deduction for a home improvement? That question is not as crazy as it sounds. It may be possible to write off part of the cost of a home improvement needed for medical reasons. However, be forewarned that there are significant tax obstacles to overcome. - Main ground rules: Under current law, your annual deduction for medical and dental... More →
  • Tax Relief on Tap for Disaster Victims - How to qualify for casualty loss deductions - Catastrophic events, such as hurricanes Harvey and Irma—or tornados, earthquakes, wildfires and the like—can severely damage your personal or business property. Small consolation: You may be entitled to deduct a casualty loss on your tax return. - A taxpayer qualifies for a casualty loss deduction if damage is caused by an event that is “sudden,... More →
  • IRS Releases Inflation Adjustments for 2018 - Each year, the IRS issues inflation adjustments for more than 50 tax provisions, including the tax rate schedules and other tax changes. Generally, these provisions are used to file tax year 2018 returns in 2019. These, of course, assume no significant tax law changes. - Among the adjustment are the following: - • The standard deduction for married filing jointly rises to $13,000, up $300 from... More →
  • Equifax Data Breach - Considerations for protecting your finances - On September 7, 2017, Equifax, one of the three main American credit reporting agencies, announced a massive cybersecurity incident that exposed consumer information - including names, addresses, birth dates, and Social Security numbers - leaving millions vulnerable to identity theft. Here are some things to consider to help protect your finances: -... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College