• 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

  • IRS Warns of New Phone Scam Involving Bogus Certified Letters - Reminds the Public to Remain Vigilant Against Scams, Schemes this Summer - IR-2017-107, June 15, 2017 - The Internal Revenue Service warned people to beware of a new scam linked to the Electronic Federal Tax Payment System (EFTPS), where fraudsters call to demand an immediate tax payment through a prepaid debit card. This scam is being reported across the country, so taxpayers should be alert to... More →
  • Tax Angles for Self-Employed Individuals - Numerous tax aspects to consider - Being self-employed has its advantages and disadvantages. As the person in charge of your business affairs, you can set your own schedule and generally have more flexibility than someone in a 9-to-5 job. On the other hand, you are fully responsible for the bottom line, often with little or no backup to rely on. - What about taxes? There are a number of special... More →
  • News Briefs - A Tax Credit Back in Session - If your young children are going back to school soon, you may need to pay someone for after-school care, especially if both you and your spouse work. However, there is a silver tax lining - you may qualify for the dependent care credit. This credit is available for childcare costs for children under 13 years of age. Generally, the maximum credit is $600 for one... More →
  • Volunteer for These Charitable Deductions - How to write off out-of-pocket expenses - Do you help your favorite charity with more than just money? Although you cannot deduct the value of your volunteer services, you are entitled to a charitable deduction of your out-of-pocket expenses. Of course, the other usual rules for charitable deductions, including the recordkeeping requirements, still apply. - What sort of expenses are we talking... More →
  • Tax Opportunity for Renting out Your Vacation Home - If you own a vacation home that you and your family use personally, there is a unique tax window of opportunity for short-term rentals. Generally, income that you receive for the rental of your vacation home must be reported on you federal income tax return. However, if you rent out the property for only 14 days or less per year, you do not have to report any of the rental income. IRS Publication... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College