• 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 News – Audits & Other Tidbits of Interest - What's going on at and with the IRS? Thought we would share the following items that run across our desk with you. - Brain drain is a big problem at the IRS as experienced tax examiners and managers continue to retire or go into the private sector and the agency has dwindling resources making it difficult to replace them. Over 30% of the IRS's workforce is at retirement age. The IRS audit staff... More →
  • Tax Aspects of Refinancing a Home Mortgage - Jeffrey Arnol, KOS Managing Partner - jarnol@koscpa.com - When thinking about refinancing your home mortgage, it is important to understand the tax rules regarding the deductibility of the interest you will pay, the points you may pay and other fees incurred in connection with the refinancing. - Interest that you pay on a home mortgage is deductible within limits depending on which category the... More →
  • Be Sure About Estimated Tax Payments - How to avoid underpayment penalties - Even though you just put your 2016 tax return to bed, you cannot rest easy. It is already time to pay attention to your tax liability for 2017. Significantly, you may be required to pay installments of “estimated tax” for this year, especially if you are self-employed or retired. - The next due date for quarterly installments is June 15, 2017. The first... More →
  • This Retirement Planning Move Avoids Tax - Benefit from a rollover to an IRA - If you receive a distribution from an employer’s retirement plan, such as a 401(k), you are generally required to pay ordinary income tax on the payout. However, with a timely maneuver, you can continue to postpone paying the tax until you are ready to make withdrawals. - Basic rules: There is no current income tax liability on a distribution from a qualified... More →
  • Last Minute Email Scams - Reprinted From the IRS Website – www.irs.gov - The IRS, state tax agencies and the tax industry urged both tax professionals and taxpayers to be on guard against suspicious activity, especially email scams requesting last-minute deposit changes for refunds or account updates. - Recommendations for tax professionals: - Verbally reconfirm any change of address or direct deposit change to a refund... More →
"[KOS is] friendly, approachable, and always willing to help me find the answer to a question." - Joan Meyer La James International College