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    Welcome to John Kasperek Co., Inc.

    John Kasperek Co., Inc. (JKC) was founded in 1989 to serve the financial needs of the Chicagoland and Northwest Indiana area. Led by accomplished governmental consulting expert - founder and managing partner John Kasperek, Jr., CPA - our talented team of Certified Public Accountants and professional staff are dedicated to providing customized services to local units of government, nonprofit organizations, corporations and individuals at an affordable rate. The firm's truly unique expertise is rooted in extensive experience through our municipal and educational auditing and consulting engagements. As a boutique company, JKC's attention to detail and hands-on service from all levels of the firm is well received by clients and our team is highly motivated and dedicated to their continued success. We have a proven track record with impeccable results–evidenced by an impressive client list. 

    The Illinois Office of the Auditor General recently announced JKC as a Level 3 auditor of governmental audits, the highest certification.

    Tax Season News

    Attention tax clients! Please download the forms for remote and drop-off services, including the 1040 Engagement Letter, the S-Corp/Partnership Engagement Letter, and Tax Organizer, along with our Tax Prep Questionnaire. Provide your tax documents in-person or by mail, or contact us for secure sign-in credentials to provide electronically at This email address is being protected from spambots. You need JavaScript enabled to view it.. For more information, download our comparison of the 2020, 2021, 2022 tax law changes.

    We have two locations for convenient service:

    • West Office - 9980 W. 190th St., Suite A, Mokena, IL 60448 
      • By appointment only
    • East Office - 1471 Ring Road, Calumet City, IL 60409
      • Monday - Friday from 9am - 6pm; Saturdays from 9am - 1pm

    ShareFile: Security and Piece of Mind for our Clients

    We all share files with people both inside and outside our company daily — it's the nature of the modern working world. We know it's important to protect our data or our clients' confidential data, but it’s cumbersome to know when and how to send files securely. Secure file sharing means more than password protection and private email servers — you need to consider how and where the files are stored, how they're protected and how safe they are when you hit 'Send'. Please email This email address is being protected from spambots. You need JavaScript enabled to view it. to get your secure sign in access before the next time you send your sensitive files to JKC.

    • Our Clients

      Our Clients

      Our client list at John Kasperek Co., Inc. features a wide range of significant audit work including local governments, townships, school districts, municipal pension funds, not-for-profit organizations and common interest real estate associations. In addition, we also serve a variety of small business S-Corporations, Partnerships and individuals.

      We are happy to provide contact information for referrals upon request. Here is a sample of our client list.

    • Our Staff

      Our Staff

      Our team at John Kasperek Co., Inc., Certified Public Accountants is dedicated to providing quality, personalized financial guidance to local government, not-for-profit organizations, businesses, corporations and individuals.

      Managing Partner John Kasperek, Jr. has developed our team of professionals with an excellent working knowledge of the accounting principles and current standards to provide the highest level of excellence to our clients. Well known throughout Chicagoland area for his diverse expertise in all aspects of accounting, John has built a thriving company that serves the critical needs of the south suburban and northwest Indiana region.

      Please feel free to reach out to John or the rest of our team at John Kasperek Co., Inc. any time for answers to your questions. Email This email address is being protected from spambots. You need JavaScript enabled to view it. or call (708) 862-2262.

    • Our News

      Our News

      In order to better serve our clients, partners, friends and colleagues, John Kasperek Co., Inc. will issue a new monthly digital newsletter with relevant financial and accounting information, changes to auditing standards and procedures, news and announcements from our firm. Please email This email address is being protected from spambots. You need JavaScript enabled to view it. if you would like to be added to our digital newsletter distribution list.

      Additionally, we recently created an informative, consumer-focused accounting blog titled Your Friends that Count that is posted online at www.kasperekcpa.com/friends and is distributed through Facebook and LinkedIn.

      We will post press releases, announcements and stories from our firm to our Newsroom page.
    • Our Offices

      Our Offices

      John Kasperek Co., Inc.’s Corporate Office in Mokena is conveniently accessible from I-80 and Lagrange Road. JKC’s Calumet City Office is located near Torrence Avenue, I-80 and I-94. Our primary service area reaches throughout the Chicago Southland and Northwest Indiana region.

      We travel to our clients to provide services when and where they are needed.

      9980 190th Street, Unit A
      Mokena, IL 60448
      1471 Ring Road
      Calumet City, IL 60409
      (708) 862-2262
      This email address is being protected from spambots. You need JavaScript enabled to view it.

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