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Our Offices & Hours
Our Clients
Our Staff
Our News

Our Offices & Hours

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.

Current Office Hours: 8:30 a.m. - 5:00 p.m. Monday through Friday

Tax Season Hours beginning February 1st:

East Office - 1471 Ring Road, Calumet City, IL, Monday-Friday 9:00am-6:00pm; Saturday 9:00am-1:00pm
West Office - 9980 190th St., Unit A, Mokena, IL, by appointment only

Attention tax clients! Please download the forms for remote and drop-off services, including the 1040 Engagement Letter, the S-Corp/Partnership Engagement Letter, along with our Drop-Off Questionnaire. Provide your tax documents in-person or by mail, or contact us for secure sign-in credentials to be provide electronically at This email address is being protected from spambots. You need JavaScript enabled to view it. or by calling (708) 862-2262.

Check out JKC's new tax preparation rates for 2025.

Phone Number: (708) 862-2262

Email Address: This email address is being protected from spambots. You need JavaScript enabled to view it.

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 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

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.

(708) 862-2262 This email address is being protected from spambots. You need JavaScript enabled to view it. This email address is being protected from spambots. You need JavaScript enabled to view it. Join our Newsletter