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Joni M Kupar, E.A., Ltd. is a tax and accounting service located in St. Charles. Her firm provides accounting, personal and corporate tax preparation, payroll services, financial statement preparation, QuickBooks consulting, estate and tax planning.

Joni Kupar has more than 20 years of experience in accounting and taxation. Her expertise ranges from basic tax management and accounting services to more in-depth and complicated situations such as tax audits, financial statements and financial planning.

Joni's background and ongoing dedication to her field sets her apart as a professional that is highly qualified to prepare and file both personal and business tax returns. She always strives to provide her clients the personalized and individualized attention they deserve, plus offers guidance, suggestions and future planning. She's more knowledgable than online tax help and her work ethic, proactive approach and open communications are the reasons clients return year after year. 

Range of Services Provided:

Community Involvement

Joni is a long time resident of the Fox Valley area and is continually involved in local organizations, including Corron Farm Preservation Society and volunteers at Peck FarmSt. Charles Park District and Kane County Forest Preservation.


"Joni has provided personalized attention to all my tax filing and tax planning needs. Having multiple businesses, each with its own filing, along with my family’s personal tax filing has always proven to be a challenge, but Joni was able to handle all with true professionalism. She asked pertinent questions when needed and provided helpful suggestions moving forward. Her expertise in the ever-changing taxation laws has put my mind at ease, knowing that my filings are accurate and precise." ~K, Geneva-area business owner.