Joni M. Kupar EA Ltd. is a full-service accounting firm based in St. Charles, Illinois, serving individuals and businesses in the Tri-Cities area. The firm provides tax and accounting support for clients with a range of financial and business needs, including planning, compliance, and day-to-day accounting matters.

Its listed services include tax services, bookkeeping, payroll, sales tax, and IRS notice or audit help. The firm also supports new business formation and offers online tax and financial resources such as forms, calculators, tax tips, news, and financial guides. Services are available for individual taxpayers and small businesses, with in-person and remote formats noted in the profile facts.