21st State CPA LLC is a CPA accounting and tax firm based in Downers Grove, IL, serving businesses, small businesses, and individuals across the greater Chicago area. The firm provides accounting and tax support for clients who need help keeping financial records organized, preparing tax filings, or addressing IRS-related matters.

Its services include bookkeeping, payroll, corporate accounting, accounts payable and receivable, tax preparation, tax audit support, IRS representation, and IRS letter resolution. The firm works with clients through in-person and remote service formats and lists service areas that include Chicago, Naperville, Burr Ridge, Oak Brook, Schaumburg, Darien, Oak Lawn, Rosemont, Orland Park, and Willow Brook.