Accounting Services in Oakbrook Terrace, IL

Accounting and Tax Help for Oakbrook Terrace Offices and Residents

A small city with a large office market

According to the City of Oakbrook Terrace, it has about 2,752 residents and a daytime population of roughly 40,000. It counts more than 500 businesses, and ComEd, the Joint Commission, Exelon and Redbox are among its major employers. Not every tenant in those buildings is a large employer. If you run a consulting practice, agency or professional office with only a few people, the tax work looks very different from a corporate headquarters.

For a small firm, the first questions are usually about structure and payroll. We help owners weigh an LLC or S corporation setup and then run payroll once there are W-2 employees, including the Illinois withholding filings that come with them.

The city also lists more than forty restaurants, seven hotels and Drury Lane Theater. Restaurants and hotels deal with tipped wages, hourly shifts and daily sales tax collection. For them, bookkeeping that reconciles the register to the bank deposits each month does most of the work.

Sales tax depends on the address

Oakbrook Terrace is one of the DuPage County cities where the Illinois Department of Revenue lists rates by address. Since August 1, 2026, the city’s base general merchandise rate has been 8.25%. Addresses in the business district along Roosevelt Road are listed at 9.25%. A restaurant or retailer that moves or opens a second location a few blocks away can end up collecting a different rate, so it is worth checking the IDOR address file before the first return is due.

• Base city rate: 8.25% (effective 8/1/2026)
• Listed Roosevelt Road business district addresses: 9.25%

Business returns for pass-through entities

Office-based professional firms are often set up as S corporations or partnerships. Illinois charges those entities a 1.5% Personal Property Replacement Income Tax on net income, while a C corporation pays 2.5% plus the 7% corporate income tax. We handle business tax preparation for these entities and prepare the owners’ Illinois returns alongside them, so the K-1s and the 4.95% individual return match.

Near the office

Our office at 1323 Butterfield Rd in Downers Grove is about 3.5 miles by road from central Oakbrook Terrace. To talk through a return or a new entity, use the contact page or call (331) 264-4194.