Short-Term Rental Taxes in Illinois: What STR Investors Need to Know in 2025

Illinois is home to world-class STR markets — Chicago's vibrant neighborhoods, the historic lead-mining town of Galena in the northwest corner, and the natural beauty around Starved Rock State Park. But Illinois also presents one of the most important state-level tax complications in the Midwest: it decouples from federal bonus depreciation. For STR investors planning to use cost segregation, this state-level difference is critical to understand before filing.

Illinois State Income Tax

Illinois taxes all personal income at a flat 4.95%. This applies uniformly to rental income — there are no lower brackets or income thresholds. For an STR investor generating $80,000 in net rental income in Illinois, the state income tax bill is $3,960 regardless of other income. This is lower than Minnesota or Wisconsin's top rates, but the bonus depreciation decoupling issue significantly complicates the picture.

CRITICAL: Illinois Does Not Conform to Federal Bonus Depreciation

This is the most important tax issue for Illinois STR investors. When the federal government allows 100% bonus depreciation on 5-year and 15-year assets identified in a cost segregation study, Illinois does not follow suit. Instead, Illinois requires those same assets to be depreciated on their regular MACRS schedules — 5-year assets over 5 years, 15-year assets over 15 years.

The practical effect: if a cost segregation study on your Illinois STR generates $150,000 in federal first-year bonus depreciation, you will need to add back the excess depreciation on your Illinois IL-1040 and use the regular MACRS amounts instead. Your Illinois taxable income will be significantly higher than your federal taxable income in Year 1. Over the full asset life, the total depreciation taken is the same — Illinois just doesn't allow the front-loading. Work with a CPA experienced in Illinois state tax to handle the addback correctly.

The federal benefit is still 100% real and valuable. A $150,000 federal deduction at 37% saves $55,500 in federal taxes. The Illinois impact (adding back perhaps $120,000 at 4.95%) costs approximately $5,940 more in state tax in Year 1 — a net benefit of $49,560. Cost segregation is still highly profitable in Illinois; just don't expect to eliminate your Illinois tax bill the same way you can in Tennessee or Texas.

Illinois Sales and Lodging Taxes

Chicago STR Regulations: A Complex Market

Chicago has one of the most heavily regulated STR environments in the Midwest. The city requires all STR operators to obtain a Shared Housing Unit license or a Vacation Rental license, depending on the property type. The licensing process involves registration with the city and ongoing compliance reporting. Chicago prohibits STRs in certain building types and zoning districts. The high combined tax rate (~17.4%) is among the highest in the United States — comparable to New York City. Despite the regulatory burden, Chicago STRs in approved areas (River North, Lincoln Park, Wicker Park, the Loop) can generate excellent revenue driven by convention traffic, tourism, and corporate demand.

Top Illinois STR Markets

• Chicago: High-volume market; heavily regulated; high tax rates; excellent revenue potential in approved zones; permits required before operation
• Galena: Historic mining town in northwest Illinois; weekend getaway from Chicago; antique shops, vineyards, rolling hills; cabin and B&B-style properties do well; much simpler regulatory environment than Chicago
• Starved Rock / Utica area: Illinois's most-visited state park drives year-round cabin demand; smaller market but strong occupancy during fall foliage and spring
• Chain o' Lakes (Lake County): Chicago-area lake market; waterfront properties with strong summer demand; limited supply relative to proximity to Chicago

Cost Segregation in Illinois: Still Worth It

Despite the bonus depreciation decoupling, cost segregation studies are highly beneficial for Illinois STR investors — you just need to plan around the state-level addback. The federal savings typically dwarf the state impact. A $500,000 Chicago or Galena property with $130,000 in first-year federal bonus depreciation saves approximately $48,100 federally (at 37%). The Illinois addback increases state tax by roughly $5,600 — still a net $42,500 benefit. Galena and Starved Rock properties tend to have higher personal property ratios than urban Chicago apartments, often achieving 25–35% of purchase price in short-life assets.