Rental Property Taxes in Illinois (2026 Guide)
Illinois pairs a simple flat income tax with two things landlords feel sharply: among the highest property taxes in the country, and a bonus-depreciation rule that spreads your federal deduction over seven years. Here is what IL landlords need for 2026.
In This Guide
1. Property Tax in Illinois
Illinois has among the highest effective property taxes in the country — commonly ranked second, at roughly 2% of value (it varies widely by county and methodology). For a landlord, property tax is often the single largest operating expense.
- No homestead relief for rentals — the General Homestead Exemption (35 ILCS 200/15-175) requires the owner to occupy the home as a principal residence, so it never applies to investment property.
- Cook County (Chicago) uses its own classification system (residential assessed at 10% of market value) and reassesses on a triennial cycle by township — expect periodic step-ups.
Planning tip: because rentals get no homestead exemption and IL rates are so high, model property tax carefully on every acquisition — and check whether your county’s reassessment year is coming up.
2. Illinois State Income Tax on Rental Income
Illinois taxes income at a flat 4.95% (35 ILCS 5/201) — the state constitution requires a single non-graduated rate. IL taxable income starts from your federal AGI, so net rental income from your federal Schedule E flows through with IL modifications.
- No capital-gains preference — gains on a sale are taxed at the same flat 4.95%, with no state long-term rate.
- Flat-rate simplicity — the lever is the timing and completeness of deductions, not bracket management.
3. The Bonus Depreciation Add-Back (IL’s Gotcha)
Illinois does not conform to federal bonus depreciation. If you claim §168(k) bonus depreciation federally — common after a cost-segregation study — Illinois makes you reverse most of it up front on Form IL-4562.
- Add back the federal bonus depreciation to IL income in the year you take it.
- Recover it over time — IL lets you subtract the add-back over the asset’s life (roughly one-seventh per year), with a catch-up subtraction in the year you sell.
- Regular MACRS still flows through — only the bonus component is reversed, and a 2025 IL law extends the add-back to §168(n) for tax years 2026 and later.
So a landlord who takes 100% federal bonus depreciation gets a much bigger first-year deduction federally than Illinois allows — IL spreads it out. The deduction is not lost; track the federal-vs-IL basis difference so it reconciles.
4. Real Estate Transfer Tax
Illinois charges a state real estate transfer tax of $0.50 per $500 of value (0.1%), and every county adds $0.25 per $500 (0.05%) — so $0.75 per $500 (0.15%) as a base.
Many municipalities (Chicago and other home-rule cities especially) stack their own transfer taxes on top, which can raise the effective rate well above the base — budget for the local component on any city sale.
5. LLC Annual Report and Fees
An Illinois LLC files an annual report with the Secretary of State for $75, due before the first day of the LLC’s anniversary month (you can file up to 45 days early). A $100 penalty applies if you miss the grace period.
6. Rent Control
Illinois bans rent control statewide. The Rent Control Preemption Act (50 ILCS 825) bars any unit of local government — including home-rule cities like Chicago — from regulating rents. Repeal is debated periodically, but the Act remains fully in effect for 2026, so there is no rent control anywhere in Illinois.
7. Security Deposit Rules (and Chicago RLTO)
Illinois sets no statewide cap on the deposit amount, but two statutes govern how you handle it — and Chicago adds much stricter rules:
- Return Act (765 ILCS 710) — landlords of 5+ units must give an itemized statement of deductions within 30 days and return the balance within 45 days; bad-faith failure exposes you to 2× the deposit plus fees.
- Interest Act (765 ILCS 715) — lessors of 25+ units must pay interest on deposits held over six months.
- Chicago RLTO — most Chicago rentals (a key carve-out: owner-occupied buildings of 6 or fewer units) require the deposit in a separate Illinois interest-bearing account with a signed receipt; mishandling carries steep penalties. Suburban Cook County has its own similar ordinance (RTLO).
If you rent in Chicago or suburban Cook County, the local ordinance — not just state law — controls your deposit handling, and the penalties for getting it wrong are severe. Treat the deposit as the tenant’s money held in trust.
8. How SheltrIQ Helps Illinois Landlords
SheltrIQ keeps the federal and Illinois sides of your return aligned:
- Bonus-depreciation tracking — flags the IL-4562 add-back and the multi-year recovery so your federal and IL depreciation stay reconciled.
- Depreciation schedules — builds 27.5-year MACRS schedules and tracks improvements, the basis for the IL adjustment.
- AI Schedule E classification — sorts each expense to the right line so your IL taxable income starts from an accurate federal return.
- Deadline reminders — keeps the anniversary-month annual report and estimated-payment dates on your radar.
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