1031 Exchange Rules in Illinois
Last reviewed: June 2026. State rules change. Verify current forms before closing.
What Is Different in Illinois
Illinois is refreshingly uncomplicated for exchangers: a flat 4.95% income tax, no nonresident withholding at closing, no exemption paperwork, and no claw-back afterward. On Chicago-area commercial and multifamily gains, the flat rate still adds up fast — which is exactly why the exchange matters.
Does Illinois Conform to IRC Section 1031?
Yes. Illinois follows the federal like-kind exchange rules for real property. A 1031 exchange is an IRS-approved way to sell investment property and buy replacement property without paying tax on the gain right away. If your exchange qualifies for federal deferral, Illinois defers its income tax too. New to exchanges? Start with our 1031 exchange guide.
Your replacement property can be in any state, and Illinois has no claw-back or annual tracking of deferred gain afterward.
Illinois Tax Rate on Real Estate Gains
Illinois taxes income at a flat 4.95% for 2026. On a $500,000 gain, that is roughly $24,750 of state tax in addition to the federal bill. A qualifying exchange may defer all of it.
No Withholding at Closing
Illinois imposes no real estate closing withholding on nonresident sellers. There is no exemption certificate to request, no affidavit to sign, and no payment held back at the closing table.
The federal mechanics still govern the exchange itself: a qualified intermediary must hold your sale proceeds, and the 45-day and 180-day deadlines apply. A qualified intermediary is the independent party that holds your sale proceeds during an exchange. WealthBuilder 1031 handles exchanges in Illinois and all 50 states.
Federal Taxes Still Apply
A Illinois exchange defers two layers: federal and state. Here is what a taxable sale looks like without an exchange, using round numbers.
Example: $1,000,000 sale of a Illinois rental. Original purchase $600,000, with $100,000 of depreciation taken, so the adjusted basis is $500,000 and the total gain is $500,000.
| Tax | Calculation | Amount |
|---|---|---|
| Federal depreciation recapture | $100,000 x 25% | $25,000 |
| Federal long-term capital gains | $400,000 x 20% | $80,000 |
| Net investment income tax | $500,000 x 3.8% | $19,000 |
| Illinois state income tax | $500,000 x 4.95% | $24,750 |
| Total potential tax | up to $148,750 |
Figures are illustrative and rounded. Your rates depend on income, filing status, and basis. A qualifying 1031 exchange may defer the entire amount. Run your own numbers with our 1031 exchange calculators, then confirm them with your tax advisor.
Risks and Things That Go Wrong in Illinois Exchanges
- Assuming no withholding means no state tax. Illinois taxes recognized gain on your return; closing without withholding is a convenience, not an exemption.
- Boot surprises. Cash taken at closing or mortgage relief not offset with new debt or additional cash becomes recognized gain — taxable federally and in Illinois now, not later.
- Failed deadlines. The federal 45-day identification and 180-day completion rules apply with no state extensions. See the IRS rules for 1031 exchanges.
- Deferral is not elimination. The IRS and Illinois will tax the deferred gain when you eventually cash out. Plan the exit, not just the exchange.
Illinois 1031 Exchange FAQs
Does Illinois withhold tax when I sell investment property?
No. Illinois has no nonresident real estate withholding at closing and no exemption form to file.
Can I exchange my Illinois property for property in another state?
Yes. Replacement property can be anywhere in the U.S., and Illinois does not claw back or track the deferred gain afterward.
Do I still need a qualified intermediary in Illinois?
Yes. The QI requirement is federal — your sale proceeds must be held by an independent intermediary, not by you, in every state.
Does Illinois track my deferred gain after the exchange?
No. Illinois has no claw-back rule and no annual reporting tied to deferred exchange gain.
Sources
- Tax Foundation, State Individual Income Tax Rates and Brackets, 2026
- Federation of Exchange Accommodators, state withholding survey
Want to learn more? Our 1031 exchange guide covers the full process from sale to replacement. Ready to start a Illinois exchange? WealthBuilder 1031 is attorney-owned, serves all 50 states, and charges a flat $1,000 fee. Start at WealthBuilder1031.com or call 888-508-1901.
This page does not constitute legal or tax advice. Consult your attorney and tax advisor about your specific situation.
Ready to start your Illinois 1031 exchange? WealthBuilder 1031 acts as your qualified intermediary for a flat $1,000 fee, $750 at your sale and $250 at your purchase. See our Illinois 1031 exchange services to get started.
Have Questions?
Chat with one of our team members to see if a 1031 Exchange is right for you, (without committing to anything).
Video Resources
Case Studies
Get Started Today
It is easy to get started on your exchange. You can either call our office directly at 888-508-1901, or you can fill out our Start Your Exchange form.
Start Your Exchange
Disclaimer: This content is for informational purposes only and does not constitute legal or tax advice. Consult your tax advisor or attorney for advice specific to your situation.