Exchange Guide
The 45-Day Identification Period
How the federal 45-day identification window works in an Illinois 1031 exchange, including the three-property, 200-percent, and 95-percent rules.
Every deferred exchange under Section 1031 runs on a clock that starts the moment the relinquished property closes, and the first deadline on that clock is the 45-day identification period. Within those 45 calendar days, an Illinois investor selling anything from a Naperville office building to a downstate grain elevator has to put in writing which replacement properties they intend to pursue. There is no extension for weekends, holidays, or a slow week of showings in Chicagoland or the Peoria market. Missing the window does not just narrow the options, it ends the exchange and converts the sale into a fully taxable event.
01
When the Clock Actually Starts
The 45 days begin on the date the relinquished property transfers, not on the date the seller decides an exchange might make sense. For an Illinois investor closing a sale in Rockford or the south suburbs of Chicago, that closing date is the trigger, and the qualified intermediary holding the proceeds should already be lined up before that date arrives. Investors who wait until after closing to start thinking about replacements are effectively shortening their own window, since diligence, broker calls, and site visits across Illinois submarkets all eat into the same 45 days.
02
The Three Property Rule
Most exchangers use the three-property rule, which allows identification of up to three replacement properties regardless of their combined value. This is the simplest path for an Illinois investor moving from one Cook County multifamily building into a similar asset, since it does not require any value math, only a clear written list naming candidates the intermediary and the investor both agree on. The tradeoff is flexibility: three named properties is a short list if one falls out of contract during the 180-day closing period that follows.
03
The 200-Percent and 95-Percent Rules
An investor who wants more than three candidates can use the 200-percent rule, identifying any number of properties as long as their combined fair market value does not exceed twice the sale price of the relinquished Illinois property. This suits an exchanger comparing options across separate submarkets, such as a Chicagoland industrial building against a Springfield warehouse, without being boxed into three names. If the identified list exceeds 200 percent of the relinquished value, the 95-percent rule becomes the fallback: the exchanger must actually acquire at least 95 percent of the value of everything identified, a standard few investors meet and one that generally signals the list was built too loosely in the first place.
04
What a Valid Identification Notice Requires
The notice has to unambiguously describe each property, typically by street address or legal description, and it has to be signed and delivered to the qualified intermediary or another party permitted under the regulations before midnight on day 45. A verbal mention to a broker or an email that only references a neighborhood does not satisfy the rule. Illinois exchangers working across county lines, say identifying a Champaign property and a DuPage County property on the same list, should confirm each address is specific enough that a third party reading the notice could locate the parcel without guessing.
For a property still under construction or one lacking a formal street address, a legal description pulled from the title commitment usually satisfies the standard, though it should be confirmed with the intermediary rather than assumed. Multi-parcel Illinois deals, such as an assemblage of adjoining downstate farm tracts, sometimes need each parcel listed separately even when they will close as a single purchase, since the identification rule looks at each legal parcel rather than the deal as a package.
05
Revising the List Before the Deadline
Nothing locks in until day 45 passes. An investor can add, remove, or swap identified properties as many times as needed while the window is still open, which matters when a Chicago-area candidate falls through on financing or a downstate seller changes terms mid-negotiation. Coordinating those revisions with the qualified intermediary in qualified intermediary coordination keeps the paper trail clean, and pairing early identification work with 45-day identification strategy support gives an Illinois exchanger a working shortlist well before the clock gets tight.
Questions
Common questions
Does the 45-day period include weekends and holidays?
Yes, it is 45 calendar days from the closing date with no adjustment for weekends or federal holidays, so the actual deadline can land on a non-business day.
Can an Illinois investor identify a replacement property outside Illinois?
Yes, like-kind real property rules do not require the replacement to sit in the same state, though staying within familiar Illinois submarkets often simplifies diligence and local tax exposure.
What happens if no property is identified within 45 days?
The exchange fails, the qualified intermediary returns the proceeds, and the sale is taxed as if no exchange had been attempted.
Can identified properties be replaced with different ones later in the window?
Yes, the list can be revised any number of times up until day 45, after which it is final regardless of what happens afterward.
Is a text message or phone call to a broker enough to identify a property?
No, the identification has to be a written, signed notice delivered to the qualified intermediary or another qualifying party, not an informal conversation.
How many properties can be identified under the 200-percent rule?
There is no cap on the number of properties, only a cap on their combined value, which cannot exceed twice the sale price of the relinquished property.
Ready to see how the 45-day identification period fits your Illinois 1031 exchange? Talk through the timeline, replacement options, and documentation before the identification clock starts.
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