A 1031 exchange is one of the most powerful tools in commercial real estate — and one of the most time-sensitive. Understanding the rules isn't just useful for investors. For brokers, knowing exactly how the exchange works is how you turn a seller into a buyer before anyone else does.
What is a 1031 exchange?
A 1031 exchange — named after Section 1031 of the Internal Revenue Code — allows a property owner to defer capital gains taxes when they sell an investment property, as long as they reinvest the proceeds into a "like-kind" replacement property within the required timeframes.
The deferral is not a forgiveness. The tax obligation transfers to the replacement property and is only triggered when that property is eventually sold without a subsequent exchange. Investors who do consecutive exchanges can defer gains indefinitely.
The two critical deadlines
Both deadlines start the day you close on the relinquished (sold) property. There are no extensions, no exceptions, and no negotiation with the IRS.
45-day identification deadline
Within 45 days of closing, you must identify potential replacement properties in writing to your qualified intermediary. The identification must be in writing, signed, and delivered to a party involved in the exchange (typically the QI).
You can identify up to three properties regardless of value (the "3-property rule"), or any number of properties whose combined value does not exceed 200% of the relinquished property's value (the "200% rule"). In practice, most exchangors use the 3-property rule.
180-day exchange deadline
You must close on the replacement property within 180 days of the relinquished property closing — or by the due date of your tax return for the year of the sale, whichever is earlier. If your tax return is due before 180 days, you can file an extension to preserve the full 180-day window.
The 180-day clock runs concurrently with the 45-day identification clock — you are not given 45 days plus 180 days. You have 180 total days, and identification must happen within the first 45 of those.
Use the 1031 deadline calculator to get exact dates for any sale close date.
What qualifies as like-kind property?
For real property, "like-kind" is interpreted broadly. Any real property held for investment or business purposes can be exchanged for any other real property held for investment or business purposes — regardless of property type. A retail building can be exchanged for an apartment building, raw land, an industrial facility, or another retail property.
The key requirements:
- Both properties must be held for investment or used in a trade or business (not personal use)
- Both properties must be located in the United States
- The exchange must be facilitated by a qualified intermediary
The qualified intermediary requirement
You cannot touch the proceeds. A qualified intermediary (QI) — also called an exchange accommodator — must hold the proceeds from the sale and transfer them directly to the replacement property at closing.
If you receive the funds at any point, the exchange is disqualified and the full gain becomes taxable. The QI must be engaged before the sale closes — you cannot bring one in after the fact.
Boot and partial exchanges
If the replacement property is worth less than the relinquished property, or if you receive any cash or non-like-kind property in the transaction, the difference is called "boot" and is taxable in the year of the exchange.
Common sources of boot:
- Cash received because the replacement property purchase price is lower
- Mortgage reduction (taking on less debt on the replacement property than existed on the relinquished property)
- Non-like-kind property received
Brokers should note: commission paid from exchange proceeds does not typically constitute boot, but this depends on the specific structure of the transaction.
Reverse exchanges and construction exchanges
Two exchange structures allow more flexibility at significantly higher complexity and cost:
Reverse exchange: The replacement property is acquired before the relinquished property is sold. An exchange accommodation titleholder (EAT) holds title to one of the properties during the exchange. The same 45-day and 180-day deadlines apply, running from the acquisition of the replacement property.
Construction (improvement) exchange: Allows exchange proceeds to be used to build improvements on the replacement property. The improved property must be received within 180 days and must be of equal or greater value to the relinquished property. Often combined with a reverse exchange structure.
The broker opportunity: identifying 1031 buyers before they commit
This is where the rules create a prospecting edge.
When a commercial property owner closes a sale, they enter the 45-day identification window. During this window — especially days 0 through 35 — they are motivated to identify replacement properties at a pace they may not be under normal market conditions. If day 40 arrives and they haven't identified, they are willing to consider properties they might have passed on a week earlier.
The challenge for brokers has been knowing who is in this window. ACRIS deed transfer data tells you when a commercial property sold. Combine that with hold period, estimated equity, and depreciation schedule — and you can identify who is likely in a 1031 window with reasonable confidence.
Station CRM does this automatically for NYC retail properties. Every week, it surfaces a scored list of commercial property sellers who are likely 1031 exchange buyers — with enough timing data to know whether they're in the early identification phase or approaching deadline urgency.
See how 1031 buyer intelligence works →
Common 1031 exchange mistakes
Missing the identification deadline: The 45-day clock is absolute. No extensions for personal emergencies, market conditions, or inability to find suitable properties.
Identifying but not closing: Identifying a property within 45 days does not guarantee you will close within 180 days. Deal delays, financing issues, or seller problems can kill the exchange. Identify backup properties whenever possible.
Using exchange funds for non-exchange expenses: Repair costs, renovation costs, and due diligence expenses paid from exchange funds can create taxable boot. Work with your QI to understand what can and cannot be paid from exchange proceeds.
Choosing the wrong QI: QI failure — including insolvency — has cost exchangors their entire deferred gains. Use a QI with adequate insurance and bonding, and consider keeping exchange funds in a segregated FDIC-insured account.
Related-party transactions: Exchanging with a related party (family members, entities with common ownership) triggers additional rules. The related-party rules can cause disqualification if either party sells within two years of the exchange.
Key terms
Relinquished property: The property being sold.
Replacement property: The property being acquired.
Qualified intermediary (QI): The independent party who holds exchange proceeds and facilitates the transfer.
Boot: Any non-like-kind property or cash received in the exchange — taxable in the year of the exchange.
Like-kind: Any real property for real property held for investment or business purposes.
200% rule: An identification rule allowing identification of any number of properties whose combined FMV does not exceed 200% of the relinquished property's value.
3-property rule: The most common identification rule — identify up to three properties regardless of value.
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