A 1031 exchange lets an investor sell investment real estate and defer capital gains tax by rolling the proceeds into like-kind replacement property. The deferral comes with two hard deadlines. From the day the sale closes, the investor has 45 calendar days to identify replacement property in writing to a qualified intermediary, and 180 calendar days to complete the purchase. The two periods run at the same time, not back to back.
Net lease properties, single-tenant buildings where the tenant covers most or all operating costs, are common replacement targets, largely because they can be underwritten quickly and owned passively. This guide covers the full exchange timeline: how the deadlines work, what the identification rules require, what a qualified intermediary does, and how disciplined investors and their brokers sequence the process so the clock never forces a bad acquisition. It is educational only, not tax advice. A qualified intermediary and a tax advisor should confirm how the rules apply to any specific transaction.
What a 1031 exchange is
Section 1031 of the Internal Revenue Code allows an owner of investment or business-use real estate to defer capital gains tax when the property is exchanged for like-kind real estate. For real property, like-kind is read broadly. A distribution warehouse can be exchanged for a pharmacy, raw land for a medical office building. What matters is that both the property sold and the property acquired are held for investment or productive use in a trade or business, not for personal use or quick resale.
The tax is deferred, not eliminated. The investor's cost basis carries into the replacement property, and the deferred gain comes due when the replacement is eventually sold outside another exchange. Many investors exchange repeatedly, moving from one asset to the next over decades. Because the seller can never take possession of the sale proceeds along the way, the structure depends on an independent third party, the qualified intermediary, from the very start.
The 45-day and 180-day deadlines
Two clocks start on the day the relinquished property closes. The first gives the investor 45 calendar days to identify replacement property, in writing, delivered to the qualified intermediary. The second gives the investor 180 calendar days to complete the acquisition. Both periods are measured from the same closing date. The 180 days is the total runway, not an additional period that begins after identification.
The practical consequence is simple. Every day spent deciding what to buy is a day no longer available to close on it. An investor who identifies on the final day has only the remainder of the 180-day period to finish diligence, secure financing, and fund the purchase. The counts are calendar days, so weekends and holidays are included. A deadline that lands on a Sunday is still the deadline.
Identification rules in plain English
Identification is a formal act, not a mental note. It must be in writing, signed by the investor, and delivered to the qualified intermediary before the 45-day window closes. The description must be unambiguous, which in practice means a street address or legal description. A drive-through restaurant somewhere in the Southeast does not identify anything. A specific address does.
The IRS also limits how much can be identified. The limits work in two general ways: one caps the number of properties on the list, the other caps the combined value of a longer list relative to the property sold. Which approach fits depends on the investor's plan, and a qualified intermediary can confirm the specific limits before the list is finalized. Within the window, the list can be revised or replaced. After day 45 it is locked, and the exchange can only be completed with property on the list.
The qualified intermediary's role
A qualified intermediary, sometimes called an exchange accommodator, is the independent party that makes a deferred exchange work. The intermediary holds the sale proceeds between the two closings, receives the written identification, prepares the exchange documentation, and wires the funds to the replacement closing. If the investor takes receipt of the proceeds at any point, even briefly, the exchange generally fails and the gain becomes taxable.
The intermediary must be in place before the relinquished property closes. This is a common stumble: a sale closes, the proceeds land in the seller's account, and the exchange is dead before it began. Because the intermediary holds the full sale proceeds, selection deserves real diligence. Financial controls, segregated accounts, and an established track record matter more than fee differences. Close advisors such as the investor's own attorney or accountant are generally not eligible to serve, because the role must be independent of the taxpayer.
Why net lease assets fit the exchange clock
Net lease properties are a natural fit for exchange buyers. Under a triple net (NNN) structure, the tenant typically pays property taxes, insurance, and maintenance, leaving the owner with little day-to-day responsibility. Investors exchanging out of management-intensive assets, such as apartments or multi-tenant retail, often use a 1031 to trade operational work for passive income without giving up real estate ownership.
The asset class also suits the calendar. Underwriting a single-tenant net lease deal centers on a contained set of questions: the lease terms, the tenant's credit, the rent relative to market, and the real estate itself. Long lease terms and contractual rent make the income stream predictable, so a credible buy decision can be reached inside a 45-day window. And because net lease inventory is marketed nationally across a wide range of price points and tenant types, building an identification list of genuine candidates, including backups, is realistic in a way it may not be for rarer asset types.
Sequencing the sale and the search
The deadlines start at closing, but the search should not. Disciplined exchangers begin evaluating replacement property when the relinquished asset goes under contract, and often earlier. The contract-to-close period on the sale functions as a free extension of the identification window: every week of escrow spent reviewing replacement deals is a week the 45-day clock never has to absorb.
Timing levers on the sale side matter as much as speed on the buy side. The closing date of the relinquished property is negotiable, and aligning it with the availability of replacement deals is often more valuable than closing fast. The strongest position is to have a replacement property under contract, or at least in advanced negotiation, before day one of the exchange period, with backups identified in case diligence turns up a problem. Investors who need to acquire before they sell can ask a qualified intermediary about a reverse exchange, a more complex structure in which the replacement is held by an accommodator until the relinquished sale closes.
A broker handling the sale of a relinquished property is also, in effect, managing the front end of an exchange, and the work changes at each stage.
- Before listing
- Confirm a qualified intermediary is engaged before the sale closes, understand the investor's replacement criteria, and begin previewing candidate inventory.
- During the sale
- Run the replacement search in parallel with marketing, and structure the sale's closing date and extension rights around the exchange plan.
- Days 1 through 45
- Deliver a vetted identification list early, push the primary target toward contract, and confirm written identification reaches the intermediary before the deadline.
- Days 46 through 180
- Drive diligence and financing on the replacement, keep the lender on schedule, and protect contractual extension rights in case the closing slips.
Where exchange timelines fail
Exchanges that fail often do so on the calendar rather than on the merits. The pressure is also visible to the other side of the table: a seller who knows a buyer is approaching day 45 has little reason to negotiate. The recurring failure patterns are worth naming.
None of these failures is exotic, and all of them are avoidable with sequencing. Investors who complete clean exchanges treat the deadlines as confirmation dates for decisions already made, not as the period in which the decisions get made. A qualified intermediary and a tax advisor should be in the conversation before the relinquished property is even listed.
- Starting the search at closing
- Burning the first weeks of the identification window on orientation instead of decisions is a common mistake.
- Identifying a single property
- If diligence kills the only identified deal after day 45, the exchange has nowhere to go. Backups belong on the list.
- Engaging the intermediary late
- If the sale closes and the proceeds reach the seller directly, the exchange is generally over before it starts.
- Vague identification
- A description that does not unambiguously name a property may not count as identification at all.
- Back-half financing delays
- A lender engaged only after identification can consume the remaining period. Financing conversations should start during the sale escrow.
- Buying under duress
- An expiring window pushes investors toward overpriced or compromised assets. Deep preparation before the clock starts is the only reliable defense.
Frequently asked questions
How long do you have to complete a 1031 exchange?
An investor has 45 calendar days from the closing of the relinquished property to identify replacement property in writing to a qualified intermediary, and 180 calendar days from that same closing to complete the acquisition. Both deadlines run concurrently from the closing date. The counts are calendar days, so weekends and holidays are included.
Do the 45-day and 180-day deadlines run at the same time?
Yes. Both periods start on the day the relinquished property closes, and the 180-day completion period is not extended by time spent on identification. An investor who uses the full identification window has less of the total period left to close, which is why many exchangers try to identify well before day 45.
Why are net lease properties popular 1031 replacement targets?
Net lease properties typically combine long lease terms, predictable rental income, and limited landlord responsibilities, which makes them faster to underwrite than management-intensive assets. That speed matters inside a 45-day identification window. They also allow investors to exit active management while keeping real estate exposure.
What does a qualified intermediary do in a 1031 exchange?
A qualified intermediary is an independent third party who holds the sale proceeds between closings, receives the investor's written identification of replacement property, and documents the exchange so the investor never takes possession of the funds. The intermediary must be engaged before the relinquished property closes. If the investor receives the proceeds directly, the exchange generally fails.
Can the 45-day identification deadline be extended?
As a rule, no. The deadlines are counted in calendar days, include weekends and holidays, and do not move because a deal falls through or a lender is slow. Investors should plan as though no extension will be available and confirm with a tax advisor whether any exception applies to their situation.