The direct answer: you have 45 calendar days from the day you close the sale of your property to deliver a written, signed identification of replacement property to your qualified intermediary — weekends and holidays included, with no extensions for either.1,2 Miss it, and the exchange generally fails. This guide covers how the clock runs, the three identification rules, what a valid identification looks like, and what investors on the clock may still be able to do.
The identification period begins on the day you transfer the relinquished property — in practice, the closing date — and ends at midnight on the 45th calendar day after it.2 Three features of that sentence do the damage:
Calendar days, not business days. Weekends count. Holidays count. If day 45 lands on Thanksgiving, the deadline is midnight on Thanksgiving. Unlike many tax deadlines, the identification period does not roll to the next business day.2
The clock starts at closing, not at your decision to exchange. Investors sometimes mentally start the clock when they engage a qualified intermediary or when sale proceeds arrive. The regulation starts it at the transfer. If you spent two weeks after closing deciding whether to exchange at all, those weeks are gone.
It runs inside the 180-day exchange period. The full exchange must be completed by the earlier of 180 days after the transfer or the due date of your tax return for the year of the sale, including extensions.1 A sale that closes late in the year can produce an exchange period materially shorter than 180 days unless the return is extended — a detail worth raising with your tax advisor early.
The regulations limit how many replacement properties you may identify. You need to satisfy only one of the three rules — and which one you plan around shapes your whole search.3
Identify up to three properties, of any value, and you may acquire any one or more of them. This is the rule most exchanges use, because it is simple and the values are unlimited.
Three properties means three — a duplex and the lot behind it may count as two identifications, depending on how they are legally described. Fractional interests count: a 25% interest in a Delaware Statutory Trust holding one property is generally one identified property.
Are all three of your identifications genuinely closable — under contract, financeable, and diligence-complete-able inside the remaining 135 days? A list of three where two are long shots is really a list of one.
Identify any number of properties, as long as their combined fair market value does not exceed 200% of what you sold for. Useful when you are dividing proceeds across several smaller assets or several DST interests.
The 200% test is aggregate fair market value at the end of the identification period — not your intended purchase amounts. Identifying five properties “just in case” can quietly blow through the cap and invalidate the entire identification unless the 95% exception saves it.
Has anyone added up the list? We have seen identification letters where no one — not the investor, not the agent — had totaled the fair market values against the cap before signing.
Exceed both rules — more than three properties and more than 200% of value — and the identification can still stand, but only if you actually acquire at least 95% of the total value you identified.
Acquiring 95% of everything you listed is rarely realistic for individual investors; in practice this exception functions as a trap sprung on over-long lists rather than a strategy chosen on purpose.
If your list needs the 95% exception, the question is usually not “how do we comply” but “why is the list this long” — shortening it before day 45 may be the cleaner path.
The regulation is specific, and each requirement is a place identifications fail:2
In writing. A phone call to your intermediary is not an identification. Neither is an email you drafted and never sent. Most qualified intermediaries provide an identification form; use it.
Signed by you. The taxpayer doing the exchange signs — and for property held in an entity or trust, the signer should match how title is held. Mismatches between the selling entity and the identifying signer invite challenge.
Unambiguous description. A street address or legal description for real property. “A DST to be selected from Sponsor X’s current offerings” is not unambiguous; an interest in a named trust holding a described property is. For DST identifications, the convention is to name the trust and, where practical, the approximate percentage interest — your intermediary and tax advisor should review the exact wording.
Delivered before midnight of day 45 to a party to the exchange who is not you and not disqualified — in practice, the qualified intermediary. Hand delivery, mail, fax, or the method your exchange agreement specifies. Delivery to your own real estate agent, attorney, or accountant generally does not satisfy the rule.2
One quiet mercy in the regulation: replacement property actually received within the 45 days is treated as identified.2 If you close on the replacement in week five, the paperwork race is over.
Identifications are not engraved until midnight of day 45. Before then, you may revoke an identification — in writing, signed, delivered to the same party — and identify something else.2 Investors under contract on a replacement that begins to wobble in week five should remember this: the list can be rebuilt right up to the deadline. After it, the list is the list; you may acquire only what is on it.
Hypothetical illustration — dates and figures are invented to show the mechanics
An investor closes the sale of a rental fourplex on Friday, March 6. Counting March 7 as day one:
The pattern to copy is not the specific properties; it is that the list was finished with room to spare and included a leg that could close on paper alone.
The failure modes we see are rarely exotic:
Nothing in the regulation requires you to acquire everything you identify — under the three-property rule you may identify three and buy one.3 That asymmetry is the margin of safety, and investors may be able to use it deliberately:
Identify a closable backup. Some investors use their second or third identification slot for an option that can close quickly and does not depend on a seller’s cooperation — for accredited investors, an interest in a Delaware Statutory Trust is one such option, because the asset is already owned by the trust and closing is largely paperwork. Whether a DST is appropriate depends on your circumstances; DST interests are speculative, illiquid investments available to accredited investors only, and they carry their own fees and risks, which we cover plainly in DST Fees, Honestly.
Mind the deadline’s shadow on price. A seller who knows you are in an exchange in week five knows your alternatives are shrinking. A finished identification list is also a negotiating position.
Use the calculator. Our 1031 deadline calculator turns a closing date into both deadlines instantly — and prints a one-page calendar.
If no valid identification exists at midnight of day 45 and no replacement was received inside the window, the transaction generally ceases to qualify as an exchange: the intermediary returns the proceeds in due course and the sale is taxable in the ordinary way — capital gains and depreciation recapture included.1,4 There is no cure, no late filing, no administrative mercy for a missed identification.
The narrow exception: when a federally declared disaster affects the exchange, IRS guidance may postpone deadlines that fall within the covered period — commonly by 120 days, subject to the specific declaration and qualifications.5 It applies when the government declares a disaster, not when a deal does.
A failed exchange is a tax event, not always a catastrophe — and investors who see day 45 approaching without a workable list are often better served planning the tax outcome deliberately than identifying something unbuyable to keep hope alive. That is a conversation for your tax advisor, early.
Contact our team to discuss whether a 1031 exchange may be appropriate for your circumstances.
This guide is educational and is not tax or legal advice; consult your own tax and legal advisors about your specific situation. Qualified investors seeking to defer taxes through a 1031 exchange may be able to do so under current law; not all investors will be able to utilize these benefits. Tax laws are subject to change and future legislation could affect the availability or benefits of Section 1031 exchanges and basis step-up provisions. Section 1031 exchanges defer — they do not eliminate — capital gains and depreciation recapture taxes. Investments discussed may be speculative, illiquid, and involve a high degree of risk, including the possible loss of principal. Such investments are generally available only to qualified or accredited investors. Securities are offered through Realta Equities, Inc., Member FINRA/SIPC, and investment advisory services are offered through Realta Investment Advisors, Inc., co-located at 1201 N. Orange Street, Suite 729, Wilmington, DE 19801. Neither Realta Equities, Inc. nor Realta Investment Advisors, Inc. is affiliated with Carmona Wealth.
