1031 Exchange Rules and Deadlines
A 1031 exchange has a small number of rules and a set of unforgiving deadlines. Miss any of them and the exchange fails, the deferral is lost, and the gain becomes taxable in the year of sale. This page is the complete reference: the 45-day rule, the 180-day rule, the three identification rules, the same-taxpayer rule, the equal-or-greater-value rules, and the boot rules. Plain language, with what happens when each one is missed.
The Two Statutory Deadlines
A 1031 exchange has two statutory deadlines that drive everything. Both are set by Section 1031 of the Internal Revenue Code, and both are inflexible. Both clocks start the day your relinquished property closes (Day 0).
- Day 45 (45-Day Identification Rule): Replacement property must be identified in writing, signed, and delivered to your qualified intermediary within 45 calendar days of Day 0. After Day 45, the identification list is final.
- Day 180 (180-Day Closing Rule): Replacement property must be acquired (closed) within 180 calendar days of Day 0, or by the due date of your tax return for the year of sale (whichever is earlier).
Both deadlines are calendar days, not business days. They include weekends and holidays. Falling on a Saturday, a federal holiday, or a Tuesday makes no difference. Day 45 is Day 45 and Day 180 is Day 180.
There are narrow exceptions in IRS-declared disaster areas (covered later on this page), but barring formal IRS relief, these dates are immovable.
The 45-Day Identification Rule
Within 45 calendar days of Day 0, you must identify your replacement property in writing, signed, and delivered to your qualified intermediary (QI). After Day 45, the identification list is final and cannot be changed. You can only close on properties that appear on the list.
How identification has to be made
- In writing. Verbal identification doesn’t satisfy the rule. Texts, emails, and phone calls don’t satisfy it either, in the strict sense. Use a formal identification letter.
- Signed. By you, the taxpayer.
- Delivered to the QI. Not to your CPA, not to your attorney, not to the seller of the replacement property. The QI is the only legally valid recipient.
- By Day 45. Counted as 45 calendar days from the closing date of the relinquished property, including weekends and holidays. Day 0 is the closing date itself; Day 1 is the day after.
How specific the identification has to be
The IRS requires “unambiguous identification” of the replacement property. For real estate, this typically means a complete street address. For a DST, the trust’s full legal name is generally sufficient. Vague identifications (“a multifamily property in Phoenix”) are not enough.
What happens if you miss Day 45
The exchange is disqualified. The proceeds held by the QI are distributed to you (typically on Day 46 or shortly after), and the sale is treated as a fully taxable sale in the year of closing. There is no “oops, the package was delayed” remedy. There is no extension for personal hardship, family emergencies, or natural disasters (except in IRS-declared disaster areas under Rev. Proc. 2018-58 or specific disaster-relief notices).
The Three Identification Rules
When you submit your identification by Day 45, the IRS gives you three different ways to structure the list. You pick one. You can identify multiple properties under any of the three rules, but the math has to work for whichever rule you’ve chosen.
The Three-Property Rule
Identify up to three properties of any value. This is the most commonly used rule, and the simplest. It works regardless of the relinquished property’s value or the replacement properties’ combined value.
Example: you sold a $2M property. You can identify three replacement properties at $1.5M, $2M, and $4M, even though their combined value is way over $2M.
The 200% Rule
Identify any number of properties as long as their combined fair market value does not exceed 200% of the relinquished property’s value.
Example: you sold a $2M property. You can identify five, ten, or twenty replacement properties as long as their combined value stays at or below $4M (200% of $2M).
This is the rule DST 1031 investors use most often. With multiple DSTs and a direct property as backup, the combined identification can easily exceed three properties without exceeding 200% of value.
The 95% Rule
If you exceed both the three-property and 200% rules, you can still complete the exchange, but only if you actually close on at least 95% of the total identified value.
This is rarely used in practice. The 95% threshold is unforgiving: if you identify $10M of property and only close on $9.4M (94%), the entire exchange is disqualified. Most practitioners structure around the first two rules to avoid this risk.
Common identification structures
- Multifamily-focused exchange: identify three direct multifamily properties under the Three-Property Rule. Close on the strongest contender.
- DST-focused exchange: identify two or three DSTs and a direct property as backup, structured under the 200% Rule.
- Diversified DST exchange: identify five or six DSTs across asset classes and a direct property as backup, structured under the 200% Rule. Common for larger ($1M+) exchanges.
The 180-Day Closing Rule
Within 180 calendar days of Day 0, you must close on your replacement property. Closing means the deed transfers (for direct property), or the beneficial interest is recorded in the trust’s books (for a DST), and the QI wires the funds. From the IRS’s perspective, the exchange is complete when both legs of the transaction have been completed.
The earlier-of rule that surprises people
180 days is the maximum window, not always your actual deadline. Section 1031 requires the closing to happen by the earlier of:
- Day 180 from the relinquished sale, OR
- The due date of your tax return for the year of the sale (including extensions)
For most calendar-year individual taxpayers selling between January and June, this isn’t an issue. Day 180 falls before April 15 of the following year. For sales in late October, November, or December, the tax return due date can come before Day 180. If the relinquished property sold on December 1, your tax return is due April 15 of the next year (Day 135 of the exchange), which is before Day 180.
The fix is straightforward: file an extension. A timely-filed Form 4868 pushes the personal tax return due date to October 15, which restores the full 180-day window. Talk to your CPA about whether an extension is needed for your specific timeline.
What happens if you miss Day 180
Same outcome as missing Day 45. The exchange is disqualified, proceeds are distributed to you, and the sale becomes taxable in the year it closed. There is no extension except in IRS-declared disaster areas.
The Same-Taxpayer Rule
The taxpayer who sells the relinquished property must be the taxpayer who acquires the replacement. The IRS uses the term “taxpayer identity” to mean the legal entity (or natural person) listed as the seller of record on the relinquished closing must match the buyer of record on the replacement closing.
How this looks in practice
- Property held individually: If your name is on title, your name acquires the replacement.
- Property held in an LLC: The LLC sells, the LLC buys.
- Property held jointly: Both joint owners must be on title to the replacement, in the same proportions.
- Property held in a revocable living trust: The trust sells, the trust buys. The IRS treats grantor trusts as disregarded entities for income tax purposes, so the trust is essentially treated as the underlying individual.
Disregarded entity exceptions
Single-member LLCs (taxed as disregarded entities), grantor trusts, and certain estate-tax-driven structures are treated by the IRS as the underlying individual or entity for tax purposes. This creates some flexibility:
- You can sell property held individually and acquire replacement in a single-member LLC (the LLC is disregarded for tax purposes, so it’s still you).
- You can sell property held in a single-member LLC and acquire replacement individually (same reason).
- You generally cannot sell property held in a multi-member LLC and acquire replacement individually, because the multi-member LLC is treated as a partnership (a separate taxpayer).
Drop and swap
If a multi-member LLC wants to sell property and have the individual partners go their separate ways with their respective shares, the structure is sometimes restructured before the sale: the LLC distributes the property to the partners as tenants-in-common (the “drop”), and each partner then exchanges their TIC interest separately (the “swap”). The IRS scrutinizes drop-and-swap transactions for genuine investment intent, and timing matters. Talk to your CPA before attempting one.
Equal-or-Greater Value and Debt Rules
To fully defer the gain, the replacement property must equal or exceed the relinquished property in two specific dimensions: total value and total debt. Any shortfall in either dimension creates “boot,” which is taxable in the year of sale even if the rest of the exchange qualifies.
The value rule
The fair market value of the replacement property (or properties) must be at least as much as the net sale price of the relinquished property. “Net sale price” means gross sale price minus selling expenses (commissions, transfer taxes, etc.).
The debt rule
The replacement property’s debt must be at least as much as the relinquished property’s debt at closing. If you sold a property with $400,000 of mortgage debt, your replacement needs at least $400,000 of debt for full deferral. If the replacement has only $300,000 of debt, the $100,000 shortfall is treated as boot (“debt relief”).
How shortfalls create boot
The IRS treats two kinds of shortfalls as taxable boot:
- Cash boot: Cash received at closing or held back from the QI rather than reinvested. This is straightforward: any cash you actually receive is taxable.
- Debt-relief boot: If the replacement has less debt than the relinquished, the difference is treated as if you received cash equal to the debt relief. This is sometimes called “phantom boot” because no actual cash changes hands.
Example: you sell a property for $1M with $400K of debt and $600K of equity. To fully defer, your replacement needs $1M of total value and $400K of debt. If you buy a replacement with $1M of value but only $200K of debt (covering the gap with $800K of equity from the QI), you’ve created $200K of debt-relief boot. That $200K is taxable, even though you never received it as cash.
How DSTs simplify this
DST sponsors typically arrange non-recourse debt at the trust level at a target loan-to-value (often 50% or 55%). When you subscribe to the Delaware statutory trust, your pro-rata share of the trust’s debt becomes your replacement debt. If you bought $500K of beneficial interest in a DST with 50% LTV, your effective replacement debt is $500K (matching $500K of equity for $1M of total replacement). The math is computed at subscription, which is why our advisors model it for you before you sign.
The Boot Rules
“Boot” is the IRS term for any non-like-kind value you receive in the exchange. Boot is taxable in the year of the sale, even if the rest of the exchange qualifies for deferral. Most failed deferrals don’t fail the entire exchange. They fail only the portion that’s boot.
Common sources of boot
- Cash taken at closing: Most direct example. Any cash you withhold from the QI’s exchange account is taxable.
- Debt relief: Replacement debt less than relinquished debt creates phantom boot equal to the shortfall.
- Personal property in the exchange: If the relinquished sale included furnishings, equipment, or other non-real-property items in the contract, that portion of the sale price is boot.
- Excess cash held by the QI past Day 180: Any QI funds not used for replacement closing within the 180-day window are returned to you and taxed.
- Receipt of unlike-kind property in the exchange: Rare in practice, but if the replacement deal includes anything other than real property, that portion is boot.
Partial deferral is still deferral
Many real-world exchanges generate some amount of boot. The exchange is not “failed.” It’s partially deferred. The boot portion is recognized as gain in the year of sale (taxed at long-term capital gains rates plus depreciation recapture if applicable), and the rest of the gain stays deferred in the replacement property.
Example: $1M sale with $400K basis equals $600K gain. If $100K of boot is realized, that $100K is taxable, and the remaining $500K of gain remains deferred in the replacement. This is a common outcome and not a disaster, but the goal of careful planning is to minimize boot, not just “complete the exchange.”
Disaster-Area Relief and Other Narrow Exceptions
The 45-day and 180-day deadlines are statutory. They are not extended for personal hardship, illness, business disruption, or weather. There is one narrow class of exception: IRS-declared disaster relief.
How disaster relief works
When the IRS issues a disaster relief notice (typically following a Presidential disaster declaration for a hurricane, wildfire, or similar event), Rev. Proc. 2018-58 provides automatic extensions for taxpayers in the affected area. The extensions can include:
- Postponement of the 45-day identification deadline.
- Postponement of the 180-day closing deadline.
- Extension of the deadline for certain related tax-filing actions.
Eligibility depends on the taxpayer’s tax-home address (or the relinquished property’s location) being in the federally declared disaster area, and the relevant deadline falling within the relief period specified in the IRS notice. Most relief notices extend deadlines by 120 days from the original deadline date, or to the end of the relief period, whichever is later.
How to confirm if relief applies
If you’re in or near a federally declared disaster area and have a 1031 deadline approaching, check the IRS website’s “Tax Relief in Disaster Situations” page. Each declared disaster has its own notice listing the affected counties and the specific extensions provided. Your CPA should review the notice text rather than relying on summaries.
What’s not extended
Almost everything else. There is no extension for:
- COVID-related delays (most COVID-era extensions have expired).
- Personal medical emergencies.
- Sponsor delays (a DST sponsor missing a closing date doesn’t extend your Day 180).
- Bank wire delays unrelated to a federally declared disaster.
- Holiday closures (the deadlines are calendar days, not business days).
What Happens If You Miss a Deadline
Different rules have different failure modes. Here’s what each one looks like.
- Miss Day 45: Exchange is disqualified. QI distributes proceeds to you. Sale is fully taxable in the year of closing. Effectively the same outcome as never starting an exchange.
- Miss Day 180: Same outcome. Whatever portion of the proceeds was not used for replacement closing is distributed to you and taxed.
- Identification list violates the rules: If you identify too many properties under the Three-Property Rule, or your 200% list exceeds 200%, the IRS applies the 95% rule by default. If you fail the 95% threshold, the entire exchange is disqualified. Get this right at Day 45.
- Same-taxpayer mismatch: If the buyer of record on the replacement is a different taxpayer from the seller of the relinquished, the exchange is disqualified for that portion. Partial mismatches can disqualify portions of the exchange.
- Unequal value or debt: Doesn’t disqualify the exchange. Creates boot for the shortfall, which is taxable. The non-boot portion still defers.
- QI not engaged before relinquished closing: Exchange is disqualified. Proceeds touched the seller’s hands (even briefly) and the seller is treated as having received them.
- Property doesn’t qualify as like-kind: Exchange is disqualified or partial. If the relinquished property wasn’t held for investment or business use, no exchange is possible. If the replacement isn’t real property, that portion is boot.