The 45-Day and 180-Day Rules for a 1031 Exchange
Important: In a typical delayed 1031 exchange, replacement property must be identified in a signed written document within 45 days after the relinquished property is transferred. The replacement property must then be received by the earlier of 180 days after that transfer or the due date, including extensions, of the federal tax return for the transfer year.
The Exchange Calendar
Milestone | General Timing | Reader Action |
Before the sale closes | Set up the exchange | Engage the qualified intermediary and confirm the transfer date |
Identification | By the end of day 45 | Deliver a signed, unambiguous written identification to an eligible recipient |
Milestone | General Timing | Reader Action |
Acquisition | By the applicable day 180 deadline | Complete financing, title, inspections, and the replacement closing |
Tax-return | May shorten the exchange period | Coordinate any return extension before filing |
Try the interactive tool: Enter the relinquished-property transfer date to calculate the general day-45 identification date and day-180 completion date.
The strongest approach is to plan before the relinquished property closes. Investors who wait until day 30 to begin a serious replacement-property search have much less room for financing delays, failed inspections, title issues, or a seller who changes direction.
When does the 45-day period begin?
The identification period starts on the date the relinquished property is transferred. Day 1 is the day after the transfer date, and the replacement property must be properly identified no later than the end of day 45. The deadline is based on calendar days, not business days.
If several relinquished properties are part of the same exchange and transfer on different dates, the identification and exchange periods generally begin on the date of the earliest transfer. The closing team should document the controlling date and calculate both deadlines in writing.
What makes an identification valid?
The identification must be in a signed written document. It must clearly describe the replacement property and be delivered by the deadline to the person obligated to transfer the replacement property or another eligible person involved in the exchange. The investor and a disqualified person cannot be the only recipients.
Use a street address, legal description, or another unambiguous description for real property.
Follow the qualified intermediary's delivery instructions and retain evidence of timely delivery.
Do not rely on an informal conversation, private spreadsheet, or unsigned email draft.
If an identification is revoked or changed, complete the change in writing before the 45-day period ends.
How many properties can be identified?
Investors often identify more than one property because a preferred deal can fail. The federal rules permit alternatives, but the list must stay within an allowed identification method.
Three-property rule: Identify no more than three properties, regardless of their combined value.
200% rule: Identify any number of properties if their combined fair market value does not exceed 200% of the total fair market value of all relinquished properties on the transfer date.
95% exception: If the other limits are exceeded, the identification may still work when the investor receives at least
Practical caution: The 95% exception is difficult to use because it generally requires acquiring nearly everything identified. It should not be treated as a routine backup plan.
How the 180-day deadline works
The exchange period ends on the earlier of two dates: day 180 after the relinquished property is transferred, or the due date, including extensions, for the federal income tax return for the year of transfer. The 180 days include the first 45 days; they are not added together.
A late-year sale deserves special attention. If the normal tax-return deadline arrives before day 180, a timely return extension may be needed to preserve the full exchange period. Filing the return early can also end the available exchange period, so the return-preparation team should know the transaction schedule.
A sample exchange calendar
Illustrative timeline: Assume the relinquished property transfers on September 10. The 45-day identification period ends on October 25, and day 180 falls on March 9 of the following year. Because an individual return is normally due after March 9, the 180-day date would generally control. Exact dates should always be confirmed for the taxpayer and year involved.
The same calendar should be shared with the investor, qualified intermediary, real estate broker, lender, attorney, and tax advisor. Each person manages a different risk, and no single professional controls the entire closing process.
What if the preferred property falls through?
An investor may acquire any replacement property that was validly identified and that satisfies the exchange requirements. This is why backup properties can be useful. A property that was never properly identified generally cannot be substituted after the 45-day window closes.
The replacement property received must be substantially the same property that was identified. Material changes, parcel substitutions, ownership changes, or construction differences can require technical review.
Deadline mistakes that can break an exchange
Starting the property search only after the relinquished closing
Assuming the deadlines count business days
Sending an identification to the wrong person
Using a vague description or failing to sign the identification
Listing too many properties without meeting an identification rule
Forgetting that the federal return due date may arrive before day 180
Changing the identified property after day 45
Expecting the qualified intermediary to evaluate the tax or investment quality of a property
A better pre-closing timeline
Two to eight weeks before closing: Estimate tax exposure, choose advisors, interview qualified intermediaries, and begin replacement-property research.
Before the sale closes: Sign the exchange documents, confirm the flow of funds, and record the exact deadline dates.
Days 1 to 30: Complete property underwriting, site visits, financing discussions, and initial due diligence.
Before day 45: Submit a precise written identification with realistic backup options and retain proof of delivery.
Days 46 to 180: Finish inspections, financing, title work, and closing while keeping the tax-return deadline in view.
Frequently asked questions
Are the 45-day and 180-day periods business days?
No. They are calendar-day periods, including weekends and holidays, subject to limited relief rules that may apply in specific federally declared disasters.
Can the 45-day identification period be extended?
Ordinary transaction delays do not provide an automatic extension. Limited relief may be available under specific IRS disaster guidance.
Can I change my identification after day 45?
Generally, no. A change or revocation should be completed in writing before the identification period ends.
Can I identify more than three properties?
Yes, if the identification satisfies the 200% rule or the narrow 95% exception.
Does the 180-day period start after day 45?
No. Both periods start from the transfer of the relinquished property, so the first 45 days are included in the 180 days.
Important: This article provides general educational information about U.S. federal tax rules as reviewed in August 2026. It is not tax, legal, real estate, or investment advice. Eligibility and tax results depend on the transaction, ownership, use, timing, financing, and state law. Consult qualified advisors before signing or closing a sale.
Don't Let a Deadline Derail Your 1031 Exchange
A 1031 exchange leaves little room for timing mistakes. Taxulo can help you understand the 45-day and 180-day requirements, plan your exchange before the sale closes, and coordinate the tax strategy around your transaction so you can move forward with a clear timeline.
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