Reverse 1031 Exchange Rules: Buy First, But Never in Your Own Name.
You can buy the replacement property before you sell the old one, but only if an exchange accommodation titleholder takes title instead of you. Rev. Proc. 2000-37 gives you 5 business days for the paperwork, 45 days to name what you are selling, and 180 days to finish.

A landlord finds the fourplex he has wanted for three years, and the seller wants to close in 30 days. His duplex is not listed yet. He has the cash to buy first and sell second, so he signs in his own name, closes, and calls me two weeks later to ask how to structure the 1031. That call is three weeks late. Reverse 1031 exchange rules let you buy the replacement property before you sell the old one, but somebody other than you has to take title on the day of the purchase.
Section 1031 needs an exchange, so somebody else holds one side.
Section 1031 defers gain only on an exchange, meaning a reciprocal transfer, and you cannot swap a property with yourself. That is why this is called a parking arrangement. Rev. Proc. 2000-37, 2000-2 C.B. 308, is the safe harbor: hold the property in a qualified exchange accommodation arrangement (a QEAA) and the IRS will treat the titleholder as the beneficial owner of the parked property for federal income tax purposes. Section 4.01(2) defines what it has to hold as qualified indicia of ownership: legal title, other indicia treated as beneficial ownership under commercial law, or interests in an entity disregarded as separate from its owner. That last option is why nearly every parking deal runs through a new single-member LLC.
Section 4.02(1) rules out you and any disqualified person under Treas. Reg. §1.1031(k)-1(k): your accountant, attorney, or broker, anyone else who has been your agent in the past two years, and anyone related to you under §267(b) or §707(b) with 10% substituted for 50%.
In a reverse 1031 exchange the 45 days identify what you are selling.
A forward exchange is not a useful model here: every deadline runs from the day the titleholder takes title, and no sale has happened yet. Section 4.02(3) gives you 5 business days after that transfer to sign a written qualified exchange accommodation agreement stating that the titleholder holds the property for your benefit to facilitate a §1031 exchange. Section 4.02(4) gives you 45 days from the same date to identify the relinquished property, in a manner consistent with the principles in Treas. Reg. §1.1031(k)-1(c), so the 3-property and 200% limits apply to what you intend to sell. Section 4.02(5) requires the parked property to reach you no later than 180 days after the titleholder took title, and section 4.02(6) caps the combined time both properties spend in the arrangement at 180 days. Calendar days, and nothing in the revenue procedure stretches for a slow buyer.
Which property gets parked decides who carries the risk: park the replacement, the usual structure, and the old one has to sell inside those 180 days. Park the relinquished property instead and you take the new one immediately, but section 4.02(5)(b) still requires the parked property to go within 180 days to somebody who is not you or a disqualified person, and you have to fund the purchase without the sale proceeds. Either way the statutory deadlines in IRC §1031(a)(3) run from the transfer of the relinquished property and end at the earlier of 180 days or your return due date including extensions. In practice the parking clock binds first.
Owning it first kills the safe harbor for that property.
Rev. Proc. 2004-51 added section 4.05, one sentence long: the safe harbor "does not apply to replacement property held in a QEAA if the property is owned by the taxpayer within the 180-day period ending on the date of transfer of qualified indicia of ownership of the property to an exchange accommodation titleholder." That has been the rule since July 20, 2004. So the landlord cannot hand a titleholder the fourplex he closed on three weeks ago and call it parked, and deeding it into a new LLC changes nothing, because a disregarded entity is still him. His gain on the duplex is taxable when it sells, and a forward exchange into a different property is what is left.
- Titleholder takes title to the fourplex
- March 3, 2026
- Accommodation agreement signed, 5 business days
- by March 10, 2026
- Duplex identified as the property to sell, day 45
- by April 17, 2026
- Both legs closed, day 180
- by August 30, 2026
- Duplex sale price
- $840,000
- Adjusted basis, $620,000 cost less $185,000 depreciation
- $435,000
- Realized gain
- $405,000
- Unrecaptured §1250 gain of $185,000 taxed at 25%
- $46,250
- Remaining $220,000 of long-term gain taxed at 20%
- $44,000
- Net investment income tax, 3.8% of $405,000
- $15,390
- Federal tax if the duplex is simply sold
- $105,640
- Federal tax deferred by the reverse exchange
- $105,640
- Basis in the fourplex after the exchange
- $745,000
Tax year 2026, married filing jointly. Assumes the duplex was held more than a year, that only straight-line depreciation was claimed so the $185,000 is unrecaptured §1250 gain taxed at a maximum of 25% under §1(h)(1)(E) rather than ordinary recapture, taxable income above the $613,700 threshold where the 20% capital gain rate starts for joint filers in 2026 under Rev. Proc. 2025-32, modified AGI above the $250,000 §1411 threshold, and no state income tax. Day 45 and day 180 are calendar days counted from the March 3, 2026 transfer of title to the titleholder, and the 5 business days assume no intervening federal holiday. Assumes all net proceeds are reinvested, the debt on the fourplex is at least the debt paid off on the duplex, and no boot is received, so the whole gain is deferred and basis in the fourplex is its $1,150,000 cost less the $405,000 deferred.
Bartell won in Tax Court and the IRS still refuses to follow it.
The case people cite for running long is Estate of Bartell v. Commissioner, 147 T.C. 140 (2016). An accommodator took title on August 1, 2000, six weeks before the safe harbor took effect on September 15, 2000, and held it 17 months while the taxpayer built and opened a drugstore on the land. A qualified intermediary sold the old property and delivered the parked one in December 2001. The Tax Court held it was still a §1031 exchange even though the accommodator never had the benefits and burdens of ownership. The IRS answered with Action on Decision 2017-06 on August 14, 2017, announcing nonacquiescence: outside the safe harbor it will argue the titleholder has to actually bear those benefits and burdens. Bartell is a litigating position, not a plan.
Two closings, a new entity, and a lender who has to play along.
Accommodation fees run well above a forward exchange, plus entity formation, a second closing when the parked property comes to you, and in some states a second round of transfer tax and title insurance. The titleholder has no money of its own, so you fund the purchase, which section 4.03 expressly permits: you may lend it funds, guarantee its debt, indemnify it for costs, and lease the parked property back without breaking the safe harbor. The bottleneck is usually the lender, since the borrower on the note is an LLC owned by the titleholder rather than you, and not every bank will write that loan even with your guarantee. Ask before you sign. At $105,640 of deferred tax the friction is noise. At $15,000 it is not worth doing.
Two mechanical notes. Because the safe harbor treats the titleholder as the beneficial owner while the property sits parked, your depreciation and any cost segregation study start when title comes to you, not at the parking closing. Park in December and take title in February and those deductions land in the later year. Report the exchange on Form 8824 with the return for the year you transferred the relinquished property, where basis in the replacement is its cost less the gain deferred, the same bargain described in how to avoid depreciation recapture on a rental property.