Section 1031 lets an investor sell real property and buy other real property without paying tax on the gain at the time of the sale. That is the whole idea. Everything else is the set of conditions the tax code attaches to it, and those conditions are unusually strict: short deadlines that cannot be extended, a prohibition on touching the money, and formal requirements whose violation is not curable after the fact.
This guide covers the rules. The individual mechanics have their own pages, linked throughout.
What the deferral actually is
A 1031 exchange does not eliminate tax. It defers it.
When property is exchanged, the gain is not recognized, and the basis of the relinquished property carries over into the replacement property, adjusted for any additional cash invested. The deferred gain stays embedded in the new asset. Sell that asset in a taxable transaction later, and the accumulated gain — including gain deferred from earlier exchanges — becomes payable, along with depreciation recapture.
There is one path where the deferral becomes permanent. If the property is held until the owner dies, the heirs may receive a step-up in basis under Section 1014, which can eliminate the deferred gain entirely. This is the strategy the industry informally calls swap till you drop, and it explains why exchanges are so often paired with estate planning.
Understanding this matters because the value of an exchange depends on what happens next. An investor who exchanges and then sells for cash three years later has deferred, not avoided. An investor who exchanges repeatedly and holds until death may never pay.
What qualifies
Real property only. The 2017 tax law narrowed Section 1031 substantially. It now applies only to real property; personal property and intangibles that previously qualified no longer do.
Held for productive use in a trade or business, or for investment. This is the holding requirement, and it excludes two categories that come up constantly: property held primarily for sale — dealer property, flips, inventory — and a personal residence. Whether a given property meets the test is a facts-and-circumstances question about the taxpayer intent, and it is where a surprising number of exchanges are challenged. See 1031 exchanges and primary residences for the boundary cases.
Like-kind is broad within real property. Practically all U.S. real property held for investment is like-kind to practically all other U.S. real property. An apartment building can be exchanged for raw land, a retail strip for an industrial building, a fee interest for certain long-term leaseholds. The like-kind requirement is rarely the binding constraint. Foreign real property, however, is not like-kind to U.S. real property.
Some interests qualify that do not look like real property. A beneficial interest in a properly structured Delaware statutory trust is treated as an interest in real property under Revenue Ruling 2004-86, which is what makes DST 1031 exchanges possible. A tenant-in-common interest can qualify. A partnership interest generally does not.
The four rules that actually break exchanges
1. Do not touch the money
The taxpayer must not have actual or constructive receipt of the sale proceeds. Receiving the funds — even briefly, even into an escrow the taxpayer controls — converts the transaction into a sale.
The safe harbor uses a qualified intermediary, who receives the proceeds and applies them to the replacement property acquisition. The intermediary must be engaged before the relinquished property closes. This is the single most common irreparable error in the entire process: once the seller has received the funds, no intermediary engaged afterward can undo it. See choosing a qualified intermediary.
2. Identify within 45 days
Replacement property must be identified in a signed writing delivered to the intermediary within 45 calendar days of transferring the relinquished property, under one of three alternatives — the three-property rule, the 200% rule, or the 95% rule. The requirements are specific and the descriptions must be unambiguous. See 1031 identification rules.
3. Close within 180 days
The exchange must be complete within 180 calendar days — running concurrently with the 45 days, not after it — or by the due date of the return for the year of transfer including extensions, whichever is earlier. Both periods run in calendar days with no weekend or holiday grace, and there is no extension procedure. See the 1031 exchange timeline.
4. Do not take boot
Boot is cash or other non-like-kind value received, and it is taxable to the extent of gain. Two forms catch people:
- Cash boot — proceeds not reinvested, including money pulled out at closing.
- Mortgage boot — debt relief that is not replaced. Selling a property with a large mortgage and buying one with a smaller mortgage produces boot equal to the difference, even though no cash changed hands.
The general planning rule that follows is to acquire replacement property of equal or greater value with equal or greater debt, and to reinvest all proceeds. Partial exchanges are permitted; they simply produce partial deferral with the shortfall taxable.
The variations
Delayed (forward) exchange. The standard: sell, then buy within the deadlines. The great majority of exchanges.
Reverse exchange. Buy first, sell afterward, using an accommodation titleholder to park one property. More expensive, more complex, and unforgiving — see reverse 1031 exchanges.
Improvement or construction exchange. Proceeds are used to improve the replacement property while it is parked with an accommodator. Only improvements completed within the 180 days count toward the exchange value, which is the constraint that usually decides feasibility.
Related party exchanges. Section 1031(f) imposes additional rules, including a two-year holding requirement, on exchanges between related parties. These are structurable but require counsel.
Where DSTs and 721 exchanges fit
Two structures dominate the passive end of this market, and they are frequently confused.
A DST is replacement property. An investor exchanges into a beneficial interest in a trust holding institutional real estate, satisfying the exchange requirements while becoming entirely passive. It solves the 45-day problem, because the asset is already acquired and can close fast. Its costs and constraints are covered in DST fees and risks, and the property type DSTs most often hold is covered in net lease investment.
A 721 exchange is not a 1031 exchange at all. It is a contribution of property to a REIT operating partnership under Section 721 in return for OP units — a separate nonrecognition provision. It is frequently offered as a second step after a DST, and it is a one-way door: once OP units are held, further 1031 exchanges of that position are generally unavailable. See UPREITs.
What an exchange does not solve
Worth stating plainly, because the enthusiasm around 1031 sometimes outruns the analysis:
- It does not make a bad property good. Exchanging into an inferior asset to avoid tax is a common and expensive error. The tax tail should not wag the investment dog.
- It does not eliminate depreciation recapture — it defers it along with everything else.
- It does not help with a property held primarily for sale.
- It does not defer state tax everywhere. Some states have clawback or reporting regimes for gains deferred out of state.
- It is not the only deferral tool. Opportunity zone investments defer gain from any asset class, not only real property, under an entirely different framework with different timelines.
The cluster
- The 1031 exchange timeline — the 45- and 180-day rules
- 1031 identification rules — the three alternatives
- Qualified intermediaries — the role and how to choose one
- Reverse 1031 exchanges — buying first
- DST 1031 exchanges — passive replacement property
- The 721 exchange and UPREITs — the REIT path
- Primary residences — where Section 121 applies instead
This guide is educational and general; it is not tax or legal advice. Section 1031 is technical and fact-specific; engage qualified tax counsel and a qualified intermediary before selling.
Frequently Asked Questions
What are the rules for a 1031 exchange?
The core requirements are that both the relinquished and replacement property be real property held for productive use in a trade or business or for investment, that the taxpayer not receive the sale proceeds, that replacement property be identified within 45 days of transferring the relinquished property, and that the exchange be completed within 180 days. Falling short on any of these generally defeats the deferral.
What property qualifies for a 1031 exchange?
Since the 2017 tax law changes, Section 1031 applies only to real property held for productive use in a trade or business or for investment. Personal property and intangibles no longer qualify. Property held primarily for sale, and a personal residence, are excluded.
Is a 1031 exchange tax free?
No. It is tax deferred. The gain is not recognized at the time of the exchange, and the basis carries over into the replacement property, so the deferred gain remains embedded in the new asset. It becomes payable on a later taxable disposition, unless the position is held until death and receives a basis step-up.
Do you need a qualified intermediary?
For the standard deferred exchange, effectively yes. The taxpayer must not have actual or constructive receipt of the proceeds, and the safe harbor for achieving that uses a qualified intermediary. The intermediary must be engaged before the relinquished property closes; engaging one afterward is too late.
What is boot?
Cash or other non-like-kind value received in the exchange, including relief from debt that is not replaced. Boot is generally taxable to the extent of gain, even where the rest of the exchange qualifies. This is why exchanges commonly aim to acquire replacement property of equal or greater value with equal or greater debt.
Sources
- Internal Revenue Code Section 1031
- Treasury Regulation Section 1.1031(k)-1 (deferred exchanges)
- Internal Revenue Code Section 1014 (basis of property acquired from a decedent)
- Revenue Ruling 2004-86 (Delaware statutory trusts)
- Revenue Procedure 2000-37 and Revenue Procedure 2004-51 (reverse exchanges)
