1031 vs. DST vs. Opportunity Zone vs. 721: Which Fits Your Gain?

A large capital gain forces a choice, and the choices are easy to confuse. Four routes dominate the deferral conversation: the 1031 exchange, the Delaware Statutory Trust, the Opportunity Zone fund, and the 721 or UPREIT exchange. All four push tax into the future, but they work on different gains, run on different clocks, and hand you very different assets at the end. This memo lays them side by side, then walks each one in depth so you can match the route to your gain, your appetite for management, and your time horizon. Read the table first. Everything after it explains the cells.

The four routes at a glance

Here is the whole decision in one frame. The factor sits in the first column; each route gets its own column. Skim it once, then read the sections that follow for the why behind each row.

Factor	1031 Exchange	DST	Opportunity Zone Fund	721 / UPREIT
Qualifying gain	Real estate	Real estate via 1031	Any capital gain	Real estate or DST interest
Deadline	45 / 180 days	45 / 180 days	180 days	At sponsor's roll-up
Reinvest	Full equity, replace debt	Full equity	The gain only	Property or OP-unit swap
Core benefit	Defer + step-up	Defer, passive, step-up	Defer, then eliminate appreciation after 10 yrs	Defer + diversify + estate liquidity
Control	High	Low	Low	Low
Liquidity at exit	Illiquid, 1031 again	Illiquid, 1031 or 721	10-yr lock	OP units convertible to REIT shares
Step-up at death	Yes	Yes	N/A on appreciation already tax-free	Yes on OP units
Tax form	Form 8824	1099 + grantor letter	K-1 + 8997 / 8949	K-1 from the OP

A simplified orientation. Each route carries nuances covered in its own guide and depends on your individual facts.

How each route actually works

Start with the mechanics, because the differences between these routes are mechanical, not cosmetic.

The 1031 exchange is a swap. You sell investment real estate, a qualified intermediary holds the proceeds so you never touch them, and you buy like-kind replacement real estate. Do it inside the deadlines and the tax bill on the old property does not come due. You report the exchange on Form 8824. You can repeat the swap as many times as you like.

A Delaware Statutory Trust is one way to fill the replacement side of a 1031 without becoming a landlord again. Revenue Ruling 2004-86 lets the IRS treat a beneficial interest in a properly structured DST as direct ownership of real estate, so the interest qualifies as 1031 replacement property. A sponsor assembles institutional assets, divides the trust into fractional interests, and you buy a slice. Because a DST is a grantor trust for tax purposes, your share of income reports on a 1099 and an accompanying grantor letter rather than a K-1.

The Opportunity Zone fund, formally a Qualified Opportunity Fund, breaks the real-estate-only pattern. You take a capital gain of any kind, reinvest the gain amount into the fund within 180 days, and the fund deploys capital into businesses or property inside designated zones. The fund issues you a Schedule K-1, and you file Form 8997 to track your qualifying investment and Form 8949 to report the original deferred gain when it is recognized.

A 721 exchange, also called an UPREIT, contributes real estate into a REIT's operating partnership in return for OP units. Section 721 makes that contribution tax-free. In practice most investors reach it through a two-step path, first a 1031 into a DST that the sponsor has earmarked for roll-up, then a 721 contribution of that DST interest into the REIT once the sponsor calls it up. The operating partnership reports your share on a K-1, and your OP units can later convert into publicly traded or non-traded REIT shares.

Qualifying gain by route

This is the first filter, and it eliminates options fast. The 1031, DST, and 721 routes all require real estate. A 1031 needs real property held for investment or business use. A DST works only as the replacement leg of a 1031, so the same real-estate requirement applies upstream. A 721 takes real property or a DST interest into the operating partnership.

The Opportunity Zone fund is the exception. It accepts any capital gain. Sell appreciated stock, exit a business, or trigger a gain on a collectible, and the proceeds can go into a QOF even though none of them touch real estate. If your gain did not come from real property, three of the four routes are off the table before you compare anything else.

Deferral versus elimination

Every route here defers. Only one eliminates, and only on part of the picture, so be precise about the difference.

Defer means the tax is postponed, not erased. A 1031, a DST, and a 721 all push the gain forward. You keep the deferred liability until you cash out in a taxable sale. There is a powerful exit, though. Hold the asset until death and your heirs receive a basis step-up to fair market value. The deferred gain disappears for them. That step-up applies to directly owned 1031 property, to a DST interest, and to 721 OP units. Used patiently, deferral can become permanent without anyone ever paying the gain.

The Opportunity Zone fund defers the original gain too, but it adds something the others cannot. Hold the fund interest ten years and the tax on the fund's own appreciation is eliminated, not merely deferred. The growth inside the fund comes out tax-free. The original gain you rolled in is still deferred and eventually recognized, but everything the fund earns after you invest can escape tax entirely on a ten-year hold. No other route on this page eliminates tax on appreciation. The trade is a long lock-up and development-style risk.

Deadlines and reinvestment amounts

The clocks differ, and so does how much money has to move.

A 1031 runs on two deadlines that start the day you close the sale. You have 45 days to identify replacement property in writing and 180 days to close on it. Both are firm. A DST runs on the same 45 and 180-day clock because it is a 1031 replacement, with the practical advantage that a DST interest can be bought in an exact dollar amount, which makes hitting the numbers easier. An Opportunity Zone investment runs on a single 180-day window from the date of the gain, or for a gain that flows through a partnership or S corporation, from the entity's year-end. A 721 has no statutory identification clock of its own. The contribution happens when the sponsor rolls the asset up into the REIT, which is why investors often park in a DST first and wait for that call.

Reinvestment amounts diverge sharply. A full 1031 requires you to reinvest all the net equity and to replace the debt that was on the relinquished property, or buy enough equity to cover it. Fall short and the shortfall is taxable boot. A DST follows the same full-reinvestment rule because it is a 1031. An Opportunity Zone fund is different and easier on cash flow. You reinvest only the gain, not the entire sale proceeds, so you can keep your original basis in your pocket. A 721 is a contribution of the property or DST interest itself, so there is no separate cash reinvestment to size.

Control and management

Control is where directly held real estate stands alone. With a 1031 into property you own, you decide everything. You pick the asset, set the rents, choose when to refinance, and choose when to sell. You also do the work, or pay someone to.

The other three routes hand the wheel to a sponsor or manager. A DST is passive by design and by law. The trust agreement bars beneficiaries from major decisions, which is part of why the IRS respects the structure, so you collect distributions and have no operational say. An Opportunity Zone fund is run by its fund manager, who sources deals, develops, and times exits on your behalf. A 721 puts you inside a REIT, where professional management runs a diversified portfolio and you hold units. If hands-on control matters to you, only the 1031 into direct property delivers it. If you want to be done managing real estate, the other three are built for that.

Liquidity and exit paths

None of these is liquid in the way a brokerage account is, but the exit doors differ, and the exits are where these routes connect to each other.

Directly held 1031 property is illiquid until you sell, and when you do you can roll into another 1031, move into a DST, or contribute into a 721. A DST is illiquid for its hold period, typically several years, after which the sponsor sells the asset and you can 1031 again into another DST or property, or 721 into the REIT if that path is offered. An Opportunity Zone fund is the most locked of the group. The ten-year clock is the whole point, so plan on a decade with little or no interim liquidity. A 721 ends in OP units, and those units are convertible into REIT shares. Non-traded REIT shares offer periodic, limited redemptions; traded REIT shares can be sold on an exchange. That convertibility is the closest thing to liquidity in this set, but converting and selling is a taxable event that gives up the deferral.

Read the exits as a chain. A 1031 flows into another 1031, a DST, or a 721. A DST flows into a 1031 or a 721. An Opportunity Zone fund flows toward its ten-year hold and then out. A 721 flows into OP units and then, when you choose, into REIT shares. That chain is why investors sequence these routes rather than picking one forever.

The 2026 Opportunity Zone changes

One route changed under 2026 law, and it is worth getting the timeline exactly right because it affects which version of the rules applies to you.

Opportunity Zones were made permanent. Starting January 1, 2027, the program continues on an ongoing basis with a rolling five-year deferral and a single ten percent basis step-up at year five, replacing the old fixed sunset and tiered step-ups. Investments made under the original program follow the original rules, which means a deferred gain rolled in under the prior regime still gets recognized on December 31, 2026. The ten-year exclusion on the fund's own appreciation still runs from your investment date, so the clock that delivers tax-free growth is unchanged by the new law.

Two points keep this in proportion. First, the change is specific to Opportunity Zones. It does not affect the 1031, the DST, or the 721 in any way. Their rules, deadlines, and tax forms are exactly what they were. Second, the permanence makes the QOF a more durable planning tool than it was when a sunset loomed, which raises its standing for any large gain with a long horizon. If you invested under the original program, mark the December 31, 2026 recognition date with your CPA. If you are investing in 2027 or later, you are working with the new rolling structure.

How to choose

Run a short decision tree. The answers usually point to one route, and sometimes to a sequence.

• Did the gain come from real estate? If no, the Opportunity Zone fund is your route. The other three require real property and cannot accept a stock or business-sale gain.
• Do you want to keep control and stay hands-on? If yes, do a 1031 into property you own. If no, a DST gives you the same deferral without the management.
• Are you ready to leave active real estate for a diversified REIT for good? If yes, the 721 path, usually reached through a DST first, consolidates into professionally managed, divisible, estate-friendly units.
• Can you lock up capital for a decade to chase tax-free growth? If yes, an Opportunity Zone fund deserves a look even for a real-estate gain, because it is the only route that eliminates tax on appreciation.

A worked example makes the tree concrete. A tired landlord selling a rental who wants passive income lands on a 1031 into a DST. A founder with a large gain from selling her company has no 1031 available, so an Opportunity Zone fund is the route. An investor nearing retirement who wants to fold a property into a diversified, divisible holding runs the two-step 1031-into-a-DST then 721-into-a-REIT. Same goal of deferring tax, three different right answers, each driven by gain type, desire for control, and time horizon. Our memo on installment sales covers another deferral option for sellers who want to spread a gain over time rather than reinvest it.

Using more than one in the same year

These routes are not mutually exclusive within a single tax year, and combining them is common. The cleanest example is the two-step path: complete a 1031 into a DST now, then let that DST interest roll into a REIT through a 721 when the sponsor calls it up. You stay flexible through the DST stage, then commit to the permanent REIT move only when you are ready.

Different gains can take different routes the same year. Sell a rental and a block of appreciated stock in the same year and you can 1031 the real-estate proceeds while sending the stock gain into a Qualified Opportunity Fund. Each gain follows the route it qualifies for. The discipline is to keep the gains and their deadlines straight, because the 45 and 180-day 1031 clocks and the 180-day OZ clock run independently and do not forgive a missed date.

Common mistakes

A handful of errors recur, and most are avoidable.

• Touching the proceeds in a 1031. Take constructive receipt of the sale funds and the exchange is dead. A qualified intermediary must hold the money from closing to closing.
• Reaching for a 1031 on a non-real-estate gain. Stock and business-sale gains do not qualify. That gain belongs in an Opportunity Zone fund or another vehicle, not a 1031.
• Under-reinvesting and creating boot. A full 1031 means reinvesting all the equity and replacing the debt. Leftover cash or reduced debt is taxable boot.
• Expecting a K-1 from a DST. A DST reports on a 1099 and a grantor letter, not a K-1. Mixing up the forms causes filing confusion at tax time.
• Treating an Opportunity Zone fund as liquid. The ten-year hold is the feature, not a suggestion. Money you might need before then does not belong there.
• Assuming a 721 can be undone. Once you are in OP units, you generally cannot 1031 back out. Converting to REIT shares and selling is a taxable event. The 721 is a one-way door, so walk through it only when you mean to.

Sources & References