Section 1031 is almost always explained as a way to get bigger. Sell the duplex, roll into the fourplex, defer the tax, repeat.
That's true, and it's the least interesting thing it does.
The more useful reading is this: a 1031 exchange is the mechanism the tax code offers for changing the risk profile of your real estate without paying for the privilege. You can take capital out of a market you no longer believe in and put it into one you do, and the tax bill — capital gain and depreciation recapture — is deferred rather than settled.
That matters because, as I wrote last time, the tax on the way out of a long-held rental can exceed everything the property earned in appreciation. Recapture is what makes a risky property expensive to leave. A 1031 is the code's answer to it.
Like-kind does not mean like-located
This is the whole point, and it's the part most often misunderstood.
For real estate, "like-kind" is drawn extraordinarily broadly. Essentially any U.S. real property held for investment or business use is like-kind to any other. Raw land for an apartment building. A rental house for farmland. A duplex in a fire corridor for a triplex nine hundred miles away, in a market with water.
The code has no view on geography. It has no view on hazard. It has no opinion whatsoever on whether your replacement property is safer than the one you sold — and it will defer your tax either way. The opportunity and the risk are the same fact.
Two limits. Since 2018, §1031 applies to real property only — no vehicles, no equipment, no collectibles. And U.S. real property is not like-kind to foreign real property. Domestic for domestic.
What full deferral actually requires
Deferral isn't automatic, and partial credit isn't the default. To defer the entire gain, three conditions generally have to hold:
- Buy equal or greater value. Trade down and the difference is taxable.
- Reinvest all the equity. Cash you take off the table is "boot," and boot is taxed — recapture first.
- Replace the debt. If the old property carried a $400,000 mortgage and the new one carries $250,000, that $150,000 of debt relief is treated much as though you had pocketed it. You can plug the gap with cash, but it has to be plugged.
Miss one of the three and you don't lose the exchange — you pay tax on the shortfall. Which is often perfectly fine, as long as it's a decision rather than a discovery.
The clock is the real risk
The deadlines are the reason exchanges fail, and they are unforgiving by design.
From the day your sale closes, you have:
- 45 days to identify your replacement property, in writing, signed, and delivered to your qualified intermediary by midnight of the 45th day. You may name up to three properties of any value, or any number of properties whose combined value doesn't exceed 200% of what you sold. (A third route exists for those who overshoot, but it requires you to actually acquire 95% of everything you named, which is not a plan so much as a rescue.)
- 180 days to close — or the due date of your tax return including extensions, whichever comes first.
Both clocks start at the same moment and run at the same time. The 180 days are not 180 days after the 45. And neither deadline moves for a weekend, a holiday, a financing delay, or a seller who gets cold feet.
There is one exception, and it is the climate one. Under Rev. Proc. 2018-58, the IRS can extend both deadlines for taxpayers affected by a federally declared disaster — relief that is issued disaster by disaster, in a published notice. It is worth knowing that it exists. It is not something to plan around, because you cannot know in advance whether it will be there.
You also cannot touch the money. The proceeds go to a qualified intermediary at closing. If the funds land somewhere you control — even briefly — you may be treated as having received them, and there is no exchange left to rescue.
Miss a deadline and it isn't partial credit. It's a fully taxable sale — with the recapture intact, and the proceeds possibly already committed to a purchase you can no longer make. Usually in the year you sold, though an exchange that fails across a year-end may fall into the next one.
The counterweight: 45 days is an engine for buying badly
Here's the part I'd most want an investor to hold onto.
The reason to do this exchange is to reduce the climate risk in a portfolio. But the structure of the exchange creates real pressure to buy something — anything — within 45 days of handing over the keys. And a 45-day search is not a search. It's a scramble.
"Anywhere but here" is not the same as "somewhere safer." A fire-corridor rental exchanged in a hurry for a flood-plain rental has deferred the tax and kept the risk, with a fresh set of transaction costs attached. And you now hold it with a low carried-over basis, which makes the next exit expensive too.
The fix is unglamorous, and it is entirely within your control: do the location work before you list, not after you close. Understand the market you're moving into — the hazard profile, the insurance market, the water, the direction of travel — while the clock isn't running. The 45 days should be for finding the right building in a market you have already chosen. They are a poor time to be choosing the market.
This is the search High Ground Map is built to run. Compare regions on climate fit, use Optimize to surface the best-scoring locations across a map view, and run a Neighborhood Scan once you've narrowed to a town — because resilience can vary meaningfully within a few streets, and that is a difficult distinction to draw well once the clock is already running.
Two things that carry over with you
Your basis does. This is a deferral, not a reset. The low basis you built up through years of depreciation follows you into the replacement property — you do not get to start depreciating the new building from its full purchase price.
In practice the new property runs on two schedules: the basis you carried over continues on the remaining life of the old property's schedule, while any new money you put in is treated as newly placed in service and gets a fresh 27.5 years of its own. The cash-flow model on the replacement property is not the one you would build for a straight purchase at the same price, and the difference is not small.
And in California, so does the state's claim. If you exchange California property for property in another state, California does not forget. Under R&TC §18032 you file Form FTB 3840 for the year of the exchange, and again for every subsequent year until that deferred California-source gain is finally recognized — an obligation that continues even if you later exchange the replacement property for something else. When the gain is eventually recognized, California taxes it as California-source income, regardless of where the property sits by then, and regardless of where you are.
You can move to Idaho. The gain stays a California gain.
This isn't a reason to skip the exchange. Deferral is still valuable, and moving the risk is the point. But an owner modelling a climate-motivated exchange out of California as a permanent escape from California tax has modelled it wrong — and the Franchise Tax Board has said that where the form isn't filed, it may propose an assessment on the previously deferred gain, with penalties and interest.
The argument against, which nobody makes
There is a real cost to deferring, and it is the mirror image of the point I made in the last post.
If you are carrying suspended passive losses on the property — rental losses your income was too high to deduct in the years they arose — a fully taxable sale releases them, and they offset the gain. An exchange does not. Defer the gain and those losses stay suspended, still waiting, doing nothing for you now.
For an owner with a large balance of them, selling and paying can be cheaper than it looks, and exchanging can be dearer than it looks. That comparison is worth running before you assume deferral is the better answer. It often is. It is not automatically.
And it is not for your house
One clarification, because it's the most common misunderstanding I hear.
§1031 is for investment and business property. Your home does not qualify. If you want to move yourself to higher ground, the relevant provision is §121 — the residence exclusion — and it works on entirely different rules. A 1031 moves your capital. It does not move you.
The mechanism
If you own a rental in a market whose risk is heading one direction and whose insurance market is heading the same one, you have three exits: hold it, sell it and pay, or exchange it and defer.
The third is the only one that lets you re-risk the position at full value — and it depends almost entirely on knowing where you are going before the clock starts.
This is general information, not tax advice. A 1031 exchange has strict requirements and the consequences of a misstep are significant; work with a qualified intermediary and your own tax advisor before acting.