Eight mistakes that turn a deferred tax into a due tax.
Every one of these has happened to a real owner. Most were entirely preventable with one conversation, a week earlier.
The short answer
The eight ways 1031 exchanges fail, in rough order of how often we see them: touching the money, setting up too late, naming only one replacement property, buying down in value or failing to replace debt, vague identification, title mismatch, related party problems, and letting the deadline pick the investment.
Only the first one is truly unfixable. The rest are avoidable with planning that costs nothing.
1. Taking receipt of the proceeds
What happens: the sale closes, escrow wires the money to the seller's bank account or to their attorney's trust account, and only then does someone mention a 1031 exchange. The owner assumes they can simply move the money to an intermediary next week.
Why it is fatal: the rule is not about where the money ends up. It is about whether you ever had the right to control it. Lawyers call this actual or constructive receipt. Once you have it, the sale is complete for tax purposes and Section 1031 does not apply. No amendment, no attorney letter, and no sympathetic IRS agent can undo it.
Prevention: engage a qualified intermediary as soon as you have an accepted offer. It takes a day or two and costs a fraction of the tax. Add cooperation language to the purchase agreement. Confirm with escrow in writing, before the closing date, where the funds are going. How to vet an intermediary →
2. Deciding too late
What happens: the owner thinks about an exchange during the final week of escrow, or on the day of closing. Sometimes the escrow officer catches it. Often nobody does.
Why it hurts: even when it technically works, a last-minute setup means zero time to research replacement property. The 45-day clock starts at closing whether or not you have looked at a single option. Owners who begin searching on day 1 rather than day minus 60 make rushed choices under pressure.
Prevention: start the conversation when you first think about selling, not when you have an offer. The best exchanges are ones where the replacement property was largely identified before the relinquished property even went under contract.
3. Identifying only one replacement property
What happens: the owner finds a building they love, names it on day 40, and leaves the other two identification slots empty. On day 145 the inspection turns up foundation problems, or the lender pulls out, or the seller walks.
Why it is expensive: after day 45 you cannot add to the list. If the one property on it does not close, the exchange fails completely and the entire gain becomes taxable in the year of the original sale. We have seen six-figure tax bills created by a failed roof inspection.
Use all three identification slots, and make at least one of them a Delaware Statutory Trust. A DST closes in two to five business days because the property is already owned and the documents are already drafted. It is the only replacement property that can be executed on day 175 with confidence. Whether or not you expect to use it, naming one costs you nothing and eliminates the worst outcome entirely.
4. Buying down, or failing to replace debt
What happens: the owner sells for $900,000 with a $200,000 mortgage, receives $700,000 in proceeds, buys a $700,000 property free and clear, and assumes the exchange is complete.
Why it costs money: to fully defer, you must acquire property of equal or greater value and replace debt that was paid off. Debt relief is treated as a benefit received. That $200,000 of vanished mortgage is mortgage boot, and it is taxable even though no cash ever touched your hands.
Prevention: know your two targets before you start shopping. Replacement value must be at least the net sale price. Replacement debt must be at least the debt retired, unless you bring additional cash. DSTs make this straightforward because each offering publishes its loan-to-value ratio, so you can match the leverage you need.
5. Sloppy identification language
What happens: the identification notice says "a multifamily property in the Phoenix metro area" or "one of the Smith Street duplexes."
Why it fails: the IRS requires an unambiguous description. A property must be identified specifically enough that a third party could tell exactly which one you meant. Vague identifications have been thrown out on audit, invalidating the whole exchange.
Prevention: use street addresses or legal descriptions. For a DST, use the exact trust name and either the dollar amount or the percentage interest. Deliver it signed, in writing, to the qualified intermediary, and keep proof of delivery. Email with a read receipt or certified mail both work.
6. The title does not match
What happens: the property was sold by John and Mary Smith as individuals, and the replacement is purchased by Smith Family Investments LLC. Or a partnership sells and two partners want to go separate ways with their shares.
Why it fails: the taxpayer who sold must be the taxpayer who buys. Changing the ownership entity in the middle breaks the continuity the rule requires.
Prevention: decide the vesting before you list, not during escrow. Single-member LLCs that are disregarded for tax purposes are generally fine. Partnership breakups require a "drop and swap," which involves distributing tenant-in-common interests to the partners before the sale, and it needs to happen well in advance with a tax attorney involved. Doing it the week of closing invites an audit.
7. Related party problems
What happens: the owner exchanges with a sibling, a parent, or an entity they control, or buys replacement property from a family member.
Why it is risky: when you exchange with a related party, both sides generally must hold their new property for at least two years. If either sells early, the exchange is retroactively disqualified and the gain becomes taxable in the year of the original exchange, with interest. Buying from a related party who cashes out is scrutinized especially hard, because the IRS treats it as basis shifting within a family.
Prevention: if any family member or controlled entity is on either side, involve a tax attorney before you sign anything. Some related party exchanges are perfectly legitimate. None of them should be attempted casually.
8. Letting the deadline choose the investment
What happens: day 40 arrives and nothing has worked out. Under pressure the owner identifies whatever is available, or on day 172 accepts a DST offering they have not read because it is the only one that can still close.
Why it is the worst mistake on this list: the other seven cost you tax. This one can cost you principal. Deferring $200,000 of tax is meaningless if you put $600,000 into a poorly underwritten deal because the calendar made the decision for you.
Prevention: line up replacement candidates before you close, not after. And accept that sometimes the right answer is to let the exchange fail deliberately, pay the tax, and keep the capital. Paying $180,000 in tax is better than losing $400,000 of principal. Any advisor unwilling to say that to you is not the right advisor.
Two near-misses worth knowing about
- The late-year sale. Sell in October and your April 15 tax filing deadline arrives before day 180, cutting your exchange period short. Filing an extension restores the full period. Many owners find this out in March, when it is too late to matter.
- The California clawback. If you exchange California property into out-of-state property, California expects to tax that gain eventually. You must file FTB Form 3840 with your return for the year of the exchange and every year afterward until the gain is recognized. Miss the annual filing and California can accelerate the tax and add penalties. Full detail on the California rules →
The pattern behind all eight
Seven of these eight mistakes come from starting the conversation too late. The rules are not subtle and the professionals are not expensive. What costs people money is treating the exchange as something to figure out after the sale rather than before it.
Worried you have already made one of these?
Tell us where you are in the process. If it is fixable we will tell you how, and if it is not we will tell you that too, on a free 30-minute call.
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