1031 Exchange Rules Explained: A CPA's Guide for Real Estate Clients

Q: What timing trap catches year-end exchanges?

The completion period ends on the earlier of 180 days or the due date of the return for the year of transfer. A client who closes late in the year and does not extend their return can lose the exchange because the filing deadline arrived before the 180 days did — so any late-year exchange requires extending the return.

7/12/2026

There is one thing to know about this area before any of the rules: once the taxpayer receives the sale proceeds, the exchange is over. No amount of subsequent structuring recovers it.

Which makes the single most valuable thing a CPA can do in this area not the analysis but the timing of their involvement — being consulted before the closing rather than in the following February, when the only remaining question is how much tax is owed.

What Qualifies Now

The change practitioners and clients still get wrong: like-kind exchange treatment is now limited to real property. Exchanges of personal property — equipment, vehicles, aircraft, artwork, franchise rights — no longer qualify.

That matters because a great deal of older material, and a great many client recollections, assume otherwise. A client planning an equipment "exchange" is planning something that does not exist.

For real property, the requirements are:

Both properties held for productive use in a trade or business or for investment. Which excludes a primary residence, and excludes property held primarily for sale — the dealer property exclusion that catches developers and flippers. The holding purpose is a facts-and-circumstances question, and a short holding period with an evident intent to resell is the fact pattern that fails.

Like-kind, which for real property is broad — improved for unimproved, a rental house for an interest in a commercial building, farmland for a retail strip. Practitioners overestimate how restrictive this is; the real constraints are the holding purpose and the timing.

The Timing Rules — and the Trap

Forty-five days from the transfer of the relinquished property to identify replacement property, in writing, to the appropriate party.

One hundred eighty days from the transfer to complete the acquisition.

And the trap: the completion period ends on the earlier of 180 days or the due date of the return for the year of the transfer. A client who closes a sale late in the year and does not extend their return can lose the exchange because their filing deadline arrived before their 180 days did.

The practical instruction: any client with a late-year exchange must extend the return. This is a one-sentence intervention that saves the entire deferral, and it is missed because the exchange and the return are handled by different people.

Both periods are strict. There is no reasonable-cause relief for missing them in the ordinary case, and relief in federally declared disaster circumstances is the narrow exception rather than the rule.

The Qualified Intermediary and Constructive Receipt

In a deferred exchange, the taxpayer cannot receive or control the proceeds. Actual or constructive receipt disqualifies the exchange entirely.

Which is why a qualified intermediary holds the funds under a written agreement entered into before the closing. Two practical points:

The agreement must be in place before the relinquished property transfers. A taxpayer who closes and then engages an intermediary has already received the proceeds.

Intermediary selection matters in a way clients do not consider — the funds are held by a party that is not a regulated custodian in every jurisdiction, and intermediary failures have cost taxpayers their money as well as their deferral. Ask about how funds are held, whether they are segregated, and what protections exist.

The Identification Rules

Within the forty-five days, replacement property must be identified in writing with sufficient specificity. Three alternatives, and satisfying any one is enough:

Up to three properties, without regard to value.

Any number of properties whose aggregate fair market value does not exceed twice the value of the relinquished property.

Any number of properties of any value, provided the taxpayer acquires at least ninety-five percent of the aggregate value identified.

The first is what most exchanges use. The second is the useful one for a client who wants optionality. The third is a trap disguised as flexibility — identify widely under it and fail to close on nearly all of it, and the exchange fails.

Boot: Where Clients Recognize Gain They Did Not Expect

Gain is recognized to the extent of boot received, and there are two kinds. Clients understand the first and are surprised by the second.

Cash boot — proceeds not reinvested. Obvious, and clients plan for it.

Mortgage boot — a reduction in debt. If the relinquished property carried more debt than the replacement property, the debt relief is boot and produces recognized gain even though the taxpayer received no cash.

That is the recurring surprise: a client who "trades down in debt" — sells a heavily mortgaged property and buys one with a smaller loan — recognizes gain they neither expected nor have cash to pay. The client's mental model is that reinvesting the equity is sufficient; the rule requires replacing the debt as well, or offsetting it with additional cash.

The rule of thumb worth giving clients: to defer fully, buy equal or greater in value, reinvest all the equity, and replace the debt.

Also boot: non-like-kind property received, and certain expenses paid from exchange funds that are not permitted exchange expenses.

The Basis Consequence Clients Ignore

An exchange does not eliminate gain. It moves it into the replacement property's basis, and that has an ongoing cost.

The replacement property's basis is essentially the relinquished property's basis, plus additional cash invested, plus any gain recognized — which means it is lower than the purchase price by the amount of the deferred gain.

And a lower basis means lower depreciation. So the client has traded a current tax payment for reduced deductions across the entire holding period of the new property. For a client acquiring a substantially more valuable property, that reduction is meaningful and recurring.

Which is the honest framing to give a client: an exchange is a deferral with a cost, not a free benefit. Whether it is worthwhile depends on the client's rate now versus later, their holding intentions, and how much depreciation they are giving up. Model it rather than assuming the exchange is obviously correct — for some clients, particularly those with expiring losses or an unusually low-income year, paying the tax is the better answer.

Depreciation recapture is deferred along with the rest of the gain and carries over, retaining its character for when the deferral eventually ends.

Related Party Exchanges

A specific trap with a specific rule: an exchange with a related party generally requires both parties to hold their properties for a defined period — commonly two years — with exceptions. A disposition inside that window can retroactively disqualify the exchange.

And the structure that draws the most scrutiny: acquiring replacement property from a related party who receives cash, which can be treated as an indirect cashing out. This area has produced adverse decisions and warrants advice before structuring rather than after.

Partnership and Entity Problems

The hardest practical area, and worth flagging so a practitioner recognizes it early.

A partnership can exchange property. Partners cannot exchange partnership interests — an interest in a partnership is not like-kind real property.

Which creates the common problem: a partnership holds appreciated real estate, and some partners want to exchange while others want cash. The structures used to address it — distributing tenancy-in-common interests before the sale, or admitting and redeeming partners around it — involve holding-purpose and timing questions that make them genuinely risky. They are frequently done badly and they attract scrutiny.

The practical guidance: identify this situation as early as possible, involve counsel, and be candid with the client that a structure assembled weeks before a closing is materially weaker than one planned a year ahead.

Reverse and Improvement Exchanges

A reverse exchange — acquiring the replacement before selling the relinquished property — is possible using a safe harbor arrangement in which an accommodation party holds title. More expensive and more complex, and useful where a client must secure a property before their own sale closes.

An improvement or build-to-suit exchange allows exchange funds to be used for construction on the replacement property, subject to the same deadlines — which is the constraint that defeats most of them, since construction must be completed within the period to count.

State Conformity — Do Not Assume

A practitioner point that catches clients in multi-state situations.

Not all states conform, and some that do have clawback provisions: where a taxpayer exchanges property located in one state for property in another, the first state may assert a claim on the deferred gain when it is eventually recognized, sometimes requiring ongoing reporting in the interim.

Check both states — the location of the relinquished property and of the replacement — before advising, and tell the client about any continuing state filing obligation the exchange creates.

How the Deferral Ends

An eventual taxable sale, at which point the deferred gain and the carried-over recapture are recognized.

Another exchange, deferring again — which is why serial exchanging is a strategy rather than a transaction.

Death. The basis adjustment at death can eliminate the deferred gain entirely, which is the reason "exchange until you die" is a genuine estate planning approach for a client with substantial real estate and no intention of selling. Our post on estate planning fundamentals covers the surrounding considerations, and this interaction should be modeled with the client's overall plan rather than treated as a tax trick.

A failed exchange, which is fully taxable — and where a failure straddles a year end, the timing of recognition depends on the facts and is worth analyzing rather than assuming.

Structured coverage is available through the 1031 exchanges course catalog, the Certificate in Partnership Taxation for the entity issues, the Small Business Income Tax Preparation Course, the 1040 training courses listing, HS 330: Fundamentals of Estate Planning, and the tax preparer certification courses catalog.

The Practitioner's Role

Be consulted before the closing. Everything else is downstream of this. A client who calls after receiving proceeds has a tax return question, not an exchange question.

Model the exchange against paying the tax, including the depreciation the client gives up. This is analysis nobody else performs and it occasionally produces the answer that the exchange is not worth doing.

Check the debt. Confirm the client understands they must replace the debt, not only the equity, and quantify the mortgage boot before the replacement property is chosen.

Extend the return for any late-year exchange.

Check state conformity in both states, and flag any continuing reporting.

Identify the partnership problem early if there is one.

Confirm the intermediary agreement is in place before the relinquished closing.

Handle the reporting, and retain the documentation — the identification notice, the intermediary agreement, and the closing statements — because the substantiation matters years later when the deferral unwinds.

Where Exchanges Fail

The taxpayer received the proceeds, which ends it
The intermediary engaged after closing
A personal property "exchange", which no longer qualifies
Property held primarily for sale, failing the holding purpose
The forty-five day identification missed, or identification not in writing or not specific
The ninety-five percent rule used for wide identification, then not satisfied
The 180-day period truncated by the return due date, because nobody extended
Debt not replaced, producing mortgage boot and gain with no cash
Exchange funds used for non-qualifying expenses
A related party disposition inside the holding period
A partnership structure assembled weeks before closing
State conformity assumed, missing a clawback or continuing obligation
An improvement exchange where construction could not finish in time
No modeling against simply paying the tax, including the depreciation forgone

The summary for a practitioner: get consulted before the closing, tell the client they must replace the debt and not just the equity, extend the return on any late-year exchange, check both states — and model the deferral against paying the tax, because an exchange buys time at the price of every future depreciation deduction and it is not automatically the right answer.

Frequently Asked Questions

What property still qualifies for like-kind exchange treatment?

Only real property. Exchanges of personal property — equipment, vehicles, aircraft, artwork, franchise rights — no longer qualify, which matters because older material and client recollections frequently assume otherwise. For real property the like-kind requirement is broad; the real constraints are the holding purpose and the timing.

What timing trap catches year-end exchanges?

The completion period ends on the earlier of 180 days or the due date of the return for the year of transfer. A client who closes late in the year and does not extend their return can lose the exchange because the filing deadline arrived before the 180 days did — so any late-year exchange requires extending the return.

How does a client recognize gain without receiving cash?

Through mortgage boot. If the relinquished property carried more debt than the replacement property, the debt relief is boot and produces recognized gain even with no cash received. Clients believe reinvesting the equity is sufficient; the rule requires replacing the debt as well, or offsetting it with additional cash.

What does an exchange cost the client going forward?

Depreciation. The replacement property's basis is roughly the old basis plus additional cash invested plus recognized gain — lower than the purchase price by the deferred gain — so the client trades a current tax payment for reduced deductions across the whole holding period of the new property. It is a deferral with a cost, and for a client with expiring losses or a low-income year, paying the tax can be the better answer.

Can partners in a partnership do their own exchanges?

No — a partnership interest is not like-kind real property. A partnership can exchange property, but where some partners want to exchange and others want cash, the structures used to accommodate that involve holding-purpose and timing questions that make them genuinely risky. They should be planned well ahead and with counsel, not assembled weeks before a closing.

Does state treatment follow the federal rules?

Not always. Some states do not conform, and some that do have clawback provisions asserting a claim on deferred gain when a taxpayer exchanges out-of-state property — sometimes with continuing reporting obligations in the interim. Both the relinquished and replacement property states should be checked before advising.