Section 1031 Like-Kind Exchange for Small Business Real Estate

By Yarik Yarosh, CPA ·September 5, 2026 ·Updated September 23, 2026 ·9 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The Section 1031 like-kind exchange is one of the most powerful tax deferral tools available to real estate investors and business owners who hold real property. It allows the taxpayer to sell an investment or business-use property and defer ALL capital gains tax (including depreciation recapture) by reinvesting the proceeds into a replacement property of “like kind.” The exchange can be repeated indefinitely, deferring tax across multiple property transactions until the owner dies (at which point the heir receives a stepped-up basis and the deferred gain disappears under IRC 1014).

✓Key takeaway

1031 exchange requirements (IRC 1031):

What qualifies:

Real property held for investment or business use exchanged for other real property held for investment or business use
“Like kind” is broadly defined for real estate: an apartment building can be exchanged for a strip mall, raw land for a warehouse, a single-family rental for a commercial building
Real property in the US can only be exchanged for other US real property (TCJA eliminated personal property exchanges after 2017)

What does NOT qualify:

Personal residence (the home you live in)
Inventory or property held primarily for sale (a house flipper’s inventory does NOT qualify)
Personal property (vehicles, equipment, machinery): TCJA eliminated personal property 1031 exchanges effective January 1, 2018
Partnership interests (but interests in entities that hold real property may qualify if structured correctly)

Timeline requirements:

Day 0: The relinquished property closes (sold)
Day 45: The taxpayer must identify replacement property(ies) in writing to the qualified intermediary
Day 180: The replacement property must close (purchased), or by the tax return due date (including extensions), whichever is earlier
These deadlines are ABSOLUTE. No extensions (not even for weekends or holidays, though the IRS has granted limited disaster relief)

Identification rules:

Three-property rule: Identify up to 3 replacement properties, regardless of value
200% rule: Identify any number of properties, but their combined FMV cannot exceed 200% of the relinquished property’s FMV
95% rule: Identify any number of properties at any value, but must acquire 95% of the identified value (rarely used)

Qualified intermediary (QI) requirement:

The taxpayer CANNOT touch the sale proceeds. A qualified intermediary (an independent third party, not the taxpayer’s attorney, accountant, agent, or employee) must hold the funds between the sale and the purchase.
If the taxpayer receives the proceeds, even briefly, the exchange fails and all gains are taxable.

Boot:

“Boot” is anything received in the exchange that is not like-kind property: cash, debt relief in excess of new debt, or personal property
Boot is taxable. If the taxpayer receives $50,000 in boot (e.g., the relinquished property was sold for $500,000 but the replacement cost $450,000), the $50,000 is taxable gain.
To defer ALL gain: the replacement property must cost at least as much as the relinquished property, AND the taxpayer must reinvest all net proceeds.

Related-party restrictions (IRC 1031(f)):

Exchanges between related parties (family members, controlled entities) are subject to a 2-year holding requirement. If either party disposes of the exchanged property within 2 years, the original exchange is disqualified and the deferred gain becomes taxable.

How much tax does a 1031 exchange defer?

Hypothetical example

Round numbers. A small business owner sells a commercial property used for their business and purchases a replacement property.

Relinquished property:

Original purchase price: $300,000
Accumulated depreciation (10 years of ownership): $77,000
Adjusted basis: $223,000
Sale price: $500,000
Selling costs (broker, closing): $30,000
Net proceeds: $470,000

Without 1031 exchange (taxable sale):

Capital gain: $500,000 - $30,000 - $223,000 = $247,000
Depreciation recapture (Section 1250): $77,000 x 25% = $19,250
Long-term capital gain: ($247,000 - $77,000) x 20% = $34,000
Net Investment Income Tax (NIIT): $247,000 x 3.8% = $9,386
State tax (varies): approximately $10,000
Total tax: approximately $72,636

With 1031 exchange (replacement property costs $550,000):

No gain recognized (all proceeds reinvested plus additional cash)
Tax deferred: $72,636
Replacement property basis: $223,000 + $80,000 (additional cash invested) = $303,000 (carryover basis plus additional investment)
The deferred gain carries over to the replacement property through the adjusted basis

If the owner never sells the replacement property (holds until death):

Heir receives stepped-up basis to FMV at date of death
The $247,000 in deferred gain disappears
Total tax on the gain: $0

Serial exchanges (“swap till you drop”):

The deferral can continue indefinitely through successive 1031 exchanges
Each exchange carries the deferred gain forward into the next property through the carryover basis
The common strategy is to keep exchanging until death, when the stepped-up basis eliminates all accumulated deferred gains

Partial exchange (boot received): If the replacement property costs only $420,000:

Cash boot received: $470,000 - $420,000 = $50,000
Taxable gain: $50,000 (limited to the lesser of boot received or total gain)
Tax on $50,000: approximately $10,000 (capital gains rate)
Deferred gain: $247,000 - $50,000 = $197,000

Common 1031 exchange mistakes:

Missing the 45-day identification deadline (fatal, cannot be fixed)
Taking possession of the sale proceeds instead of using a QI (fatal)
Using a related party as the QI (disqualified)
Not identifying the replacement property in writing (verbal identification is not valid)
Exchanging into a property the taxpayer intends to use as a personal residence (1031 requires investment or business use)
Not accounting for debt relief as boot (if the old property had a $200,000 mortgage and the new property has a $100,000 mortgage, the $100,000 debt relief is boot)

Illustrative numbers only, not a real client and not advice for your facts.

What are the strict deadlines for completing a 1031 exchange?

A 1031 exchange imposes two non-negotiable deadlines. You have 45 calendar days from the date you sell the relinquished property to identify potential replacement properties in writing to the qualified intermediary. You must close on the replacement property within 180 calendar days of the sale (or by the due date of your tax return, including extensions, whichever comes first). These deadlines cannot be extended, even for weekends or holidays. If you miss either deadline, the entire exchange fails and the full gain becomes taxable in the year of the original sale.

What is real estate professional status and why does it matter for taxes?

Real estate professional status (REPS) under IRC 469(c)(7) removes the automatic passive label from rental real estate, so if you also materially participate, rental losses can offset ordinary income without the $25,000 active participation limitation. To qualify, you must spend more than 750 hours in real property trades or businesses in which you materially participate during the year AND more than half of your total working hours must be in those activities. Each rental property must be separately evaluated for material participation unless you elect to aggregate all rental activities. This status is particularly valuable for taxpayers with significant rental depreciation deductions that would otherwise be suspended as passive losses. The IRS closely scrutinizes REPS claims, so detailed time logs are essential.

Related guides:

What if the building you exchange was a rental with losses?

Then the exchange generally leaves those losses parked. Rental activity is passive by default, and a loss you couldn’t use carries forward as a deduction for the same activity. It’s freed when you dispose of your entire interest in the activity and all of the gain is recognized, and a 1031 exchange defers gain, so it generally doesn’t meet that test.

That shifts the math in the example above. The taxable-sale column shows about $72,636 of tax and gives no credit for losses. If that building had been rented to tenants with losses carried forward, a fully taxable sale to an unrelated buyer would free them. They’d first offset passive income from your other activities that year, and the rest would be treated as non-passive, though a very large release can still run into the excess business loss limit.

A sale to a related party under section 267(b) or 707(b)(1) doesn’t free anything until that party sells to someone unrelated. And if you do exchange, the losses don’t disappear; they keep carrying forward under the passive activity loss rules.

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Cite this page

Yarik Yarosh, CPA. "Section 1031 Like-Kind Exchange for Small Business Real Estate." Blue Cloud CPA, September 5, 2026, updated September 23, 2026. https://bluecloudcpa.com/guides/small-business-1031-like-kind-exchange-guide

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.