1031 Exchange Rules and Deadlines: How People Blow the 45- and 180-Day Clocks

A §1031 exchange defers gain on real property held for investment or use in a trade or business when you swap it for like-kind real property. It defers tax. It does not erase it.

Two clocks control everything. You have 45 days from the sale of the relinquished property to identify replacement property in writing, and 180 days to close on it. Both run from the same date. Both are counted in calendar days. Neither is extended for a Saturday, Sunday, or holiday. See §1031(a)(3) and Reg. §1.1031(k)-1(b).

Miss either clock by one day and the exchange fails. There is no reasonable-cause relief, no late-filing cure, no discretion. The gain is recognized in the year of sale.

What qualifies for a 1031 exchange after 2017?

Only real property. The Tax Cuts and Jobs Act amended §1031(a)(1) so that, for exchanges completed after December 31, 2017, personal property and intangibles no longer qualify.

Both the relinquished and replacement property must be:

• Real property located in the United States (foreign real property is not like-kind to US real property under §1031(h)).
• Held for productive use in a trade or business, or for investment.

Not eligible:

• A primary residence (that is §121 territory).
• Property held primarily for sale (dealer inventory, flips).
• Partnership interests (§1031(a)(2)(D)).

"Like-kind" for real estate is broad. Raw land exchanges for an apartment building. A rental condo exchanges for a strip mall. Grade and improvement do not matter; character of the interest does.

How do the 45-day and 180-day deadlines work?

Day zero is the closing date of the relinquished property. The identification period is the next 45 days. The exchange period is the next 180 days. They run concurrently, not back to back.

Clock	Length	Starts	Ends	Extended for weekends/holidays?
Identification	45 days	Day after relinquished sale closes	Midnight of day 45	No
Exchange (closing)	180 days	Day after relinquished sale closes	Midnight of day 180	No

One trap hides in the 180. Under §1031(a)(3)(B), the exchange period ends on the earlier of 180 days or the due date of your return (including extensions) for the year of the sale. Sell in November or December, and an April 15 filing deadline can cut the 180 days short. File Form 4868 to preserve the full 180.

What are the identification rules?

Identification must be in writing, signed, and delivered to a party involved in the exchange (usually the qualified intermediary) by day 45. Reg. §1.1031(k)-1(c) sets three permitted methods, and you pick one:

1. Three-property rule. Identify up to three properties, any value.
2. 200% rule. Identify any number of properties, as long as their combined fair market value does not exceed 200% of the relinquished property's value.
3. 95% rule. Identify any number at any value, but you must actually acquire at least 95% of the total value identified.

Most investors use the three-property rule. It is the cleanest. Overshoot it, blow the 200% cap, and every identification is treated as if none were made, which fails the exchange.

Why do you need a qualified intermediary?

Because you cannot touch the money. If you receive or control the sale proceeds, you have constructive receipt and the exchange fails.

A qualified intermediary (QI) holds the proceeds between the two closings under Reg. §1.1031(k)-1(g)(4). The QI is defined to exclude your agent: your attorney, CPA, employee, broker, or a relative who has represented you within the two years before the exchange generally cannot serve. Retain an independent QI before the first closing, not after.

The QI is unregulated at the federal level. Vet it. Ask where funds are held, whether the account is segregated, and whether there is a fidelity bond. QI failures and defalcations are a real risk, not a theoretical one.

What is boot and how does it trigger tax?

Boot is anything you receive that is not like-kind real property. Cash boot and mortgage boot both trigger recognized gain up to the amount of boot received, under §1031(b).

Two common sources:

• Cash boot. Leftover proceeds the QI returns to you because the replacement cost less than the relinquished sale.
• Mortgage boot. Debt relief. If the relinquished property carried a $400,000 mortgage and the replacement carries $250,000, the $150,000 of net debt reduction is boot, even if you never see a dollar of cash.

To fully defer, the standard rule of thumb: buy equal or up in both price and equity, and replace the debt (or add cash to offset the reduced debt).

Does a 1031 exchange ever wipe out the tax?

Not during your life. It defers. Depreciation recapture and deferred gain follow you into the replacement property's basis under §1031(d).

The one true forgiveness is death. If you hold the replacement property until you die, your heirs take a stepped-up basis under §1014, and the deferred gain evaporates for income-tax purposes. "Swap till you drop" is a real plan, with real estate-tax and estate-planning tradeoffs. Coordinate it with your estate attorney; the income-tax deferral is only one variable.

The ways people actually blow it

A landscape-supply owner, married filing jointly, sold a warehouse in late November for $1.2 million with a $300,000 gain. He identified three replacements by day 45. Then two deals fell through, and he scrambled to close the third.

The problem was not the 180-day clock. It was the calendar. He filed his 1040 on April 12 without extending. That filing date became his exchange-period cutoff under §1031(a)(3)(B), which landed before his day 180. His closing, set for late April, was now outside the exchange period. A single Form 4868 filed before April 15 would have preserved the full 180 days. It was not filed. The $300,000 gain came home, plus §1250 recapture at 25%.

The recurring failure points, in order of how often they bite:

• The return-due-date trap. Late-year sales without an extension.
• Blown identification. Missing day 45, or identifying too much and busting the 200% rule.
• Constructive receipt. Proceeds routed through the taxpayer's own account instead of a QI.
• Debt mismatch. Trading down on the mortgage and eating mortgage boot without realizing it.
• Related-party churns. Exchanges with a related party that unwind inside two years, which reverses the deferral under §1031(f).

None of these get cured after the fact. The exchange is built correctly on day one or it fails. Set the QI before the first closing, calendar both deadlines the hour the relinquished property sells, and, for any sale after roughly October 18, extend the return as a reflex.

Positions depend on your facts and jurisdiction. Confirm current figures with your preparer before you rely on them.

Sources

• IRC §1031 (like-kind exchanges), including §1031(a)(1), (a)(2)(D), (a)(3), (b), (d), (f), and (h)
• IRC §121 (primary residence exclusion)
• IRC §1014 (basis step-up at death)
• IRC §1250 (depreciation recapture)
• Treas. Reg. §1.1031(k)-1, including (b), (c), and (g)(4)
• IRS Form 4868 (Application for Automatic Extension of Time To File)
• Tax Cuts and Jobs Act of 2017, amendment to §1031(a)(1)