Guide

The 180-Day Clock for Sellers: What Agents Should Know About the Opportunity Zone Deadline

How long do sellers have to reinvest capital gains in an Opportunity Zone fund? When the 180-day clock starts, how closing dates move it, and the 2027 straddle.

Updated October 18, 2026

When a seller asks “how long do I have?”, the Opportunity Zone answer is usually 180 days. The details decide whether that window works, and some of them are set by things you control as the agent, like the closing date. This guide covers what agents need to know. For the exact date on a client’s sale, use the 180-day deadline calculator, which handles every gain type.

It’s part of our series for agents. The hub is OZ talking points for your next listing appointment.

The basic rule

A seller who has an eligible capital gain can defer it by investing that amount in a qualified opportunity fund (QOF) within 180 days (IRC §1400Z-2(a)(1)(A)). The period starts on the day the gain would be recognized for federal tax purposes (Treas. Reg. §1.1400Z2(a)-1(b)(7)). For an ordinary property sale, that’s usually the closing date.

Three things are different from a 1031 exchange, and clients often mix them up:

No qualified intermediary. The seller can take the cash at closing.
No 45-day identification. The seller just needs to invest in a fund by day 180.
Only the gain. The seller doesn’t reinvest the whole price, only the gain they want to defer.

When the clock starts, by how the seller owns the property

How the seller owns it	When the 180 days usually starts
Directly, or through a single-member LLC	The closing date
A business or rental property (§1231 gain)	The closing date, for gain above ordinary-income recapture
An LLC or partnership that files its own return	The partnership’s own 180 days, or for each partner by default the last day of the partnership’s tax year, with other elections available
Seller financing (installment sale)	Each payment received, or the last day of the tax year the gain is recognized

Sources: Treas. Reg. §1.1400Z2(a)-1(b)(7), (b)(11)(iii), (b)(11)(viii) and (c)(8). The 180-day calculator applies these rules for you.

Ask how title is held at the listing appointment. A seller who owns through a partnership has more timing options than they realize, and a seller who plans to carry a note has a clock that restarts with each payment.

Why the closing date matters right now

Opportunity Zone investments made on or after January 1, 2027 fall under OZ 2.0: a five-year deferral with a 10% basis step-up (30% for a qualified rural fund), and an exclusion of fund appreciation after 10 years. Investments made in 2026 fall under the older rules, where deferred gain is recognized on December 31, 2026, so a 2026 investment defers almost nothing (Public Law 119-21 §70421). The benefits are explained in our Opportunity Zone tax benefits guide.

Treatment follows the investment date. So a seller who closed in roughly the second half of 2026 has a 180-day window that reaches into 2027, and can wait to invest under OZ 2.0. A seller closing in fall 2026 has until spring 2027. The straddle is explained in investing in Opportunity Zones starting January 1, 2027.

Don’t move a closing date for tax reasons without the seller’s CPA. Other things change with the tax year too, such as which return reports the sale and estimated tax payments.

Practical tips for agents

Give the settlement statement to the CPA promptly. The closing date and the gain figure drive everything.
Don’t let the seller plan to fund on day 179. Funds have subscription paperwork, and many accept only accredited investors. Funds that say they’re open are in the Opportunity Zone funds directory.
A failed 1031 can still use the 180 days. If an exchange falls apart, the gain may be eligible, but the start date can move when a qualified intermediary pays out in a later year. See can you 1031 into an Opportunity Zone?
Recapture doesn’t get the 180 days. Ordinary-income recapture under §1245 can’t be deferred. See depreciation recapture for selling landlords.
Paperwork comes later. The deferral is elected on Form 8997 with the seller’s return. The Form 8997 helper explains each line.

Sources: IRC §1400Z-2; Treas. Reg. §1.1400Z2(a)-1; Public Law 119-21; IRS, Opportunity Zones.

Not tax advice.

Frequently asked questions

How long does a seller have to reinvest capital gains in an Opportunity Zone fund?

Generally 180 days, starting on the day the gain would be recognized for federal tax purposes, which for a normal sale is usually the closing date (Treas. Reg. §1.1400Z2(a)-1(b)(7)). Installment sales, partnership-owned property and some other cases have different start dates.

Does the seller need a qualified intermediary like a 1031 exchange?

No. The seller can receive the sale proceeds and invest an amount equal to the eligible gain in a qualified opportunity fund within 180 days. There is no 45-day identification rule.

Can a seller who closes in 2026 invest under the OZ 2.0 rules?

Yes, if the 180-day window reaches January 1, 2027 or later and the investment is made on or after that date. Treatment follows the investment date. Investments made in 2026 fall under the older rules, where deferred gain is recognized December 31, 2026.

What if the property is owned by an LLC taxed as a partnership?

The partnership can invest the gain itself within its own 180 days, or each partner can invest their share. By default a partner's 180 days starts on the last day of the partnership's tax year, and partners can elect other start dates (Treas. Reg. §1.1400Z2(a)-1(c)(8)(iii)).

Can the seller invest on day 180?

The investment has to be made within the 180-day period, so day 180 counts. In practice, fund subscriptions take time, so sellers shouldn't plan to fund on the last day.

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Tools: 180-day rule calculator · OZ deadline planner (2026 vs 2027) · Form 8997 instructions and deferral tracker · all Opportunity Zone tools