What is a qualified opportunity fund? QOF rules, benefits and the 180-day clock

How a qualified opportunity fund works

Congress created Opportunity Zones in the Tax Cuts and Jobs Act of 2017 to pull private capital into low-income census tracts. The vehicle is the qualified opportunity fund: an entity taxed as a corporation or partnership that is organized to invest in qualified opportunity zone property and that holds at least 90% of its assets in that property.

The deal for investors is simple. You sell an asset at a gain, invest the gain (not the whole sale price) in a QOF within 180 days, and make the deferral election on your return. The tax on that gain waits. When it does come due, part of it may be forgiven through a basis step-up. And anything the QOF investment earns on top is tax-free if you hold it long enough.

The One Big Beautiful Bill Act, signed July 4, 2025, made the program permanent. Its new rules (often called Opportunity Zones 2.0) apply to investments made on or after January 1, 2027.

Who can set up a QOF

Any entity classified as a corporation or a partnership for federal tax purposes can be a QOF, including an LLC taxed as a partnership. Individuals cannot. The entity becomes a QOF by checking the box on Form 8996 with its federal return and choosing the first month it wants to be treated as a QOF. There is no application and no IRS approval; the fund files Form 8996 every year after that to show it still meets the 90% test.

That makes the QOF itself cheap to create. The cost is compliance: the fund has to pass the asset test twice a year, and the businesses it owns have their own tests. Missing them costs money, as explained below.

What a QOF must hold: the 90% test and zone property

On two testing dates each year (the end of the first six months and the last day of the tax year), at least 90% of the QOF’s assets, on average, must be qualified opportunity zone property. That property comes in three forms:

• Stock in a corporation that is a qualified opportunity zone business (QOZB), bought for cash after 2017.
• A partnership interest in a partnership that is a QOZB, bought for cash after 2017.
• Qualified opportunity zone business property held directly: tangible property used in a zone, bought after 2017 from an unrelated party, whose original use starts with the fund or which the fund substantially improves.

Substantial improvement means adding at least as much basis as the purchase price of the building (land excluded) within 30 months. Under OZ 2.0 the bar for property in rural zones drops to 50% of basis.

Most funds own their projects through a lower-tier QOZB, because the business-level tests are more forgiving than holding property directly. A QOZB must:

• use zone property for at least 70% of its tangible property;
• earn at least 50% of its gross income from the active conduct of business in a zone;
• use a substantial portion of its intangible property (40% under the regulations) in that business;
• keep nonqualified financial property, mostly cash, under 5% of its assets, unless the cash is covered by a written working-capital safe harbor plan of up to 31 months;
• not be a “sin business”: no golf course, country club, massage parlor, hot tub or suntan facility, racetrack or other gambling facility, or store whose main business is selling alcohol for consumption off premises.

The tax benefits, old rules and new

The step-up works by giving you basis in the QOF interest equal to a percentage of the deferred gain, which reduces the gain you eventually report. Opportunity zone tax benefits, with the math runs the comparison against a taxable investment.

The 180-day rule

You must invest within 180 days of the day the gain would otherwise be recognized. Only the gain needs to go in; you can keep the rest of the sale proceeds. Short-term and long-term capital gains both qualify, and so do gains under section 1231 (the full gain on each sale, starting on the sale date).

If the gain came to you from a partnership, S corporation, estate or trust, you can start your 180 days on the date the entity recognized the gain, on the last day of the entity’s tax year, or on the due date of the entity’s return without extensions (March 15 for a calendar-year partnership). That flexibility often buys several extra months.

Why the timing matters right now

A gain invested in a QOF during the rest of 2026 is deferred only until December 31, 2026, and it cannot reach the five-year holding period needed for a step-up. In other words, a late-2026 investment buys a few weeks of deferral.

A gain realized in the second half of 2026 often has a 180-day window that runs into 2027, though. According to Notice 2026-40, a gain realized on or before December 31, 2026 but invested on or after January 1, 2027 is deferred under the new rules: until the earlier of a sale or five years after the investment, with the 10% (or 30% rural) step-up. For many investors, waiting until January is the better move. Run your dates through the worksheet above, and confirm the plan with your tax adviser.

The paperwork

• Investor, year of the gain: report the sale on Form 8949 and elect deferral there, and file Form 8997 listing the QOF investment.
• Investor, every year after: file Form 8997 with your return until the investment is gone.
• Fund, every year: file Form 8996 with its return, including the 90% test and any penalty.

Not sure whether a property qualifies? Check the address on the Opportunity Zone map, or find a CPA who files QOF returns.