What is a qof for tax purposes?

A QOF, or Qualified Opportunity Fund, is an investment vehicle, organized as a partnership or corporation, that self-certifies with the IRS and holds at least 90% of its assets in qualifying Opportunity Zone property so that investors can defer, and in some cases reduce, tax on capital gains under IRC 1400Z-2.

For tax purposes, investing in a QOF valuation works like this:

• Deferral: an investor reinvests eligible capital gains into a QOF within 180 days of realizing them, and that gain is excluded from taxable income in the year it was earned.
• Inclusion event: the deferred gain becomes taxable at the earlier of the date the QOF interest is sold or December 31, 2026, whichever comes first.
• Basis step-up: an investor's initial basis in the QOF interest starts at zero, and holding the investment for at least 10 years allows a basis increase to the interest's fair market value at disposition, which can exclude post-investment appreciation from tax entirely.

Because the deferred gain recognized at the inclusion event is generally the lesser of the original deferred amount or the current fair market value of the QOF interest, a documented fair market value becomes essential once December 31, 2026 arrives. QOF interests are also illiquid and typically held by a small group of partners, so LPs, funds, and their CPAs or tax attorneys need a defensible valuation rather than an informal estimate whenever the fund reports to investors or auditors, an interest is transferred, or partners dispute capital account value.

If you're an investor or fund manager approaching the 2026 inclusion date, see our answer on the 10 year rule for QOZ and what happens to Opportunity Zones after 2026 for more on how these deadlines affect your holding.