Title 26 › Subtitle Subtitle A— Income Taxes › Chapter 1— NORMAL TAXES AND SURTAXES › Subchapter P— Capital Gains and Losses › Part IV— SPECIAL RULES FOR DETERMINING CAPITAL GAINS AND LOSSES › § 1259
If you own stock, a debt instrument, or a partnership interest that has gone up in value, you normally don't pay tax on the gain until you sell. But if you lock in that gain another way — by short-selling the same or nearly identical property, entering an offsetting notional principal contract on it, or signing a futures or forward contract to deliver it — the law treats that as a "constructive sale." You must report the gain as if you had sold the investment at its market value on that date, and your holding period starts over. The rule also works in reverse: if your appreciated position is itself a short sale or one of those contracts, buying the same property triggers it. There are exceptions. Straight debt that pays a fixed principal and can't be converted into the issuer's stock doesn't count, and neither do positions already marked to market under the tax law. A contract to sell stock, debt, or a partnership interest that is not a marketable security isn't a constructive sale if it settles within 1 year. And a transaction is disregarded if it is closed by the 30th day after the end of the tax year and you then hold the appreciated position, without reducing your risk of loss, for the 60 days after closing.
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Internal Revenue Code — Source: USLM XML via OLRC
Legislative History
Reference
Citation
26 U.S.C. § 1259
Title 26 — Internal Revenue Code
Last Updated
Apr 6, 2026
Release point: 119-73