Consider an investor who bought Bitcoin when it was worth $100,000 but is now holding it at a lower price, producing an unrealized loss of $5,000. With the current loophole, the investor can sell—and immediately buy back—the Bitcoin to realize that loss, offsetting $5,000 in capital gains elsewhere. For an investor with $20,000 in realized long-term capital gains taxed at 15%, that would reduce their tax bill by hundreds of dollars.