When you strip the noise away, the real question is simple: tax-loss harvesting is a timing tool, not a wealth tool. Three quick checks before you act: 1. Name the mechanism in plain English: When you sell a losing position to offset gains, you are deferring taxes, not eliminating them. The deferred tax becomes a zero-interest loan from the government. 2. Say why it matters for behavior or portfolio decisions: That matters because investors sometimes treat harvesting as free return when it is really a cash-flow advantage that benefits long holding periods. 3. Set the review question: Write down the state variable you would monitor first if this thesis started to drift. Market translation: Selling a $10k loss to offset $10k of short-term gains at a 35% bracket defers $3,500 in taxes. The value depends on what you do with that capital between now and eventual realization. Failure mode: The mistake is harvesting indiscriminately without checking wash-sale rules or whether the replacement position changes the portfolio's intended risk profile. A lot of confusion disappears once you separate the headline from the mechanism.