Tax-loss harvesting is one of those personal finance moves that sounds technical but is genuinely useful for any taxable brokerage account. The core idea is simple. When an investment is worth less than what you paid, selling it locks in a paper loss that can offset gains elsewhere, lowering your tax bill in the same year.
How it actually works
If you sell an investment at a loss, that loss can offset realized gains from other sales. If your losses exceed your gains, up to $3,000 per year can offset ordinary income, with the remainder carried forward indefinitely to future tax years. For people in higher brackets, even small losses become meaningful.
The wash-sale rule, explained simply
The IRS wash-sale rule disallows the loss if you buy the same or substantially identical security within 30 days before or after the sale. Most investors trip on this without realizing. The fix is to wait 31 days before rebuying, or replace the sold position with a similar but not identical asset, like swapping one large-cap index ETF for another from a different provider.
Steps to do it right
First, review your taxable accounts before year end and identify positions trading below cost basis. Second, decide whether you want exposure to that asset class to continue. If yes, plan a replacement security to avoid time out of the market. Third, document the transaction clearly so your tax preparer can match the harvested loss against gains.
Honest caveats
Tax-loss harvesting works only in taxable accounts. It does not apply to IRAs or 401(k)s. Frequent harvesting can also create more tax complexity than it saves, especially if your gains are mostly long-term and your bracket is moderate. Talk to a qualified tax advisor before making large moves.
The takeaway
Used carefully, tax-loss harvesting can quietly improve after-tax returns without changing your overall investment strategy. It is one of those small habits that compounds across decades.
This is general guidance, not tax advice. Personal situations vary. Consult a qualified tax professional for your specific case.
