What Is Tax-Loss Harvesting?
Tax-loss harvesting is the strategy of selling investments that have declined in value to realize a capital loss, which can then be used to offset capital gains from other investments — reducing your overall tax bill while keeping your portfolio fully invested in the market.
How Tax-Loss Harvesting Works
The mechanics are straightforward. When an investment in your taxable account has declined in value, you sell it to realize the loss. You immediately reinvest the proceeds in a similar (but not identical) investment to maintain your market exposure. The realized loss can then offset capital gains from other sales — reducing the taxes you owe.
Simple Example
You sell Stock A for a $15,000 gain. You also hold Stock B, which has declined by $8,000. By selling Stock B to harvest the $8,000 loss, you reduce your net taxable gain to $7,000. At a 15% long-term capital gains rate, this saves you $1,200 in taxes. You immediately reinvest the Stock B proceeds in a similar ETF to maintain your portfolio exposure.
The Wash-Sale Rule: The Critical Constraint
The Wash-Sale Rule
The IRS wash-sale rule prohibits you from claiming a tax loss if you buy a "substantially identical" security within 30 days before or after the sale. If you sell a stock at a loss and repurchase the same stock within 30 days, the loss is disallowed and added to the cost basis of the new shares.
To avoid triggering the wash-sale rule, you must either wait 31 days before repurchasing the same security, or immediately reinvest in a similar but not identical security — for example, selling one S&P 500 index fund and buying a different S&P 500 index fund from a different provider.
Who Benefits Most from Tax-Loss Harvesting
Tax-loss harvesting is most valuable in specific situations:
High-income earners with taxable accounts
Investors in the 15–20% long-term capital gains bracket (plus the 3.8% net investment income tax for very high earners) save the most from harvesting losses. Texas has no state income tax, which means federal rates are the only consideration — but federal rates alone can make harvesting highly valuable.
Investors diversifying concentrated positions
Energy workers selling highly appreciated employer stock to diversify can use harvested losses from other positions to offset the gains — reducing the tax cost of diversification.
Retirees doing Roth conversions
Harvested losses can offset the income generated by Roth conversions, allowing you to convert more of your traditional IRA to Roth without increasing your tax bill.
Investors rebalancing their portfolio
When rebalancing requires selling appreciated assets, harvested losses can offset the resulting gains — making rebalancing more tax-efficient.
Tax-Loss Harvesting and the $3,000 Ordinary Income Deduction
Capital losses first offset capital gains. If your total capital losses exceed your total capital gains in a given year, you can deduct up to $3,000 of net capital losses against ordinary income — reducing your taxable income directly. Losses beyond $3,000 carry forward to future years indefinitely, where they can offset future gains or provide additional ordinary income deductions.
This carryforward feature makes tax-loss harvesting particularly valuable in years with large market declines. Losses harvested during a bear market can offset gains for years afterward — a long-lasting tax benefit from a short-term market event.
Real-World Example: Southeast Texas Energy Worker Diversifying
A 57-year-old refinery engineer in Beaumont holds $180,000 in highly appreciated employer stock in a taxable brokerage account (cost basis: $40,000). Selling to diversify would trigger a $140,000 long-term capital gain — approximately $21,000 in federal taxes at the 15% rate.
However, she also holds an international stock fund that has declined by $22,000 from its purchase price. By harvesting that $22,000 loss before selling the employer stock, she reduces her net taxable gain to $118,000 — saving approximately $3,300 in taxes. The harvested loss is immediately reinvested in a similar international fund to maintain her portfolio exposure.
This is a simplified example, but it illustrates how tax-loss harvesting can meaningfully reduce the cost of diversifying a concentrated position — one of the most common financial planning challenges for Southeast Texas energy workers.
Important Limitations
Only applies to taxable accounts
Tax-loss harvesting has no benefit in tax-advantaged accounts (IRA, 401k, Roth IRA) because gains and losses in those accounts do not affect your current tax bill.
Does not eliminate taxes — it defers them
When you sell the replacement investment at a gain in the future, you will owe taxes on that gain. Tax-loss harvesting accelerates the recognition of losses and defers the recognition of gains — the benefit is the time value of money.
Requires careful record-keeping
You must track cost basis, holding periods, and wash-sale violations across all accounts. Errors can result in disallowed losses or incorrect tax reporting.
Transaction costs can reduce benefits
Frequent trading to harvest losses can generate transaction costs that offset the tax savings. This is less of a concern with commission-free trading, but still worth considering.
Frequently Asked Questions
What is tax-loss harvesting?
Tax-loss harvesting is the strategy of selling investments at a loss to realize a capital loss, which offsets capital gains from other investments — reducing your overall tax bill. The proceeds are immediately reinvested in a similar investment to maintain portfolio exposure.
What is the wash-sale rule?
The wash-sale rule prohibits claiming a tax loss if you buy a "substantially identical" security within 30 days before or after the sale. To avoid it, wait 31 days or reinvest in a similar but not identical security.
Who benefits most from tax-loss harvesting?
High-income earners with significant taxable investment accounts benefit most. It is also valuable for investors diversifying concentrated positions, doing Roth conversions, or rebalancing portfolios. It has no benefit inside tax-advantaged accounts (IRA, 401k).
Can you use tax losses to offset ordinary income?
Yes, but with limits. Capital losses first offset capital gains. If losses exceed gains, you can deduct up to $3,000 of net capital losses against ordinary income per year. Losses beyond $3,000 carry forward to future years indefinitely.
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Richard Placette II builds tax-efficient investment strategies for Southeast Texas retirees and pre-retirees. Schedule a complimentary consultation to discuss your situation.
About the Author: Richard Placette II is a licensed financial advisor with MRB Capital Group in Lumberton, Texas. Verifiable on FINRA BrokerCheck. This content is for informational purposes only and does not constitute tax or investment advice. Consult a qualified tax professional for advice specific to your situation.