Tax-loss harvesting converts underperforming investments into future tax advantages without changing your long-term asset allocation. When implemented thoughtfully, it can trim your tax bill, lower portfolio drag, and free up capital for better opportunities.
How it works
– Identify losses in taxable accounts.
When a security has declined below your original cost basis, you can sell to realize a capital loss.
– Use losses to offset capital gains.
Realized losses first offset realized capital gains of the same type (short-term vs. long-term), then other gains, reducing the taxes you owe on those gains.
– Apply excess losses against ordinary income up to the annual limit allowed by tax rules; any remaining loss becomes a carryforward that can offset future gains or income in subsequent years.
– Reinvest proceeds to stay invested and maintain your target exposure, taking care not to trigger the wash-sale rule.
Practical steps to implement
1. Review tax lots.
Look at specific lots within positions—selling a short-term gain lot and harvesting a long-term loss can have different tax outcomes. Target lots that optimize after-tax results.
2. Avoid the wash-sale trap.
The wash-sale rule disallows a loss if you buy a “substantially identical” security within a 30-day window before or after the sale.
Replace a sold ETF with a similar but not substantially identical ETF or use cash and wait the required window if you want to rebuy.
3.
Rebalance strategically.
Use harvested losses to rebalance toward your target allocation instead of letting realized losses distort your portfolio weights.
4. Track carryforwards. Maintain a ledger of unused losses. These can be valuable for offsetting gains in profitable years or when selling concentrated positions.
5. Coordinate across accounts.
Harvesting opportunities can differ across taxable accounts, IRAs, and HSAs. Losses in tax-advantaged accounts generally don’t produce tax benefits, so focus harvests in taxable accounts.
When harvesting makes the most sense
– You expect capital gains in the near term (from rebalancing, selling a concentrated holding, or taxable distributions).
– Your tax bracket for capital gains is higher today than you expect in the future, or you anticipate realizing significant gains.
– You want to reallocate without increasing overall tax exposure.
Costs and pitfalls to watch
– Transaction costs and bid-ask spreads can erode the benefit of harvesting; consider low-cost ETFs or commission-free brokers.
– Wash-sale violations can negate the tax benefit and lead to complicated adjustments.
– Short-term losses offset short-term gains first, which can be less advantageous since short-term gains are taxed at ordinary income rates.
– Over-harvesting for tax purposes without regard to portfolio quality or diversification can increase investment risk.
Advanced opportunities
Tax-gain harvesting can be useful when your tax rate on gains is low—realizing gains now at a low rate may reset cost basis higher and reduce future tax on appreciation. Harvesting losses can also be paired with Roth conversions during years when taxable income is purposely minimized to take advantage of favorable brackets.
Keep records and consult a professional
Good record-keeping of trade dates, lot-level basis, and wash-sale adjustments is essential. Because rules and individual situations vary, reviewing harvest plans with a tax professional or financial advisor helps ensure compliance and maximizes benefit.
Used consistently and thoughtfully, tax-loss harvesting can be a powerful tool to improve the after-tax performance of a taxable portfolio while staying aligned with long-term investment goals.