Tax-loss harvesting is an active investment strategy where you sell securities trading below their purchase price to lock in losses. These losses can then offset capital gains from profitable investments, reducing your overall taxable income for the year. Any excess losses can carry forward to future years, providing ongoing tax benefits. For high-net-worth investors managing substantial portfolios, this practice can save thousands in annual taxes while keeping your asset allocation intact.
How It Works
The mechanics are straightforward: you identify underperforming positions in your portfolio and sell them at a realized loss. You then immediately purchase a similar (but not identical) security to maintain your intended market exposure. The key is the "wash-sale rule"—you cannot buy the same security within 30 days before or after the sale, or the IRS will disallow the loss deduction. Instead, you might buy a similar fund or competitor stock that tracks the same market segment.
The harvested loss gets reported on your tax return. If you have capital gains from other sales that year, the losses offset them dollar-for-dollar. If losses exceed gains, you can deduct up to $3,000 against ordinary income, with the remainder carrying forward indefinitely.
Why It Matters for Investors
For angel investors and entrepreneurs with concentrated stock positions, successful exits, or active trading, tax-loss harvesting is one of the few ways to control your tax liability. Since you're already managing your portfolio, using losses strategically is a no-cost optimization. Unlike tax deferral strategies, this creates immediate cash flow benefits. Sophisticated investors can harvest losses in down markets, then redeploy into stronger performers—essentially getting paid to rebalance.
Example
Suppose you bought 100 shares of a growth stock at $50/share ($5,000 total) that's now trading at $35/share. You've suffered a $1,500 unrealized loss. You sell those shares, locking in the loss. Simultaneously, you buy 100 shares of a comparable growth company at market price. Your portfolio exposure remains unchanged, but you've captured a $1,500 loss that offsets other gains. If you had $8,000 in gains from a startup exit, your net taxable gain drops to $6,500.
Key Takeaways
- Tax-loss harvesting offsets capital gains and reduces taxable income for the year
- Excess losses carry forward indefinitely and can offset future gains or up to $3,000 of ordinary income annually
- The wash-sale rule prevents buying identical securities within 30 days; use similar alternatives instead
- Most valuable during market downturns or when managing highly concentrated portfolios with large gains