Tax loss harvesting is free money from the IRS — yet only 11% of investors use it. Here’s how to save $1,000-$10,000 in taxes every year without changing your investment strategy.
I was surprised by some of these findings when I first dug into the research.
How Tax Loss Harvesting Works
- Sell an investment that’s down (realize the loss)
- Immediately buy a similar (not identical) investment
- Deduct the loss against capital gains or up to $3,000 of ordinary income
- Carry forward unused losses indefinitely
Your portfolio stays invested. Your asset allocation doesn’t change. You just capture a tax deduction along the way.
The Wash Sale Rule (The One Rule You Can’t Break)
You cannot buy a “substantially identical” security within 30 days before or after the sale. Violating this disallows the loss deduction.
Safe swaps:
| Sell | Buy Instead | Wash Sale Risk |
|---|---|---|
| VTI (Vanguard Total Market) | ITOT (iShares Total Market) | Safe |
| VOO (Vanguard S&P 500) | IVV (iShares S&P 500) | Safe |
| VXUS (Vanguard Int’l) | IXUS (iShares Int’l) | Safe |
| BND (Vanguard Bonds) | AGG (iShares Bonds) | Safe |
The Dollar Value of Harvesting
| Portfolio Size | Annual Harvesting Opportunity | Tax Savings (24% bracket) |
|---|---|---|
| $100,000 | $3,000-$8,000 | $720-$1,920 |
| $500,000 | $10,000-$30,000 | $2,400-$7,200 |
| $1,000,000 | $20,000-$60,000 | $4,800-$14,400 |
When to Harvest (The 3 Triggers)
- Market drops of 10%+: Check all positions. Even a brief dip creates harvesting opportunity
- Year-end (November): Review all unrealized losses before December 31 deadline
- After selling winners: Offset capital gains immediately with available losses
Does this match your experience?
Automated vs Manual
Robo-advisors (Betterment, Wealthfront): Harvest daily, automatically. Wealthfront claims 1.8% annual tax alpha. Worth it for portfolios over $100K.
My take: the research points in a clear direction here.
Manual (Fidelity, Schwab, Vanguard): Check quarterly. Sort positions by unrealized loss. Swap when losses exceed $1,000.
Tax disclaimer: Tax rules vary by situation. Consult a CPA or tax advisor for personalized guidance.
