Selling a stock at a loss lets you offset capital gains and deduct up to $3,000 per year against your ordinary income. Called tax-loss harvesting, it’s one of the most powerful (and legal) tax strategies available to investors.
How Capital Losses Work
| Step | What Happens |
|---|---|
| 1 | You sell a stock for less than you paid |
| 2 | The difference is a capital loss |
| 3 | Short-term losses (held < 1 year) offset short-term gains first |
| 4 | Long-term losses (held > 1 year) offset long-term gains first |
| 5 | Net losses offset gains from the other category |
| 6 | Remaining net losses deduct up to $3,000 against ordinary income |
| 7 | Excess losses carry forward to future years |
Tax Savings Examples
$10,000 loss, 24% tax bracket:
| Scenario | How the Loss Is Used | Tax Savings |
|---|---|---|
| $10,000 in gains to offset | Loss offsets all gains | $1,500-$2,400 (depending on gain type) |
| $5,000 in gains + $3,000 ordinary income offset | Loss offsets gains + $3K income | $1,470 |
| No gains at all | $3,000 offset/year for 3.3 years | $2,400 total (spread over years) |
Detailed breakdown with $15,000 long-term loss, $8,000 long-term gain, 24% bracket:
| Item | Amount |
|---|---|
| Long-term capital loss | -$15,000 |
| Long-term capital gain | +$8,000 |
| Net capital loss | -$7,000 |
| Year 1: Offset ordinary income | -$3,000 (saves $720) |
| Year 2: Carry forward to offset income | -$3,000 (saves $720) |
| Year 3: Remaining carry forward | -$1,000 (saves $240) |
| Total tax savings | $1,680 |
Short-Term vs. Long-Term Losses
| Loss Type | Holding Period | First Offsets | Tax Rate on Offset Gains |
|---|---|---|---|
| Short-term loss | Under 1 year | Short-term gains | Up to 37% (ordinary rates) |
| Long-term loss | Over 1 year | Long-term gains | 0-20% (LTCG rates) |
Short-term losses are more valuable because they first offset gains taxed at higher ordinary income rates.
The Wash Sale Rule
| Rule | Details |
|---|---|
| What it is | You can’t claim a loss if you buy the same/substantially identical security within 30 days |
| Window | 30 days before AND 30 days after the sale (61-day total window) |
| What triggers it | Buying the same stock, substantially identical stock, option on same stock |
| What happens | Loss is disallowed; added to new shares’ cost basis |
| Applies to | All accounts you own (taxable, IRA, spouse’s accounts) |
What counts as “substantially identical”:
| Substantially Identical? | Example |
|---|---|
| ✅ Yes | Selling Apple stock, buying Apple stock within 30 days |
| ✅ Yes | Selling shares, buying call options on same stock |
| ❌ No | Selling S&P 500 index fund (Vanguard), buying S&P 500 ETF (iShares) — debatable |
| ❌ No | Selling one tech stock, buying a different tech stock |
| ❌ No | Selling individual stock, buying a broad market index fund |
Tax-Loss Harvesting Strategy
| Step | Action |
|---|---|
| 1 | Identify losing positions in your taxable account |
| 2 | Sell the losing position |
| 3 | Immediately buy a similar (but not substantially identical) investment |
| 4 | Wait 31 days if you want to buy back the exact same security |
| 5 | Claim the loss on your tax return (Schedule D) |
Example swap pairs (not substantially identical):
| Sell | Buy Instead |
|---|---|
| Vanguard Total Stock Market (VTI) | Schwab Broad Market ETF (SCHB) |
| S&P 500 index fund | Total Market index fund |
| Individual tech stock | Technology sector ETF |
Reporting on Your Tax Return
| Form | Purpose |
|---|---|
| Form 8949 | Report each sale: date bought, date sold, proceeds, cost basis, gain/loss |
| Schedule D | Summary of all gains and losses; calculate net gain or loss |
| Line 7 of Schedule 1 | Carry the net loss (up to $3,000) to your 1040 |
| Capital Loss Carryover Worksheet | Track unused losses for future years |
The Bottom Line
Selling a stock at a loss isn’t just losing money — it’s creating a tax asset. Use losses to offset gains, deduct up to $3,000/year against income, and carry forward the rest. Just avoid wash sales (wait 31 days or buy something similar but not identical). Tax-loss harvesting is one of the easiest ways to improve your after-tax returns without changing your investment strategy.
Related: What Happens If a Stock Goes to Zero? | What Happens If Your Brokerage Goes Bankrupt?
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