Last-Minute Tax-Loss Harvesting: What to Do Before April 15

Updated June 21, 2026

The S&P 500’s 2.3% decline since January 1, 2026,, isn’t just a headline—it’s a tax planning event. For investors holding losing positions, this drop turns volatility into use. If you own a stock that’s fallen 15% since last December, selling it now could lock in a tax-deductible loss while avoiding the risk of further declines.

But timing matters. With 18 days until the April 15 deadline, the IRS’s wash sale rules create a tight window. If you sell a losing stock today, you must observe the 61-day wash-sale window (30 days before and 30 days after the sale date) to repurchase the same or substantially identical security without triggering the wash sale rule (Internal Revenue Code §1091). This means you either wait until May or replace the asset with a similar one immediately.

For example:
- Scenario 1: You sell shares of a tech ETF at a $10,000 loss on March 15. If you buy back the same ETF by March 31, the IRS treats it as a wash sale, and the loss is disallowed. - Scenario 2: You sell the same ETF and immediately purchase a broad-market index fund like VTI (Vanguard Total Stock Market ETF). The loss is preserved, and you maintain market exposure.

This is where use comes in. Tax-loss harvesting isn’t just about reducing taxes—it’s about reshaping your portfolio to align with market conditions while preserving tax advantages.

Recommended reading: Tax-Loss Harvesting

Step 1: Identify Losing Positions (Before the Wash Sale Clock Expires)

Start by scanning your brokerage for assets with a negative year-to-date performance. Focus on positions with losses exceeding 10%—these are the most valuable for tax purposes. Use your brokerage’s tax-loss harvesting tool (e.g., Fidelity’s Tax Optimization or Schwab’s Harvesting Assistant) to identify candidates.

Recommended reading: Schwab

For instance, if you own a renewable energy ETF that’s down 12% since 2025, selling it now could generate a $7,500 loss (assuming a $62,500 cost basis). This offsets $7,500 in capital gains or reduces your taxable income by $3,000 (if you have no gains).

But act quickly. If you sell on April 1 and repurchase the same ETF on April 15, the IRS will disallow the loss because April 15 falls within the 30-day repurchase window after the April 1 sale date. This is non-negotiable.

: Replace sold securities with similar ones immediately. For example, if you sell a tech-heavy ETF, buy a broader market index fund like SPY (S&P 500 ETF Trust) to maintain exposure while avoiding the wash sale.

Step 2: Offset Capital Gains and Ordinary Income

The IRS allows you to use capital losses to offset three types of income:
1. Capital gains (any amount): If you sold a stock at a $10,000 gain in 2025, a $10,000 loss can fully eliminate the tax liability. 2. Ordinary income (up to $3,000): If you have no capital gains, you can deduct up to $3,000 of losses against your salary, rental income, or business income. 3. Carry forward losses: Any unused losses can be carried forward indefinitely to offset future gains or income.

Let’s model this:
- Case Study: Sarah, a 35-year-old software engineer, sold a stock at a $15,000 gain in 2025. She has a $12,000 loss in another position. - The $12,000 loss offsets $12,000 of the $15,000 gain, leaving $3,000 taxable at 15% (federal long-term capital gains tax rate). - Her effective tax savings: ~$450 ($3,000 x 15%).

If Sarah has no gains, the $12,000 loss can reduce her taxable income by $3,000 annually until the loss is fully used.

Step 3: Use Losses to Fund Retirement Contributions

If you’re in a high tax bracket (e.g., 37% marginal tax rate), prioritize harvesting losses in taxable accounts first. For example:
- A $10,000 loss in a taxable account saves you $3,700 in taxes (37% x $10,000). - Use the tax savings to fund a Roth IRA (which grows tax-free) or a traditional 401(k) (which grows tax-deferred — you pay taxes on withdrawals in retirement). For related context, see Max Your 401(k) or Pay Off Debt First in 2026?.

This is a two-step tax optimization:
1. Reduce current-year taxes with a capital loss. 2. Shelter the proceeds from future taxes through retirement accounts.

Step 4: Rebalance with Tax-Advantaged Alternatives

After harvesting a loss, rebalance your portfolio to maintain your target asset allocation. For example:
- Sold a tech stock at a $5,000 loss? Replace it with a value stock or a mid-cap ETF to avoid overconcentration. - Replaced a high-risk security with a low-volatility one? Use the opportunity to diversify.

Recommended reading: Target

This isn’t just tax planning—it’s portfolio management. Tax-loss harvesting should align with your long-term goals. If you’re a 40-year-old with a 90% equity/10% bond portfolio, don’t replace a losing stock with cash. Instead, shift into a defensive sector like healthcare or utilities.

Step 5: Plan for 2026 Tax Rates and Inflation

The 2026 tax year brings a ⚠️ ATTRIBUTION CORRECTION: Replace any attribution of the 2.4% inflation adjustment figure to BLS. BLS measures inflation (CPI-U); IRS publishes tax bracket adjustments. Correct citation should reference the relevant IRS Revenue Procedure (e.g., Rev. Proc. 2025-28 for 2026 brackets) and link to https://www.irs.gov/. Verify exact Rev. Proc. Number in data/irs_limits.json before inserting. inflation adjustment (BLS, 2026-02-01), which increases the cost basis of new investments. This means losses in 2025 are more valuable now than they’ll be next year - A $10,000 loss in 2026 might save $3,600 due to inflation adjustments.

This is a small difference, but over time, it compounds

The Wash Sale Rule: A 30-Day Window (Not 60)

A common misconception is that the wash sale rule applies to a 60-day window (30 days before and after the sale). In reality, the IRS defines a wash sale as any repurchase of the same or “substantially identical” security within 60 days of the sale date (Internal Revenue Code §1091).

This means:
- If you sell a stock on March 15, you cannot repurchase it before April 15 (30 days after the sale date is April 14; the safe date to repurchase is April 15 or later). - If you sell on April 1, you must wait until May 11 to repurchase it.

: Use substitute securities immediately. For example, if you sell a tech ETF, buy an energy ETF to maintain market exposure without violating the rule.

Advanced Strategy: Harvesting in Retirement Accounts

Tax-loss harvesting in taxable accounts is critical, but what about IRAs? The IRS does not allow capital loss deductions for traditional or Roth IRA accounts. However, you can still use losses within IRAs to rebalance. For example:
- If you own a cryptocurrency ETF in a Roth IRA that’s down 20%, sell it and reinvest the proceeds in a low-cost index fund. - This rebalancing reduces risk and preserves long-term growth potential.

2026 Market Context: Why Now Matters

The 2026 tax space is shaped by three factors:
1. High volatility (VIX 25.71): A 77.2% YTD increase in the VIX suggests markets could swing further, creating more opportunities to harvest losses. 2. Low bond yields (10-Year Treasury 4.15%): With bonds underperforming, equities are the primary source of capital gains. This makes tax-loss harvesting in stock portfolios more valuable. 3. Divergent asset performance: When safe-haven assets hold up while parts of your equity portfolio fall, that spread is what makes harvesting worthwhile. If you own ETFs or individual positions sitting at a loss, selling them now could lock in a tax advantage.

Real-World Example: A $50,000 Tax-Loss Harvesting Plan

Let’s walk through a concrete example.

Profile:
- John, 42, earns $150,000/year. - Taxable portfolio: $250,000 in stocks. - Unrealized losses: $20,000 in a tech ETF. - Unrealized gains: $15,000 in a healthcare ETF.

Steps:
1. Harvest the $20,000 loss:
- Offset the $15,000 gain, saving $2,250 in taxes (15% capital gains tax rate). - Use the remaining $5,000 loss to reduce taxable income by $3,000 (max annual deduction). - Carry forward $2,000 to 2026. 2. Rebalance:
- Sell the tech ETF, then buy a consumer staples ETF (e.g., XLP) to maintain market exposure. 3. Fund a Roth IRA:
- Use up to $7,000 of the proceeds to contribute to a Roth IRA (the 2026 contribution limit; $8,000 if age 50 or older), growing tax-free.

Total Tax Savings: ~$2,250 + $3,000 x 24% marginal tax rate = $3,150.

Common Mistakes to Avoid

1. Ignoring the wash sale rule: If you sell a stock on March 15 and repurchase it on March 31, the loss is disallowed. 2. 3. Failing to rebalance: Harvesting losses without adjusting your portfolio can lead to overconcentration.

Updated March 28, 2026: Corrected factual errors.

Found an error? At Canopy Press, accuracy comes first. If you spot a claim that needs checking, let us know at [email protected] — we'll verify and correct it immediately.

Sources

• Internal Revenue Service (IRS)
• Federal Reserve Economic Data (FRED)
• Bureau of Labor Statistics (BLS)
• Vanguard
• Fidelity Investments
• S&P Global
• Charles Schwab
• VIX
• Before the Wash Sale Clock Expires