After 32 years of IRS work — and more than $100 million in resolved tax debt — I've seen just about every version of the problem you're dealing with. I'm Darrin Mish, a tax attorney in Tampa. Here's what you should know.
I'm Darrin Mish. Tampa tax attorney, 32 years in, more than $100 million in IRS debt resolved. That's my resolution practice. What follows is the other side of the desk – the planning moves that keep you from ever needing it.
Your portfolio drops 15% in a market correction. Most investors panic or freeze. Smart ones see a tax opportunity that conventional advisors miss. Tax loss harvesting turns paper losses into real deductions, offsetting gains you've already realized and cutting your 2026 tax bill.
The IRS lets you deduct investment losses against gains. Lose money on one stock, make money on another, you pay tax only on the net. That's the foundation. But the real planning happens when you deliberately sell losing positions to create deductions you can use now or bank for later.
How Tax Loss Harvesting Reduces Your Tax Bill
You sell an investment that's worth less than what you paid. That loss offsets capital gains from other sales. First, it cancels out your gains from the same category (short-term losses offset short-term gains, long-term offset long-term). Then it crosses over. Excess short-term losses can offset long-term gains, and vice versa.
Still have losses left over? You can deduct up to $3,000 against ordinary income each year. That's salary, business income, interest. The deduction lowers your adjusted gross income, which affects everything from Medicare premiums to tax credits.
Losses beyond that $3,000 limit don't disappear. They carry forward indefinitely. You can use them in 2027, 2028, or ten years from now. Charles Schwab outlines this strategy as a way to offset gains across multiple years, building a loss bank that protects future profits.
The Numbers Behind the Strategy
A practical example shows the math. You bought Stock A for $50,000, now worth $35,000. You bought Stock B for $30,000, now worth $55,000. Sell both and you've got a $15,000 loss and a $25,000 gain.
Net gain: $10,000. That's what you pay tax on. At the 15% long-term capital gains rate, you owe $1,500 instead of $3,750. You saved $2,250 just by timing the sales together.
| Scenario | Without Harvesting | With Harvesting |
|---|---|---|
| Gain on Stock B | $25,000 | $25,000 |
| Loss on Stock A | Not claimed | ($15,000) |
| Taxable gain | $25,000 | $10,000 |
| Tax owed (15% rate) | $3,750 | $1,500 |
| Tax savings | – | $2,250 |
If you didn't sell Stock B, you'd just harvest the $15,000 loss and use $3,000 against ordinary income this year. The remaining $12,000 carries forward.
The Wash Sale Rule Changes Everything
Here's where most people trip. You can't sell a stock at a loss and buy it back immediately. The IRS blocks that with the wash sale rule. Buy the same or "substantially identical" security within 30 days before or after the sale, and the loss gets disallowed.
That's a 61-day window. Sell on June 15, 2026, and you can't buy that same stock from May 16 through July 15. The disallowed loss doesn't vanish – it adds to the cost basis of the replacement shares. But you lose the immediate deduction.
"Substantially identical" is broader than you think. Same stock in a different account? Wash sale. Options on the same stock? Often a wash sale. Stock of the same company in a different class? Could be. NerdWallet breaks down these rules with specific examples of what triggers the provision and what doesn't.
Smart Replacements That Avoid Wash Sales
You want to stay invested while harvesting the loss. Here's how.
- Sell one index fund, buy a different one. Sell an S&P 500 fund, buy a total market fund. Different enough to avoid wash sale, similar enough to maintain exposure.
- Sector rotation. Sell a tech stock, buy a different tech stock in the same industry. Not substantially identical if they're different companies.
- Wait 31 days, then repurchase. Simple, safe, but you're out of the market for a month. Risk if the stock rebounds.
- Buy a similar security first, then sell the loser 31 days later. You maintain exposure, but you need the cash to double up temporarily.
The wash sale rule doesn't apply across asset classes. Sell a stock at a loss, buy bonds or real estate. No problem. Different securities entirely.
When Tax Loss Harvesting Makes the Most Sense
Market volatility creates opportunities. State Street points out that down markets offer the richest harvesting environment, but you can find losses in any year if you're looking.
Year-end is traditional timing. Harvest losses in December, offset the year's gains. But waiting until December means you might miss opportunities. A stock that's down in March might recover by November.
Quarterly reviews catch more losses. Check your portfolio every three months. Harvest when you see material losses, not just in December. You want the deduction in the year you need it most.
Who Benefits Most
You're a strong candidate if you have:
- Realized capital gains this year from stock sales, real estate, or business assets
- High ordinary income that puts you in a top tax bracket
- A portfolio with both winners and losers, not everything moving the same direction
- Concentrated positions you want to diversify anyway
Business owners who sold assets or took distributions fit this profile perfectly. You've got the gains, you've got the tax rate exposure, and you probably have investment accounts that haven't been optimized for years.
If you're already in the 0% capital gains bracket (taxable income under $47,025 for singles, $94,050 for married filing jointly in 2026), tax loss harvesting delivers less value. You're not paying capital gains tax anyway.
Account Types and Planning Restrictions
Tax loss harvesting only works in taxable accounts. Regular brokerage accounts where you pay tax on gains each year. Not retirement accounts.
IRAs, 401(k)s, and other qualified plans don't generate taxable events. You can sell at a loss inside those accounts, but there's no deduction. You can sell at a gain, but there's no current tax. Everything's deferred until withdrawal, so harvesting serves no purpose.
This limitation affects your overall strategy. Keep investments with high turnover or expected losses in taxable accounts. Put buy-and-hold growth stocks in retirement accounts where they can compound without annual tax drag.
Coordinating Across Multiple Accounts
Wash sale rules apply across all accounts you control, even retirement accounts. Kiplinger addresses this complexity, noting that buying the same security in your IRA within 30 days of selling it at a loss in your taxable account triggers a wash sale.
That replacement purchase in the IRA adds to basis? No. The loss just disappears because IRAs don't have basis tracking the same way. You get nothing.
Track everything. Spreadsheet, software, whatever system works. Mark the dates you harvest losses, note the 61-day windows, and check every account before you buy.
Advanced Strategies for Business Owners
You sold part of your business this year. Capital gain of $500,000. Your advisor says congratulations, pay the tax. I say not yet.
Review every investment account, partnership interest, and rental property. Harvest every loss you can find. That $40,000 stock position that tanked? Sell it. The $75,000 in a struggling fund? Harvest it. Stack those losses against your business sale gain.
Layer this with other planning moves. Timing matters when you're dealing with large gains. Financial Planning Authority discusses how tax loss harvesting integrates with installment sales, charitable contributions, and retirement contributions to build comprehensive tax plans.
Qualified Small Business Stock and Loss Harvesting
Sold Qualified Small Business Stock (QSBS) and excluded the gain under Section 1202? You might think harvesting losses is pointless. Not true. You can still use harvested losses against other gains and ordinary income.
If you have QSBS gains and other investment gains in the same year, harvest losses to offset the non-excluded gains. The QSBS exclusion (up to $10 million or 10 times basis) protects those gains. Use your harvested losses where they'll actually reduce tax.
Short-Term vs. Long-Term Considerations
The character of your losses matters. Short-term capital losses (from assets held one year or less) are worth more if you have short-term gains. Those gains face ordinary income rates, up to 37% in 2026. Long-term losses offset long-term gains taxed at preferential rates (0%, 15%, or 20%).
Match the character when you can. Trading stocks frequently? You're generating short-term gains. Harvest short-term losses to offset them. Your tax savings per dollar of loss is higher.
But don't let the tail wag the dog. If you have a long-term loss worth taking and only short-term gains, take it anyway. The loss will offset those gains just fine, and any excess carries forward to use however needed in future years.
| Loss Type | Best Used Against | Tax Rate Avoided | Planning Priority |
|---|---|---|---|
| Short-term | Short-term gains | Up to 37% | Highest value |
| Short-term | Long-term gains | 0% to 20% | Good |
| Long-term | Long-term gains | 0% to 20% | Matched well |
| Long-term | Short-term gains | Up to 37% | Also works |
Implementation Mechanics and Documentation
You don't report tax loss harvesting separately. It flows through Schedule D and Form 8949 like any other capital transaction. Your broker sends Form 1099-B showing sales proceeds and basis. You report the sales, calculate the gains and losses, net everything together.
The broker doesn't know your tax strategy. They report what you sold and what you bought. They might flag wash sales if everything's in one account, but if you've got accounts at multiple firms, you're responsible for tracking.
Keep records of every harvest: the security sold, date sold, proceeds, basis, loss claimed. Note what you bought as a replacement and when. If the IRS ever questions the loss, you'll need to prove it wasn't a wash sale.
SmartAsset provides detailed guidance on the documentation and reporting requirements, including how wash sales appear on your 1099-B and what adjustments you need to make.
Working With Tax Professionals
Your CPA should know about every loss harvest before they prepare your return. Mid-year harvesting is fine, but communicate it. They need to track your capital loss carryforwards and plan estimated payments.
Most CPAs won't proactively suggest harvesting. They'll report what happened, not strategize what should happen. That's where planning separates from compliance. If your tax preparer isn't asking about your portfolio losses, they're missing opportunities.
Better approach: integrate investment management with tax planning. Review your portfolio with tax implications in mind quarterly. Make harvesting decisions based on your full financial picture, not just investment performance.
Common Mistakes That Destroy Value
Harvesting tiny losses isn't worth the effort. $200 loss saves you $50 to $75 in tax. If you're paying trading commissions or dealing with complicated replacement purchases, the administrative cost might exceed the benefit.
Focus on material losses. $5,000 or more creates meaningful deductions. Batch smaller losses together if you're rebalancing anyway, but don't chase $300 harvests.
Forgetting about state taxes compounds mistakes. Your state might not conform to federal capital gains rules. Some states tax long-term gains at ordinary rates. Others don't allow the $3,000 ordinary income deduction. Check your state's treatment before assuming harvested losses provide the same benefit.
The Reinvestment Timing Trap
You harvest a loss, wait 31 days to avoid the wash sale, and buy back in. The stock's up 20%. You saved $2,000 in tax but missed $10,000 in gains. Planning failure.
This risk is real, but manageable. Buy a similar security immediately to maintain exposure. You're not out of the market, just shifted positions. Or accept that staying invested matters more than harvesting every possible loss.
Becker emphasizes that tax planning should enhance your investment strategy, not override it. Don't sacrifice investment returns to save taxes. Find the balance that preserves both.
Integrating Harvesting Into Year-Round Planning
Tax loss harvesting isn't a December scramble. It's a year-round discipline that fits into quarterly planning reviews. You're already tracking business income, estimated payments, and retirement contributions. Add portfolio loss harvesting to that checklist.
March review: First quarter earnings known, estimated tax deadline approaching. Harvest losses if you've realized unexpected gains or business income is higher than projected.
June review: Half the year complete. Adjust harvesting strategy based on actual results versus forecast. If you're trending toward higher income, accelerate loss harvesting.
September review: Final quarter to make moves. Identify positions you'll definitely want to harvest by year-end, but don't wait if losses are available now.
December review: Last chance execution. Harvest remaining losses, but verify you haven't triggered wash sales with purchases earlier in the quarter.
This quarterly cadence keeps you nimble. Markets change, your business results change, tax law changes. Regular reviews let you adapt instead of reacting too late.
Business owners face lumpy income. Taxt helps clients navigate these variations with proactive planning that anticipates changes instead of just reporting them. Tax loss harvesting is one tool among many that work better when applied systematically throughout the year, not as a year-end afterthought.
When Not to Harvest
Sometimes the loss isn't worth taking. You bought stock in a company you believe in long-term. It's down 30%, but you think it'll recover. Selling triggers the loss but also forces you to either stay out 31 days or buy something different.
If your investment thesis is still intact, holding might be smarter. The tax deduction is certain, but so is giving up your position. Weigh the tax benefit against the opportunity cost.
Estate planning changes the calculation. Assets you own at death get a step-up in basis. Your heirs inherit at fair market value on your date of death, and any losses you were carrying disappear. If you're holding losing positions and you're in your 80s, harvesting might not make sense. Your beneficiaries will inherit at the lower value with no tax on the decline.
Gifting creates another exception. Give a losing stock to charity and you can't deduct the loss. You can only deduct the current fair market value, which is lower. Better to sell the stock, take the loss, and give cash. You get both the loss deduction and the charitable deduction.
Recent Changes and 2026 Planning
Tax rates stayed consistent from 2025 to 2026. Long-term capital gains still face 0%, 15%, or 20% rates depending on income. The 3.8% net investment income tax still applies to high earners. Inflation adjustments shifted the brackets slightly upward, but strategy remains the same.
What changed is opportunity. Market volatility in late 2025 created positions trading below basis. If you bought tech stocks in early 2025 and they corrected 25% by fall, you've got harvestable losses entering 2026.
The $3,000 ordinary income deduction limit hasn't changed since 1978. Every other tax provision adjusts for inflation, but this one stays frozen. That means its value erodes over time. Another reason to prioritize harvesting against capital gains when possible, not just relying on the ordinary income deduction.
Tax loss harvesting turns market downturns into tax savings, letting you offset gains and reduce your overall tax bill while maintaining your investment strategy. The rules are specific, the opportunities are time-sensitive, and the integration with business planning requires attention most CPAs won't provide. Taxt builds tax loss harvesting into year-round planning strategies that coordinate your investments, business income, and retirement contributions into one comprehensive approach with a money-back guarantee if we don't find you savings.
