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Quick Answer
Tax-loss harvesting is a strategy that sells investments at a loss to offset capital gains and up to $3,000 of ordinary income each year. For an investor paying 37% short-term capital gains rates, every $1,000 of harvested loss can trim a $370 tax bill, without giving up long-term market exposure.
A tax-loss harvesting strategy is one of the few levers you can pull to lower your tax bill while staying fully invested. The IRS lets you use realized losses to cancel out realized gains, and if losses exceed gains, you can deduct up to $3,000 against ordinary income according to IRS Topic No. 409. Anything left over rolls to future years.
The mechanics are simple, but the payoff compounds. Pairing a harvesting discipline with a broader financial plan, one that accounts for your tax bracket, your other deduction strategies, and even Medicare premiums, turns an otherwise disappointing investment loss into cash in your pocket. Done right, this is not market-timing; it’s tax-engineered asset management.
Key Takeaways
- Net capital losses can offset up to $3,000 of ordinary income per year ($1,500 if married filing separately), with any excess carrying forward indefinitely, per IRS Topic No. 409.
- Short-term capital gains are taxed at rates up to 37% federally, making harvested short-term losses the most valuable type to capture, as outlined in IRS Publication 550.
- The wash-sale rule disallows a loss if you repurchase a substantially identical security within 30 days before or after the sale, across all accounts including your spouse’s, per IRS Publication 550.
- Wealthfront’s analysis of client data found the median tax benefit from automated harvesting was 4.2 times the advisory fee paid, as documented in its tax-loss harvesting white paper.
- Cryptocurrency is classified as property by the IRS, meaning the wash-sale rule generally does not apply, allowing you to sell at a loss and repurchase the same coin immediately, per IRS Notice 2014-21.
- Tax-loss harvesting applies only to taxable brokerage accounts; selling at a loss inside an IRA or 401(k) provides no tax benefit, as gains and losses in those accounts are tax-deferred or tax-free.
How Tax-Loss Harvesting Turns a Paper Loss into Real Savings
You sell a holding that has dropped below your cost basis, realize the capital loss, and immediately use the proceeds to buy a similar, but not identical, asset. The loss offsets capital gains generated elsewhere in your portfolio, dollar for dollar. If your losses outstrip your gains, up to $3,000 of the net loss can reduce your taxable ordinary income each year, as detailed in IRS Publication 550.
Short-term losses are the most valuable. The IRS requires that short-term losses first offset short-term gains, which are taxed at your ordinary rate, as high as 37% federally, before touching long-term gains taxed at lower rates. This means a short-term loss harvested in a year you booked a short-term gain can trigger significant tax savings instantly. Even if you have no gains, the $3,000 ordinary-income offset is worth roughly $900 in federal taxes for someone in the 30% bracket, before considering state taxes. High-tax states like California or New York layer on their own rates, so the combined benefit can be larger, but state rules on capital loss carryovers vary, so check your local tax code or talk to a professional.
The trick is staying invested. You replace the sold asset with one that maintains similar exposure so you don’t miss a rebound. In practice, that means swapping an S&P 500 ETF for a large-cap index fund from a different provider, or selling one semiconductor stock and buying another. The IRS’s wash-sale rule is the only real constraint here, and we’ll cover that in the next section. Before you start, it’s also worth understanding how your overall tax picture fits. If you’re already managing a complex return, overlooked self-employed deductions can stack with harvesting to widen your savings.
Key Takeaway: A tax-loss harvesting strategy converts unrealized losses into immediate tax reductions, allowing an investor to offset $3,000 of ordinary income annually while staying in the market through similar replacement assets, as detailed by IRS Publication 550.
The Wash-Sale Rule, Carryforwards, and Other Hard Barriers
The IRS will disallow a loss if you buy a “substantially identical” investment within 30 days before or after the sale, the wash-sale rule. The rule applies across all your accounts, including your spouse’s, and even in IRAs if you repurchase the same security. Most investors dodge it by swapping between funds that track different indexes or by holding a replacement stock that is not a perfect match. If you sell a Vanguard S&P 500 ETF for a loss and move the money into a Schwab Large-Cap ETF that follows a different benchmark, you keep the loss intact.
Where many get tripped up is the scope of that 30-day window. It covers trades in other brokerage accounts and accounts held by your spouse. A perfectly legal harvest in your taxable account can be nullified if your spouse’s IRA reinvests dividends into the same fund automatically within the window. Automated dividend reinvestment is a frequent culprit. If you plan to harvest losses regularly, coordinate across all accounts or turn off auto-reinvestment while you execute trades.
When net losses exceed net gains, you can deduct up to $3,000 of the excess against ordinary income each year, $1,500 if married filing separately. Any remaining loss carries forward indefinitely, documented on Schedule D. That means a single large loss during a downturn can shelter gains for years. Tracking those carryforwards is critical; you’ll need to pull them from prior tax returns and apply them in the correct sequence, first against current gains, then against ordinary income, then forward. If you’re already mapping out future income shifts, knowing your projected tax bracket for 2026 helps you decide when to accelerate harvesting or defer recognition of gains.
Key Takeaway: The wash-sale rule disallows a loss if you repurchase a substantially identical security within 30 days across all accounts, including your spouse’s, but indefinite loss carryforwards let unused losses offset gains in future years, as defined by IRS Topic 409.
Automated Tax-Loss Harvesting: Robo-Advisors That Do the Work
Several robo-advisors now handle tax-loss harvesting daily, scanning for losses across individual tax lots and automatically executing sales and replacement purchases. Wealthfront and Betterment are the most prominent. Wealthfront’s own analysis of client data found the median tax benefit from its automated harvesting was 4.2 times the advisory fee paid, a result documented in its tax-loss harvesting white paper. That ratio swings upward in volatile markets and for accounts funded with larger sums.
These services charge annual advisory fees, typically 0.25% of assets under management. An investor with $100,000 pays $250 per year. If the harvesting generates $1,050 in tax savings (4.2 × $250), the after-fee benefit is around $800. The math gets even better when you consider that automated harvesting captures intra-year losses that a manual investor might miss. A 30-basis-point annualized tax alpha premium, about three-tenths of a percent of additional after-tax return, as some institutional studies have found, compounds meaningfully over a decade.
But automated harvesting doesn’t eliminate the need for oversight. The bots cannot always avoid conflicts with your other accounts because they don’t see them. If you also hold an IRA or a spouse’s portfolio elsewhere, wash sales can still occur. And the strategy only applies to taxable accounts: retirement accounts like IRAs and 401(k)s are tax-deferred, so selling for a loss inside them provides no tax benefit, period. If you’ve been building a late-start retirement fund, keep your harvesting strictly in the taxable bucket.
| Robo-Advisor | Tax-Loss Harvesting Method | Annual Advisory Fee | Wash-Sale Monitoring Across External Accounts |
|---|---|---|---|
| Wealthfront | Daily direct indexing | 0.25% | No |
| Betterment | Continuous tax-loss harvesting+ | 0.25% | No |
| Schwab Intelligent Portfolios | Automated, requires $25,000 minimum for tax-loss harvesting | 0% advisory fee (but up to 0.28% in underlying fund fees) | No |
Before delegating, weigh the advisory fee against your expected tax savings. For a small portfolio under $25,000, manual harvesting with a free brokerage and a spreadsheet often suffices, and $250 in fees is a bigger drag. When you’re ready to scale up, a Roth IRA vs. traditional IRA assessment can inform your broader tax-planning mix, because the more tax diversification you have across account types, the more flexibility you have to harvest losses in taxable accounts without disrupting retirement contributions.
Key Takeaway: Automated tax-loss harvesting from robo-advisors like Wealthfront can generate tax savings 4.2 times the advisory fee in typical market conditions, but it applies only to taxable accounts and does not prevent wash sales across external holdings, as detailed in Wealthfront’s published analysis.
Crypto, High-Income Earners, and Retiree-Specific Tactics
Cryptocurrency presents a unique edge: the IRS treats it as property, not a security, so the statutory wash-sale rule generally does not apply. You can sell Bitcoin at a loss, lock in the capital loss, and repurchase the same asset minutes later, an avenue not available with stocks or ETFs. This is particularly powerful in a volatile asset class where double-digit percentage swings are common. A high-income earner who sells a losing crypto position can immediately offset short-term gains elsewhere without worrying about a 30-day window.
For high-bracket investors, the motivation to harvest accelerates. Short-term gains are taxed at up to 37%, plus state taxes, making each harvested short-term loss a direct offset against that top rate. Meanwhile, retirees with modified adjusted gross income (MAGI) near Medicare IRMAA thresholds can use harvesting to stay just below the surcharge line. IRMAA adds a monthly premium surcharge for Part B and Part D when MAGI crosses certain tiers, and sometimes as little as $1 of extra income triggers a hefty increase. Harvesting a few thousand dollars of losses can reduce MAGI and preserve a lower premium bracket.
One caution worth flagging: replacing a stock or fund that pays qualified dividends with a substitute that doesn’t, or that pays returns as non-qualified dividends, can inadvertently increase your ordinary income. Check the new holding’s dividend classification before the swap. If you want to track multi-year carryforwards without hiring a CPA, use your prior-year Schedule D and keep a running spreadsheet. It’s tedious but manageable.
Key Takeaway: Crypto’s exemption from wash-sale rules lets you repurchase the identical asset immediately, while high-income earners can offset 37% short-term gains and retirees can use harvesting to avoid Medicare IRMAA surcharges, strategies rooted in IRS treatment of digital assets as property and MAGI-based premium calculations.
Frequently Asked Questions
Does tax-loss harvesting work in an IRA or 401(k)?
No. Tax-loss harvesting only applies to taxable brokerage accounts because gains and losses inside tax-advantaged retirement accounts are tax-deferred or tax-free. Selling for a loss inside an IRA provides no tax benefit and can permanently lose the tax-advantaged space.
What triggers a wash sale if my spouse trades the same stock?
A wash sale occurs if you or your spouse repurchase a substantially identical security within 30 days before or after the sale, across any account either of you controls. Even a dividend reinvestment in a spouse’s IRA can nullify your harvested loss, so coordinate all household trades.
Can I harvest losses on cryptocurrency?
Yes, and the wash-sale rule generally does not apply to crypto because the IRS classifies it as property, not a security. You can sell at a loss and repurchase the same coin immediately, making crypto one of the most flexible assets for this strategy.
How much can I deduct in a single year?
Up to $3,000 of net capital losses can offset ordinary income for single and joint filers ($1,500 if married filing separately). Any excess carries forward indefinitely, usable against future gains and ordinary income.
Is paying for automated tax-loss harvesting worth the fee?
If you have a larger portfolio, often above $25,000, the tax savings frequently exceed the 0.25% advisory fee. Wealthfront’s data shows median savings around 4.2 times the fee, meaning many clients come out ahead, but smaller balances may not generate enough benefit to justify the cost.
Sources
- IRS, Topic No. 409: Capital Gains and Losses
- IRS, Publication 550: Investment Income and Expenses
- IRS, Publication 544: Sales and Other Dispositions of Assets
- Wealthfront, Tax-Loss Harvesting White Paper
- IRS, Net Investment Income Tax for Individuals, Estates, and Trusts
- Centers for Medicare & Medicaid Services, Medicare Costs at a Glance (IRMAA Thresholds)
- IRS, Notice 2014-21: IRS Guidance on Virtual Currency and Property Classification
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