Tax-Loss Harvesting: Complete Strategy Guide

What Is Tax-Loss Harvesting?

Tax-loss harvesting is a tax strategy where you sell investments that have declined below your purchase price (cost basis), realize the capital loss for tax purposes, and then use that loss to reduce your tax bill. The key is that you typically reinvest the proceeds in a similar -- but not identical -- investment, so your overall portfolio allocation stays roughly the same.

The Basic Mechanism

The process works in five steps:

1. Identify investments in your taxable brokerage account that have declined below your cost basis
2. Sell the losing position to realize the capital loss
3. Use the loss to offset capital gains from other investments you sold at a profit
4. Deduct excess losses -- if losses exceed gains, deduct up to $3,000 against ordinary income
5. Reinvest the proceeds in a similar (but not "substantially identical") investment to maintain your market exposure

Why Tax-Loss Harvesting Works: A Worked Example

Suppose you are a single filer with $100,000 in ordinary income. During the year, you sold Stock A for a $10,000 long-term capital gain. You also hold Stock B, which has a $6,000 unrealized loss.

By selling Stock B to realize the $6,000 loss, you reduce your taxable gain from $10,000 to $4,000, saving $900 in federal taxes. You then reinvest the proceeds from Stock B into a similar investment, maintaining your portfolio strategy. For a full breakdown of the capital gains rates that determine your savings, see our 2026 Capital Gains Tax Brackets guide.

If your gains had been short-term (taxed at your ordinary income rate of 22%), the same $6,000 harvested loss would have saved you $1,320 instead of $900. This is why harvesting short-term losses to offset short-term gains generally provides the largest tax benefit.

Important: Taxable Accounts Only

Tax-loss harvesting works only in taxable brokerage accounts. Losses realized in tax-advantaged accounts such as IRAs, 401(k)s, and HSAs provide no tax benefit because gains in those accounts are already tax-deferred or tax-free. If you are looking for other ways to reduce your tax burden in retirement accounts, consider a Roth conversion strategy instead.

The Wash Sale Rule: The Critical Constraint

The biggest pitfall in tax-loss harvesting is the wash sale rule. Violating it means your loss gets disallowed, defeating the purpose of the strategy. Understanding this rule is essential before you harvest any losses.

What the Wash Sale Rule Says

Under IRC Section 1091, you cannot deduct a capital loss if you purchase a "substantially identical" security within 30 days before or after the sale. This creates a 61-day window: 30 days before the sale + the sale date itself + 30 days after.

If the wash sale rule is triggered:

• The loss is disallowed for tax purposes in the current year
• The disallowed loss is added to the cost basis of the replacement shares (so the loss is deferred, not permanently lost)
• The holding period of the original shares carries over to the replacement shares

Critical details many investors miss:

• The rule applies across all your accounts -- you cannot sell in your brokerage account and buy in your IRA
• The rule applies to your spouse's accounts as well (IRS Revenue Ruling 2008-5)
• Automatic dividend reinvestment (DRIP) purchases can trigger a wash sale if they occur within the 30-day window

What Is "Substantially Identical"?

The IRS has not published a precise definition of "substantially identical," but tax professionals generally apply these guidelines:

How to Avoid Wash Sale Violations

• Wait 31+ days before buying back the same security
• Buy a "similar but not identical" replacement immediately (see the swap table in Step 4 below)
• Disable DRIP on the security you plan to sell at least 30 days in advance
• Check all accounts -- including your spouse's IRA, your 401(k), and any other brokerage accounts

Step-by-Step Tax-Loss Harvesting Process

Follow these five steps to harvest losses correctly and avoid common mistakes.

Step 1: Identify Losing Positions

Review your taxable brokerage account for holdings with unrealized losses. Most brokerages show unrealized gain/loss in your portfolio view. Prioritize:

• Short-term losses first: These offset short-term gains taxed at your ordinary income rate (up to 37%), providing the largest tax benefit per dollar
• Larger losses: The tax savings must be meaningful relative to the time and complexity involved
• Cost basis method: Check whether your broker uses FIFO, specific identification, or average cost. Specific identification gives you the most control over which shares to sell

Step 2: Check for Wash Sale Risk

• Verify you have not purchased the same security in the past 30 days (in any account)
• Turn off DRIP for the security you plan to sell
• Decide your approach: wait 31 days to repurchase, or identify a replacement security now

Step 3: Sell the Losing Position

Execute the sale in your taxable brokerage account. Your broker will report the loss on Form 1099-B at tax time. Document the loss amount and whether it is short-term (held one year or less) or long-term (held more than one year).

Step 4: Reinvest in a Replacement

Immediately buy a similar but not substantially identical investment to maintain your market exposure. Here are common swap examples that most tax professionals consider safe:

After 31 days, you can switch back to your original fund if you prefer it. The important thing is to stay invested during the waiting period so you do not miss market gains.

Step 5: Track for Tax Filing

Keep records of the sale date, sale price, cost basis, loss amount, and replacement purchase details. At tax time:

• Your broker generates Form 1099-B with wash sale flags if applicable
• Report capital gains and losses on Schedule D and Form 8949
• Net your short-term and long-term gains and losses separately before combining them

The $3,000 Ordinary Income Deduction

One of the most valuable aspects of tax-loss harvesting is the ability to deduct net capital losses against ordinary income. If your total capital losses exceed your total capital gains for the year, you can deduct up to $3,000 of the excess against wages, salary, and other ordinary income. If you are married filing separately, the limit is $1,500.

How the $3,000 Deduction Works

In this example, you offset the $2,000 in gains entirely, deduct $3,000 against ordinary income in 2026, and carry the remaining $3,000 forward to 2027. At a 22% marginal ordinary income rate, the $3,000 deduction saves you $660 in taxes -- on top of any savings from offsetting your capital gains.

The $3,000 limit has not been adjusted for inflation since it was established in 1978. However, unused losses carry forward indefinitely, so large losses harvested in a single year can benefit you across multiple future tax years. For a look at the current ordinary income brackets that determine your savings, see our 2026 Federal Tax Brackets guide.

Tax-Loss Harvesting and Cryptocurrency

Cryptocurrency is treated as property by the IRS (Notice 2014-21), which means the same capital gains and loss rules that apply to stocks generally apply to digital assets. Tax-loss harvesting is available for crypto gains and losses in taxable accounts.

Crypto-Specific Considerations

• Taxable events: Every sale, trade, or exchange of cryptocurrency is a taxable event, including crypto-to-crypto swaps
• Holding period: Crypto held more than one year qualifies for long-term rates (0%, 15%, or 20%); crypto held one year or less is taxed as ordinary income
• Broker reporting: Starting in 2025, digital asset brokers are required to report transactions on Form 1099-DA under the Infrastructure Investment and Jobs Act

A common crypto tax-loss harvesting approach is to sell a losing crypto position and buy a different cryptocurrency to maintain exposure. For example, selling Ethereum at a loss and purchasing Solana keeps you invested in the crypto market while realizing the tax loss. Use our Capital Gains Calculator to estimate the tax impact of your crypto gains and losses.

Is Tax-Loss Harvesting Worth It?

Tax-loss harvesting can be a powerful tool, but it is not always the right move. Here is how to evaluate whether the strategy makes sense for your situation.

When Tax-Loss Harvesting Makes Sense

• You have significant capital gains to offset -- especially short-term gains taxed at ordinary income rates of 22%-37%
• You hold concentrated positions with large unrealized losses -- a market downturn creates natural harvesting opportunities
• You actively manage a diversified taxable portfolio -- more holdings means more potential swap opportunities
• You are in a high tax bracket -- the dollar savings are proportionally larger at higher marginal rates
• You are rebalancing anyway -- harvesting gives you a tax benefit on trades you would have made regardless

When It May Not Be Worth the Effort

• You are in the 0% long-term capital gains bracket -- with taxable income under $48,350 (single) or $96,700 (married filing jointly) for 2026, there is no long-term gains tax to offset
• Your portfolio has few losing positions -- this is a good problem to have, but it limits harvesting opportunities
• The losses are very small -- harvesting $200 in losses at a 15% rate saves only $30, which may not justify the effort of tracking wash sales
• The complexity exceeds the benefit -- if you have trouble tracking the 30-day windows across multiple accounts, the risk of wash sale violations may outweigh the savings

Tax-Loss Harvesting vs. Buy and Hold

An important nuance: tax-loss harvesting does not eliminate taxes -- it defers them. When you sell a losing position and buy a replacement at a lower price, the replacement has a lower cost basis. When you eventually sell the replacement at a gain, you will owe taxes on the larger gain.

However, deferral has real value. A dollar of taxes deferred today is a dollar that can compound in the meantime. Over a long time horizon, consistent tax-loss harvesting can add an estimated 0.5% to 1.5% in annual after-tax returns, according to research from major financial institutions. The exact benefit varies based on portfolio size, turnover, and market volatility.

Buy-and-hold remains a sound strategy on its own. Tax-loss harvesting is best understood as an optimization layer on top of a disciplined long-term investment approach -- not a replacement for it. For more strategies to reduce your capital gains liability, see our Capital Gains Tax Strategies 2026 guide.

When to Tax-Loss Harvest

While many investors associate tax-loss harvesting with year-end tax planning, opportunities can arise throughout the year.

Year-End Harvesting (October - December)

The most common approach. By Q4, you have a clearer picture of your annual gains and losses, and you can make strategic decisions before the December 31 tax year cutoff. This allows you to target the exact amount of losses needed to offset your realized gains.

Opportunistic Harvesting (Throughout the Year)

Market downturns create natural harvesting opportunities. A significant market correction in March, for example, may offer larger unrealized losses than a mild December dip. Harvesting during downturns can lock in bigger losses while the opportunity exists -- markets may recover before year-end.

Key Timing Considerations

• Trade settlement: Stock trades typically settle T+1 (one business day). Make sure your sale settles before December 31 to count for the current tax year
• Mutual fund distributions: Many mutual funds distribute capital gains in December. Harvesting losses before the distribution can offset those gains
• Year-end rebalancing: If you rebalance your portfolio annually, combine rebalancing with harvesting to minimize total trades

For context on what investment returns typically look like and when losses are most common, see our ROI Benchmarks by Investment Type guide. And to understand how your deferred tax savings can grow over time, try our Investment Calculator.