Tax-Loss Harvesting: A Practical Guide to Reducing Investment Taxes

Tax-loss harvesting is the practice of selling an investment in a taxable account at a loss so the realized loss can offset tax exposure. Up to $3,000 of excess net losses may generally be used to offset ordinary income. During times of market volatility, tax-loss harvesting can be a valuable strategy to decrease your tax risk.

Since an unrealized loss does not create a deduction until the position is sold, tax-loss harvesting should only be done with careful planning. The goal is not to merely sell investments that have declined, but to decrease tax exposure by coordinating your tax objectives with your portfolio plan.

Key Takeaways:

• Tax-loss harvesting generally applies to taxable accounts.
• Losses first offset gains through prescribed short-term and long-term netting rules.
• Up to $3,000 of excess net loss may generally offset ordinary income, or $1,500 if married filing separately.
• The wash-sale rule and future cost basis can affect whether the expected benefit is realized.

What is Tax-Loss Harvesting?

Tax-loss harvesting is the purposeful decision to sell an investment in a taxable account at a loss so you can claim a deduction against other investment gains. An investment decline alone does not produce a tax deduction. Instead, when you sell your investment at a loss, it becomes a “realized” loss and may qualify. Investments that are losses only on paper are “unrealized” losses and do not count toward a deduction.

Your tax-loss strategy must remain subordinate to your risk tolerance, allocation, time horizon, and financial plan.

What Tax-Loss Harvesting Can and Cannot Do

Tax-loss harvesting can potentially:

• Offset realized capital gains
• Reduce a limited amount of ordinary income
• Create a carryforward
• Support tax-aware rebalancing
• Improve timing of tax payments

Tax-loss harvesting cannot:

• Recover investment losses
• Guarantee a lower lifetime bill
• Guarantee higher returns
• Make an unsuitable investment decision appropriate
• Eliminate the need for wash-sale monitoring

Taxable Accounts Versus Retirement Accounts

Tax-loss harvesting generally utilizes taxable brokerage accounts. Because retirement accounts like 401(k)s and IRAs are tax-advantaged, losses generated by trades are not deducted as taxable-account capital losses.

If you realize a taxable loss and then make an IRA or Roth IRA replacement purchase, it can cause a wash sale and be more costly in the long run.

How Does Tax-Loss Harvesting Work?

Step 1: Review Unrealized Losses and Cost Basis

Review your taxable accounts and identify each tax lot. Multiple purchases, dividend reinvestments, and stock awards may create separate lots. Include your cost basis, which is the original value of an asset adjusted for capital distributions, dividends, and stock splits.

Specific lot identification allows you to choose strategically which investments you sell at a loss and which ones you hold on to. Note that the chosen lot you want to sell should be confirmed with the custodian or broker.

Step 2: Calculate Short-Term and Long-Term Positions

Within the selected lot, calculate your net short-term asset position and your net long-term asset position. Short-term generally means assets held for one year or less. Long-term generally means assets held for over a year. Net each holding-period category separately, then combine the resulting net short-term and long-term amounts as required.

Step 3: Sell and Reinvest Without Abandoning the Portfolio Plan

Allowing funds to remain in cash can introduce unintended market-timing risk, so consider purchasing an investment with a similar portfolio purpose or exposure. Your new investment should be discussed with a professional, as a “similar” investment is not the same as an automatically approved wash-sale substitute.

Step 4: Document and Monitor the Transaction

Make sure you track:

• Sale date
• Acquisition date and tax lot
• Cost basis
• Realized loss
• Replacement investment
• Replacement purchase date
• Purchases during the preceding 30 days
• Purchases during the following 30 days
• Any spouse, IRA, Roth IRA, DRIP, stock-award, or recurring-investment activity

Tax-Loss Harvesting Rules and Limits

How Capital Gains and Losses Are Netted

1. Short-term gains are calculated
2. Short-term losses are calculated and the net loss is calculated
3. Long-term gains are calculated
4. Long-term losses are calculated and the net loss is calculated
5. There is cross-netting between the two resulting categories
6. Up to $3,000 of valid losses can go towards an ordinary-income deduction
7. The remaining total net losses are put towards a carryforward for future years.

The $3,000 Capital-Loss Deduction

There is a $3,000 federal limit on losses that can be used on ordinary income. If you are married filing separately, you will have a $1,500 limit. These limits apply after gains and losses have been netted.

Note: This limit applies to losses used to offset ordinary income. It is not a $3,000 limit on losses that can be used against capital gains. There is currently no limit on losses that can be used to offset capital gains.

How Capital-Loss Carryforwards Work

Net losses over $3,000 generally carry forward to future years, and they retain their short-term or long-term character. The ultimate value of the carryforwards depends on future gains, future income, and future tax rates.

How the Wash-Sale Rule Works

A wash sale generally occurs when an investor sells stock or securities at a loss and acquires the same or substantially identical investment during the 30 days before or 30 days after the sale.

The 61-Day Wash-Sale Window

The monitoring period consists of:

• 30 calendar days before the sale
• The sale date
• 30 calendar days after the sale

Purchases before and after your sale can trigger the rule, so be sure to monitor investments before selling at a loss.

What Does “Substantially Identical” Mean?

The IRS has a facts-and-circumstances standard that is often left intentionally vague. However, one clear example is if you buy back the exact stock you sold within 30 days. Another clear example is if you bought stocks of one company, and then within 30 days, sold older stocks of that same company at a loss.

However, options and contracts can make wash sales more complicated. Simply buying stocks of a different company will not protect you from a wash sale. If you’re unsure about an unclear replacement investment, work with a tax professional.

Wash Sales Across Accounts and Households

Wash sales aren’t triggered solely by a brokerage account. Wash-sale rules apply across all your accounts, including IRAs, 401(k)s, and spousal accounts.

Wash sales can be triggered by:

• Another taxable brokerage account
• The investor’s IRA
• The investor’s Roth IRA
• A spouse’s acquisition
• A controlled corporation where relevant
• Transactions at another custodian
• Automatic purchases

Why an IRA or Roth IRA Wash Sale Can Be More Costly

Accidentally triggering a wash sale with your IRA can be extra costly for two reasons:

1. Taxable-account replacement: The disallowed loss is generally added to the replacement security’s basis, postponing the deduction.
2. IRA or Roth IRA replacement: The taxable-account loss is disallowed, and the basis of the IRA or Roth IRA is not increased.

Hidden Wash-Sale Triggers:

• Dividend reinvestment
• Recurring purchases
• Employee stock awards
• Restricted stock vesting or company-stock activity
• Options or contracts
• Purchases by a spouse
• Purchases at a second brokerage
• Purchases during the 30 days preceding the sale

Who Is Most Likely to Benefit From Tax-Loss Harvesting?

Situations That May Increase Potential Value:

• Significant realized short-term gains
• Significant taxable long-term gains
• High current marginal tax rates
• Potential net investment income tax
• State capital gains or income taxes
• A large taxable investment portfolio
• Portfolio rebalancing needs
• Concentrated stock exposure
• Stock compensation
• Expected mutual-fund capital-gain distributions
• Ongoing taxable contributions that create multiple tax lots
• A long-expected period before the replacement investment is sold

Situations in Which the Strategy May Offer Limited Value:

• The investor holds assets only in retirement accounts
• The gain being offset would otherwise fall within the 0% long-term capital-gains rate
• The investor expects a materially higher future tax rate
• Trading costs or tracking error are significant
• The replacement investment does not fit the plan
• The investor needs to repurchase the same investment inside the wash-sale window
• The harvested loss is too small to justify the complexity
• Existing loss carryforwards already exceed realistically expected gains

Seven Smart Tax-Loss Harvesting Tips

1. Monitor Opportunities Throughout the Year

   Waiting until December can reduce flexibility, as market volatility influences stocks. Periodic tax review, especially during high market volatility, can help you use losses effectively.

2. Use Specific Lot Information Before Selling

   Review the basis and holding period of each lot and select the lot deliberately when permitted and appropriate. Confirm the default disposal method with your broker and retain confirmation of the lot-selection instruction.

3. Coordinate Automatic and Household Purchases

Before realizing losses, review:

• DRIPS
• Recurring investment plans
• IRA contributions
• Roth IRA contributions
• Spousal accounts
• Employee stock activity
• Other brokerage platforms

4. Maintain the Intended Market Exposure 

   A replacement investment is meant to help you maintain market exposure, but its results are not guaranteed. Investment replacements depend on allocation, risk, expected exposure, costs, and tracking differences. You must also ensure that your replacement investment does not trigger a wash sale.

5. Review Gains Beyond the Immediate Brokerage Account

Look beyond your brokerage account when reviewing your net gains. Consider:

• Other taxable investment accounts
• Mutual funds capital-gain distributions
• Stock-compensation sales
• Other transactions producing capital gains
• Existing loss carryforwards

Character and deductibility rules can vary for business, real estate, partnership, or other nonstandard transactions.

6. Calculate the Net Benefit, Not Just the Harvested Loss

Beyond your capital gains, harvesting losses could have extra benefits. When considering tax-loss harvesting, evaluate:

• Tax rate avoided today
• Potential tax rate later
• Net Investment Income Tax (NIIT)
• State taxes
• Trading costs
• Bid-ask spreads
• Tracking error
• Portfolio consequences
• Expected holding period
   

7. Consider Direct Indexing or Automated Monitoring Where Appropriate 

Owning individual securities may create more loss-harvesting opportunities than owning a single pooled fund. While automated systems may help monitor opportunities, they may not see a spouse’s holdings or assets at another provider. Automation can be a powerful tool, but it does not eliminate the need for tax oversight.

Tax-Loss Harvesting Versus Tax-Gain Harvesting

An investor in the 0% long-term capital-gains band should compare the two strategies rather than assuming loss harvesting is automatically preferable.

How to Report Tax-Loss Harvesting on a Tax Return

1. Review Form 1099-B from the brokerage.
2. Reconcile proceeds, basis, holding period, and adjustments.
3. Report applicable transactions on Form 8949.
4. Summarize capital gains and deductible losses on Schedule D.
5. Track any capital-loss carryforward.

Do Not Assume the Broker Identified Every Wash Sale

Brokerage reporting may not capture every transaction involving:

• Another account
• A spouse
• A different custodian
• An IRA or Roth IRA
• A related but potentially substantially identical investment
• Employee compensation activity

What Is the Tax-Loss Harvesting Deadline?

A loss must be realized within the relevant tax year. The regular-way exchange-traded stock sales generally follow the trade date for determining the year. Short sales and special transactions can follow different rules.

Complete your transactions before the final trading session rather than relying on a last-minute order to reduce the likelihood of missing deadlines. Remember that wash sales can extend into the following year if your sale date is in December.

Records to Keep

For an easier reporting experience, keep track of:

• Trade confirmations
• Cost-basis records
• Tax-lot instructions
• Purchase and sale dates
• Replacement-security details
• Wash-sale adjustments
• Carryforward worksheets
• Relevant communications with the custodian or advisor

Is Tax-Loss Harvesting Worth It?

Tax-loss harvesting can help decrease your tax exposure and use market volatility strategically. However, selling assets at a loss could mean losing money in the long run if you sell the wrong lot. Tax-loss harvesting should only be done with careful consideration and by consulting a professional.

Questions to Ask Before Harvesting a Loss:

• What gain or income will the loss offset?
• What tax rate would apply without the harvest?
• Could NIIT or state taxes apply?
• Is there an existing capital-loss carryforward?
• Will the investor remain appropriately invested?
• Is the replacement potentially substantially identical?
• Are there automatic or spousal purchases to coordinate?
• What is the expected future tax rate?
• What costs or tracking differences will the trade introduce?
• Does the trade support the long-term investment plan?

Advisor Coordination:

Tax-loss harvesting is most effective when your advisor and tax professional can review:

• Investment accounts
• Existing gains and losses
• Tax-loss carryforwards
• Stock compensation
• Expected income
• Charitable and estate objectives
• Portfolio allocation

Coordinate Tax and Investment Decisions Before Acting

Tax-loss harvesting is a tax and portfolio decision, not just a year-end trade. While the strategy may be useful for certain years, it is not universally beneficial. Before realizing losses, review your complete tax picture and portfolio plan. If you’re curious about how tax-loss harvesting fits into your plan, consult with a Wealth Enhancement advisor today.

Frequently Asked Questions About Tax-Loss Harvesting

What is tax-loss harvesting?

Tax-loss harvesting is the practice of purposefully selling investments at a loss to claim tax deductions that offset capital gains and ordinary income.

Can tax-loss harvesting help if I do not have capital gains?

Sometimes. Tax losses can be applied to ordinary income up to $3,000. If you have more than $3,000 in losses, the amount can be carried forward and applied to income in future years.

What is the 61-day wash-sale window?

The 61-day wash-sale window refers to the 30 days before the sale, the sale date, and the 30 days after the sale, during which purchases of “substantially identical” investments can trigger a wash sale.

How long must I wait before buying the same investment back?

You must wait until at least 30 days after the sale, meaning day 31 or later. You should also check purchases made during the preceding 30 days to ensure that a wash sale will not be triggered.

Does the wash-sale rule apply across different accounts?

Yes. A wash-sale can be triggered by other brokerage accounts, retirement accounts like IRAs and 401(k)s, and spousal purchases. After selling your investments at a loss, coordinate arrangements with a tax professional to avoid a potential wash-sale.

What is the tax-loss harvesting deadline?

Losses must be realized within the calendar year, and most stock sales will follow standard trade-date rules. Short sales and special transactions may follow different guidelines.

Can tax-loss harvesting be used with ETFs and mutual funds?

It depends. Losses can potentially be realized on eligible securities in taxable accounts, but replacement-fund selection and substantially identical analysis require care.

How do I report tax-loss harvesting?

There are three forms you need to review: Form 1099-B, Form 8949, and Schedule D. Review Form 1099-B from your broker, report applicable transactions on Form 8949, and summarize capital gains and deductible losses on Schedule D.

This information is not intended to provide individualized tax or legal advice. Discuss your specific situation with a qualified tax or legal professional.

There is no guarantee that asset allocation or diversification will enhance overall returns, outperform a non-diversified portfolio, nor ensure a profit or protect against a loss. Investing involves risk, including possible loss of principal. This article was originally published on 12/10/2025 and has been updated.

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