Tax-Loss Harvesting: Simple Guide

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Mar 22, 2026

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Tax-loss harvesting lowers your tax bill by selling losing investments to offset gains. Learn how it works and if it's right for you.

What Exactly Is Tax-Loss Harvesting?

Let's break it down. Basically, it's a technique investors use to minimize their capital gains taxes. When you sell an investment for a profit, that profit is considered a capital gain and is subject to taxes. However, if you sell an investment for a loss, that loss can be used to offset those gains. Tax-loss harvesting is the process of intentionally realizing these losses to reduce your overall tax liability.

The Core Idea: Offsetting Gains with Losses

Imagine you sold some stock this year and made a $5,000 profit. Congrats! That's awesome. But Uncle Sam wants his cut. Now, let's say you also have another investment that hasn't performed so well and is currently sitting at a $2,000 loss.

This is where tax-loss harvesting comes into play. You can sell that losing investment, realize the $2,000 loss, and use it to offset $2,000 of your $5,000 gain. Now you only owe taxes on $3,000 of capital gains. Pretty neat, huh?

The $3,000 Deduction Limit and Carryforward

What happens if your losses exceed your gains? Well, the IRS allows you to deduct up to $3,000 of those excess losses from your ordinary income each year. If your losses exceed both your gains and the $3,000 deduction limit, you can carry the remaining losses forward to future tax years. This means you can continue to use those losses to offset gains or deduct from your income in the years to come, until they're all used up.

For example, let's say you have $1,000 in capital gains and $8,000 in capital losses. You can offset the $1,000 gain completely, and then deduct $3,000 from your ordinary income. This leaves you with $4,000 in losses to carry forward to future years.

Why Should You Care About Tax-Loss Harvesting?

Okay, so you understand the basic concept. But why is this important for you as an investor? There are a few key reasons:

Lowering Your Tax Bill: This is the most obvious benefit. By offsetting capital gains with losses, you reduce the amount of taxes you owe.

Increasing Your After-Tax Returns: Lower taxes translate directly into higher after-tax returns. More money stays in your pocket to reinvest or use for other financial goals.

Potentially Delaying Taxes Indefinitely: By continually harvesting losses and carrying them forward, you might be able to defer paying taxes on your investment gains for years, even decades! This can be a huge advantage, especially if you anticipate being in a lower tax bracket in the future.

Opportunity to Rebalance Your Portfolio: Tax-loss harvesting can be a good excuse to rebalance your portfolio. If you have a sector that's underperforming, you can sell those holdings to harvest the loss and then reinvest the proceeds into a different asset class that aligns better with your investment strategy.

In my experience, a lot of people overlook this. I remember back in 2018, I was so focused on just making money that I completely ignored the tax implications. I ended up paying way more in taxes than I needed to. That's when I started diving deep into strategies like tax-loss harvesting, and it's made a significant difference in my long-term investment returns.

Avoiding the Wash-Sale Rule

Now, there's a key rule you need to be aware of: the wash-sale rule. The IRS doesn't want people simply selling an investment to realize a loss and then immediately buying it back to maintain their position.

The wash-sale rule states that you cannot repurchase the same security (or a "substantially identical" one) within 30 days before or after selling it for a loss. If you do, the loss is disallowed, and you can't use it to offset capital gains. The disallowed loss is then added to the cost basis of the new shares, which affects your capital gain or loss when you eventually sell those shares.

What qualifies as "substantially identical?"

This generally includes the same stock or bond.

It can also include options on the same stock.

Investing in very similar ETFs can potentially trigger the rule, so be careful. For example, selling an S&P 500 ETF and immediately buying a different S&P 500 ETF could be considered a wash sale, though this is a gray area that the IRS hasn't clarified extensively and many believe doesn't violate the rule.

How to Avoid the Wash-Sale Rule:

Wait 31 Days: The simplest way to avoid the wash-sale rule is to wait at least 31 days before repurchasing the same security.

Buy a Similar, But Not Identical, Investment: You could invest in a similar sector or asset class without violating the wash-sale rule. For example, if you sell a large-cap growth stock at a loss, you could invest in a small-cap growth stock or a different company in the same industry.

Consider Tax-Advantaged Accounts: The wash-sale rule does not apply to sales within tax-advantaged accounts like 401(k)s and IRAs. However, be careful if you're selling at a loss in a taxable account and then buying the same security in a tax-advantaged account within that 30-day window. The IRS could still disallow the loss.

Tax-Loss Harvesting Example

Let’s solidify the concept with a concrete example, using projected tax rates for 2026, assuming no changes to tax law. Imagine you're single, and your taxable income puts you in the 15% long-term capital gains tax bracket.

You sold Stock A for a profit of $8,000.

You sold Stock B for a loss of $3,000.

You also sold Stock C for a loss of $2,000.

Without Tax-Loss Harvesting:

You would owe capital gains tax on the full $8,000 profit. At a 15% tax rate, that would be $1,200 in taxes.

With Tax-Loss Harvesting:

You can use the $3,000 loss from Stock B and the $2,000 loss from Stock C to offset the $8,000 gain from Stock A. This reduces your taxable capital gains to $3,000 ($8,000 - $3,000 - $2,000).

Your capital gains tax would now be $450 (15% of $3,000), saving you $750 in taxes!

How to Implement Tax-Loss Harvesting

So, how do you actually put tax-loss harvesting into practice? Here's a step-by-step guide:

Review Your Portfolio Regularly: Check your portfolio periodically to identify investments that have unrealized losses. I personally check mine quarterly, but you can do it more or less frequently depending on your investment style.

Determine if Selling Makes Sense: Just because an investment has a loss doesn't automatically mean you should sell it. Consider the underlying reasons for the loss. Is it a temporary market fluctuation, or is there a fundamental problem with the investment? If you still believe in the long-term prospects of the investment, you might want to hold on to it.

Calculate Your Capital Gains and Losses: Before selling anything, figure out your total capital gains and losses for the year. This will help you determine how much loss you need to harvest to offset your gains.

Sell the Losing Investments: Once you've identified the investments you want to sell, execute the trades.

Be Mindful of the Wash-Sale Rule: As we discussed earlier, be careful not to repurchase the same security (or a substantially identical one) within 30 days before or after the sale.

Reinvest the Proceeds: After selling the losing investments, reinvest the proceeds into other assets that align with your investment strategy. This could involve buying similar but not identical investments, diversifying into other sectors, or simply rebalancing your portfolio.

Track Your Transactions: Keep detailed records of all your sales, including the date, price, and security sold. This information is essential for accurately reporting your capital gains and losses on your tax return.

Consult with a Tax Professional: If you're unsure about any aspect of tax-loss harvesting, it's always a good idea to consult with a qualified tax professional. They can help you develop a personalized strategy that aligns with your specific financial situation.

Software That Can Help Automate Tax-Loss Harvesting

Several robo-advisors and investment platforms offer automated tax-loss harvesting services. These platforms use algorithms to identify potential tax-loss harvesting opportunities and automatically execute the trades on your behalf.

Some popular options include:

Betterment: Betterment offers automated tax-loss harvesting as part of its standard investment management service.

Wealthfront: Wealthfront also provides automated tax-loss harvesting and offers additional tax-optimization strategies like tax-location optimization.

Personal Capital: Personal Capital (now Empower) provides a comprehensive financial dashboard that includes tax-loss harvesting analysis and recommendations.

Schwab Intelligent Portfolios: Schwab's robo-advisor offers automated tax-loss harvesting for taxable accounts.

These platforms can save you time and effort by automating the tax-loss harvesting process. However, it's still important to understand the underlying principles and monitor your account regularly.

Tax-loss harvesting isn't about avoiding taxes altogether; it's about strategically managing them to maximize your investment returns. It's a powerful tool that, when used correctly, can significantly improve your financial outcomes over the long term. Don't let the jargon intimidate you – take the time to understand the basics, and you'll be well on your way to becoming a more tax-savvy investor.

Disclaimer: This article is for informational purposes only and does not constitute financial advice. Some links may be affiliate links.

Tax-Loss Harvesting: Simple Guide

What Exactly Is Tax-Loss Harvesting?

The Core Idea: Offsetting Gains with Losses

The $3,000 Deduction Limit and Carryforward

Why Should You Care About Tax-Loss Harvesting?

Avoiding the Wash-Sale Rule

Tax-Loss Harvesting Example

How to Implement Tax-Loss Harvesting

Software That Can Help Automate Tax-Loss Harvesting

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Written and maintained by Alex Jordan

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