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Most investors think of a losing investment as purely bad news. However, in a taxable brokerage account, a loss can be turned into a tax advantage – if you understand how to use it correctly.
Tax-loss harvesting is the practice of selling an investment that has declined in value, realizing the loss for tax purposes, and using that loss to offset gains elsewhere in your portfolio. The result may be a lower tax bill in the year you harvest, or a loss carryforward that can reduce taxable gains in future years.
This guide explains how tax-loss harvesting works with ETFs, why the wash-sale rule matters, and how to think about whether this strategy applies to your situation. For the broader framework on how ETFs are taxed, see ETF Taxes Explained. For the structural basics of the taxable account this strategy applies to, see Taxable Brokerage Account Explained. This strategy applies to a standard cash account just as it does to a margin account – for how the two differ, see Cash Account vs. Margin Account.
What Is Tax-Loss Harvesting?
Tax-loss harvesting means deliberately selling an investment at a loss to generate a tax deduction. In the U.S., capital losses can offset capital gains dollar for dollar. If you have no gains to offset, losses can also reduce your ordinary income by up to $3,000 per year. Any losses beyond that limit can be carried forward to future tax years.
For example, suppose you hold two ETFs in a taxable account. ETF A is up $5,000. ETF B is down $5,000. If you sell both in the same tax year, the $5,000 gain and the $5,000 loss cancel each other out. As a result, you owe no net capital gains tax for that year – even though one of your positions had a significant gain.
The key word is “realize.” A loss that exists on paper but has not been sold does not create a tax deduction. Tax-loss harvesting requires actually selling the losing position.
Why ETFs Work Well for Tax-Loss Harvesting
ETFs are particularly well-suited to tax-loss harvesting for one practical reason: there are often similar – but not identical – ETFs tracking slightly different indexes in the same category. That matters because of the wash-sale rule.
With individual stocks, harvesting a loss and maintaining exposure is difficult – if you sell Apple and buy Apple back within 30 days, the wash-sale rule disallows your loss. However, with ETFs, you can sell one fund and replace it with a different fund tracking a similar but not identical index. That way you stay invested in the same broad market while still claiming the tax loss.
Examples investors often discuss as possible replacement ETF categories include:
- VTI → ITOT (total U.S. market; different indexes)
- VXUS → IXUS (total international; different issuers)
- VOO → IVV or SPLG (S&P 500; different issuers)
- BND → AGG (U.S. aggregate bond; different indexes)
These are educational examples, not tax recommendations. Whether two ETFs are “substantially identical” depends on the facts and circumstances. Investors should verify replacement choices with a qualified tax professional.
What Makes a Replacement ETF Reasonable?
The hardest part of ETF tax-loss harvesting is not selling the losing fund. It is choosing what to buy next.
A reasonable replacement ETF should generally do three things. First, it should keep your portfolio exposure broadly similar to what you had before. If you sell a total U.S. market ETF and replace it with a narrow sector fund, you have changed your asset allocation, not just your tax position.
Second, it should reduce the risk of triggering the wash-sale rule. Buying a fund from a different issuer that tracks a different index may help with this, but it does not create a guaranteed safe harbor. The IRS has not established a bright-line rule for ETFs, so the judgment involved means a tax professional’s input is valuable here.
Third, it should fit your original investment plan. Tax-loss harvesting should not turn a simple long-term portfolio into a collection of random replacement funds. The tax benefit is only useful if the portfolio still matches your intended asset allocation afterward.
The Wash-Sale Rule: The Most Important Rule to Know
The wash-sale rule is an IRS rule that disallows a capital loss if you buy a “substantially identical” security within 30 days before or after the sale that generated the loss. If you trigger the wash-sale rule, the disallowed loss is not permanently gone – instead, it is added to the cost basis of the replacement security. However, the timing of the deduction is delayed, which can reduce or eliminate its value in the current tax year.
The phrase “substantially identical” is the critical term. The IRS has not published a precise definition for ETFs, and its application in practice involves some judgment. Some investors reduce wash-sale risk by using replacement ETFs that track different indexes from different issuers. However, the IRS has not established a bright-line rule for ETFs, so this remains a judgment call rather than a guaranteed safe harbor.
Because the wash-sale rule involves tax law and individual circumstances, this is an area where a qualified tax professional can be especially helpful.
A Practical Example: VTI and VXUS
One of the most commonly discussed tax-loss harvesting setups for long-term investors involves holding VTI and VXUS separately in a taxable account.
Suppose international stocks have fallen, so VXUS is down significantly from your purchase price, while VTI has held up. In this scenario, you could sell VXUS to realize the loss, then immediately buy IXUS to maintain your international exposure. You have harvested a loss on your international allocation without reducing your market exposure.
This flexibility is one reason some investors compare a VTI + VXUS structure with a single-fund VT approach. Inside VT, you cannot harvest losses on just the international component – the U.S. and international portions move together as one fund. For the full comparison of VT versus VTI+VXUS, see VT ETF Explained.
Short-Term vs. Long-Term Losses
When you harvest a loss, it is classified as either short-term (held less than one year) or long-term (held more than one year). Short-term losses offset short-term gains, and long-term losses offset long-term gains. If losses exceed gains in one category, the excess can offset gains in the other category.
Short-term losses can be especially useful when they offset short-term gains, because short-term gains are taxed at ordinary income rates – potentially much higher than the long-term capital gains rate.
Loss Carryforward: When You Have More Losses Than Gains
If your harvested losses exceed your capital gains in a given year, you can use up to $3,000 of the remaining loss to offset ordinary income. Any loss beyond that limit carries forward to the next tax year – and the year after, indefinitely – until it is fully used. In severe market downturns, investors who harvest losses may accumulate meaningful carryforward balances that can offset future gains for years.
Does Tax-Loss Harvesting Change Your Long-Term Returns?
An important clarification: tax-loss harvesting does not eliminate your tax liability. It defers it.
When you sell an ETF at a loss and buy a replacement, your cost basis in the new fund is typically set at your purchase price. So when you eventually sell the replacement fund at a gain, you may owe more taxes at that point. The benefit of harvesting is that you receive the tax deduction now and defer the tax to the future.
Tax-loss harvesting can add value in certain situations – particularly when it converts short-term gains into long-term gains by changing the timing of recognition, or when harvested losses carry forward to offset gains in years when the investor is in a lower tax bracket. The benefit depends on your specific tax situation.
Who Can Benefit from Tax-Loss Harvesting?
Tax-loss harvesting generally does not apply inside tax-advantaged accounts because gains and losses are not taxed in the same year they occur – so there is nothing to harvest.
Within taxable accounts, the potential benefit is often larger for investors in higher tax brackets, because the tax savings from offsetting gains are greater. Investors in the 0% long-term capital gains bracket may have little or no benefit from harvesting long-term losses.
The practical checklist for tax-loss harvesting eligibility:
- You hold ETFs in a taxable brokerage account
- One or more of your positions is currently showing a loss from your purchase price
- You have capital gains elsewhere to offset, or you can use the loss against ordinary income
- A suitable replacement ETF exists that is not substantially identical to the one being sold
Beginner Decision: Should You Tax-Loss Harvest?
Tax-loss harvesting is not a strategy every investor needs to use. Here is how to think through whether it applies to your situation.
| Your situation | Tax-loss harvesting relevance |
|---|---|
| All accounts are Roth IRA or 401(k) | Not applicable – no taxable events to harvest |
| You have a taxable account but no current losses | Not applicable right now – monitor when markets decline |
| You have losses in a taxable account and gains to offset | Potentially valuable – review with a tax professional |
| You are in a high tax bracket with significant taxable investments | May be meaningfully valuable – consider actively |
| You hold VT instead of VTI + VXUS | Limited flexibility – compare with a two-fund structure before making future allocation decisions |
The strategy is not about chasing losses or market timing. Instead, it is about recognizing when the tax system gives you a way to convert a paper loss into a real tax benefit – without changing your long-term investment plan.
The Bottom Line
Tax-loss harvesting can improve after-tax results in some situations, but it is not risk-free or automatic. For ETF investors with taxable accounts, it is worth understanding, especially during market downturns when temporary losses may create harvesting opportunities.
The wash-sale rule is the main constraint to understand and navigate carefully. The ETF structure – with its many near-identical but technically distinct alternatives – makes this navigation more practical than it is with individual stocks.
For the complete picture of how ETFs are taxed across account types, see ETF Taxes Explained. For how account type affects when and whether tax-loss harvesting applies, see our guides on What Is a Roth IRA? and the taxable brokerage account section of How to Open a Brokerage Account. For a guide on which ETFs tend to benefit most from Roth IRA placement, see Best ETFs for Roth IRA. For which ETFs to prioritize inside a Roth IRA, see Best ETFs for Roth IRA.