What is Tax-Loss Harvesting?

Tax loss harvesting is the process of selling securities that have declined in value, realizing a loss, and using that loss to offset gains from other investments. By doing so, you can reduce the amount of taxes you owe on your investment gains. This strategy is particularly useful during times of market volatility or when you need to rebalance your portfolio.

The $3,000 rule and the carryforward

The example below shows losses offsetting gains, but the rules go further. Capital losses first cancel out capital gains, dollar for dollar. If your losses exceed your gains, you can use up to $3,000 of the leftover loss each year to offset ordinary income like wages. Anything beyond that does not disappear. It carries forward to future tax years indefinitely, waiting to offset gains or income down the road.

That carryforward is the quiet superpower of the strategy. A big harvested loss in a bad year becomes a tax asset you can use for years, shaving the bill on future gains. Track it on your tax return each year so it does not get lost, and remember the $3,000 cap applies to ordinary income only. There is no cap on how much loss can offset capital gains in a single year.

How Does it Work?

Here’s a simple example:

Let’s say you invested $10,000 in Stock A, which has since declined to $8,000. You also invested $10,000 in Stock B, which has increased in value to $12,000. If you sell Stock A, you’ll realize a loss of $2,000. If you also sell Stock B, your gain is $2,000 ($12,000 minus $10,000 cost basis), and the harvested loss wipes it out entirely, leaving $0 in taxable gains.

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Benefits of Tax Loss Harvesting

Reduces Tax Liability: By offsetting gains with losses, you can reduce the amount of taxes you owe on your investment gains.
Helps Rebalance Your Portfolio: Tax loss harvesting can help you rebalance your portfolio by selling securities that no longer align with your investment goals or risk tolerance.
Improves After-Tax Returns: By minimizing taxes, you can keep more of your investment returns, which can lead to improved after-tax returns over the long term.

The two mistakes that undo the benefit

The first mistake is the wash sale. Sell a fund at a loss and buy the same fund back three weeks later, and the IRS disallows the loss. The rule covers 30 days before and after the sale, a 61-day window, and it applies across all your accounts, including your IRA. The standard workaround is to buy a similar but not “substantially identical” fund, like swapping one S&P 500 index fund for a total-market fund, and holding it for the 31 days.

The second mistake is harvesting in the wrong account. Losses in an IRA or 401(k) cannot be harvested at all, since those accounts are already tax sheltered. And a loss is only worth harvesting if you actually have gains or income to offset. Selling at a loss in December just to feel productive, with no gains to absorb it and no plan for the $3,000 income offset, is tax theater. Harvest with a destination for the loss already in mind.

Important Considerations

Before implementing a tax loss harvesting strategy, keep the following in mind:

Wash Sale Rule: If you sell a security at a loss and buy a “substantially identical” security within 30 days, the loss will be disallowed for tax purposes.
Tax Implications: Tax loss harvesting should be done in conjunction with your overall tax strategy and investment goals. Consult with a tax professional or financial advisor to ensure you’re making the most of this strategy.

Tax loss harvesting is a valuable strategy for investors looking to minimize taxes and maximize after-tax returns. By understanding how to harness the power of tax losses, you can take a more proactive approach to managing your investments and achieving your long-term financial goals. Consult with a financial advisor or tax professional to determine if tax loss harvesting is right for you.