Investment tax management
Tax-Loss Harvesting for High-Income Earners: Rules, Strategy, and Year-End Planning
By Matt Hightower · September 1, 2026
Fundamentals
What Is Tax-Loss Harvesting?
Tax-loss harvesting is the practice of selling a security that has lost value to realize a capital loss, then using that loss to offset capital gains recognized elsewhere in a portfolio. The offset works in tiers: short-term losses first offset short-term gains and long-term losses first offset long-term gains, and any loss left over after matching within its own category can then apply against gains of the other type.
Once gains for the year are fully offset, up to $3,000 of remaining loss per year, $1,500 if married filing separately, can be deducted against ordinary income such as salary or bonus. A loss larger than what gains and the $3,000 allowance can absorb in a single year is not lost. It carries forward indefinitely to future tax years, so a large loss harvested during a volatile year can continue to offset gains and income well after the year it was realized.
IRS rules
The Wash-Sale Rule Explained
The wash-sale rule, codified at IRC Section 1091, disallows a tax loss if you buy the same security or a "substantially identical" one within 30 days before or after the sale that generated the loss, a 61-day window in total counting the sale date itself. The rule applies across every account you or your spouse own, including retirement accounts, so repurchasing a sold position inside an IRA can disallow a loss claimed in a taxable brokerage account.
"Substantially identical" generally means the same company's stock or the same mutual fund share class. It generally does not mean the same market index tracked by a different provider's fund, for example one S&P 500 ETF swapped for another S&P 500 ETF from a different issuer, though the IRS has not published a bright-line list of which pairings qualify, so this is a facts-and-circumstances judgment worth confirming with a tax professional before assuming any two holdings are different enough.
A wash-sale violation does not erase the economic loss; it typically defers the tax benefit rather than eliminating it, by adding the disallowed loss to the cost basis of the repurchased security. But the loss cannot be claimed for the year in which the wash sale occurred, which is why timing and replacement security selection matter as much as the decision to sell.
High-income impact
Why Tax-Loss Harvesting Matters More for High-Income Earners
The value of a harvested loss scales with your marginal tax rate. At the 37% federal bracket, the $3,000 ordinary income deduction could reduce federal tax by roughly $1,110, compared with about $360 for a household in the 12% bracket claiming the same $3,000. The mechanics of the deduction are identical at every income level; what differs is how much each dollar of loss is worth against your own bracket.
High-income professionals are also more likely to generate short-term gains, taxed at the same rate as ordinary income, through RSU vesting events and concentrated stock positions that get trimmed or sold. Harvesting short-term losses to offset those short-term gains may be particularly valuable, since both sides of the offset sit at the higher ordinary-income rate rather than the lower long-term capital gains rate. Households working through a large RSU vest can use the RSU Tax Gap Calculator to see how a vest interacts with their overall bracket before deciding what, if anything, to harvest against it.
State income tax adds another layer for residents of high-tax states, where a harvested loss may also reduce state capital gains tax depending on that state's specific rules, though the treatment varies by jurisdiction and is worth confirming as part of a broader plan rather than assumed. For a fuller look at how harvesting fits alongside RSU withholding, deferred compensation, and charitable giving decisions, see our tax planning strategies for high-income earners.
Advanced strategy
Direct Indexing as an Advanced Approach
Direct indexing means owning the individual stocks that make up a market index directly in a separate account, rather than holding that same exposure through a single ETF or mutual fund. The portfolio is built to track the index's overall characteristics while each underlying stock remains its own position that can be bought or sold independently.
Because the positions are held individually, a stock that has declined can potentially be sold for a loss while the rest of the index exposure stays largely intact, and a similar replacement position can be purchased to maintain that exposure. This may generate more harvestable losses over time than fund-level harvesting, where a loss can only be realized once the fund as a whole trades below your cost basis.
Direct indexing also involves more moving parts than a single fund: more individual holdings to track, more trading activity, and typically a higher minimum account size and cost than buying an index ETF outright. Whether it makes sense depends on portfolio size and individual tax circumstances rather than being appropriate for every investor, and this discussion is educational rather than a recommendation of any specific product or provider. Our tax strategy services start by looking at whether an approach like this fits your portfolio before any implementation decision is made.
Timing
Year-End Planning and Seasonal Timing
The fourth quarter is typically when investors tally the gains and losses realized so far in the year and decide what, if anything, to harvest before December 31. Reviewing the full picture, equity compensation vests, any business sale proceeds, and gains or losses already taken in taxable accounts, before the final weeks of the year leaves more room to act deliberately rather than under time pressure.
Trades generally need to settle within the current tax year to count for that year, and settlement typically takes a business day or two after the trade date. Brokerages often publish an internal cutoff, usually a few trading days before December 31, by which a sell order needs to be placed to settle in time. Waiting until the last days of the year can leave too little time to also check for wash-sale exposure across every account a household holds.
Investors who wait until late December to start this review often miss part of the window entirely, since evaluating replacement securities and confirming that a purchase elsewhere in the household will not trigger a wash sale takes time that a last-minute review may not allow. Starting the review earlier in the fourth quarter, rather than treating harvesting as a single December task, may leave more options open.
Straight answers
Questions about tax-loss harvesting
The wash-sale rule, under IRC Section 1091, disallows a tax loss if you buy the same security or a substantially identical one within 30 days before or after the sale that generated the loss, a 61-day window in total. Substantially identical generally means the same company's stock or the same mutual fund share class, not necessarily a similar fund from a different provider that tracks the same index, though that line depends on the specific funds involved and is worth confirming with a tax professional before assuming two holdings are different enough.
Harvested losses first offset capital gains of the same type, short-term losses against short-term gains and long-term against long-term, with any leftover loss applied across categories. Once gains are fully offset, up to $3,000 of remaining loss per year ($1,500 if married filing separately) can offset ordinary income, and any loss beyond that carries forward indefinitely to future tax years.
It may be more valuable at higher marginal rates, since each dollar of loss that offsets ordinary income or a short-term gain saves more in tax the higher the bracket. At the 37% federal bracket, the $3,000 ordinary income deduction could reduce federal tax by roughly $1,110, compared with about $360 at the 12% bracket. Whether it is worth it for a given household depends on individual circumstances, including portfolio size, trading costs, and how gains and losses are already distributed across accounts.
No. Tax-loss harvesting applies only to taxable brokerage accounts, since gains and losses inside a traditional or Roth IRA or a 401(k) are not recognized for tax purposes until withdrawal, and in a Roth account may never be taxed at all. It is also worth knowing that buying a substantially identical security inside an IRA within the wash-sale window can still disallow a loss claimed in a taxable account, since the rule looks across an individual's and spouse's accounts as a whole.
Direct indexing means owning the individual stocks that make up an index directly in a separate account, rather than holding the index through a single ETF or mutual fund. Because each stock can be bought and sold independently, a position that has declined can potentially be harvested for a loss while the rest of the index exposure stays largely intact, which may generate more harvestable losses over time than waiting for the fund itself to show a loss. Suitability depends on portfolio size and individual tax circumstances, and the added complexity and cost are not appropriate for every investor.
Losses and gains occur throughout the year, so reviewing a portfolio periodically rather than only in December may catch opportunities an annual review would miss. That said, the fourth quarter is typically when investors tally full-year gains and losses and decide what to harvest before year-end, and trades placed too close to December 31 may not settle in time to count for that tax year, so starting the review earlier in the quarter can leave more time to act.
This material is for general educational purposes only and is not intended as tax, legal, or investment advice. Neither GGM Wealth Advisors nor Cambridge provides tax or legal advice. Please consult a qualified professional about your specific situation.
See how tax-loss harvesting fits your own portfolio
Whether harvesting makes sense, and how much it may be worth, depends on your gains, your bracket, and what is already happening across your accounts. A conversation is the fastest way to find out.