The S&P 500 closed above 7,800 for the first time on October 6, and The Motley Fool’s tally the next day had the index on pace for roughly a 14% gain this year. That makes this an awkward December for tax-loss harvesting, the year-end move every brokerage newsletter is about to email you about. Most of us don’t have many losers to sell. What a lot of us do have is a quieter, better opportunity that the standard advice barely mentions: the 0% capital gains bracket. For a single filer in 2026, it covers taxable income up to $49,450. If you’re anywhere near that number, the smart move this year might be to sell your winners, not your losers.
I know that sounds backwards. Selling winners on purpose feels like inviting a tax bill. Under the right income, though, the bill is zero, and the numbers below show why it beats the loss harvest for a lot of moderate earners.
Tax-loss harvesting is a deferral, and the top guides skip that part
The basic pitch is fine as far as it goes. You sell an investment that’s down, the loss offsets capital gains you realized elsewhere, and if you have more losses than gains, up to $3,000 a year comes off your ordinary income, per the IRS’s own Topic 409. Anything beyond that carries forward. (That $3,000 cap, by the way, has been frozen since tax years starting after 1977, according to a Congressional Research Service analysis of the Tax Reform Act of 1976. Inflation has eaten most of it.)
What NerdWallet, The Motley Fool, and most of the other top-ranking explainers skip is the second half of the trade. When you sell at a loss and buy something similar to stay invested, your new shares carry a lower cost basis. The loss you claimed today becomes extra gain you’ll report later. So you haven’t erased the tax. You’ve moved it to a future year.
Sometimes that move is worth a lot, mainly if you’re in a high bracket now and expect a lower one later. But for someone in the 12% bracket, the trade can run backwards. Claim a $3,000 loss against ordinary income and you save $360 this April. If you sell those replacement shares years from now as a 15% capital gains taxpayer, that same $3,000 comes back as gain and costs you $450. You’ve paid $90 for a $360 loan.
The 0% capital gains bracket is where moderate earners come out ahead
Long-term capital gains (from assets held more than a year) get their own rate schedule. Under IRS Revenue Procedure 2025-32, the official 2026 inflation adjustments, a single filer pays 0% on long-term gains as long as her total taxable income stays at or under $49,450. For married couples filing jointly the line is $98,900. Above those amounts the rate is 15% until $545,500 single or $613,700 joint, and 20% after that.
The detail people miss: gains stack on top of your ordinary income. Your salary fills the bucket first, and whatever room is left under $49,450 is room you can fill with long-term gains at a federal rate of zero.
Tax-gain harvesting uses that room on purpose. You sell appreciated shares, realize the gain at 0%, and buy them right back. You can rebuy the same day, too. The wash sale rule only disallows losses, so it doesn’t touch a sale at a gain. Your position looks identical afterward, except your cost basis is now higher. That higher basis is a permanent reduction in the tax you’ll owe whenever you eventually sell for real.
A $62,000 salary leaves more room than you’d guess
Say you’re single, earning $62,000, and you put $8,000 into your 401(k) this year. Your income for tax purposes drops to $54,000. Subtract the 2026 standard deduction of $16,100 and your taxable ordinary income is $37,900.
Now the gap: $49,450 minus $37,900 is $11,550. That’s how much long-term gain you could realize this December and owe nothing on federally.
So suppose you have an S&P 500 index fund in a regular brokerage account that you bought in 2023, and it’s up well past $11,550. You sell enough shares to realize exactly $11,550 of gain, then buy the same fund back that afternoon. Federal tax owed on that gain: $0. If you’d waited and sold those shares later as a 15% taxpayer, the same $11,550 of gain would have cost $1,732.50. Compare that to the $360 a full $3,000 loss harvest saves the same person, and it’s not close.
Two practical notes on the math. First, the 0% line isn’t a cliff. If you overshoot by $500, only that $500 is taxed at 15% ($75), so you don’t need to be precise to the dollar. Use your last pay stub and a rough year-end estimate and leave yourself a small cushion. Second, the 12% ordinary bracket for single filers in 2026 runs to $50,400, slightly higher than the $49,450 gains threshold. Someone can be solidly “in the 12% bracket” and still have a few hundred dollars of gains spill into 15%. Annoying, and not a reason to skip it.
Your Roth IRA can quietly cancel a harvested loss
If you do have real losses this year (a single stock that cratered, say, or a sector fund), loss harvesting still makes sense. Just watch the trap almost nobody warns about.
The wash sale rule disallows your loss if you buy a “substantially identical” security within 30 days before or after the sale. Most people know that part. What they don’t know is that in Revenue Ruling 2008-5, the IRS held that a purchase made inside your own IRA or Roth IRA counts. The ruling’s language is blunt: the loss “is disallowed,” and your basis in the IRA “is not increased.”
That second half is the painful part. In a normal wash sale inside a taxable account, the disallowed loss gets added to the basis of the new shares, so you recover it eventually. When the repurchase happens in an IRA, it’s simply gone. Financial planner Michael Kitces flagged it the year the ruling came out. It bites harder now that so many of us have automatic monthly Roth contributions set to buy the same total market fund we hold in our brokerage account. Sell that fund at a loss on December 10, let your Roth auto-invest in it on December 15, and the loss is gone for good.
Before you harvest, look at every automatic purchase you have scheduled for the next 30 days, including Roth and IRA contributions, dividend reinvestment in the fund you’re selling, and your spouse’s accounts (the wash sale rule covers purchases by your spouse, too). Turning off dividend reinvestment on that one fund for a month is an easy fix. If your 401(k) holds the identical fund, ask a tax pro, because the 2008 ruling speaks to IRAs specifically and the 401(k) question is murkier.
Most women’s invested money sits where harvesting can’t help
None of this touches money inside a 401(k) or IRA, where gains aren’t taxed year to year anyway. If you’re not sure which account does what, our Roth IRA vs. 401(k) explainer sorts it out. Harvesting of either kind only matters in a regular taxable brokerage account, and that’s a smaller club than the year-end marketing implies. The Federal Reserve’s 2022 Survey of Consumer Finances found 58% of families held stock in some form but only 21% held it directly. Fidelity’s 2024 Women and Money study found 71% of women now own stock market investments, but only 28% invest outside of retirement accounts.
If you’re in that 28%, especially if you started with a simple index fund a few years ago and it has run up, December is a good time to check how much 0% room you have.
There are real costs to watch. Realized gains raise your adjusted gross income even when the federal rate is zero, and that can shrink ACA marketplace premium credits or raise an income-driven student loan payment. Most states tax capital gains as regular income, so “0%” is a federal number. And if you’re in a higher bracket, with real losses and real gains to offset, classic tax-loss harvesting is still a strong tool.
But for a moderate earner in a record-high year, tax-loss harvesting is the second-best move on the table. Before you sell anything this December, pull up your latest pay stub, estimate your taxable income, and subtract it from $49,450 (or $98,900 if you file jointly). If the result is positive, that’s your 0% room. If the account is large or your income is lumpy this year, an hour with a CPA costs a lot less than getting it wrong.