Tax-Gain Harvesting

Long-term capital gains and qualified dividends are taxed on a separate 0%, 15% and 20% schedule, but they share one income stack with everything else. Ordinary income such as wages, pensions and IRA withdrawals fills the stack first, after deductions, and gains sit on top. Gains that land below the 0% ceiling are taxed at 0%; only the part above it moves up to 15%.

Gain harvesting uses that empty room on purpose. You sell shares held more than a year, which makes the gain long-term, and usually buy the same shares back right away, which the wash sale rule allows because it blocks only losses. The portfolio looks the same afterward, but the new shares carry a cost basis equal to what you just paid, so a later sale has less gain left to tax. They also start a fresh holding period. If you own several lots, identifying the specific ones you sell, as IRS Publication 550 allows, controls exactly how much gain each sale realizes.

For 2026 the 0% rate applies to long-term gains while taxable income is at or below $49,450 for single filers and married people filing separately, $66,200 for heads of household, and $98,900 for married couples filing jointly. Because the ceilings are measured after deductions, the income you can have is higher. The table below adds the 2026 deductions to each ceiling: a married couple under 65 living only on long-term gains and qualified dividends could realize $131,100 with no federal income tax. At 65 or older, the extra standard deduction and the 2025–2028 senior deduction add room, though the senior deduction shrinks by 6% of MAGI above $75,000, or $150,000 for joint filers.

Above the 0% ceiling the rate is 15% up to $545,500 of taxable income for single filers or $613,700 for joint filers, then 20%. The 3.8% net investment income tax starts once MAGI passes $200,000 single or $250,000 joint, thresholds not indexed for inflation. That gap is why some investors harvest inside the 15% band when they expect to face 20% plus 3.8% later.

A 0% federal rate does not make a harvest free. Realized gains raise adjusted gross income and MAGI, and several other rules read those figures. The extra income can also feed on itself: if it makes more of your Social Security taxable, that added ordinary income pushes some gains out of the 0% band and into 15%. Run the whole return, not just the capital gains line, before deciding how much to realize, and check each of these for the year.

Gain harvesting competes with a Roth conversion for the same low-income years. Converted dollars are ordinary income, and ordinary income sits beneath capital gains in the stack, so every dollar converted removes a dollar of 0% gains room. In the example below, a $30,000 conversion would cut the couple’s 0% harvest from $61,100 to $31,100. Which to favor depends on the rates involved: a conversion avoids tax on decades of future growth and shrinks later required distributions, while a harvest saves only the capital gains tax a later sale would have owed.

Tax-loss harvesting is the mirror image for high-income years. Doing both in the same year rarely makes sense, because a harvested loss would cancel the harvested gain. The same goes for a capital loss carryover from earlier years: it must be used against this year’s gains, so a household with a large carryover gets little from harvesting at 0% until the carryover is gone.

Gain harvesting fits people who hold appreciated investments in a taxable account and face a stretch of low taxable income: early retirees living on savings before Social Security and required distributions begin, people between jobs or on a career break, and retirees whose income stays modest. It is also a clean way to rebalance, or to diversify out of one large holding, without a federal tax bill.

It adds little in three cases. If you expect to hold the shares until death, a step-up in basis erases the gain for your heirs anyway. If you plan to give the shares to charity, donating them directly avoids the gain. And if you will stay in the 0% band for life, later sales would be tax-free too, so harvesting saves nothing federally and may only pay state tax sooner.