Key facts
- Married couples filing jointly can realize up to $98,900 in long-term capital gains tax-free in 2026.
- The 0% federal long-term capital gains rate applies when taxable income is below $98,900 for joint filers in 2026.
- The standard deduction for married couples filing jointly in 2026 is $32,200.
- Ordinary income, such as pension or taxable Social Security, fills the lower income tax brackets before long-term capital gains.
- Selling assets held for over a year is required for long-term capital gains treatment.
- Harvesting gains can reset an asset's cost basis, potentially lowering future tax liabilities.
For married couples filing jointly in 2026, a significant federal tax opportunity exists to realize up to $98,900 in long-term capital gains without owing any federal tax. This 0% tax bracket is available when a household's total taxable income, after accounting for deductions and ordinary income, remains below a specific threshold. The 2026 threshold for this 0% rate is $98,900 for joint filers. This strategy allows retirees to strategically sell appreciated assets, reset their cost basis, and potentially reduce future tax burdens.
However, this tax break is often underutilized. Factors such as taxable Social Security benefits, which can consume a portion of the available income space, and a common retiree habit of selling assets only when needed rather than for tax planning purposes, contribute to this underuse. The mechanism involves ordinary income filling the lower tax brackets first, with long-term capital gains sitting on top. Only gains that push taxable income above the $98,900 threshold are subject to the 15% capital gains rate. A couple with $40,000 in taxable Social Security benefits and the $32,200 standard deduction still has substantial room within the 0% bracket for tax-free gain harvesting.
The scale of unrealized gains among retirees is considerable, with average 401(k) balances reaching record highs. While retirement account gains are tax-deferred, many retirees also hold taxable brokerage accounts with embedded gains from long-term investments. Strategic sales within the 0% bracket can reset the cost basis of these assets, which can be beneficial for future tax calculations. However, increasing adjusted gross income through gain harvesting can affect other tax-related rules, such as the taxation of Social Security benefits or IRMAA (Income-Related Monthly Adjustment Amount) assessments two years later. Therefore, selective harvesting alongside available capital losses is advised.