Capital Gains Harvesting: Use the 0% Bracket Before It Disappears

Most investors pay tax when they sell winners. Capital gains harvesting flips that: sell winners on purpose, in a year when your income is low, and pay 0% on the gains — then rebuy (or hold) with a higher cost basis. It is one of the most underused moves in the tax code, and it pairs perfectly with a low-income year.

How the 0% bracket works

Long-term capital gains (held more than a year) are taxed at 0%, 15%, or 20%. For 2026 the 0% bracket covers gains up to $49,450 of taxable income (single) or $98,900 (joint). Gains stack on top of your ordinary income, so the calculation is: how much room is left between your income and the threshold?

Who it is for

• Early retirees before Social Security and RMDs — the classic 0%-bracket years.
• Anyone in a gap year: between jobs, on sabbatical, or studying.
• Families with big deductions that push taxable income near zero.

A married couple with $50,000 of taxable income has $48,900 of 0%-bracket room — they can realize nearly $49,000 of gains tax-free and reset that much cost basis.

The wash-sale trap

Harvesting gains has a mirror-image rule: the wash-sale rule (meant for losses) also blocks gains if you buy the same security within 30 days. Selling and immediately buying an identical fund disallows the reset; selling and buying a similar-but-different fund (a different S&P 500 ETF, for example) works.

Why harvest instead of just holding?

Holding deferstax but keeps your basis low. Harvesting in a 0% year raises the basis, so the next sale — at 15% or 20% — taxes less appreciation. Over a lifetime the compounding of repeated basis resets is worth tens of thousands of dollars on a large portfolio.

Pair it with the other year-end moves

Harvest losses to offset gains (and $3,000 of ordinary income), harvest gains to fill the 0% bracket, and consider a Roth conversion in the same low-income year — the conversion uses ordinary-income room, the gains use the gains room, and both reset your tax posture for the better.

Run the numbers

Find your room with the capital gains harvesting calculator, offset the losers with the tax loss harvesting calculator, and see the full gain math with the capital gains tax calculator. Bracket context: 2026 tax brackets guide and the year-end checklist.