How to use the 0% long-term capital gains bracket

If your taxable income — including the long-term gain — stays below the IRS 0% long-term capital gains threshold for your filing status, federal tax on that qualified long-term gain can be $0. State tax may still apply, and NIIT is usually not an issue at those income levels.

The 0% window is measured with gain stacking: ordinary taxable income fills the brackets first, then long-term gains stack on top. A retiree with modest ordinary income may realise a surprising amount of long-term gain at 0%, while a high-W2 earner may push the same gain straight into 15% or 20%.

Households sometimes time realisations across tax years, pair gains with deductible contributions or charitable giving, or realise gains in lower-income years (for example early retirement or sabbatical years). None of these are universal advice — they depend on your full return, IRMAA, state tax, and cash needs.

Always model the gain inside taxable income for your filing status. Use our single and married filing jointly landers for bracket context, and the main calculator for a combined federal-plus-state estimate.