LTCG Bracket Stacking

Long-term capital gains (LTCG) and qualified dividends are taxed at preferential rates: 0%, 15%, or 20% depending on taxable income — not MAGI. In 2026, the 0% LTCG rate applies up to $49,450 taxable income (single) or $98,900 (MFJ).

The stacking problem: ordinary income (wages, IRA withdrawals, Roth conversions, Social Security) is taxed first. It occupies the bottom of the taxable income stack. LTCG and qualified dividends sit on top of it. When ordinary income rises, it pushes LTCG into the 15% bracket even though the gains themselves haven't changed.

When taxable income (ordinary income + LTCG) exceeds $49,450 (single) or $98,900 (MFJ), the portion of LTCG above the threshold is taxed at 15% instead of 0%. That threshold sits inside the 12% ordinary tax bracket, so this creates an effective marginal rate of roughly 27% on the stacked gains (12% ordinary rate + 15% LTCG stacking).

• 0% LTCG ceiling: $49,450 (single), $98,900 (MFJ) in taxable income
• 15% rate applies from the ceiling up to $545,500 (single)
• 20% rate applies above the 15% ceiling
• Ordinary income stacks below LTCG — a Roth conversion raises the floor under your gains
• The 0% → 15% jump is a cliff: there is no phase-in within a single dollar
• Qualified dividends follow the same rate schedule as LTCG

If you have $20,000 of qualified dividends sitting at the 0% rate and a Roth conversion pushes $20,000 of those dividends into the 15% bracket, the cost is $3,000 in additional tax from the stacking effect alone — independent of the ordinary income tax on the conversion itself.

Retirees with substantial brokerage accounts generating dividends or capital gains face this cliff even without deliberate action — annual portfolio distributions can incrementally push taxable income over the 0% ceiling without any Roth conversion.