Federal tax on a long-term gain, your tax-free harvesting room, and the NIIT cliff.
2026 long-term gains brackets (0% / 15% / 20%), stacked on top of ordinary taxable income after the standard deduction; 3.8% NIIT thresholds ($200K single / $250K MFJ). Short-term gains are taxed as ordinary income. State tax not included. Estimates only — not tax advice.