Tools · Capital Gains Tax
Massachusetts Capital Gains Tax Calculator (2026)
Estimate the tax on your capital gains in Massachusetts for 2026. Enter your gain, holding period, and other income to see federal long- or short-term tax, the 3.8% Net Investment Income Tax, and Massachusetts’s share, broken out line by line.
Massachusetts capital gains tax calculator
- Gain taxed at 0% (long-term)
- $15,550 → $0
- Gain taxed at 15% (long-term)
- $4,450 → −$668
- Federal long-term capital gains tax
- −$668
- Net Investment Income Tax (3.8%)
- $0
- Massachusetts income tax on gain
- −$1,000
- Total capital gains tax
- $1,668
Massachusetts taxes capital gains as ordinary income. Massachusetts taxes most income at a flat 5%, plus a 4% surtax on the portion of taxable income above $1,107,750 (2026) — a combined 9% at the top.
Federal: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration. State: Massachusetts Department of Revenue.
Estimate for 2026. Long-term gains are stacked on top of your other taxable income across the 0/15/20% federal breakpoints; short-term gains are taxed as ordinary income. The 3.8% Net Investment Income Tax applies once your income clears the threshold. Excludes state credits, the alternative minimum tax, and loss carryovers. This is general information, not tax advice.
How capital gains tax works in Massachusetts
Long-term gains (assets held more than a year) get the federal 0/15/20% rates — but the rate depends on where the gain lands once it is stacked on top of your other taxable income, so part of a gain can be taxed at 0% and the rest at 15%. Short-term gains are taxed as ordinary income. On top of that, the 3.8% Net Investment Income Tax applies once your income clears $200,000 (single) or $250,000 (married-jointly).
Massachusetts taxes capital gains as ordinary income, at the same rate as your wages. Massachusetts taxes most income at a flat 5%, plus a 4% surtax on the portion of taxable income above $1,107,750 (2026) — a combined 9% at the top.
This is an annual-bracket estimate, not your final return. It excludes the alternative minimum tax, loss carryovers, and state credits. It is general information, not tax advice. Federal figures: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration.
Capital gains calculators for other states
Same 2026 engine, each with its own state rules.