Data Notice: Capital gains rates and thresholds in “Capital Gains Tax in Massachusetts: Complete Guide 2026” are projected 2026 figures based on IRS inflation adjustments. Investment tax treatment depends on holding period, account type, and total income. Consult IRS Publication 550 and a tax professional for your situation. [capital-gains-tax-massachusetts-2026]

Capital Gains Tax in Massachusetts: Complete Guide 2026

This article about capital gains tax in massachusetts: complete guide 2026 provides general tax education and is not a substitute for professional tax advice. Laws and regulations discussed here may have changed since publication. Work with a licensed tax advisor for decisions affecting your specific tax situation.

Massachusetts taxes capital gains at its flat 5.00% income tax rate for long-term gains and 12.00% for short-term gains. Additionally, the state’s “millionaire’s tax” (Fair Share Amendment, approved in 2022) imposes a 4% surtax on all income — including capital gains — exceeding $1 million. This means Massachusetts taxpayers with large gains face a combined state rate of 9.00% on the portion above $1 million, making the effective rate among the highest in the country for one-time large transactions.

Massachusetts Capital Gains Tax Rates (2026)

Gain Type	Rate	Surtax (over $1M)	Effective Top Rate
Short-term (held 1 year or less)	12.00%	+4.00%	16.00%
Long-term (held more than 1 year)	5.00%	+4.00%	9.00%

The 4% surtax applies to total taxable income (all sources combined) exceeding $1 million, not just capital gains. The $1 million threshold is adjusted annually for inflation.

Combined Federal + Massachusetts Rate on Long-Term Gains

Income Level	Federal Rate	MA Rate	NIIT	Combined
Below ~$48,350	0%	5.00%	—	5.00%
~$200K — ~$533K	15%	5.00%	3.8%	23.8%
Over ~$1M (total income)	20%	9.00%	3.8%	32.8%

How It Works

Short-Term vs. Long-Term Distinction

Unlike many states that tax all capital gains at the same rate, Massachusetts distinguishes between short-term and long-term gains:

Short-term gains (assets held one year or less) are taxed at 12.00% — one of the highest short-term rates in the country
Long-term gains (assets held more than one year) are taxed at the standard 5.00% flat income tax rate

This creates a strong incentive to hold assets for more than one year before selling. The difference between 12.00% and 5.00% is enormous — on a $100,000 gain, holding one extra month saves $7,000 in Massachusetts tax alone.

Approved by voters in November 2022, the surtax adds 4% on all taxable income above ~$1 million (threshold adjusted for inflation). This applies to:

All income types combined (salary, capital gains, business income, etc.)
The aggregate amount over the threshold, not just capital gains

Example: A taxpayer with $200,000 in salary and $1,200,000 in long-term capital gains has $1,400,000 in total income. The surtax applies to $400,000 (the amount over $1 million). On that $400,000, the additional 4% surtax equals $16,000.

Capital Loss Rules

Massachusetts allows capital losses to offset capital gains. Short-term losses first offset short-term gains; long-term losses first offset long-term gains. Excess losses can then offset the other category. Up to $2,000 in net capital losses can be deducted against ordinary income (lower than the federal $3,000 limit). Unused losses can be carried forward.

Comparison to National Average

Metric	Massachusetts	Typical State
Long-term capital gains rate	5.00% (9.00% with surtax)	~0%—5%
Short-term capital gains rate	12.00% (16.00% with surtax)	Same as ordinary income
Surtax on high earners	4% over $1M	Rare
Capital loss deduction	$2,000 vs ordinary income	$3,000 (federal)

Massachusetts’ 12.00% short-term rate is the highest in the nation. The 5.00% long-term rate is moderate, but the 4% surtax pushes the effective rate to 9.00% for millionaire-threshold taxpayers.

Tips for Minimizing Massachusetts Capital Gains Tax

Hold assets for more than one year. The 7-percentage-point difference between the short-term (12%) and long-term (5%) rate makes this the single most impactful strategy for Massachusetts investors.
Spread large gains across tax years. If possible, stagger asset sales to stay below the $1 million surtax threshold in each year. Selling $800,000 in each of two years avoids the surtax entirely, while selling $1.6 million in one year triggers $24,000 in additional tax.
Harvest losses in the same year. Offset gains with losses to reduce the taxable amount. Remember that Massachusetts limits the deduction of net capital losses against ordinary income to $2,000 (not the federal $3,000).
Consider installment sales. For large asset or business sales, structuring the deal as an installment sale spreads income over multiple years and can keep you below the surtax threshold.
Donate appreciated assets. Donating stock held more than one year avoids both the federal and Massachusetts capital gains tax and provides a fair market value deduction.
Maximize retirement contributions. Gains within 401(k)s, IRAs, and Roth accounts are not subject to Massachusetts capital gains tax. Contributing the maximum shelters more of your investment returns.
Factor in the surtax for business sales. Founders selling a business for a multi-million-dollar gain should plan for the 4% surtax and consider strategies like installment sales, charitable remainder trusts, or qualified opportunity zone investments.

Key Takeaways

Massachusetts taxes short-term capital gains at 12.00% — the highest such rate in the nation
Long-term gains are taxed at the flat 5.00% rate, but the 4% surtax on income over $1 million pushes the effective rate to 9.00%
The combined federal-plus-state rate can reach 32.8% for high earners with gains above $1 million
The distinction between short-term and long-term rates is more consequential in Massachusetts than in most states
Capital losses can offset gains but are limited to $2,000 against ordinary income (not $3,000 as at the federal level)
Spreading gains across tax years to avoid the surtax threshold is a key planning strategy

Next Steps

See the full Massachusetts tax picture at Taxes in Massachusetts: State Tax Guide 2026
Compare all states at State Income Tax Rates Comparison 2026
Calculate your liability with the Capital Gains Tax Calculator
Review strategies in the Capital Gains Tax Guide
Get professional guidance: Find a CPA Near You