Massachusetts Tax on Capital Gains

Massachusetts imposes capital gains taxes that vary based on how long an asset is held and the type of asset sold.

In addition, higher-income taxpayers may be subject to an extra 4% surtax, often referred to as the “Millionaire’s Tax.”

Unlike the federal tax system, Massachusetts does not offer deeply discounted long-term capital gains rates such as 0% or 15%.

However, long-term gains are still taxed at a lower rate than short-term gains, creating an incentive for longer holding periods.

Base Capital Gains Tax Rates

• Long-term capital gains (assets held more than one year): 5%
• Short-term capital gains (assets held one year or less): 8.5%

These rates apply to most common investments, including stocks, bonds, mutual funds, and business interests.

Detailed Breakdown by Asset Type

Additional 4% Surtax (Millionaire’s Tax)

For tax years beginning January 1, 2023 and later, Massachusetts imposes an additional 4% surtax on all taxable income, including capital gains, that exceeds an inflation-adjusted threshold.

Income Thresholds

• 2024: $1,053,750
• 2025: $1,083,150

Only the portion of income above these thresholds is subject to the surtax.

Impact on Effective Capital Gains Rates

For high-income taxpayers, the surtax significantly increases overall tax liability:

• Top effective long-term capital gains rate: 9% (5% + 4%)
• Top effective short-term capital gains rate: 12.5% (8.5% + 4%)

This places Massachusetts among the higher-tax states for investment income, particularly for high earners.

Key Exclusions and Tax-Saving Provisions

Primary Residence Exclusion

Massachusetts conforms to the federal home sale exclusion under IRC §121:

• Up to $250,000 of gain excluded for single filers
• Up to $500,000 excluded for married couples filing jointly

As long as federal ownership and residency requirements are met, excluded gains are not taxable for Massachusetts purposes.

Capital Loss Offsets

• Capital losses may be used to offset capital gains
• Unused losses can generally be carried forward to future tax years
• Massachusetts largely follows federal capital loss rules

Inherited Property (Step-Up in Basis)

Inherited assets receive a step-up in basis to their fair market value as of the previous owner’s date of death. This often:

• Greatly reduces taxable capital gains
• Eliminates Massachusetts capital gains tax if the asset is sold soon after inheritance

Example

A Massachusetts resident sells stock held for five years and realizes a $200,000 gain:

• Long-term capital gains tax at 5% = $10,000
• If total taxable income exceeds $1,083,150, the portion above that threshold is also taxed at 4%
• Federal capital gains taxes may apply separately

Filing and Payment Recommendation: File Electronically

Massachusetts encourages electronic filing through MassTaxConnect or approved tax software.

Benefits of Electronic Filing

• Faster processing and refunds
• Automatic calculations that reduce errors
• Immediate confirmation of receipt
• Easier reporting of capital gains schedules and surtax calculations
• Secure online payments and payment plan options

Taxpayers with capital gains—especially those subject to the 4% surtax—benefit significantly from e-filing due to the complexity of income thresholds and reporting requirements.

Bottom Line

Massachusetts capital gains taxation is layered and income-sensitive, with different rates based on holding period, asset type, and total income.

While long-term gains receive favorable treatment compared to short-term gains, high earners face substantially higher effective rates due to the Millionaire’s Tax.

Strategic planning and electronic filing can help ensure accuracy, maximize exclusions, and reduce overall tax liability.