Massachusetts Millionaire Surtax Calculator 2026 โ 4% on Income Over $1M
Calculate Massachusetts income tax with the 4% millionaire surtax on income above $1M. Total MA rate = 9% above threshold. Model year-of-sale events, installment sale strategies, and income smoothing.
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MA itemized deductions are limited; most taxpayers use standard exemptions Massachusetts Tax Breakdown
Massachusetts Tax Rate Structure (2026)
Massachusetts has a flat income tax of 5% on all taxable income. The millionaire surtax (Question 1) adds a 4% surcharge on MA taxable income above $1,000,000, bringing the combined rate to 9% on income over $1M โ one of the highest state income tax rates in the US.
MA Taxable Income = Total Income โ MA Deductions
Regular MA Tax = MA Taxable Income ร 5%
Surtax Base = max(0, MA Taxable Income โ $1,000,000)
Surtax = Surtax Base ร 4%
Total MA Tax = Regular MA Tax + Surtax
Effective MA Rate = Total MA Tax / MA Taxable Income
Note: MFJ threshold = $1M (same as single โ no marriage bonus)
Regular MA Tax = MA Taxable Income ร 5%
Surtax Base = max(0, MA Taxable Income โ $1,000,000)
Surtax = Surtax Base ร 4%
Total MA Tax = Regular MA Tax + Surtax
Effective MA Rate = Total MA Tax / MA Taxable Income
Note: MFJ threshold = $1M (same as single โ no marriage bonus)
Example โ MFJ, $500K wages + $800K capital gain ($1.3M total):
MA Taxable Income: $1,300,000
Regular MA tax (5%): $65,000
Surtax base: $1,300,000 โ $1,000,000 = $300,000
Surtax (4%): $12,000
Total MA tax: $77,000 โ effective rate 5.92%
MA Taxable Income: $1,300,000
Regular MA tax (5%): $65,000
Surtax base: $1,300,000 โ $1,000,000 = $300,000
Surtax (4%): $12,000
Total MA tax: $77,000 โ effective rate 5.92%
Sources & References (click to expand)
- MA DOR TIR 23-1 โ Implementation of the 4% Surtax (Question 1 guidance)
- Massachusetts Constitution Article 44 โ Amendment adding the 4% surtax
- MGL Chapter 62 ยง4(d) โ Massachusetts Millionaire Surtax statute
- MA DOR โ Massachusetts Personal Income Tax Overview (Form 1 instructions and rates)
- IRS Form 1040 โ Federal return reference for MA-conforming income definitions
Extended
Year-of-Sale Income Smoothing Strategy Calculator
Model installment sales, Roth conversion timing, and multi-year income smoothing to minimize Massachusetts surtax with SVG tax-by-strategy chart
Model installment sales and multi-year income smoothing to minimize Massachusetts surtax. See how spreading a large gain over multiple years changes your tax.
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Recurring income each year, separate from the event %
Total MA Tax by Scenario
Lump Sum (Year 1) Installment Sale (N years)
Year-by-Year Tax with Installment Sale
| Year | Base Income | Installment | Total MA Income | MA Regular Tax (5%) | Surtax (4%) | Total MA Tax |
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Frequently Asked Questions
What is the Massachusetts Millionaire Surtax and who does it apply to?
Massachusetts Question 1 (passed November 2022, effective January 2023) amended the Massachusetts Constitution (Article 44) to add a 4% surtax on all Massachusetts taxable income above $1,000,000 per year. When combined with the existing 5% flat state income tax, income above $1M is taxed at 9% in Massachusetts. The surtax applies to all types of income โ wages, business income, capital gains, interest, dividends, IRA distributions, lottery winnings, and any other Massachusetts taxable income.
Does the $1M threshold apply per person or per household?
The $1M threshold applies per return, not per taxpayer. For married couples filing jointly (MFJ), the threshold is $1M total โ NOT $1M per spouse. So a MFJ couple with combined MA income of $1.1M pays the 4% surtax on $100,000, even though neither individual earned $1M alone. This is the same threshold as a single filer. Notably, it is NOT possible to reduce surtax by filing separately โ Massachusetts requires married couples to use the same filing status as their federal return.
What strategies can reduce the Massachusetts Millionaire Surtax in a high-income year?
The most effective strategies involve spreading income across multiple years to stay under $1M: (1) Installment sales โ instead of selling a business for $5M in one year, spread payments over 5+ years so each year's income is under $1M; (2) Defer compensation โ defer bonuses to the following year if you're near the $1M threshold; (3) Roth conversion timing โ avoid large Roth conversions in years with other income near $1M; (4) Charitable bunching in the highest-income year; (5) For RSU vests โ negotiate staggered vesting to avoid multiple tranches vesting in the same tax year.
Does the surtax apply to capital gains in Massachusetts?
Yes. Massachusetts taxes capital gains differently than federal law โ short-term gains on assets held less than 1 year are taxed as ordinary income, while long-term gains on most assets are taxed at 5% (the same as ordinary income in MA). The surtax adds 4% to any capital gains that push total MA taxable income above $1M. So selling a home or business that triggers a large capital gain in Massachusetts can unexpectedly result in a 9% state tax rate on the gain above $1M.
Is there a way to avoid the surtax if I live in Massachusetts but earn income elsewhere?
The surtax applies to Massachusetts taxable income, which generally tracks with income from Massachusetts sources. If you're a Massachusetts resident, all your worldwide income is subject to MA income tax. If you're a nonresident, only MA-source income applies. Moving out of Massachusetts before a large income event can avoid the surtax if you are no longer a MA domiciliary, but you must genuinely change your domicile (home, family ties, voting registration, etc.) โ this is not a simple task and the MA DOR scrutinizes high-value departures.