Massachusetts’ surtax on high earners — commonly known as the “millionaires tax” — has once again exceeded expectations, generating $3.1 billion in fiscal year 2026 with two months of collections still to be counted.
How the numbers stack up
The state originally budgeted for $2.4 billion in surtax revenue this fiscal year. Instead, collections have already topped $3.1 billion, building on the $3.0 billion collected in fiscal 2025. That’s a substantial jump from the roughly $2 billion a year that outside analysts initially projected when voters approved the measure back in 2022.
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The surtax applies a 4% additional tax on household income above $1 million, with that threshold adjusted upward each year for inflation.
Where the money is going
State lawmakers have directed the revenue toward child-care grants, increased funding for the MBTA, and general budget operations. With collections running well ahead of plan, the Legislature is now budgeting to commit $2.7 billion in surtax revenue next fiscal year — nearly three times the $1 billion originally budgeted when the tax took effect.
The migration question
Critics of the surtax have pointed to high-income residents leaving the state as evidence the policy is backfiring, and some research has tied billions in departed income to the tax’s introduction. But the continued growth in collections complicates that narrative: as one campaign spokesperson put it, the trend suggests “the ultra-rich are clearly staying in Massachusetts” in large enough numbers, and earning enough, to keep pushing revenue higher year after year.
Why it matters
Surtax revenue has become a load-bearing piece of the state budget, particularly for transit and child care. Whether that revenue keeps outperforming will shape how much fiscal room Beacon Hill has in future budget cycles — and how much scrutiny the tax continues to draw from both sides of the debate.
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Background
The Massachusetts surtax was created through a constitutional amendment approved by voters at the ballot in 2022. Supporters often called it the Fair Share Amendment, while it is also widely known as the millionaires tax. Because it is part of the state constitution, changing or repealing it would require another constitutional amendment rather than an ordinary act of the Legislature.
Massachusetts generally taxes most income at a single flat rate. The surtax adds an additional 4 percent on the portion of annual taxable income above the threshold, not on all income. A household with income just above the threshold pays the extra tax only on the amount over it. The threshold is adjusted each year for inflation, as the article notes.
The amendment directs that the revenue be spent, subject to appropriation by the Legislature, on public education and transportation. The Legislature decides the specific uses each year through the budget process, which is how revenue has been allocated to programs such as child care and the MBTA.
The state’s fiscal year runs from July 1 through June 30, which is why fiscal 2026 collections can still be coming in after the end of June. Final figures can take additional time to tally.
What it means for Boston-area readers
For most residents, the surtax does not apply directly, since it affects only income above a high threshold. Its effects show up indirectly through the state budget. Because the revenue is directed to education and transportation, it can influence funding for schools, public colleges, transit and roads.
The debate over the surtax touches on questions economists and policymakers continue to study. Supporters generally argue that it raises revenue for public investments from those most able to pay. Critics generally argue that it may encourage some high earners or businesses to relocate, affecting the state’s long-term tax base. Researchers use tax records, migration data and other sources to examine these questions, and findings can differ depending on methods and time periods. Readers can follow both perspectives through nonpartisan research organizations, state revenue reports and established news coverage.
One-time events can also affect collections. Large capital gains from selling a business or other assets, for example, can produce unusually high income in a single year, which is one reason revenue from high earners can vary from year to year. Financial market conditions, business sales and the timing of large transactions can all influence how much surtax revenue arrives in a given year, which makes it difficult to treat any single year’s collections as a reliable baseline.
Key terms
- Surtax: An additional tax applied on top of an existing tax, often above a certain income level.
- Constitutional amendment: A change to the state constitution, which in Massachusetts can reach the ballot through legislative or citizen-initiated processes.
- Threshold: The income level above which the surtax applies.
- Inflation indexing: Adjusting a dollar amount each year to reflect changes in prices.
- Subject to appropriation: Money directed to a purpose but still requiring the Legislature to approve specific spending.
- Fiscal year: The state’s budget year, running from July 1 to June 30 in Massachusetts.
What to watch
- Final fiscal 2026 surtax collection figures once the full year is tallied.
- Monthly revenue reports from the state Department of Revenue.
- Budget debates over how surtax revenue is allocated in future years.
- Research on income migration and its relationship to state tax policy.
- Reports from nonpartisan budget and tax research organizations.
Quick check: To which portion of income does the Massachusetts 4 percent surtax apply?
- All income for anyone earning over the threshold
- Only the portion of income above the threshold
- All income for every taxpayer
Show answer
B. The surtax applies only to the amount of taxable income above the inflation-adjusted threshold.