A Long-Held Home Can Reach the Surtax Line
Program and regulatory figures verified September 25, 2026. Details change; confirm your scenario with us.
This is the one Massachusetts number most move-up plans never account for, and it only shows up on the largest gains, which is exactly where a move-up plan is most exposed.
The number
Massachusetts publishes its rates plainly. For tax year 2026, income exceeding $1,107,750 carries an additional surtax of 4%. The same page records $1,083,150 for tax year 2025 and $1,053,750 for 2024.
So it is indexed, it moves every year, and it has moved roughly $24,600 between 2025 and 2026. Any figure you read in an article from two years ago is wrong now.
How a home sale reaches a threshold about income
A capital gain is income. When a Massachusetts homeowner sells, the gain above the federal exclusion flows into that year's Massachusetts taxable income, on top of wages and everything else.
For a house bought in the 1990s in a market that has done what Massachusetts has done since, that gain can be a very large number. Add it to an ordinary year's earnings and a household that has never been near $1,107,750 can land above it for one year.
That is the shape of the risk: it is not a wealthy-household problem, it is a long-tenure problem. The people most exposed are often the ones least expecting it.
Why a mortgage site is telling you this
Because of where the money goes. Every buy-before-you-sell structure except keeping the home settles against the sale:
- A bridge loan is repaid in full from the proceeds.
- A second mortgage or equity line taken for the down payment is paid off at that closing.
- A recast on the new mortgage is funded by applying proceeds to principal.
A surtax liability arising from the same sale competes for the same money. A plan built on gross proceeds, or on net proceeds that ignore this, can come up short at exactly the wrong moment. See the net proceeds page.
The timing point, stated carefully
The threshold applies per tax year. A sale that closes in December lands in one year's income; the same sale in January lands in the next, against a different indexed threshold and alongside a different year's earnings.
We are flagging that the tax year matters. We are not advising anyone to move a closing date, and we would not, because the right answer depends on facts we do not have and on a body of law that is not ours. Bring it to your CPA early enough that the answer can still influence the plan.
What this page deliberately does not do
It does not compute your gain. It does not tell you how the federal exclusion applies to your situation, whether you qualify for it, or how much of it you have. It does not recommend a closing date. Those are accountant questions and getting them wrong is expensive.
What it does is make sure the number is in front of you while the financing is still being designed, rather than after. The structure comparison is on the structures page, and the one route that does not realise a gain this year is on the rental conversion page.
Frequently asked questions
What is the Massachusetts 4% surtax threshold?
For tax year 2026, mass.gov states that income exceeding $1,107,750 carries an additional surtax of 4%. The threshold was $1,083,150 for tax year 2025 and $1,053,750 for 2024, so it is indexed and moves annually.
Does a home sale count toward the Massachusetts surtax threshold?
A capital gain above the federal exclusion flows into Massachusetts taxable income for the year of the sale, alongside other income. Whether that carries a particular household over the threshold depends on their facts and is a question for a CPA.
Who is most exposed to this on a move-up?
Long-tenured owners rather than high earners. A home bought decades ago in an appreciating market can produce a gain large enough that an ordinary earnings year lands above the threshold for that one year.
Why would a mortgage lender raise a tax threshold?
Because buy-before-you-sell structures are repaid from net proceeds. A bridge loan is retired from proceeds, a second mortgage is paid off at that closing, and a recast is funded by applying proceeds to principal. A surtax liability from the same sale competes for the same money.
Should I time my Massachusetts closing around the surtax?
That is a question for your CPA, not for us. The threshold applies per tax year, so the year of closing determines which year's income the gain lands in. We flag that it matters; we do not advise on closing dates.
Mike Certo · NMLS #260555 · Cornerstone First Mortgage NMLS #173855 · Equal Housing Lender. Educational content about financing, not a loan commitment and not legal, tax, or real estate advice. The Massachusetts surtax threshold is set by the Commonwealth and indexed annually, and whether a home sale reaches it depends entirely on your facts; your CPA, your closing attorney, and your real estate agent each handle their own part. Loans are subject to borrower and property qualification.