# Why Should Greater Boston Investors Selling Above $1M Care About the MA 4% Surtax — and How Does a 1031 Exchange Defer It?
Key Takeaways
•The second bite: A big Concord sale isn't just a federal tax event. Once your Massachusetts taxable income crosses $1 million, the state generally adds a 4% surtax on top of its base rate — confirm current rates with your CPA.
•It can push you over: The median of the seven recent single-family sales listed below is $1,300,000 (Trulia data), so a strong sale can lift a seller's gain toward that line. The trigger is taxable income, not sale price.
•The fix: A properly structured 1031 exchange generally defers the gain, so both the base rate and the surtax can wait too — as long as you set it up before you close.
•The catch: This helps investment-property owners. It does not help primary-home sellers or anyone who pockets cash from the deal.
My handyman told me about his plan yesterday. He bought a house for $200,000, is sinking another $200,000 into renovations, and expects to flip it for close to $1 million.
His plan: roll the proceeds into a 1031 exchange and defer the tax. One catch — flips often get treated as dealer inventory rather than investment property, which can disqualify them from 1031 treatment entirely. And his exchange isn't even set up yet: no qualified intermediary, no 45-day clock running. He'll need a CPA to confirm eligibility before he counts on any of this.
Most Greater Boston investors brace for the federal tax bill. What they miss is Massachusetts's "second bite." The trigger is taxable income over $1 million, not sale price — but a large gain from a strong Concord sale can easily push a full year's income past that line.
Own an investment property, rental, or flip in Concord or Greater Boston? Then here's the question that actually matters:
Will your sale push your taxable income over $1 million — and if so, can a 1031 exchange help you defer the tax?
Why Are Concord Closings Clustering Above $1M?
The median of the seven recent single-family sales listed below is $1,300,000 (Trulia data). So a typical sale in this sample — not just a mansion — can produce a gain worth planning around. Prices run from $935,000 for 2,744 square feet at 646 Cambridge Tpke to $3,495,000 for 4,409 square feet at 59 Elm St.
Recent Concord Sales: Price Versus Home Size
Plots individual recent Concord transactions by sale price and square footage to show the spread between smaller sub-$1.3M closings and larger luxury sales.
| Category | 1,739 sqft | 2,520 sqft | 2,744 sqft | 1,971 sqft | 4,149 sqft | 3,581 sqft | 4,409 sqft |
|---|---|---|---|---|---|---|---|
| 69 Potter St | $1,125,000 | - | - | - | - | - | - |
| 1547 Main St | - | $1,300,000 | - | - | - | - | - |
| 646 Cambridge Tpke | - | - | $935,000 | - | - | - | - |
| 12-12 Willow St #14 | - | - | - | $999,000 | - | - | - |
| 16 Hatch Farm Ln #16 | - | - | - | - | $2,975,000 | - | - |
| 1030 Sudbury Rd | - | - | - | - | - | $1,850,000 | - |
| 59 Elm St | - | - | - | - | - | - | $3,495,000 |
Here's where people get tripped up. When sellers hear "income over $1 million," they picture salary alone. But under Massachusetts rules, capital gains from a sale generally count as taxable income too, stacking on top of wages, interest, and business income for the year. A strong sale price can feel like a win right up until a large gain quietly pushes you into surtax territory. Confirm the current treatment with your CPA.
What Does the 4% Surtax Actually Cost You?
Massachusetts charges a base flat income tax, and a 4% surtax kicks in on taxable income over $1 million under a recent state law (the Fair Share Amendment). The 5% base rate and 4% surtax used below are illustrative — confirm current rates with your CPA, since a base-rate change is pending (more on that below).
Here's a simple example. Say you have $600,000 of other income this year, plus a $700,000 gain from your sale. That creates $1.3 million in taxable income.
•Base tax at 5% on $1.3M = $65,000
•Surtax at 4% on the $300,000 above $1M = $12,000
•Total Massachusetts bill ≈ $77,000
That extra $12,000 is the second bite — money that could've stayed in your next deal or padded your reserves instead.
And the state bill is only one layer. Federal capital gains tax, the net investment income tax, and depreciation recapture can all stack on top. Ask your CPA to model your combined federal and state burden. If the pending base-rate cut passes, this math shifts, so treat these numbers as time-sensitive.
How Does a 1031 Exchange Defer the Massachusetts Surtax?
Back to my handyman — assuming his property even qualifies as investment property.
A properly structured Section 1031 exchange generally defers the gain, letting an investor sell one investment property and buy another without paying tax right away. You're not avoiding the tax forever, just deferring it. Massachusetts generally follows the federal deferral rules, so when the gain waits federally, the state base tax and surtax can wait too. Confirm the conformity with your CPA.
The timing is unforgiving. You have 45 days to identify a replacement property, the three-property rule limits how many you can name, and the whole exchange must close within 180 days. The table below lists the full statutory limits, including a 15% cap on incidental personal property — meaning only a small slice of the deal, up to 15% of value, can be furniture or other personal property rather than real estate.
Section 1031 Exchange Timing and Numeric Limits
A decision-oriented table of the key deadlines and limits investors must track when planning a like-kind exchange.
| Category | Timing rule | Property limit | Value limit | Timing reference |
|---|---|---|---|---|
| Identification period for replacement property (section 1031(a)(3)) | 45 days | - | - | - |
| Three-property identification rule (limit on number of replacement properties) | - | 3 replacement properties | - | - |
| Incidental personal property aggregate fair market value limitation | - | - | 15 percent | - |
| Reference to 180-day deadline (in commenter example regarding straddling taxable years) | - | - | - | 180th day |
For a larger Massachusetts sale, there may also be a state compliance step, like withholding and a Transferor's Certification. Confirm current requirements with your closing attorney.
The phrase to remember is before closing. Once proceeds hit your account, the exchange is usually dead — no fixing it after the fact. That's exactly why a loose, undecided plan like my handyman's needs its procedural steps locked in early.
Who Can Actually Use This Strategy?
A 1031 exchange is built for investment property — many rentals and commercial properties held for investment or business use qualify. Flips are riskier, since they may be treated as dealer inventory and fail to qualify at all. Confirm your situation with a CPA.
It won't help if you're selling your primary home, and it won't protect any cash you pull out of the deal. That cash is called "boot," and it's often taxable. If your total taxable income stays under $1 million anyway, the surtax never comes into play.
So the real question isn't just your sale price. It's this: what's my gain, what's my total 2026 taxable income, and how much of the gain can I actually defer?
What Are the Strongest Arguments Against Worrying About This?
Let's address the pushback.
"The surtax applies to taxable income over $1M, not the sale price. A $1.1M sale with a high cost basis may barely trigger it."
True enough — the trigger is taxable income, not the number on the sign. But the recent Concord sales listed above cluster well above the line, including $1,300,000 and $3,495,000 sales. For appreciated rentals, long-held assets, or successful flips, the gain can be large enough to push a full year's income over the threshold. You still need exact basis and full-year income to run the numbers, but the exposure is real.
"Massachusetts is proposing to cut the base rate, so the burden may fall."
That proposed cut only touches the base rate. It's phased in over time and still pending, and it does nothing to erase the surtax layered on top. Close in 2026, and you're dealing with the rules in effect then — not some possible future change.
What Should You Do Before You List?
Selling an investment property above $1M in Concord or Greater Boston? Assume the surtax may matter until your CPA proves otherwise.
Don't wait until the closing table. A 1031 exchange has to be set up before you close, which means getting your CPA, qualified intermediary, closing attorney, and real estate advisor aligned early.
Whether you're flipping or selling a long-held rental, the goal is the same: keep your capital working for you instead of handing a large slice to the state today.
Want to know if your Concord or Greater Boston property is likely in surtax territory? Send me the estimated sale price, purchase price, major improvements, and whether it's investment property. I'll help you frame the right questions before you list.
