Massachusetts Commercial Real Estate Tax Guide — 2026
Massachusetts Millionaire's Tax: What Commercial Property Owners Need to Know in 2026
The 2026 surtax threshold is $1,107,750. A single commercial property sale in Massachusetts can push your total taxable income well above it — adding a 4% state surtax on top of your standard capital gains rate. Here is what you need to know before you list.
Informational only. Not legal or tax advice. Consult a qualified CPA before making decisions.
Background
What Is the Massachusetts Millionaire's Tax?
The Massachusetts Millionaire's Tax — formally known as the Fair Share Amendment — is a constitutional amendment passed by Massachusetts voters in November 2022 and effective beginning tax year 2023. It imposes an additional 4% surtax on all Massachusetts taxable income above an annually adjusted threshold.
For commercial property owners, the critical point is this: the surtax applies to all taxable income — including capital gains from the sale of commercial real estate. Because commercial property transactions frequently involve multi-million-dollar valuations, a single sale can easily push a seller's total annual taxable income far above the threshold, triggering the surtax on a substantial portion of the gain.
How It Works
How the Massachusetts Millionaire's Tax Applies to a Commercial Property Sale
The surtax does not apply to the entire gain from your sale — only to the portion of your total annual taxable income that exceeds the threshold. But for most commercial property sellers, the distinction matters less than you might think.
Here is how the calculation works in practice. Assume you are a Massachusetts resident who earns $200,000 in ordinary income in 2026 and sells a commercial building for a $2,000,000 long-term capital gain:
| Income Component | Amount | Notes |
|---|---|---|
| Ordinary income (wages, etc.) | $200,000 | Part B income |
| Long-term capital gain from sale | $2,000,000 | Part C income |
| Total taxable income | $2,200,000 | |
| 2026 surtax threshold | $1,107,750 | Adjusted annually for inflation |
| Income subject to 4% surtax | $1,092,250 | $2,200,000 − $1,107,750 |
| Additional surtax owed | $43,690 | $1,092,250 × 4% |
In this example, the seller owes an additional $43,690 in Massachusetts surtax — on top of the standard 5% Massachusetts long-term capital gains rate and all applicable federal taxes. For short-term gains or sellers with higher ordinary income, the surtax exposure is even larger.
2026 Tax Rates
Massachusetts Capital Gains Tax Rates for Commercial Property Sellers in 2026
The following table shows the effective Massachusetts state tax rates on capital gains from commercial real estate sales, combining the base rate with the Millionaire's Tax surtax for income above the 2026 threshold.
| Gain Type | Holding Period | Base MA Rate | + Surtax (above $1,107,750) | Max Effective MA Rate |
|---|---|---|---|---|
| Long-Term Capital Gain | More than 1 year | 5.0% | + 4.0% | 9.0% |
| Short-Term Capital Gain | 1 year or less | 8.5% | + 4.0% | 12.5% |
These Massachusetts rates apply in addition to federal capital gains tax (0–20%), depreciation recapture (up to 25%), and the Net Investment Income Tax (3.8% for high earners). For a seller with a large long-term gain, the combined federal and state effective rate can exceed 32% before any planning strategies are applied. Learn how depreciation recapture adds another layer at up to 25% →
New for 2025–2026
Massachusetts Real Estate Withholding: What Changed on November 1, 2025
Effective November 1, 2025, Massachusetts introduced a significant new withholding requirement for real estate transactions. Commercial property owners selling in 2026 must understand this rule before closing.
What the New Rule Requires
For any real estate sale in Massachusetts with a gross sales price of $1 million or more, the settlement agent is now required to:
- File a withholding return with the Massachusetts Department of Revenue within 10 days of closing.
- Remit the applicable withholding payment via MassTaxConnect.
- Collect a completed Transferor's Certification from the seller before closing.
How the Withholding Amount Is Calculated
For individual sellers, the withholding rate ranges from 4% to 9% depending on the method chosen:
Gross Sales Price Method
Withholding is calculated on the full gross sales price. If the gross price exceeds the surtax threshold, an additional 4% is withheld on the amount above $1,107,750. This is the simpler method but may result in over-withholding.
Estimated Net Gain Method
Withholding is calculated on the seller's estimated net gain (sale price minus adjusted basis). This method typically results in lower withholding and requires the seller to provide supporting documentation on the Transferor's Certification.
Key Exemptions
Withholding is not required for certain transfers, including:
- 1031 Exchanges: Withholding is generally not required to the extent that gain is being deferred in a qualifying like-kind exchange. The seller must identify the deferred gain amount on the Transferor's Certification and consent to Massachusetts jurisdiction for future tax collection.
- Pass-through entities: Transfers by pass-through entities (LLCs, partnerships, S-corps) are generally exempt from withholding at the entity level.
- Principal residences: Transfers of a seller's principal residence are exempt to the extent the gain qualifies for the federal home sale exclusion.
- Installment sales: Sellers may elect to have withholding apply only to the initial payment rather than the full sale price, provided they consent to Massachusetts jurisdiction for future installments.
Planning Strategies
Three Strategies to Reduce Your Massachusetts Millionaire's Tax Exposure
The Millionaire's Tax is not unavoidable — but it requires planning that begins before the property goes to market. Here are the three most effective strategies available to Massachusetts commercial property owners.
1031 Like-Kind Exchange
A properly structured 1031 exchange defers the capital gain entirely — meaning the gain never enters your taxable income calculation for the year of sale, and the surtax does not apply to the deferred amount. This is the most powerful tool available for sellers who wish to remain invested in real estate. It requires a Qualified Intermediary and strict adherence to the 45-day identification and 180-day closing rules. Read our complete guide to 1031 exchanges in Massachusetts →
Installment Sale
An installment sale spreads the recognition of gain across multiple tax years. If each annual installment payment keeps your total taxable income below the $1,107,750 threshold, the 4% surtax may not apply to those installments. Under the new withholding rules, sellers can elect to have withholding apply only to the initial payment. This strategy requires careful modeling with a CPA before the sale closes.
Transaction Timing
If you have significant other income in a given year, closing a sale in a lower-income year can reduce the amount of gain subject to the surtax. Conversely, if you are planning a sale and also have other large income events (a business sale, retirement distributions, etc.), coordinating the timing of those events with your CPA can meaningfully reduce your surtax exposure.
Frequently Asked Questions
Massachusetts Millionaire's Tax: Common Questions from Commercial Property Owners
Work with MANSARD
Know Your Tax Exposure Before You Decide to Sell
The Massachusetts Millionaire's Tax is one of several tax layers that determine what you actually walk away with after selling a commercial property. At MANSARD, we help owners understand the full picture — before anything goes to market.
While we do not provide legal or tax advice, we work closely with your CPA and legal team to ensure your real estate strategy accounts for your full tax exposure. We help you think through what your property is worth in today's market, how deal structure and timing affect your net proceeds, and whether selling now — or holding, exchanging, or using an installment structure — is the right move for your situation.
- Understand your property's true market value before you decide
- Model net proceeds across multiple tax and deal structure scenarios
- Identify the right buyers who will pay the most and close with confidence
- Build a strategy that protects the capital you have spent years creating
Schedule a Pre-Sale Strategy Call
A short, confidential conversation to understand your property's value, your tax exposure, and what your best move actually is — before you commit to anything.
Schedule a Pre-Sale Strategy Call Call (617) 674-2043Confidential. No obligation. Just insight.
Sources: Massachusetts Department of Revenue, "Massachusetts 4% Surtax on Taxable Income," mass.gov (2026 threshold: $1,107,750). DarrowEverett LLP, "Massachusetts Real Estate Transfers Over $1M Face New Tax Rules," October 2025. Sachetta LLC, "Capital Gains Taxes in 2026: What to Know," March 2026.
MANSARD Commercial Properties · 18 Spring Grove Road, Andover, MA 01810 · (617) 674-2043 · masscommercialproperties.com
Jeremy Cyrier, CCIM, CRE — Licensed in Massachusetts and New Hampshire.