1031 Exchange for Boston Investment Property Sellers

A 1031 exchange lets you defer federal capital gains tax when you sell investment or business real estate and reinvest in other like-kind real estate. Massachusetts follows the federal treatment, so the state tax on the gain is deferred too. You have 45 days after the sale closes to identify replacement property in writing and must receive it within 180 days, or by your tax return due date if that comes first. Triple-deckers, two-families, and other rental real estate across Dorchester, Jamaica Plain, Roslindale, Hyde Park, and Roxbury can qualify if held for investment or business use rather than as your home.

How does a 1031 exchange work for Boston investment property sellers?

You sell investment real estate, a qualified intermediary holds the proceeds, and you buy like-kind replacement property within strict deadlines to defer the federal and Massachusetts tax on the gain. If you're weighing an exchange, start with the tax picture. See capital gains tax when selling a Massachusetts home for the state context, and selling a two-family or three-family home in Boston for how a straight sale compares.

Key Takeaways

• You have 45 days after the sale to identify replacement property in writing and 180 days to receive it, or your tax return due date if earlier.
• Both properties must be held for investment or business use; your own home does not qualify.
• A qualified intermediary must hold the sale proceeds, and your real estate agent, attorney, or accountant from the past two years can't serve in that role.
• Cash received or debt relief, called boot, is taxable up to the amount of your gain.
• In the 12 months through August 2026, Dorchester multi-families sold at a median of $1,200,000, so a long-held building can carry a large gain.

What property qualifies for a 1031 exchange?

Real property held for use in a trade or business or for investment. Since 2018, like-kind exchange treatment applies only to real property held for use in a trade or business or for investment. Property held primarily for sale, such as a flip, does not qualify, and partnership interests generally don't count as real property. Both the property you sell and the property you buy must be held for investment or business use, but they don't need to be the same type. A Dorchester triple-decker can be exchanged into a single-family rental in Roslindale or a small commercial building.

Your own home does not qualify. If you live in one unit of a multi-family and rent the others, only the rental portion can be exchanged. That split gets complicated, so talk with a tax professional and a qualified intermediary before you list.

What are the 1031 exchange deadlines and intermediary rules?

45 days to identify, 180 days to close, and a qualified intermediary holding the funds.

45 days to identify. You must identify replacement property in a written document you sign and deliver, by midnight of the 45th day after you transfer the property you're selling, to the seller of the replacement property or another party to the exchange who isn't a disqualified person, such as your qualified intermediary. These are calendar days, and weekends and holidays count. The regulations limit how many properties you can identify:

• Three-property rule: up to three properties, regardless of value.
• 200% rule: any number of properties, as long as their total fair market value doesn't exceed 200% of the value of the property you sold.
• 95% exception: if you identify more than either rule allows, the identification still works only if you acquire at least 95% of the total value of everything you identified.

180 days to close. You must receive the replacement property within 180 days of the sale, or by the due date (including extensions) of your tax return for that year, whichever is earlier. Both deadlines start on the same day, so a slow search leaves less time to close the second purchase: identify on day 45 and you have 135 days left. Missing either deadline generally means the gain is taxable.

A qualified intermediary holds the funds. You should not receive the sale proceeds yourself. A qualified intermediary holds them between the sale and the purchase. If you receive or control the funds, the exchange can fail. Under the IRS regulations, anyone who acted as your agent in the two years before the sale, including your real estate agent or broker, attorney, accountant, or employee, can't serve as your intermediary, apart from routine title, escrow, or exchange-only services; related parties can't either. Set this up before your sale closes.

Boot and debt relief. Cash or other non-like-kind property you receive, called boot, is taxable up to the amount of your gain. Debt you are relieved of, such as the mortgage paid off at your sale, is generally treated like cash received. To defer the full gain, most investors buy property of equal or greater value and replace the debt with new financing or added cash. Confirm the math with your tax advisor.

How much tax can a 1031 exchange defer on a Boston multi-family?

It depends on your gain, basis, and income, and on a long-held building it can be large. Multi-family values are high across these neighborhoods. In the 12 months through August 2026, Dorchester multi-families sold at a median of $1,200,000 (199 sales) and Jamaica Plain multi-families at $1,430,000 (35 sales), so a long-held building can carry a large gain.

Here is a simplified example with round numbers. You sell a three-family for a net $1,000,000 after selling costs. Your adjusted basis is $550,000, after $150,000 of depreciation. Your gain is $450,000. Federally, the $150,000 tied to depreciation is taxed at up to 25% (up to $37,500), the other $300,000 at 15% or 20% depending on income ($45,000 or $60,000), and the 3.8% net investment income tax may apply above the IRS income thresholds (up to $17,100). At the top rates, that is about $114,600 in federal tax before Massachusetts income tax, and Massachusetts adds a 4% surtax on income above $1,000,000, adjusted each year for inflation. A completed exchange defers those taxes. Your numbers depend on your basis, depreciation, and income, so run them with your accountant.

If the property has tenants, you'll also be coordinating tenant notices and showings on the sale while searching for and underwriting a replacement within the 45-day window.

FAQ

Can I do a 1031 exchange on a triple-decker I live in and also rent out?

Only the rental portion qualifies. Splitting an owner-occupied multi-family into an exchangeable rental share and a personal residence share is complicated, so get guidance from a tax professional before you list.

What happens if I cannot find a replacement property within 45 days?

If you don't identify replacement property in writing within 45 days of your sale, the exchange generally fails and the gain is taxable as if no exchange had occurred. That's why it helps to have realistic replacement candidates in view before you close.

Do I need a lawyer or just a qualified intermediary for a 1031 exchange in Massachusetts?

They are separate roles. The closing attorney handles the deed, title, and closing, while the qualified intermediary holds the proceeds and documents the exchange. Many investors also have their own attorney and accountant review the exchange. The intermediary must be in place before your sale closes.

Does a 1031 exchange defer Massachusetts state tax as well as federal tax?

Yes. Massachusetts personal income tax follows the Internal Revenue Code as amended on January 1, 2024, which includes section 1031, so a valid exchange defers the Massachusetts tax as well as the federal tax.

Is a 1031 exchange worth it for a smaller two-family investment property?

It can be. Size alone doesn't decide it. Compare your gain and the tax you'd defer with the intermediary's fee, the added complexity, and the tight timeline, and run the numbers with your accountant before you list. Juan Murray can help you weigh a sale against your replacement options; see selling an investment property.

The bottom line: a 1031 exchange can defer both federal and Massachusetts tax on a Boston investment sale, but only if the intermediary is in place before closing and you meet the 45-day and 180-day deadlines.

Sources

• MLS Property Information Network (MLS PIN) via Repliers, September 2025 through August 2026
• IRS Instructions for Form 8824, Like-Kind Exchanges
• 26 CFR 1.1031(k)-1, Treatment of deferred exchanges (Cornell LII)
• IRS Topic 409, Capital gains and losses
• IRS Topic 559, Net investment income tax
• M.G.L. c.62 §1, definition of the Code for Massachusetts income tax
• M.G.L. c.62 §4, Massachusetts income tax rates and 4% surtax

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About Juan Murray

Juan Murray is a Boston broker associate with more than 30 years of experience helping buyers, sellers, and investors across Greater Boston, personally leading every transaction from the first conversation through closing.

RE/MAX Real Estate Center · (978) 581-0801

Equal Housing Opportunity. Juan Murray is licensed as a Broker in Massachusetts, regulated by the Massachusetts Board of Registration of Real Estate Brokers and Salespersons. This article is general information only and does not constitute legal, tax, or financial advice. Confirm your specific costs and obligations with your closing agent, tax advisor, or lender.