Moving from Canada to Massachusetts: A Flat 5%, the Millionaire's Surtax, and Boston's Biotech and Finance Corridor

Boston is the world's largest biotech cluster, a major asset management centre, and home to more universities per capita than any US city, and it recruits Canadians from every province. Massachusetts's tax picture is a flat 5% income tax with a 4% surtax on income above an indexed threshold ($1,107,750 for 2026), an 8.5% rate on short-term capital gains, no city income tax, a 6.25% sales tax, and an estate tax that starts at $2 million.

Key takeaways

• Massachusetts taxes most income at a flat 5%, plus a 4% surtax above $1,107,750 (the indexed 2026 threshold). Short-term capital gains are taxed at 8.5%.
• No city income tax anywhere in Massachusetts.
• Sales tax is 6.25% statewide; clothing under $175 and most groceries are exempt.
• Property tax is near 1% to 1.2% effective; Boston offers a residential exemption to owner-occupants.
• Massachusetts's estate tax applies above $2 million with rates to 16%. Its conformity to the treaty's RRSP deferral should be confirmed.

The Canadian departure

Departure tax applies to non-registered investments, private company shares, crypto, and foreign property at fair market value on the day you leave. Canadian real estate, RRSPs, TFSAs, and pensions are excluded. Report on Form T1243, list holdings on Form T1161 if the total exceeds $25,000, and post security under Form T1244 to defer tax on illiquid assets. The rate is your province's: on a $300,000 unrealized gain, roughly $72,000 from Alberta and $80,000 from Ontario, Quebec, or BC. Provincial health coverage ends around your departure date; confirm the exact date with your plan and arrange US coverage to start the same month.

US federal side

Dual-status return in the arrival year, FBAR on Canadian accounts above $10,000 aggregate, Form 8938 above thresholds, and the RRSP treaty deferral federally. The TFSA loses its tax-free status the day you become a US person; close it before crossing. Equity compensation vesting after the move is split by working days between Canada and the US.

Massachusetts's side

Flat 5% on most income; 4% surtax above the indexed threshold, $1,107,750 for 2026; short-term capital gains at 8.5%, long-term at 5%; no city income tax; 6.25% sales tax with no local additions; property tax near 1% to 1.2% effective with Boston's residential exemption; estate tax on estates above $2 million with a credit that removes the former cliff and rates to 16%. Massachusetts starts from federal gross income with its own modifications and has its own rules on income excluded by treaty.

The RRSP

Federally deferred under Article XVIII of the treaty. Massachusetts applies its own rules to treaty-exempt income; confirm the RRSP position with the guidance in hand before assuming state deferral, and if the state does not defer, restructure the account toward low-yield holdings or draw it down before departure. Withdrawals face 25% Canadian withholding on lump sums, 15% on periodic RRIF payments within the treaty limit, a US foreign tax credit federally, and Massachusetts's 5%.

Who makes this move

Canadian biotech researchers and executives to Kendall Square, Bay Street asset managers to State Street, Fidelity, and Boston's investment firms, Canadian academics to Harvard, MIT, and the region's universities, Canadian clinicians to Mass General Brigham and the Boston hospitals, and Canadian defence engineers to Raytheon and MIT Lincoln Laboratory.

Worked example

A Montreal biotech executive moves to Cambridge on June 30 with $300,000 of unrealized gain in a non-registered account, $600,000 in an RRSP, options vesting after the move, and a Westmount home sold in the departure year.

• Departure tax. $300,000 gain, $150,000 taxable, at about 53.3%: roughly $80,000 across the T1 and TP-1.
• Home. Sold as a resident under the principal residence exemption on both returns.
• Options. Vests split by working days; Massachusetts taxes its share.
• RRSP. Federally deferred; Massachusetts position documented.
• Cambridge. Combined top rate about 42% (46% above the surtax threshold). Sales tax 14.975% becomes 6.25%.

Official sources

"When you leave Canada, you are considered to have sold certain types of property (even if you have not sold them) at their fair market value (FMV) and to have immediately reacquired them for the same amount. This is called a deemed disposition and you may have to report a capital gain (also known as departure tax)." — Canada Revenue Agency, Leaving Canada (emigrants), https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/individuals-leaving-entering-canada-non-residents/leaving-canada-emigrants.html

"Tax year 2026: For income exceeding $1,107,750, there is an additional surtax of 4%." — Massachusetts Department of Revenue, Massachusetts Tax Rates, https://www.mass.gov/info-details/massachusetts-tax-rates

"You will be considered a United States resident for tax purposes if you meet the substantial presence test for the calendar year. To meet this test, you must be physically present in the United States (U.S.) on at least: 31 days during the current year, and 183 days during the 3-year period that includes the current year and the 2 years immediately before that." — Internal Revenue Service, Substantial Presence Test, https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test

Practitioner note

Massachusetts's estate tax threshold is $2 million with no portability between spouses, and a Canadian couple arriving with a home, an RRSP, and a portfolio is often above it on day one. The 8.5% rate on short-term gains catches active traders who were used to half-inclusion in Canada. Both belong in the first meeting.

Corridor guides

• Calgary to Boston: Energy to Biotech, Massachusetts's Flat 5%, and the Millionaire's Surtax
• Montreal to Boston: Biotech, the TP-1, and Massachusetts's Flat 5%
• Ottawa to Boston: Government to Research, Biotech, and Massachusetts's Flat 5%
• Toronto to Boston: Bay Street to State Street, and Massachusetts's Flat 5%
• Vancouver to Boston: Biotech, Research Talent, and Massachusetts's Flat 5%

See also: Weighing Florida instead? See the Canada-to-Florida guide. Browse every corridor by city, province, and state.

Next step

Fairlight prepares the Canadian departure return, the first-year federal and state returns, and ongoing cross-border filings. See cross-border pricing or book a call.