Montreal to Boston: Biotech, the TP-1, and Massachusetts's Flat 5%

Montreal and Boston are the two largest life-sciences clusters in the Northeast, and researchers, clinicians, and biotech executives move between them constantly. The tax picture is a large cut: Quebec's combined top rate of about 53.3% becomes about 42% in Massachusetts. The departure year runs through Revenu Québec, the CRA, and the IRS, and Massachusetts has its own views on the RRSP and the estate.

Key takeaways

• Two Canadian departure returns: the federal T1 and Revenu Québec's TP-1, with matching departure dates.
• Quebec's roughly 53.3% top rate sets the departure tax. On a $300,000 unrealized gain, about $80,000.
• Massachusetts taxes most income at a flat 5%, plus a 4% surtax above roughly $1.1 million; short-term gains at 8.5%.
• Massachusetts's conformity to the treaty's RRSP deferral should be confirmed.
• Quebec's 14.975% combined GST and QST becomes 6.25% sales tax. RAMQ ends on departure.

The three-authority departure

The federal deemed disposition applies to non-registered investments, private company shares, crypto, and property outside Canada; Quebec mirrors it. Report on federal Form T1243 (with T1161 if the property list exceeds $25,000) and on the Quebec equivalents. RAMQ ends when you leave Quebec to settle outside Canada. QPP paid later to a Massachusetts resident is taxable only in the US federally; Massachusetts follows federal treatment of Social Security-type benefits.

Boston's side

Flat 5% on most income with a 4% surtax above the indexed threshold; short-term gains at 8.5%; no city income tax; 6.25% sales tax with no local additions; property tax near 1% to 1.2%; estate tax above $2 million with rates to 16%.

The RRSP in Massachusetts

Federally deferred under Article XVIII of the treaty. Massachusetts applies its own rules to treaty-exempt income; confirm the RRSP position before assuming state deferral, and if the state does not defer, restructure or draw down before departure while still a Quebec resident.

Equity

Biotech compensation includes options and RSUs that vest over years. Vests after the move are split between Canada and the US by working days; Quebec sources its share for the departure year. Both payrolls may withhold on the full amount.

Who makes this move

Montreal biotech researchers and executives to Kendall Square, McGill and Université de Montréal clinicians to the Boston hospital systems, Quebec AI researchers to Boston's AI and robotics firms, and Montreal aerospace engineers to the region's defence contractors.

Worked example

A Montreal biotech scientist moves to Cambridge on August 31 with $180,000 of unrealized gain in a non-registered account, $350,000 in an RRSP, options vesting after the move, and an Outremont condo sold in the departure year.

• Departure tax. $180,000 gain, $90,000 taxable, at about 53.3%: roughly $48,000 across the T1 and TP-1.
• Condo. Sold as a resident under the principal residence exemption on both returns.
• Options. Vests split by working days; Quebec's share on the TP-1.
• RRSP. Federally deferred; Massachusetts position documented.
• Boston. Combined top rate about 42%. 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

Revenu Québec sets out the income tax obligations of individuals who cease to be resident in Québec, including the deemed disposition of property on departure. — Revenu Québec, Leaving Québec, https://www.revenuquebec.ca/en/citizens/your-situation/residence-status-and-tax-obligations/leaving-quebec/

Only the portion of a taxpayer's taxable income that exceeds the surtax threshold for a tax year will be subject to the 4% surtax; the threshold for Tax year 2026 is $1,107,750. — Massachusetts Department of Revenue, 4% Surtax on Taxable Income, https://www.mass.gov/info-details/massachusetts-4-surtax-on-taxable-income

Practitioner note

Montreal-to-Boston is a four-authority file for the departure year: Revenu Québec, the CRA, the IRS, and the Massachusetts Department of Revenue. Each has a view on the RRSP, and only two of them agree. We document the Massachusetts position in the first-year file so it is defensible if questioned.

See also: Weighing Florida instead? See the Canada-to-Florida guide, or the same city's Montreal to Miami guide.

Next step

Fairlight prepares the T1, the TP-1, the RRSP position, and the first-year federal and Massachusetts returns. See cross-border pricing or book a call.