Montreal to Denver: Three Authorities on the Way Out, a Flat 4.4% on the Way In

Montreal's AI and aerospace sectors feed Denver and Boulder's tech and aerospace employers, and the move is a large tax cut: Quebec's combined top rate of about 53.3% becomes about 41.4% in Colorado. The departure year runs through Revenu Québec, the CRA, and the IRS.

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.
• Colorado's flat 4.4%; no percentage-based city income tax in Denver.
• Colorado follows the treaty's RRSP deferral.
• Quebec's 14.975% combined GST and QST becomes 8.81% sales tax in Denver. 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 Colorado resident is taxable only in the US federally and eligible for Colorado's pension subtraction.

Denver's side

Flat 4.4% state income tax (TABOR surplus years can temporarily lower it); Denver's Occupational Privilege Tax is a flat few dollars a month rather than a percentage; 8.81% sales tax in the City of Denver; property tax among the lowest in the US at roughly 0.5% effective; no estate tax. Colorado also subtracts up to $24,000 of pension and annuity income for taxpayers 65 and older ($20,000 from 55 to 64), which covers RRIF and CPP income.

The RRSP in Colorado

Federally deferred under Article XVIII of the treaty and deferred for Colorado because the state starts from federal taxable income. Withdrawals face 25% Canadian withholding on lump sums, 15% on periodic RRIF payments within the treaty limit, a US foreign tax credit federally, and Colorado's flat rate after the pension subtraction.

Who makes this move

Montreal AI researchers to Boulder and Denver's tech firms, Quebec aerospace engineers to Colorado's space and satellite companies, Montreal outdoor-industry professionals to Denver's recreation brands, and Quebec finance staff to Denver's financial services employers.

Worked example

A Montreal aerospace engineer moves to Denver on July 31 with $180,000 of unrealized gain in a non-registered account, $350,000 in an RRSP, and a Rosemont 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.
• RRSP. No tax on departure; federal and Colorado deferral.
• Denver. Combined top rate about 41.4%. Sales tax 14.975% becomes 8.81%.

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/

The subtraction is generally limited to $20,000 each year or, for individuals age 65 or older, $24,000. — Colorado Department of Revenue, Social Security, Pensions and Annuities, https://tax.colorado.gov/income-tax-topics-social-security-pensions-and-annuities

Practitioner note

Colorado is one of the friendlier states for a Quebec retiree: QPP and RRIF income both fall inside the pension subtraction after 55. The TP-1 departure date is the item that gets missed on the way out.

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, and the first-year federal and Colorado returns for Denver clients. See cross-border pricing or book a call.