Calgary to Denver: Two Flat-Tax Systems, TABOR, and the Energy Corridor

Calgary and Denver are the two energy capitals of the Rocky Mountain West, and they share an outdoor culture and a flat-rate tax philosophy. Alberta's flat 15% provincial bracket becomes Colorado's flat 4.4% state rate: a combined top rate of about 48% becomes about 41.4%. The Denver Julesburg Basin, Colorado's aerospace sector, and the region's tech and finance employers all recruit from Calgary.

Key takeaways

• Alberta's roughly 48% top rate sets the departure tax. On a $300,000 unrealized gain, about $72,000.
• Colorado's flat 4.4%; Denver's Occupational Privilege Tax is a flat monthly amount, not a percentage.
• Colorado starts from federal taxable income, so the treaty's RRSP deferral flows through.
• Alberta's 5% GST becomes 8.81% sales tax in Denver.
• Colorado property tax is among the lowest in the US. AHCIP ends on permanent departure.

The Alberta departure

Departure tax applies to non-registered investments, private company shares, crypto, and foreign property at fair market value on the departure date. Alberta 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 for illiquid assets. A Calgary corporation is deemed sold and becomes a US controlled foreign corporation after the move; wind it up before you go.

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

Calgary oil and gas professionals to Denver's energy companies and the DJ Basin operators, Alberta engineers to Colorado's aerospace sector, Calgary finance staff to Denver's growing financial services employers, and Alberta tech workers to Denver and Boulder.

Worked example

A Calgary reservoir engineer moves to Denver on June 30 with $200,000 of unrealized gain in a non-registered account, $450,000 in an RRSP, and a Calgary home sold in the departure year.

• Departure tax. $200,000 gain, $100,000 taxable, at about 48%: roughly $48,000.
• Home. Sold as a resident under the principal residence exemption.
• RRSP. No tax on departure; federal and Colorado deferral.
• Denver. Combined top rate about 41.4%. GST 5% becomes sales tax 8.81%. Property tax on a $750,000 home around $4,000.

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

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

Alberta's top personal income tax bracket: "15%" on "$362,961.01 and up" (2025). — Government of Alberta, Personal income tax, https://www.alberta.ca/personal-income-tax

Practitioner note

Calgary-to-Denver is the corridor where clients are most surprised by how little changes: two flat systems, similar energy sectors, and a property tax bill lower than Calgary's. The departure tax and the corporate wind-up are the whole file.

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

Next step

Fairlight prepares the Alberta departure return, the corporate wind-up, and the first-year federal and Colorado returns for Denver clients. See cross-border pricing or book a call.