Moving from Canada to Idaho: A Flat Tax, the Boise Boom, and a Short Drive from Alberta and BC

Boise has become one of the fastest-growing tech and manufacturing cities in the US, anchored by Micron and a growing software sector, and Alberta and BC residents can drive there. Idaho's tax picture is a flat income tax cut several times in recent years, no local income taxes, low property tax, and a 6% sales tax.

Key takeaways

• Idaho's flat income tax is 5.3% after the 2025 cut. No local income taxes.
• Idaho starts from federal taxable income, so the treaty's RRSP deferral flows through.
• Sales tax is 6% statewide with limited local additions.
• Property tax is near 0.6% effective with a homeowner's exemption.
• No estate tax.

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.

Idaho's side

Flat income tax of 5.3% after the 2025 reduction; no local income taxes; 6% sales tax with small local option taxes in resort towns; property tax near 0.6% effective with a homeowner's exemption on the first portion of assessed value; no estate tax. Idaho starts from federal taxable income and taxes capital gains as ordinary income, with a deduction for gains on certain Idaho property.

The RRSP

Federally deferred under Article XVIII of the treaty and deferred for Idaho 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 Idaho's flat rate.

Who makes this move

Alberta and BC engineers to Micron and Boise's semiconductor and manufacturing sector, Canadian software developers to Boise's tech scene, Alberta agribusiness professionals to Idaho's food processing industry, and Canadian outdoor-industry staff to Idaho's recreation economy.

Worked example

A Calgary semiconductor engineer moves to Boise 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 Idaho deferral.
• Boise. Combined top rate about 42.3%. GST 5% becomes sales tax 6%. Property tax on a $600,000 home around $3,600.

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 income tax rate for 2025 is 5.3% on Idaho taxable income." — Idaho State Tax Commission, Individual Income Basics Guide, https://tax.idaho.gov/taxes/income-tax/individual-income/online-guide/

"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

Idaho's flat rate has been cut in most recent years, and relocation packages are often built on last year's number. We confirm the current rate before modelling the move.

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.