Moving from Canada to Idaho: State Tax, the Boise Tech Boom, and Cross-Border Planning

Idaho charges a flat 5.8% state income tax on all taxable income, a change from the old graduated brackets that took effect under HB 292 in 2023. There are no local or city income taxes anywhere in the state, so the 5.8% is the whole state-level story once you know your taxable income. For Canadians leaving Calgary or the BC interior for Boise, the appeal isn’t just the rate. Boise has become a real tech hub, home to Micron’s semiconductor operations, a large HP presence, and Albertsons’ corporate headquarters, and it’s pulled in a steady stream of remote workers and relocating companies from California and Washington. The state tax layer is simple. The federal cross-border obligations that come with leaving Canada are not, and they apply the same way regardless of which state you land in.

How does Idaho’s flat tax compare to Alberta and BC?

Idaho’s 5.8% flat rate applies from the first dollar, with no brackets to work through. Here’s how that stacks up against the provincial rates you’d be leaving:

Province	Top marginal provincial rate	Income where it kicks in
Alberta	15%	$355,845+
BC	20.5%	$252,752+
Ontario	~20.5% (including surtax)	$220,000+
Idaho	5.8% (flat)	All income

On $200,000 of employment income, BC’s provincial tax alone would run somewhere around $20,000 to $23,000. Idaho’s flat rate on the same income produces about $11,600. Alberta is closer, since it already has the lowest top provincial rate in Canada, but Idaho still comes in meaningfully lower once you’re past the first bracket. The federal comparison (US federal brackets against combined federal-provincial rates) is its own separate question, but the provincial-to-state shift is usually the most visible part of the move for Alberta and BC movers.

Why are Canadians moving to the Boise tech hub?

Boise has picked up the nickname “Silicon Valley of Idaho” for a reason. Micron Technology, one of the largest semiconductor manufacturers in the world, is headquartered there and has been expanding its Boise manufacturing footprint significantly. HP maintains a substantial presence in the area, and Albertsons, the grocery chain, runs its corporate headquarters out of Boise. Beyond the anchor employers, the metro has drawn a wave of tech workers and companies relocating from the Bay Area and Seattle, chasing lower housing costs and a smaller, calmer city with quick access to mountains. Boise has consistently ranked among the fastest-growing metro areas in the country, and the outdoor culture (skiing at Bogus Basin, mountain biking in the foothills) is a close match for what people are leaving behind in Calgary or Kelowna, just at a fraction of BC’s cost of living.

For a Canadian tech worker, this matters beyond lifestyle. A local job market with real depth in semiconductors and tech means options if you change employers, rather than being tied to a single relocating company or a remote arrangement that could get renegotiated.

How does Idaho treat the RRSP?

Idaho computes its tax starting from federal taxable income, with a set of state-specific adjustments layered on top. The RRSP treaty deferral under Article XVIII keeps the annual growth inside the RRSP out of federal taxable income (once you’ve made or are deemed to have made the election), and Idaho doesn’t have an addback for it. In practice, RRSP growth stays untaxed at both the federal and Idaho level while the plan remains deferred.

When you eventually take RRSP withdrawals, they show up in federal taxable income and carry through to Idaho’s return at the flat 5.8% rate, same as any other income. This is a much simpler outcome than states that decouple from the treaty and tax RRSP growth as it accrues.

The TFSA doesn’t get the same treatment. It’s a foreign trust for US purposes regardless of what state you live in, which means ongoing Form 3520/3520-A filings and US tax on the internal growth. The standard advice still holds: collapse the TFSA before you leave Canada rather than carrying that reporting burden forward.

What happens on the Canadian side when I leave?

The move to Idaho doesn’t change anything about the Canadian exit. The standard departure sequence applies:

• Deemed disposition of worldwide assets at fair market value on the departure date (with exceptions for Canadian real property, pension plans, and a handful of other excluded categories)
• A final Canadian return covering January 1 through your departure date
• Provincial tax at the rates of the province you were resident in on departure day, whether that’s Alberta or BC
• T1161 and T1243 if the property you owned at departure was worth more than $25,000
• A decision on the RRSP (leave it in place, since the treaty deferral applies) and the TFSA (generally collapse it before leaving)
• Updating CRA with your new address and non-resident status
• An optional NR73 filing to document your departure date for the record

What about Idaho’s other taxes?

Outside the flat income tax:

Sales tax. Idaho’s state sales tax is 6%, and most of the state doesn’t add local sales tax on top of it. A handful of resort cities are the exception, adding up to an extra 3% on lodging and certain non-essential purchases within city limits. Groceries are taxable in Idaho, which puts it in a small minority of states that tax food at the register, but Idaho offsets this with a grocery tax credit of roughly $100 per person, claimed on the state return regardless of whether you owe tax.

Property tax. Idaho property taxes run moderate by US standards, with effective rates typically in the 0.6% to 0.7% range of market value. Idaho also has a homeowner’s exemption that shields up to 50% of assessed value (capped at $125,000) from taxation on a primary residence, which meaningfully lowers the bill on an owner-occupied home compared to the sticker rate.

Estate tax. Idaho has no state estate tax and no inheritance tax. The only estate tax exposure is the federal estate tax, which applies above $13.61 million for US citizens and residents, or the much lower $60,000 threshold for non-citizens without treaty relief. This is simpler than a state like Washington, which layers its own estate tax on top of the federal one.

Retirement income. Idaho allows a deduction for qualifying retirement benefits, up to roughly $40,758 for single filers and $61,138 for joint filers from qualifying pension plans. Social Security follows the federal treatment and isn’t separately taxed by the state.

How does Idaho compare to Washington, Oregon, and Utah?

Idaho sits in the middle of a Pacific Northwest cluster with very different tax structures. Washington has no personal income tax at all, but makes up for it with a business and occupation tax on gross receipts, a higher combined sales tax, and its own state estate tax starting at $2.193 million. Oregon has no sales tax but income tax brackets that reach 9.9%, among the highest in the country, which usually outweighs the sales tax savings for anyone earning a solid income. Utah runs its own flat tax at 4.55%, slightly lower than Idaho’s 5.8%, and has built its own tech corridor around Silicon Slopes near Salt Lake City.

For a Canadian choosing between these, Idaho lands as a reasonable middle ground: lower and simpler than Oregon, an actual income tax (unlike Washington) but without Washington’s B&O tax or estate tax exposure, and a slightly higher flat rate than Utah in exchange for the Boise job market and cost of living.

What should I do next?

The Canadian exit checklist doesn’t change based on which US state you’re headed to, so start there. On the Idaho side, the main planning items are timing the move to control the part-year split, deciding what to do with the RRSP and TFSA before departure, and setting up US filings (including FBAR and FATCA) starting in the year you arrive.

• Departure tax checklist, the full Canadian exit sequence
• US-Canada tax treaty explained, how Article XVIII and other provisions apply
• RRSP and TFSA on a US move, federal treatment and reporting for both accounts
• First US tax return after moving from Canada, the arrival-year mechanics
• State income tax for cross-border filers, comparing Idaho to other destination states
• Canadian departure tax (T1161/T1243), the deemed disposition forms
• Moving from BC to Washington State, the no-income-tax neighbor
• Moving from Canada to Utah, the other flat-rate tech corridor
• Moving from Canada to Oregon, the high-bracket, no-sales-tax neighbor
• Moving from Canada to Montana, the neighboring no-sales-tax state
• Moving from BC to California, for comparison against a high-tax destination

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.