Dentist cross-border tax: closing out the US chapter of your career

The move home sets the table

Canadian dentists who trained in the US usually come home with three loose ends: student debt in US dollars, a retirement account tied to a US address, and a final US tax return nobody warned them about. The year you re-establish Canadian residency is when each of these is cheapest to deal with.

On arrival, Canada treats most of your property as newly acquired at fair market value, so gains that built up in a US brokerage account during school and associateship years never face Canadian tax. On the US side, your departure year is typically a dual-status return — resident for the months you worked, non-resident after — and it is the last 1040-series filing most people need. The exception is a green card, which keeps US worldwide filing obligations alive until it is formally surrendered. That is a decision to make deliberately, not by default.

The 401(k) or IRA you left behind

You have three realistic choices, none of them urgent — but each follows a different tax path.

The 60(j) route has fine print worth respecting. A 401(k) qualifies when the balance reflects services you performed while you were not a Canadian resident; an IRA qualifies as a lump sum built from your own or a spouse's contributions; and the RRSP deposit must land in the year of withdrawal or within 60 days after it. Roth IRAs are excluded entirely — for a Roth, the play is a one-time treaty election filed with your first resident-year return, and no contributions ever again from Canada.

US student debt, paid from a Brampton practice

The awkward truth first: Canada gives no tax relief for US student loan interest. The federal credit is reserved for loans made under Canadian government student-aid programs, so a US dental-school loan earns nothing on your T1 — and your Dentistry Professional Corporation cannot take over a personal debt just because the education produced its revenue.

What we can plan is the flow: compensation from the DPC sized so the USD payments clear comfortably, without pulling more out of the corporation than tax efficiency allows, and attention to the exchange rate, because the loan is fixed in a currency your patients do not pay in. Our DPC structure guide covers how those compensation choices work inside the corporation.

US CE trips and the occasional US locum

Continuing education in the US stays deductible on ordinary principles: course fees that maintain your professional skills are practice expenses, and convention travel fits within the Income Tax Act's two-conventions-per-year limit. Keep agendas with the receipts — CRA distinguishes a course from a conference from a vacation with a lecture attached.

Actual US work income — a paid lecture, a locum stint across the border — is different. Under the treaty's business-profits article, a Canadian dentist with no fixed US base owes no US federal tax on it, but the exemption is claimed, not assumed: Form 8233 switches off the default 30 percent withholding before payment, and a 1040-NR with Form 8833 documents the treaty position after year-end. State income tax does not always follow the treaty, so we check the state before you accept the engagement.

US investments inside the DPC

Retained earnings in a DPC often end up in US securities, and held directly, that is simple to run: the corporation files Form T1135 once the total cost of its foreign property passes CAD 100,000, a W-8BEN-E gets treaty rates from the US broker, and the 15 percent dividend withholding becomes a credit against Canadian corporate tax.

The line to respect is entities. Put a US LLC or a US subsidiary inside the DPC — a private syndication, a friend's venture, a stateside side business — and you may have created a foreign affiliate whose passive earnings are taxed in Canada as they accrue under the FAPI rules, with credit mismatches layered on top. That is not a reason to say no; it is a reason to price the structure before wiring the money.

Source: CRA — Form T1135, Foreign Income Verification Statement.