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Four tax traps American physicians miss when relocating to Canada
Every year roughly 150 U.S.-trained doctors move north permanently. Most clear the regulatory hurdles, LMCC exam, provincial licensure, visa paperwork, and never call a cross-border tax specialist until they're already in trouble. The Canada Revenue Agency and the IRS both want their cut, and the treaty only prevents double taxation if you file correctly. Here's what actually trips people up.
Professional corporations turn into U.S. reporting nightmares
Canadian doctors practice through Medical Professional Corporations to defer tax. Works great locally. The corporation bills OHIP or the provincial health plan, pays the doctor a salary, and retains the rest at the lower corporate rate of 12.2% on the first $500,000 of active business income in most provinces.
U.S. citizens owning foreign corporations trigger Subpart F and Global Intangible Low-Taxed Income rules. The retained earnings you planned to defer get taxed immediately in the U.S. at ordinary income rates, often 35% to 37% federally. You file Form 5471 every year. Miss that filing and the penalty starts at $10,000 per year, per corporation. The IRS considers your MPC a Controlled Foreign Corporation the day you own more than 50% of it, which is the day you incorporate.
Most cross-border planners now tell U.S. citizen doctors not to incorporate in Canada at all. Practice as a sole proprietor, take the income directly, pay the higher Canadian personal rate, claim the Foreign Tax Credit on your 1040, and avoid the compliance cost. The local tax deferral you lose is smaller than the U.S. tax you'd pay on deemed distributions anyway.
Your TFSA is a taxable foreign trust to the IRS
Tax-Free Savings Accounts are the single most popular savings vehicle in Canada. Contributions aren't deductible, growth is tax-free, withdrawals are tax-free. In 2026 the annual limit is $7,000. Cumulative room for someone who's been a Canadian resident since 2009 is now over $95,000.
The IRS does not recognize the TFSA's tax-free status. It treats the account as a foreign grantor trust. Growth inside the account is taxable to you each year as ordinary income. Dividends, interest, capital gains, all reported on your 1040. You file Form 3520 (foreign trust reporting) and Form 3520-A (foreign trust return) annually. Each form carries a penalty for late filing equal to the greater of $10,000 or 35% of the gross value of the trust.
A U.S. citizen doctor in Ontario could contribute $7,000, earn $500 in growth, owe U.S. tax on the $500, and face a $10,000 penalty if they forget Form 3520. The math is ugly enough that most cross-border advisors say don't open one. Use an RRSP instead, the treaty recognizes it, and contributions are deductible in both countries if structured correctly.
Canadian mutual funds are Passive Foreign Investment Companies
Most Canadian investors hold mutual funds or exchange-traded funds. If you're a U.S. citizen, almost all Canadian-domiciled funds are classified as PFICs under IRC Section 1297. The tax treatment is punitive by design.
Gains on PFIC sales are taxed at the highest ordinary income rate. The IRS also imposes an interest charge on the deferred tax liability, calculated from the year you bought the fund. You file Form 8621 for every PFIC you own. A diversified portfolio of twelve Canadian funds means twelve separate 8621s every year.
The mechanics are brutal. Sell a fund after five years, realize a $10,000 gain, and the effective tax rate can exceed 50% once the interest calculation is layered in. U.S.-domiciled ETFs and mutual funds avoid PFIC classification entirely. A U.S. citizen doctor in Canada should hold investments through a U.S. brokerage in U.S.-listed funds, even though it feels backwards.
Estate tax applies even after you move
Canada has no estate tax. The U.S. does. As a U.S. citizen your worldwide estate is subject to federal estate tax regardless of where you live. The 2026 exemption is expected to drop from the current $13.6 million to roughly $7 million when the Tax Cuts and Jobs Act provisions sunset. Estates above that threshold face a 40% marginal rate.
Canada imposes a deemed disposition on death, your estate is treated as if it sold every capital asset the day you died, and pays capital gains tax on the accrued appreciation. Your heirs pay Canadian capital gains tax and U.S. estate tax on the same assets, and the treaty's foreign tax credit doesn't fully eliminate the overlap. A family home in Toronto appreciated from $800,000 to $2.4 million faces Canadian deemed disposition tax on $1.6 million of gain. Your U.S. estate return reports the $2.4 million fair market value and might owe estate tax depending on total estate size.
The fix requires a cross-border will that coordinates both tax regimes and uses tools like bypass trusts or Canadian alter-ego trusts. Most U.S. citizen doctors in Canada need dual legal representation, a Canadian estates lawyer and a U.S. estates lawyer who talk to each other, or the estate pays twice.
Every year roughly 150 U.S.-trained doctors move north permanently. Most clear the regulatory hurdles, LMCC exam, provincial licensure, visa paperwork, and never call a cross-border tax specialist until they're already in trouble. The Canada Revenue Agency and the IRS both want their cut, and the treaty only prevents double taxation if you file correctly. Here's what actually trips people up.
Professional corporations turn into U.S. reporting nightmares
Canadian doctors practice through Medical Professional Corporations to defer tax. Works great locally. The corporation bills OHIP or the provincial health plan, pays the doctor a salary, and retains the rest at the lower corporate rate of 12.2% on the first $500,000 of active business income in most provinces.
U.S. citizens owning foreign corporations trigger Subpart F and Global Intangible Low-Taxed Income rules. The retained earnings you planned to defer get taxed immediately in the U.S. at ordinary income rates, often 35% to 37% federally. You file Form 5471 every year. Miss that filing and the penalty starts at $10,000 per year, per corporation. The IRS considers your MPC a Controlled Foreign Corporation the day you own more than 50% of it, which is the day you incorporate.
Most cross-border planners now tell U.S. citizen doctors not to incorporate in Canada at all. Practice as a sole proprietor, take the income directly, pay the higher Canadian personal rate, claim the Foreign Tax Credit on your 1040, and avoid the compliance cost. The local tax deferral you lose is smaller than the U.S. tax you'd pay on deemed distributions anyway.
Your TFSA is a taxable foreign trust to the IRS
Tax-Free Savings Accounts are the single most popular savings vehicle in Canada. Contributions aren't deductible, growth is tax-free, withdrawals are tax-free. In 2026 the annual limit is $7,000. Cumulative room for someone who's been a Canadian resident since 2009 is now over $95,000.
The IRS does not recognize the TFSA's tax-free status. It treats the account as a foreign grantor trust. Growth inside the account is taxable to you each year as ordinary income. Dividends, interest, capital gains, all reported on your 1040. You file Form 3520 (foreign trust reporting) and Form 3520-A (foreign trust return) annually. Each form carries a penalty for late filing equal to the greater of $10,000 or 35% of the gross value of the trust.
A U.S. citizen doctor in Ontario could contribute $7,000, earn $500 in growth, owe U.S. tax on the $500, and face a $10,000 penalty if they forget Form 3520. The math is ugly enough that most cross-border advisors say don't open one. Use an RRSP instead, the treaty recognizes it, and contributions are deductible in both countries if structured correctly.
Canadian mutual funds are Passive Foreign Investment Companies
Most Canadian investors hold mutual funds or exchange-traded funds. If you're a U.S. citizen, almost all Canadian-domiciled funds are classified as PFICs under IRC Section 1297. The tax treatment is punitive by design.
Gains on PFIC sales are taxed at the highest ordinary income rate. The IRS also imposes an interest charge on the deferred tax liability, calculated from the year you bought the fund. You file Form 8621 for every PFIC you own. A diversified portfolio of twelve Canadian funds means twelve separate 8621s every year.
The mechanics are brutal. Sell a fund after five years, realize a $10,000 gain, and the effective tax rate can exceed 50% once the interest calculation is layered in. U.S.-domiciled ETFs and mutual funds avoid PFIC classification entirely. A U.S. citizen doctor in Canada should hold investments through a U.S. brokerage in U.S.-listed funds, even though it feels backwards.
Estate tax applies even after you move
Canada has no estate tax. The U.S. does. As a U.S. citizen your worldwide estate is subject to federal estate tax regardless of where you live. The 2026 exemption is expected to drop from the current $13.6 million to roughly $7 million when the Tax Cuts and Jobs Act provisions sunset. Estates above that threshold face a 40% marginal rate.
Canada imposes a deemed disposition on death, your estate is treated as if it sold every capital asset the day you died, and pays capital gains tax on the accrued appreciation. Your heirs pay Canadian capital gains tax and U.S. estate tax on the same assets, and the treaty's foreign tax credit doesn't fully eliminate the overlap. A family home in Toronto appreciated from $800,000 to $2.4 million faces Canadian deemed disposition tax on $1.6 million of gain. Your U.S. estate return reports the $2.4 million fair market value and might owe estate tax depending on total estate size.
The fix requires a cross-border will that coordinates both tax regimes and uses tools like bypass trusts or Canadian alter-ego trusts. Most U.S. citizen doctors in Canada need dual legal representation, a Canadian estates lawyer and a U.S. estates lawyer who talk to each other, or the estate pays twice.
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