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Four tax traps American physicians hit when relocating to Canada
Ontario recruited 570 American-trained physicians in 2025 alone, offering sign-on bonuses of $25,000 to $75,000 and streamlined provincial licensing. The pay gap between Canadian family doctors (median $330,000 CAD) and U.S. counterparts (roughly $305,000 to $310,000 USD median) makes the move financially attractive on the surface. The tax structure under that surface is what catches people.
U.S. citizenship means worldwide income reporting to the IRS regardless of where you practice. Moving to Canada doesn't stop that. You will file two returns every year, pay for two accountants every year, and navigate conflicting definitions of income between the Canada Revenue Agency and the IRS. Below are the four traps that cost physicians the most money or the most time.
The Medical Professional Corporation becomes a foreign tax nightmare
In Canada, incorporating as a physician is standard practice. A Medical Professional Corporation (MPC) allows you to defer tax by leaving income inside the corporation, which pays roughly 12% on the first $500,000 of active business income instead of the top personal rate of 53.53%. Most Ontario specialists incorporate within two years of entering practice.
For American citizens, that same structure triggers Passive Foreign Investment Company (PFIC) or Controlled Foreign Corporation (CFC) rules. If you leave money in the MPC and invest it, the IRS treats the investment income as passive. Passive income in a foreign corporation is taxed at your top marginal U.S. rate (currently 37% federal) plus a punitive interest charge on the deferred gain. The Canada-U.S. Tax Treaty does not shield you from this. The accounting cost alone to file IRS Form 5471 (CFC disclosure) and Form 8621 (PFIC calculation) runs $3,000 to $8,000 annually. That is before the actual tax bill.
The TFSA is treated as a regular investment account by the IRS
The Tax-Free Savings Account is the most popular retail savings vehicle in Canada. Contribution room in 2026 is $7,000 annually, cumulative lifetime limit now exceeding $109,000 for anyone who has been a Canadian resident since 2009. Investment growth is tax-free for Canadian purposes.
The IRS does not recognize the TFSA. It treats it as a regular foreign investment account. You owe U.S. tax annually on interest, dividends, and capital gains inside the account at your marginal rate, even though you cannot withdraw those gains without triggering Canadian penalties. You must also report the account on FinCEN Form 114 (FBAR) if your aggregate foreign accounts exceed $10,000 USD at any point in the year. Missing FBAR carries a penalty of $10,000 per violation, per year, even if unintentional. The Canada Pension Plan and Social Security have different rules.
Your RRSP grows tax-deferred for both countries, but CPP and Social Security fracture
The Registered Retirement Savings Plan is recognized under the Canada-U.S. Tax Treaty. Growth inside an RRSP is tax-deferred for both countries. You elect to defer U.S. taxation by filing IRS Form 8891. Most cross-border accountants handle this automatically.
The Canada Pension Plan (CPP) is where things fracture. If you are employed by a Canadian hospital or health authority, you will contribute to CPP at the employee rate of 5.95%. The U.S.-Canada Social Security Totalization Agreement allows you to avoid double contributions, but only if you file a certificate of coverage with the employer and the Social Security Administration. Without the certificate, you pay both. If you incorporate and pay yourself a salary from your MPC, the paperwork becomes your responsibility. Many physicians miss this for the first two to three years. The overpayment is not recoverable.
Exit tax applies when you leave or give up the Green Card
Most physicians assume the tax problem is entering Canada. It is also leaving. If you hold a Green Card when you move, you remain a U.S. tax resident until you formally surrender it. Surrendering the Green Card triggers an "expatriation" test. If your net worth exceeds $2 million, or if your average annual U.S. income tax liability over the prior five years exceeds $206,000 (2026 threshold), you are a "covered expatriate." That triggers mark-to-market taxation on all worldwide assets as if you sold them the day before expatriation. Unrealized gains are taxed at capital gains rates. There is no deferral.
Physicians who maintain U.S. citizenship avoid the exit tax but remain in the dual-filing system indefinitely.
Ontario recruited 570 American-trained physicians in 2025 alone, offering sign-on bonuses of $25,000 to $75,000 and streamlined provincial licensing. The pay gap between Canadian family doctors (median $330,000 CAD) and U.S. counterparts (roughly $305,000 to $310,000 USD median) makes the move financially attractive on the surface. The tax structure under that surface is what catches people.
U.S. citizenship means worldwide income reporting to the IRS regardless of where you practice. Moving to Canada doesn't stop that. You will file two returns every year, pay for two accountants every year, and navigate conflicting definitions of income between the Canada Revenue Agency and the IRS. Below are the four traps that cost physicians the most money or the most time.
The Medical Professional Corporation becomes a foreign tax nightmare
In Canada, incorporating as a physician is standard practice. A Medical Professional Corporation (MPC) allows you to defer tax by leaving income inside the corporation, which pays roughly 12% on the first $500,000 of active business income instead of the top personal rate of 53.53%. Most Ontario specialists incorporate within two years of entering practice.
For American citizens, that same structure triggers Passive Foreign Investment Company (PFIC) or Controlled Foreign Corporation (CFC) rules. If you leave money in the MPC and invest it, the IRS treats the investment income as passive. Passive income in a foreign corporation is taxed at your top marginal U.S. rate (currently 37% federal) plus a punitive interest charge on the deferred gain. The Canada-U.S. Tax Treaty does not shield you from this. The accounting cost alone to file IRS Form 5471 (CFC disclosure) and Form 8621 (PFIC calculation) runs $3,000 to $8,000 annually. That is before the actual tax bill.
The TFSA is treated as a regular investment account by the IRS
The Tax-Free Savings Account is the most popular retail savings vehicle in Canada. Contribution room in 2026 is $7,000 annually, cumulative lifetime limit now exceeding $109,000 for anyone who has been a Canadian resident since 2009. Investment growth is tax-free for Canadian purposes.
The IRS does not recognize the TFSA. It treats it as a regular foreign investment account. You owe U.S. tax annually on interest, dividends, and capital gains inside the account at your marginal rate, even though you cannot withdraw those gains without triggering Canadian penalties. You must also report the account on FinCEN Form 114 (FBAR) if your aggregate foreign accounts exceed $10,000 USD at any point in the year. Missing FBAR carries a penalty of $10,000 per violation, per year, even if unintentional. The Canada Pension Plan and Social Security have different rules.
Your RRSP grows tax-deferred for both countries, but CPP and Social Security fracture
The Registered Retirement Savings Plan is recognized under the Canada-U.S. Tax Treaty. Growth inside an RRSP is tax-deferred for both countries. You elect to defer U.S. taxation by filing IRS Form 8891. Most cross-border accountants handle this automatically.
The Canada Pension Plan (CPP) is where things fracture. If you are employed by a Canadian hospital or health authority, you will contribute to CPP at the employee rate of 5.95%. The U.S.-Canada Social Security Totalization Agreement allows you to avoid double contributions, but only if you file a certificate of coverage with the employer and the Social Security Administration. Without the certificate, you pay both. If you incorporate and pay yourself a salary from your MPC, the paperwork becomes your responsibility. Many physicians miss this for the first two to three years. The overpayment is not recoverable.
Exit tax applies when you leave or give up the Green Card
Most physicians assume the tax problem is entering Canada. It is also leaving. If you hold a Green Card when you move, you remain a U.S. tax resident until you formally surrender it. Surrendering the Green Card triggers an "expatriation" test. If your net worth exceeds $2 million, or if your average annual U.S. income tax liability over the prior five years exceeds $206,000 (2026 threshold), you are a "covered expatriate." That triggers mark-to-market taxation on all worldwide assets as if you sold them the day before expatriation. Unrealized gains are taxed at capital gains rates. There is no deferral.
Physicians who maintain U.S. citizenship avoid the exit tax but remain in the dual-filing system indefinitely.
Sources
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