Your TFSA becomes a tax trap the moment you cross the border
A 32-year-old software engineer from Toronto accepts a job in Seattle. His TFSA holds $87,000 in Canadian equity ETFs, compounding tax-free since 2016. The account has never caused him trouble. Three months after crossing the border, he discovers the IRS considers it a foreign trust requiring annual disclosure on Forms 3520 and 3520-A, with penalties starting at $10,000 for missed filings.
The TFSA isn't recognized under U.S. tax law. What Canada treats as tax-exempt growth, the IRS treats as taxable income. Dividends, interest, and realized gains inside the account are all reportable. Worse, the "foreign trust" classification triggers compliance requirements most retail investors have never heard of. The engineer's tax-free savings vehicle just became an administrative burden with punitive downside.
RRSPs get treaty protection, TFSAs don't
The Canada-U.S. Tax Treaty explicitly protects RRSPs and RRIFs. A Canadian who moves south can leave an RRSP intact, and the U.S. federal government will defer tax on the internal earnings until withdrawal. Some states, California and New Jersey among them, tax those earnings annually anyway, but the federal structure holds.
The TFSA has no equivalent protection. The treaty was written before TFSAs existed, and no subsequent update has added them. Once you're a U.S. tax resident, the account loses its defining feature. The cost of keeping it often exceeds the benefit. For accounts under $50,000, the reporting complexity alone pushes many people to close them before relocating.
Canadian brokerages will close your account
Even if you're willing to manage the U.S. tax reporting, your Canadian brokerage probably isn't willing to keep you as a client. Most online platforms, Questrade, Wealthsimple, TD Direct Investing, restrict service to Canadian residents. U.S. securities regulations require brokerages serving American clients to register with the SEC, a threshold most Canadian firms won't cross for a small segment of expatriate accounts.
The standard procedure: notify the brokerage of your move, liquidate or transfer holdings within 60 to 90 days, and close the account. If you don't notify them, they'll discover the change when you update your address or fail a routine compliance check, then freeze the account until you either return to Canada or close it. Transfers to U.S. brokerages are possible but require finding a firm that handles cross-border moves, and many will only accept taxable accounts, not registered ones.
Mutual funds become PFIC landmines
If your TFSA holds Canadian mutual funds or ETFs, you're stepping into Passive Foreign Investment Company rules. The IRS taxes PFICs harshly: gains are taxed at ordinary income rates, an interest charge is added to simulate deferral, and annual reporting on Form 8621 is required per holding. A diversified portfolio of six funds means six separate forms.
PFIC treatment applies regardless of account type. Moving the same funds into a taxable account doesn't solve the problem. The only clean path is selling Canadian-domiciled funds before you establish U.S. residency and replacing them with U.S.-listed equivalents. Timing matters: capital gains realized while still a Canadian resident are taxed in Canada at preferential rates. The same gains realized after you've become a U.S. person trigger both Canadian departure tax and U.S. recognition, often with limited foreign tax credits to offset the overlap.
The structural issue is that the two tax systems don't align on timing, classification, or what counts as income. The TFSA worked in Canada because Ottawa said it did. The moment you move, you're playing by a rulebook that was written without it.
