U.S. or Canadian ETF: When the Currency Conversion Actually Pays Off

A 42-year-old dentist in Calgary has $380,000 in her RRSP, pays 1.4% to convert CAD to USD at her bank, and wants to know if buying VTI instead of VUN.TO is worth the hassle. The math depends almost entirely on where she holds it.

The RRSP Exception

VTI charges 0.03% annually. VUN.TO, which just buys VTI and wraps it in a Canadian ticker, charges 0.16%. The MER gap is 0.13%, or $494 per year on $380,000. Over 20 years at 7% real growth, that gap compounds to roughly $23,000. Meaningful.

But the MER tells half the story. U.S. companies pay dividends to VTI. The IRS withholds 15% before those dividends reach the investor. The Canada-U.S. tax treaty waives that withholding for U.S.-listed ETFs held specifically in an RRSP or RRIF. Canadian-listed ETFs holding U.S. stocks cannot recover it. On a 1.5% dividend yield, the withholding tax costs 0.225% annually, nearly double the MER savings. VTI in an RRSP avoids that. VUN.TO in an RRSP does not.

So: $494 MER savings, plus roughly $855 in recovered withholding tax, equals $1,349 per year. Subtract the 1.4% currency conversion cost of $5,320 upfront. The breakeven is four years. After that, the U.S.-listed fund pulls ahead by $1,349 annually, compounding. For a long-term RRSP holder, VTI wins by a lot.

Change one variable: she converts at 1.4% twice, once to buy, once when she eventually sells. Now the FX cost is $10,640, and breakeven stretches past seven years. Still worth it at her time horizon, but the margin tightens.

Change another: she uses Norbert's Gambit, buying a stock listed on both exchanges and journaling it over, to convert at roughly 0.1% instead of 1.4%. The FX cost drops to $380. Breakeven happens in three months. That's the institutional move, and it's why large portfolios almost always go U.S.-listed in RRSPs.

The TFSA Failure Mode

Move the same $380,000 into a TFSA. The withholding tax doesn't disappear, it's still 15%, or $855 annually. But the foreign tax credit that offsets it in taxable accounts doesn't apply in a TFSA. You lose it entirely. The MER savings remain $494, but now the 15% withholding drag costs more than you save. Total net benefit if she converts at 1.4%: negative. VTI in a TFSA is paying currency conversion fees for the privilege of a higher tax drag.

The rule isn't subtle: U.S.-listed equity ETFs belong in RRSPs and RRIFs where the treaty applies, not TFSAs or taxable accounts unless you're solving for something other than tax efficiency.

Where the Threshold Sits

Portfolio size matters because the absolute dollar value of savings has to justify the administrative weight. On a $50,000 RRSP, the MER and withholding savings might total $180 annually. After a $700 FX conversion at 1.4%, you're underwater for years. Most advisors set the threshold around $100,000 for RRSPs specifically, assuming the investor uses Norbert's Gambit or has access to low-cost USD conversion.

Below that, the Canadian-listed fund is often the better trade, not because the math is better but because the effort-to-benefit ratio doesn't clear. Above $250,000, the U.S.-listed version in an RRSP is nearly always correct if the investor is willing to handle two-currency reporting and isn't planning to withdraw in the next three years.

For taxable accounts, the calculus flips again: the 15% withholding can be claimed as a foreign tax credit, so the drag isn't permanent, but the added T1135 reporting requirement for foreign property over $100,000 and potential U.S. estate tax exposure at higher balances often swings the decision back to Canadian-listed funds for portfolios under $500,000.

The dentist's question wasn't really about VTI versus VUN.TO. It was about whether her account type, time horizon, and FX access justified the structural difference. In her RRSP, with Norbert's Gambit, the answer is yes by a wide margin.