If you own US stocks or ETFs, currency decisions quietly affect your returns. Here is how to think about it without overcomplicating your portfolio.
Most Canadian investors eventually run into the same question: should I hold US dollars separately, or just let my broker convert everything back to Canadian dollars? The answer depends less on ideology and more on how often you trade US-listed assets, how large your US holdings are, and how much friction you're willing to tolerate for a bit of savings.
When you buy a US-listed stock or ETF inside a Canadian brokerage account, you generally need US dollars to complete the trade. If you only hold Canadian dollars, your broker converts them for you automatically at the time of the trade. That conversion carries a cost, often built into the exchange rate rather than shown as a separate line-item fee. Do this often enough, or with large enough amounts, and the cumulative cost becomes noticeable over years.
Many Canadian brokerages let you hold a USD cash balance alongside your CAD balance, sometimes through a formal "USD-denominated" registered account option, sometimes just as a wallet within the same account. The point is simple: once you hold actual US dollars, buying and selling US-listed securities no longer triggers an automatic currency conversion. You still had to acquire those US dollars at some point, but you're not repeatedly converting back and forth every time you rebalance or reinvest a US dividend.
This matters most for investors who trade US-listed holdings regularly, receive recurring US dividend income they plan to reinvest in US assets, or hold a meaningfully large US-dollar position. For someone who buys a few shares of a US ETF once or twice a year, the savings from avoiding repeated conversions are modest.
Currency conversion costs at Canadian brokers typically show up as a spread against the mid-market exchange rate, rather than an explicit commission. That spread varies by institution and isn't always disclosed prominently, which is exactly why it's worth checking your own statements. A one-time conversion for a modest sum barely matters. Someone who converts back and forth frequently, or converts large sums, is the one who should pay closest attention, because the cost compounds with frequency, not with any single transaction size alone.
Some DIY investors use a technique known as Norbert's Gambit to convert currency more cheaply than a standard broker conversion. In broad strokes, it involves buying a security that trades in both CAD and USD versions on different exchanges, then journaling the shares between the two listings and selling in the target currency. Done correctly, this can reduce the effective spread paid on a large conversion. It requires extra steps, a brokerage that supports journaling shares between listings, and enough transaction size to make the effort worthwhile. It is not something most casual investors need to learn, but it's useful to know it exists if you're moving a large amount between currencies.
A few situations make a USD-side setup genuinely useful. If a meaningful portion of your portfolio is US-listed stocks or ETFs, holding the underlying cash and dividends in USD avoids constant round-trip conversions. If you receive regular US dividend payments and plan to reinvest them into US holdings, keeping that cash in USD until you reinvest removes an unnecessary conversion step. If you're planning a large one-time purchase of US-listed assets, thinking through the conversion cost in advance, and possibly using a technique like Norbert's Gambit, can be worth the extra effort.
On the other hand, if your US exposure is small, occasional, or achieved indirectly through a Canadian-dollar-hedged ETF, the currency question mostly disappears. Hedged ETFs and Canadian-listed funds that hold US assets handle currency exposure internally, so there's often nothing extra for you to manage.
For most long-term, buy-and-hold investors, the simplest approach is usually fine: let the broker convert currency when needed, and focus energy on asset allocation and consistent contributions rather than currency optimization. Currency management is a legitimate lever for investors with large or frequent US-dollar activity, but for a smaller portfolio, the time spent researching journaling techniques may not be worth more than the modest savings involved. A tool like WealthWise can help you see your total portfolio value in Canadian dollars alongside your individual holdings, so you can judge for yourself whether currency friction is actually costing you anything meaningful.
As with most portfolio decisions, the right answer scales with the size and complexity of what you're managing. Start simple, and only add currency-specific tactics once your US-dollar activity is large enough to justify the extra steps.
Not necessarily. Most brokers will convert your Canadian dollars automatically at the time of purchase. A USD-side account simply lets you avoid repeated conversions if you trade US-listed assets often.
Generally no. The technique involves extra steps and only meaningfully reduces conversion cost when applied to larger sums, where the savings outweigh the added effort.
Largely, yes. Currency-hedged ETFs manage the CAD/USD exposure internally, so you don't need to think about holding USD separately for that portion of your portfolio.
Look at how often you convert currency and how large those conversions are. Frequent or large conversions are where the cumulative cost is worth examining; occasional small ones rarely matter much.
Start with WealthWise for free →
Wealth