Match the Mortgage Currency to the Income That Pays It

The direct answer: debt should generally live in the currency of the income that services it. A Florida property earning US dollars sits naturally on a US-dollar mortgage. Financing it instead by fully leveraging a Canadian home in Canadian dollars swaps a visible one-to-two point rate difference for an invisible exposure that has historically moved several times that size. The rate gap is real; the currency gap is bigger; only one of them is printed on the offer.

The trade people think they are making

Canadian rates often quote below US rates, so the refinance-at-home plan looks like arbitrage: borrow cheap CAD against the house, pay cash in Florida, skip the foreign national process entirely. Every element of that sentence is true, and the plan still carries the largest single risk in the file, because the loan and the asset now live in different currencies. You have not avoided financing complexity; you have moved it somewhere the monthly statement does not show it.

What the mismatch actually does

Hold a USD asset against CAD debt and your leverage changes every time the exchange rate does, without a single transaction. If the Canadian dollar strengthens, the Florida property is worth fewer of the dollars you owe: equity compresses while the payment stays the same, and a sale can crystallize a currency loss that erases years of rental income. If the loonie weakens, the same mechanics gift you a windfall. Either way you are running an FX position the size of a house, and the Bank of Canada's own history shows the loonie ranging across more than thirty US cents over the past two decades. Against that, a rate advantage measured in single points is not the main event.

The matched structure

The matched version keeps USD debt on the USD asset: a foreign national or DSCR mortgage in US dollars, serviced by US-dollar rent, with Canadian equity supplying the down payment only. Rent and payment then move together; the exchange rate decides how conversions feel, not whether the structure survives. The trade-off is honest and visible: a somewhat higher sticker rate and a US closing process, in exchange for removing the balance-sheet FX bet. Files with strong reasons sometimes still choose CAD leverage, for timing, for qualification, for a short planned hold. The point is not that one answer is always right; the point is that the currency exposure should be a decision in the file, not a residue of chasing the smaller printed number.

The question to bring to a review

State the plan in one sentence with the currencies attached: who pays the mortgage, in what currency, from what income, and what happens to each piece if the exchange rate moves ten cents either way. If the sentence cannot be finished comfortably, the structure needs work before the purchase, not after. That sentence is the whole review, and it costs nothing to ask.

Related: Why the US-Canada rate gap exists · Cash flow over rate · US mortgages with no US credit