Bottom line
Short hold under three years with strong home equity, choose a HELOC. Five-plus year hold and you want fixed-rate predictability without encumbering your domestic home, choose the cross-border mortgage.
Most buyers land cleanly in one of those two profiles. The harder calls sit in the three-to-five-year window, where the answer turns on rate expectations and your tolerance for variable-rate exposure.
The cost difference, in ranges
US HELOC rates currently price near prime plus 1 to 2 percent, putting most lines in the 9 to 10.5 percent range; the prime rate sits at 7.50 percent as of April 2026.[Federal Reserve, H.15 Selected Interest Rates, 2026-04] Canadian HELOC rates run prime plus about 0.5 percent, with prime at 5.45 percent putting most lines near 6 percent.[Bank of Canada, Selected Historical Interest Rates, 2026-04] Cross-border mortgages on Mexican, Costa Rican, or Portuguese property typically price between 8 and 13 percent depending on country, lender, and currency of the note.
On a $260,000 loan held five years, a US HELOC at 9.5 percent costs roughly $123,000 in interest if rates hold flat. A cross-border mortgage at 9 percent fixed runs about $116,000. The HELOC looks close on paper. The catch is the variable-rate assumption: a 100-basis-point move adds roughly $13,000 over the same window.
When the spread narrows, short or inverted yield curves and periods where prime compresses against term rates, the HELOC can pull even or slightly ahead. Those windows are real but historically rare.
What the HELOC costs that the rate sheet doesn’t show
Two hidden costs deserve flagging. First, rate variability: a HELOC drawn this quarter can re-rate higher next quarter as prime moves. Second, primary-residence encumbrance: if your US or Canadian primary residence is your largest asset, putting a six-figure lien against it shifts your liquidity profile and your downside if the foreign property dips. A cross-border mortgage doesn’t touch your primary residence.
A third, less-discussed cost: HELOCs carry call features. Most US HELOC agreements let the lender freeze, reduce, or call the line under specific conditions, including declining home values, changed financial circumstances, or broad market events.[CFPB, What You Should Know About Home Equity Lines of Credit, 2026-04] That right is rarely exercised, but it does get exercised, and a called HELOC during a foreign-property hold is a problem with no good solutions.
When the cross-border mortgage is the wrong call
Cross-border mortgages have origination friction. Underwriting runs weeks, not days. Foreign-buyer down payment minimums are 30 to 35 percent. Closing costs in the destination country apply on top of the loan. If you’re moving fast on a deal that won’t wait, the cross-border mortgage timeline can lose you the property. A HELOC drawn against an already-approved domestic line can close in days.
Cross-border mortgages also concentrate currency exposure. A USD-denominated loan on a peso-priced property creates one structural FX position; a peso-denominated loan creates another. The right instrument depends on whether you have natural peso income, whether you plan to relocate, and how you want to handle currency over the hold period.
Common questions
Can I do both, HELOC for closing speed, then refinance into a cross-border mortgage?
Yes, and a meaningful share of cross-border buyers take that path. The HELOC closes the deal; the cross-border mortgage refinances the position six to twelve months later once underwriting completes. The trade-off is double closing costs and dual-document complexity.
Does a HELOC affect my ability to qualify for the cross-border mortgage later?
It affects your debt-to-income calculation. The HELOC balance and minimum payment both get factored in. If you’re planning to refinance from HELOC into cross-border financing, model the qualifying math up front rather than discovering it at refinance underwriting.
Are HELOC interest payments tax-deductible if used for a foreign property?
Generally no for US tax purposes. Interest on a HELOC is only deductible when proceeds are used to “buy, build, or substantially improve” the home securing the loan, per current IRS rules.[IRS, Publication 936, Home Mortgage Interest Deduction, 2026-04] Foreign-property purchases don’t qualify. Consult a cross-border tax practitioner; this is an area where rules change and personal circumstances matter.
What about Canadians using a HELOC on their Canadian home?
Canadian HELOC interest used for foreign-property investment may be deductible against rental income generated by the foreign property, under the broad CRA principle that interest is deductible when borrowed money is used to earn income.[CRA, Income Tax Folio S3-F6-C1, Interest Deductibility, 2026-04] Owner-occupied foreign properties don’t generate qualifying income. As with US filers, talk to a cross-border tax professional before relying on this.
Run your numbers
Plug your loan amount, hold period, and rate assumptions into the HELOC vs mortgage calculator to see how the two structures compare for your specific case. For the broader financing picture, how to finance property abroad walks through the full menu, and Canadian mortgage structure abroad covers the CRA-side specifics.
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