Canadian Snowbirds: How Part-Year US Residency Affects Your Mortgage Qualification

Canada's Income Tax Act deems an individual resident in Canada for a full tax year if they sojourn in Canada for 183 days or more in that year. The inverse — spending 183 or more days in the US — does not automatically make you a US tax resident, but it activates the US substantial presence test (SPT). The SPT uses a weighted three-year formula: all days in the current year, plus one-third of days in the prior year, plus one-sixth of days two years prior. A snowbird spending 160 days annually in the US accumulates approximately 160 + 53 + 27 = 240 weighted days — above the 183-day SPT threshold. Without a closer-connection exception (IRS Form 8840) filed annually, the IRS can assert US tax residency. Canadian lenders underwriting a refinance or renewal will ask for your most recent T1 and NOA; if those show Canadian residency and Canadian-source income, the file proceeds as domestic. The moment a lender sees a US address, a US tax filing, or a W-8BEN on file, the file may be rerouted to non-resident underwriting with materially different LTV caps and rate premiums.

If a Canadian lender classifies you as a non-resident, the underwriting framework shifts substantially. LTV cap: Most prime lenders cap non-resident mortgages at 65% LTV (some at 60%), versus 80% for uninsured domestic borrowers. CMHC default insurance is not available to non-residents, so the insured route is closed entirely. Rate premium: Non-resident files typically carry a 25–75 bps premium over equivalent domestic pricing, reflecting the lender's reduced recourse and cross-border enforcement complexity. Income documentation: Foreign-source income (US Social Security, US pension, USD rental income) must be converted to CAD at the Bank of Canada's average annual rate and is often haircut 15–25% by lenders who apply a foreign-income discount. Withholding: If the Canadian property generates rental income while you're in Florida, CRA requires 25% NRA withholding on gross rents under Part XIII of the Income Tax Act unless a Section 216 election is filed to net the income — a step many snowbirds miss.

The safest mortgage posture for a snowbird is to document Canadian residency proactively and consistently. Key practices: Keep your Canadian address as your primary address on all financial accounts, CRA correspondence, provincial health card, and driver's licence. File IRS Form 8840 (Closer Connection Exception) every year you exceed the SPT weighted threshold — this is the single most important US filing for snowbirds and costs nothing to file. Track days precisely using a travel log or passport stamps; CRA and CBSA can request entry/exit records. Do not establish a US domicile — avoid registering a vehicle in Florida, obtaining a Florida driver's licence, or registering to vote in the US, as these are domicile indicators that undercut the closer-connection argument. Lenders conducting enhanced due diligence on a renewal or refinance may request a statutory declaration of residency; having your documentation in order avoids delays.

A US mortgage on a Florida or Arizona property is a foreign liability that Canadian lenders must include in the Total Debt Service (TDS) ratio calculation. The monthly USD payment is converted to CAD at the prevailing spot rate and added to the TDS numerator alongside Canadian obligations. For a couple carrying a USD $1,800/month Florida mortgage, at a 1.38 exchange rate that is approximately $2,484 CAD/month — a material TDS drag. Some lenders will offset this if the US property generates documented rental income (e.g., seasonal rental during Canadian summer months), but the rental income offset is typically capped at 50–80% of gross rents and requires a US lease agreement or prior-year Schedule E. Lenders vary significantly on how they treat foreign rental offsets; broker access to multiple lenders is structurally advantageous here.

At a straight renewal (same lender, same property, no new funds), the December 2024 OSFI straight-switch guidance means the lender is not required to re-stress-test the borrower at the new qualifying rate — but they retain discretion to re-underwrite if material changes in borrower circumstances are identified, including a change in residency status. A refinance (new funds, new LTV, or lender switch) triggers full B-20 underwriting: stress test at the greater of the contract rate plus 200 bps or 5.25%, full income and liability verification, and a fresh property appraisal. For snowbirds, the refinance scenario is higher-risk because it opens the file to residency scrutiny. Timing a refinance to coincide with a period of clear Canadian residency documentation — and before any US address appears on financial records — is a practical risk-management step.

For snowbirds aged 55+ who want to access Canadian home equity without the income-qualification friction of a conventional refinance, a reverse mortgage (CHIP from HomeEquity Bank or Equitable Bank's PATH product) is structurally compatible with snowbird residency patterns. Qualification is based primarily on age and property value rather than income or TDS ratios. The property must be the borrower's principal Canadian residence — which a snowbird who spends 205+ days in Canada satisfies. No payments are required, eliminating the TDS impact of a new mortgage obligation. The trade-off is a rate premium of approximately 150–200 bps over conventional 5-year fixed rates (roughly 6.75–7.25% in the current environment) and compounding interest that erodes equity over time. For snowbirds with limited pension income but substantial home equity, this is often the most accessible equity-release mechanism.