The pattern is beloved: a Canadian buys a Florida or Arizona property, uses it in winter, rents it out the rest of the year. The rent covers the costs; the sun covers the rationale.

The US side of that rent, though, starts from a default most owners have never heard of — and the difference between the default and the alternative is frequently the difference between owing meaningful tax and owing little or none.

The default: gross, not net

A non-resident’s US rental income is, by default, subject to US withholding on the gross rent — the full rent collected, before mortgage interest, property tax, condo fees, management, insurance, or anything else. No deductions. The property manager or tenant is nominally responsible for withholding it. On a property that’s barely cash-flow positive after expenses — which describes most snowbird rentals — a flat slice of gross rent is punishing relative to the actual profit, which may be near zero.

The alternative: elect into the net system

US law offers non-resident owners an election to treat the rental as a US business activity — file a US non-resident return, deduct the real expenses, and pay US tax on the net figure at regular rates. For a typical expense-heavy rental, the net figure is small and so is the tax. The election has formalities — it’s made on a return, there’s paperwork to give the withholding agent so gross withholding stops, and once the election is made, Form 1040-NR must generally be filed every year until the election is revoked — including loss years. Late filing can jeopardize the ability to claim deductions. Missing the return filing deadline by more than 16 months can permanently jeopardize rental deductions for that year unless relief applies. An owner who makes the election and then skips “pointless” loss-year filings is quietly rebuilding the problem.

Canada, meanwhile, taxes its resident’s worldwide income including this rent — with credit machinery for the US tax properly paid. “Properly” is load-bearing: tax that was withheld under the harsh default when the net election was available is the kind of thing credit systems and refund claims handle awkwardly.

The exit has its own withholding

Selling the property triggers a separate regime: US law requires the buyer to withhold a percentage of the gross sale price from a foreign seller — again gross, again regardless of actual gain, again with procedures (certificates, early filings) that can reduce it to something proportionate to the real tax. FIRPTA withholding is not the final tax. It is a gross-price withholding mechanism, and sellers can often apply for a withholding certificate before closing if the expected tax is lower than the default withholding. Sellers who learn this at closing lose the use of a large sum until a US filing recovers the excess. Sellers who learn it before listing plan the paperwork into the timeline. Day-count implications of all that winter use are their own separate issue (Snowbirds and the Substantial Presence Test: How Winters in Florida Add Up).

The theme

Everything on the US side of this property runs on elections and paperwork that convert brutal gross-basis defaults into reasonable net-basis outcomes. The system isn’t hostile to the Canadian owner — it’s hostile to the silent one. The rent is easy; the filings are the asset.

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