What Is the Substantial Presence Test?

The US Internal Revenue Service (IRS) considers you a US tax resident if you meet the Substantial Presence Test (SPT). This test is NOT simply "were you in the US for 183 days this year." It's a weighted 3-year calculation that catches many snowbirds off guard.

The formula: Current year days + (1/3 × prior year days) + (1/6 × year-before days) ≥ 183

Example: You spent 130 days in the US this year, 120 days last year, and 120 days two years ago. Your weighted total is: 130 + (120/3) + (120/6) = 130 + 40 + 20 = 190 days. You've met the Substantial Presence Test and may be subject to US taxes.

What Counts as a "Day in the US"?

The IRS counts any part of a day spent in the United States as a full day for SPT purposes. If you arrive in Florida on December 15 at 11 PM, that counts as a full US day. If you leave on April 14 at 6 AM, that also counts.

Key exceptions — these days do NOT count toward the Substantial Presence Test:

• Days you commute to work in the US from Canada (if you live in Canada near the border)
• Days in transit (connecting through a US airport to another country)
• Days as an exempt individual (certain visa types)
• Days due to a medical condition that arose while in the US

The Closer Connection Exception (Form 8840)

Even if you technically meet the Substantial Presence Test, you can avoid being classified as a US tax resident by filing IRS Form 8840, the Closer Connection Exception. To qualify, you must:

• Have been present in the US for fewer than 183 days in the current calendar year
• Have a tax home in a foreign country (Canada) for the year
• Have closer connections to Canada than to the US (family, home, bank accounts, driver's licence, etc.)

Form 8840 must be filed by June 15 of the following year. Most Canadian snowbirds who stay under 183 days per year and file Form 8840 successfully avoid US tax residency, even if the 3-year weighted test triggers.

What Happens If You Become a US Tax Resident?

Being classified as a US tax resident means you must file a US tax return (Form 1040) reporting worldwide income — including Canadian CPP, OAS, pension income, and investment gains. The Canada-US Tax Treaty prevents true double taxation in most cases, but the compliance burden is significant and professional help is expensive.

Prevention is far cheaper: stay under 182 days per calendar year, and file Form 8840 if your 3-year weighted total approaches 183.

Canadian Tax Residency While Snowbirding

Snowbirding in the US doesn't affect your Canadian tax residency in most cases. Canada taxes residents on worldwide income. As long as your primary home, family ties, and financial accounts remain in Canada, you remain a Canadian tax resident regardless of how long you spend in the US (up to the 183-day limit).

If you sell your Canadian home and establish permanent residence in the US, you become a Canadian non-resident — triggering a deemed disposition on most assets. This has major tax implications and requires professional planning.

OHIP and Provincial Health Coverage While Snowbirding

Ontario: OHIP requires you to be physically present in Ontario for at least 153 days in any 12-month period. You can be absent for up to 212 days. Snowbirds on a 5-month Florida winter are fine. A 7-month absence risks losing OHIP.

Other provinces have similar rules. Always check your province's residency requirements before extending your snowbird season.

FAQ

How many days can a Canadian spend in the US without paying US taxes?

Under 183 days per calendar year is the safe rule of thumb, but the Substantial Presence Test is a 3-year weighted formula. Even under 183 days, you may technically meet the test if you've been visiting consistently for years. File Form 8840 if your weighted total approaches 183.

Do I need to file a US tax return as a Canadian snowbird?

Not if you stay under 183 days and are solely retired with no US-source income. However, if you meet the Substantial Presence Test weighted formula, you should file Form 8840 with the IRS. If you earn rental income from a US property, you must file a US tax return regardless of days.

What is IRS Form 8840?

Form 8840 is the Closer Connection Exception Statement for Aliens. Filing it tells the IRS you have closer connections to Canada than the US, exempting you from US tax residency even if you technically meet the Substantial Presence Test weighted formula. Must be filed by June 15 of the following year.

See also: Snowbird Banking Canada USA | Foreign Bank Account Reporting | Canadians Retiring Abroad