How Long Can a Canadian Stay in the US?

The four counts at a glance

1. How long a visit can be

Canadian citizens don't need a visa to visit the United States as tourists. The Government of Canada's travel advice puts it simply: Canadian visitors can usually stay in the United States for 6 months without a visa. The final decision belongs to the U.S. Customs and Border Protection officer when you enter — they can admit you for less, and they look at how much time you've already spent in the country.

If you fly in, CBP may record your admission electronically as an I-94. Look it up on the CBP website: if there is a record, the date on it is the date you must leave by. Many land crossings don't create an I-94, which matters for registration (see below). If you need to stay longer than you were admitted for, the request goes to USCIS before your authorized stay ends — not after.

What about "182 days"? You'll often read that snowbirds can stay "182 days a year". That number isn't a written CBP rule: it comes from six months and from the tax test below, which treats 183 days as the line. It is a sensible ceiling to plan around, but the legal limits are the admission an officer gives you and the tax formula — and each is counted differently.

2. Registration if you stay 30 days or longer

U.S. law requires foreign nationals aged 14 or older who remain in the country for 30 days or longer to be registered. Since 2025 this is enforced, and on 29 June 2026 the Department of Homeland Security made the rule final. USCIS names Canadian visitors who entered at land ports of entry and weren't issued evidence of registration — that is, no I-94 — as people who may still need to register.

• Already registered: anyone issued an I-94, paper or electronic (check the CBP website — don't assume a flight created one), and anyone last admitted through a Trusted Traveler program such as NEXUS, SENTRI, FAST or Global Entry.
• How to register: create a USCIS online account and file Form G-325R there. Paper and in-person filing aren't accepted.
• Penalties: willfully failing to register is a misdemeanor punishable by a fine of up to $5,000, up to six months in prison, or both. Adults must also carry proof of registration.

The requirement applies per stay: if a winter in Florida will last 30 days or more and you crossed by car without an I-94, check your status before day 30.

3. The tax test: 183 days by formula

The IRS treats you as a U.S. resident for tax purposes in a year if you meet the substantial presence test: at least 31 days in the U.S. that year, and 183 days when you add all the days this year, one third of last year's days and one sixth of the days the year before. Any part of a day in the U.S. counts as a day.

This is the trap for snowbirds who come back every winter. If you spend the same number of days in the U.S. every year, the formula reaches 183 at about 122 days a year (122 + 40.7 + 20.3 = 183). For example:

The closer connection exception. Meeting the test doesn't have to make you a U.S. tax resident. If you were in the U.S. fewer than 183 days in the year itself, kept your tax home in Canada for the whole year and had a closer connection to Canada than to the U.S., you can be treated as a nonresident by filing Form 8840. It's due by the due date of a U.S. nonresident return — usually 15 June of the following year if you have no U.S. wages — and filing late can cost you the exception. It isn't available to anyone who took steps toward a green card that year.

Use the calculator above with your days in the U.S. for this year and the two before to see where you stand and how many more days you can spend this year.

4. Your province's health coverage

Provincial health plans have their own presence rules, and they are often stricter than the U.S. ones. Ontario says that if you've been outside Ontario for more than 212 days in any 12-month period, you may have to reapply for OHIP, and residents must be physically in Ontario for 153 days in any 12-month period. British Columbia asks residents who will be away for six months or more in a calendar year to contact Health Insurance BC. Other provinces set different limits — check yours, and buy travel medical insurance for the U.S.: provincial plans cover only a fraction of U.S. hospital costs.

A sample snowbird winter

Say you drive to Florida on 1 November and come home on 15 April, every winter. That's 166 days per winter, and every calendar year gets about the same: 105 days from January to mid-April plus 61 days in November and December.

• Visit length: 166 days is within six months — if the officer admits you for that long.
• Registration: day 30 of the stay is 30 November. If you crossed by car without an I-94 and you don't use NEXUS, register before then.
• Tax test: 166 + 55.3 + 27.7 = 249 — you meet the substantial presence test every year, so you file Form 8840 each year by mid-June to stay a nonresident (you are under 183 days in each year itself).
• Ontario: 166 days away is under 212 — but add your summer trips: the limit counts every day outside Ontario in any 12 months.

How days are counted

• For the tax test, any part of a day in the U.S. counts — the day you drive south and the day you drive home both count.
• For each visit, the officer's admission period applies; a short trip out of the country doesn't automatically give you a fresh six months.
• For your province, the 12-month window rolls: count backwards from today, not from 1 January (Ontario's rule is "any 12 month period").

Questions

Can a Canadian stay in the US for 6 months?

Usually yes, as a visitor without a visa — but the border officer decides on each entry, and six months every year can also bring the tax test and registration into play.

Does a trip to Mexico reset the six months?

There's no official rule that a short trip resets your time. Officers look at how long you've been in the U.S. overall, so keep a record of every entry and exit.

Do I need to register if I flew to the US?

Only if CBP issued you an I-94. Look it up on the CBP website: if there is a record, you're already registered. If you can't find one, treat yourself as unregistered and register before day 30. NEXUS users last admitted through the program are registered too.

How many days can I spend in the US before I owe US tax?

The substantial presence test reaches 183 at about 122 days a year if you visit every year. Above that you meet the test and need Form 8840 (or a treaty position) to stay a nonresident.

What happens if I stay too long?

Staying past your authorized date is an overstay; long overstays can lead to bans on returning — 3 years after more than 180 days, 10 years after a year or more. Ask an immigration lawyer if your dates are close.

Is this legal or tax advice?

No. Daysafe counts days. For your situation, talk to a cross-border tax adviser or immigration lawyer.

Sources

Government of Canada, Travel advice: United States; USCIS, Alien Registration Requirement (updated 4 September 2026); IRS, Substantial Presence Test and Closer Connection Exception; Government of Ontario, Apply for OHIP; Government of British Columbia, Health Insurance BC. Checked on 13 October 2026. Daysafe is a day counter, not legal or tax advice. Made by Denis Chudinov.