Tools
183-day counter
Count your days in the United States the way the IRS does for the substantial presence test. Nothing you type leaves this page.
Last reviewed Oct 2026
Days counted for the test
0/ 183
All of the year you are checking, plus a third of the year before, plus a sixth of the year before that.
This counts days; it does not decide your residency. Visas, treaties and the first and last years of residency have their own rules.
Days that do not count
- Days you commuted to work in the U.S. from a home in Canada or Mexico, if you commute regularly.
- Days in the U.S. for less than 24 hours while traveling between two places outside the US.
- Days in the U.S. as a crew member of a foreign vessel.
- Days you could not leave the U.S. because of a medical condition that arose while you were here.
- Days you were an “exempt individual”: for example a student on an F, J, M or Q visa, or a teacher or trainee on a J or Q visa, who follows the visa’s rules; a foreign-government-related person on an A or G visa (not A-3 or G-5); a professional athlete at a charity event.
The exemption does not last for ever. A student is usually no longer exempt after being exempt for any part of more than five calendar years; a teacher or trainee, after being exempt for any part of two of the six years before. There are exceptions.
To leave out days as an exempt individual or for a medical condition, you must file Form 8843 on time. Without it, those days count.
Even if you meet the test
A tax treaty or the closer connection exception can still make you a nonresident. Green card holders are residents under a different test, whatever their days.
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