Monday would not count as a day or presence towards the substantial presence test. See IRS Publication 519 page 4.
Regular commuters from Canada or Mexico.
Do not count the days on which you commute to work in the United States from your residence in Canada or Mexico if you regularly commute from Canada or Mexico.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
