Visiting the U.S.
Canadians are permitted to visit the United States for up to 6 months in a 12 month period. This is not based on a calendar year. If you stay for 6 months, you must depart the United State for 6 months before you are permitted to re-enter as a visitor. You cannot stay for 6 months, leave briefly and re-enter for another 6 months.
The B-1 status is for Canadian citizens coming to the U.S. to engage in business. Examples including traveling to the U.S. to consult with business associates; to attend a scientific, educational, professional or business convention; to settle an estate; or to negotiate a contract. You can certainly come down to the U.S. for your job with a Canadian employer. The best way to think about it is that you can come to the U.S. to conduct business, but you should not be employed by a U.S. company, or take a wage/salary while you are down here. If you do, then a B-1 status may not apply and you should consider an L visa, O visa, TN visa , or H-1B visa.
Athlete competing for prize money
Professional athletes coming to the U.S. to compete for prize money can enter the U.S. on a B-1 status. While the athletes are receiving compensation in the form of prizes, it is not really a salary, wage or employment that would require another type of visa. However, you may be required to pay U.S. taxes on any prize money you win.
Canadians coming to the U.S. for vacation or to visit family and friends for a short period of time would enter on a B-2 status. There are other unique situations in which you may enter on a B-2. For example, you may come to the U.S. on a B-2 status if you are seeking medical treatment. To do so, be sure to bring appropriate documentation, including a copy of your diagnosis, a letter from the U.S. medical establishment that has agreed to treat you, as well as documents indicating that you can support yourself financially while in the U.S.
While these visas may appear straightforward on its face, several things must be considered before coming to the United States under a B status, particularly if your intent is other than just a temporary visit. For example, if you are engaged to a U.S. citizen and are planning to come to get married, a B-2 status is not for you. Instead, you need to obtain a K visa.
If you are a prospective student traveling to the U.S. looking to apply for a school, you may do so on a B status. Once you enroll in a school, you can change your status to an F status. However, it is important that you tell the customs agent that you are entering the U.S. as a "prospective student" when applying for a B status. Otherwise, you may have difficulty changing your status to an F visa. Few people know about this requirement, and many prospective students often find themselves having trouble obtaining an F visa because they entered the U.S. on a B status without specifying their intent to become a student.
On balance, the B status is rather straightforward. However, its simplicity masks plenty of subtle complications that may seem innocuous at first blush. Most of these complications stem from the foreign national's intent when he/she first arrives in the country on a B status.
Banned from the U.S.
While Canadians generally enjoy the benefit of traveling freely to and from the United States, some Canadians end up being banned from the United States for one reason or another - overstaying on a visa being the most common. Depending on the length of the overstay, the ban may be anywhere from five years to ten years. Fortunately, there are ways for Canadian citizens to try to lift the ban, including an Application for Waiver of Grounds of Inadmissibility, Application for Permission to Re-Apply for Admission into the United States after Removal/Deportation, and an Application for Advance Permission to Enter as a Non-Immigrant.