Are you a Canadian who spends your winters in the southern United States, or occasionally conducts work in the US? Many Canadians do not know that they need a work visa to legally conduct business during their stay in the United States. Even more worrisome is that they don't know that they may be required to file taxes with the IRS. This law also applies to those telecommuting from the US for Canadian businesses. The consequences of declining to pay taxes or not obtaining a work visa can be severe. One could end up being declared an illegal immigrant and being deported!