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I would be concerned about the tax situation.

This reminds of an incident I had a few years ago, which might relate to what one might say to authorities in this situation. I was driving from Seattle to Vancouver where I was going to give a talk at an academic conference. When I went through Canadian customs, they asked my plans and when I told them they agent got very "interested". He asked what I was getting paid and I replied, nothing.  He did not buy that, so he directed me to the building up ahead with the yellow light, where I went in and got the third degree.  Evidently Canadian customs is very  sensitive to Americans crossing the border to work in Canada, regardless the sum of money involved.