I am an American citizen who will be consulting for a Danish entity from July1st-July 31st for a fixed project with a fixed project value. As part of this work, I will attend a workshop in Brussels from July 1st-July 3rd. After that, I will work on the project while doing personal traveling in the EU (specifically, in Portugal, Spain, and France) in hotels that I will arrange myself. I will not be spending any time in Denmark. I will remain in the EU after the work is completed, from August 1st - September 2nd, so the length of my total stay in the EU should be covered by a Schengen tourist visa (which I understand to be 90 days in a 180 day period).
How will taxes be dealt with, i.e. will I need to pay taxes to Denmark on the lump sum I receive for the consulting services? Do you anticipate any issues with just traveling on a tourist visa? Are there resources you can recommend for me to educate myself?