Hiring international contractors can be useful but comes with challenges like IRS requirements or foreign labor laws. To register a foreign nonprofit in the State of Illinois, you must file an Application for Authority to Conduct Affairs in Illinois.To find out if you qualify, write a letter of request to the Illinois Department of Revenue, Sales. IDES supports the temporary Alien Employment Certification Program under an annual grant from the US Department of Labor. No consequence in paying international contractors, it's on them to properly report their income to their government. All US employers must properly complete Form I9 for every individual they hire for employment in the United States. This includes citizens and noncitizens. How does a foreign contractor complete the W8 BEN? Learn the rules for qualifying your foreign (outofstate) corporation or LLC in Illinois.