Code of Federal Regulations Title 26. Internal Revenue § 26.521.112 Compensation for labor or personal services

(a) Where such individual is temporarily present in the United States for a period or periods not exceeding a total of 90 days during the taxable year, compensation received for labor or personal services within the United States during such year is exempt from Federal income tax provided such compensation does not exceed $3,000 in the aggregate.

(b) Where such individual is temporarily present in the United States for a period or periods not exceeding a total of 180 days during the taxable year, compensation for labor or personal services within the United States during such year is exempt from Federal income tax provided such compensation is received for services performed as a worker or employee of, or under contract with, a resident or corporation of Denmark (even though such resident or corporation is engaged in trade or business in the United States) which resident or corporation actually bears the expense of such compensation and is not reimbursed therefor by another person.

As to the source of compensation for labor or personal services, see section 119(a)(3) of the Internal Revenue Code.