Independent personal services
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....ived by a resident of a Contracting State in respect of professional services or other independent activities of a similar character shall be taxable only in that State except in the following circums....
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....od or periods amounting to or exceeding in the aggregate 91 days in any twelve-month period; in that case, only so much of the income as is derived from his activities performed in that other State ma....
TaxTMI