Independent personal services
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....rformance of professional services or other independent activities of a similar character shall be taxable only in that State except in the following circumstances when such income may also be taxed i....
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....eding in the aggregate 183 days in the relevant "taxable year"; in that case, only so much of the income as is derived from his activities performed in that other State may be taxed in that other Stat....
TaxTMI