Independent Personal Services
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....ing State from the performance 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 incom....
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.... to or exceeding in the aggregate 183 days in any period of 12-months; 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 oth....
TaxTMI