Independent personal services
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....respect of professional services or other activities of an independent character shall be taxable only in that State except in the following circumstances when such income may also be taxed in the oth....
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....ate 183 days in any 12 month period commencing or ending in the fiscal year concerned; in that case, only so much of the income as is derived from his activities performed in that other State may be t....
TaxTMI