Independent personal services
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....spect of professional services or other activities of an independent character shall be taxable only in that Contracting State except in one of the following circumstances, when such income may also b....
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....n the aggregate 183 days in the taxable year concerned; in that case, only so much of the income as is derived from his activities performed in that other Contracting State may be taxed in that other ....
TaxTMI