Independent personal services
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....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 unless : (a) he has a fixed bas....
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...."previous year" or "year of income", as the case may be; in that case, only so much of the income may be taxed in that other State as is attributable to the activities performed in that other State. ....
TaxTMI