Independent Personal Services
(1) Income derived by an individual who is a resident of a Contracting State in respect of professional services or other activities of an independent character shall be taxable only in that State unless such services are performed in the other Contracting State and:
- (a) the individual is present in the other State for a period or periods exceeding in the aggregate 183 days in any 12 month period commencing or ending in the year of income concerned; or
- (b) a fixed base is regularly available to the individual in the other State for the purpose of performing the individual's activities.
If the provisions of sub-paragraphs (a) or (b) are satisfied, the income may be taxed in that other State but only so much of it as is attributable to activities performed during such period or periods or from that fixed base.
(2) The term "professional services" includes especially independent scientific, literary, artistic, educational or teaching activities as well as the independent activities of physicians, lawyers, engineers, architects, dentists and accountants.