19. Every registered person shall notify the Commissioner-General in writing of-
(a) any change, in the name, address and place, at which any taxable activity is carried on or carried out by such person ; |
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(b) any change in the nature of the taxable activity carried on or carried out by him ; |
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(c) any change in the person authorized to sign returns and other documents ; and |
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(d) any change in ownership of the taxable activity, |
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