[
17. Determination of tax payable in certain special cases.—
[(1) Where a person is not resident in the taxable territories and is not a company, the tax, including supertax, payable by him or on his behalf on his total income shall be an amount equal to—(
a) the income-tax which would be payable on his total income at the maximum rate,
plus(
b) either the super-tax which would be payable on his total income
[at the rate of
[nineteen per cent.]], or the super-tax which would be payable on his total income if it were the total income of a person resident in the taxable territories, whichever is greater:Provided that any such person may, on the first occasion on which he is assessable for any year subsequent to the year ending on the 31st day of March, 1951, and before the 30th day of June in that year, or where the first occasion on which he is so assessable falls during the year ending on the 31st day of March, 1952, before such
date as the Central Board of Revenue may, by notification in the Official Gazette, specify in this behalf, by notice in writing to the Income-tax Officer declare (such declaration being final and being applicable to all assessments thereafter) that the tax, including super-tax, payable by him or on his behalf on his total income shall be determined with reference to his total world income, and thereupon such tax shall be an amount bearing to the total amount of tax including super-tax which would have been payable on his total world income had it been his total income the same proportion as his total income bears to his total world income:]
[Provided further that where any such person satisfies the Income-tax Officer that he was prevented by sufficient cause from making such declaration on the first occasion on which he became assessable and his failure to make such declaration has not resulted in reducing his liability
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