4. Adjustment of tax paid by deduction at source.- Where for any year an assessment of the profits of life insurance business is made in accordance with the annual average of a surplus disclosed by a valuation for an inter-valuation period exceeding twelve months, then, in computing the income-tax payable for that year, credit shall not be given in accordance with section 199 for the income-tax paid in the previous year, but credit shall be given for the annual average of the income-tax paid by deduction at source from interest on securities or otherwise during such period. | 