(2)(a)Without prejudice to the provisions of sub-section (1), the person responsible for paying any income in the nature of a non-monetary perquisite chargeable to tax under section 17(1), may pay, at his option, tax on the whole or part of such income without making any deduction therefrom, at the time when such tax was deductible under sub-section (1);(b)the tax under clause (a) shall be determined at the average rate as per sub-section (1), on the income chargeable under the head "Salaries" including the income referred to in the said clause, and shall be construed as if it were a tax deductible at source from the income under the head "Salaries", and be subject to the provisions of this Chapter.