Deduction of tax at source

(1) The tax shall be payable in advance under this Act within the financial year next preceding the assessment year by any person in the employment of any Government, Local authority, Company, Firm or other association of persons and shall be deducted in the manner prescribed by the Principal Officer thereon from amount payable to such person on behalf of such Government, Local authority, Company, Firm or other association or persons:

Provided that the advance tax deductable or payable under this sub-section in respect of the total gross income of the previous year relating to the assessment year commencing on the 1st day of April, every year shall be deducted or paid in one instalment by the 30th day of March, every year.