Employer's liability to deduct and pay tax on behalf of employees.

The tax payable under this Act by any person earning a salary or wage, shall be deducted by his employer from the salary or wages payable to such person, before such salary or wages is paid to him, and such employer shall, irrespective of whether such deduction has been made or not, when the salary or wage is paid to such person, be liable to pay tax on behalf of all such persons: Provided that where any person earning a salary or wage, who is covered by any entry of the Schedule is simultaneously engaged in employment of more than one employer, and such person furnishes to his employer or employers a declaration in the prescribed form to the effect that he has obtained a certificate of enrolment under sub-section (2) of section 6 and that he shall pay the tax himself, no deduction or payment of tax shall be made by the employer or employers under this section and such employer or employers, as the case may be, shall not be liable to pay the tax on behalf of such person.