What Should You Do In Case Of Receipt Of Salary From Two Employers?

26A. (1) The assessee may furnish to the person responsible for making the payment referred to in sub-section (1) of section 192, the details of the income under the head Salaries due or received by him from the other employer or employers referred to in sub-section (2) of that section and of any tax deducted at source from such income in Form No. 12B
(2) The person responsible for paying any income chargeable under the head Salaries shall furnish to the person to whom such payment is made, a statement giving correct and complete particulars of perquisites or profits in lieu of salary and the value thereof in,
(a) relevant columns provided in Form No. 16, if the amount of salary paid or payable to the employee is not more than one lakh and fifty thousand rupees; or
(b) Form No. 12BA- if the amount of salary paid or payable to the employee is more than one lakh and fifty thousand rupees, which shall accompany the return of income of the employee.
Explanation : Salary for the purposes of this rule shall have the same meaning as given in rule 3.
So, following procedure should be followed
1. Give to your new employer details of income received from previous employer in Form 12 B.
2. The new employer  would take note of Form 12B  to arrive at estimated income  and then deduct the tax at source.