From Financial Year 2013-14 (AY: 2014-15), while preparing the employee details to file TDS Returns (Form 24Q) in the 4th quarter (Jan-Mar), a provision has been made to separate out the salary earnings of the current and previous employer. This is applicable in case the employee has earned from more than one employer during the course of the year.
This is not applicable for FY: 2012-13. Filing of Form 24Q pertaining the quarter ended March 2013, would be in the same way as before.