15 July 2013
What is Authentication Code? Authentication code is generated when you clear validation details for a statement for certain functionalities such as Download Form 16 / 16A, Download NSDL Conso File, Download Justification Report, etc. Authentication code generated for a particular statement will be valid for the calendar day (i.e., an authentication code generated on 10-Dec-2012 can be used only on 10-Dec-2012 to clear validation details for the same statement. It will not be valid the next day).