Form 12B is a document which an employee shares with the new employer if s/he joins in mid of a financial year.
It is a document which has the details about his previous earnings, deductions and exemptions.
Who generates it?
When an employee parts his/her ways with an organization, the organization issues a Form 16. Using the Form 16-part B, the employee fills
in the details in Form 12B and shares it with the new employer.