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When employees leave a company and join a new one in the middle of an FY, their new employer needs to know some key details before crediting the salary to the new employee. These details include the income paid by the previous employer to the employee, TDS (tax deducted at source) transactions already made during the financial year, perquisites paid, etc. This is what makes the submission of Form 12B important. Section 192 (2) of the Income Tax Act, 1961 deals with the documentary requirements that need to be met with respect to tax considerations when an employee changes jobs during a financial year.
Form 12B must be filled out and submitted by an employee to the new employer at the time of changing jobs during a financial year. The main purpose of the form is to help new employers get details about their new employees and deduct TDS from the employee’s salary for the rest of the financial year. Any discrepancy here can increase the tax liability of the employee and also create problems for the new employee to deduct applicable TDS on the employee’s salary. Along with Form 12B, a new employee must furnish the proof of all investments that he has made before 31st March 2019. It is important to note here that Form 12B is applicable to salaried individuals only and that too only if they have switched jobs in the middle of the financial year.
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Form 12B is submitted by an employee to the new employer if there has been a job change during the applicable financial year. Here are the details they need to fill out in Form 12B:
The following is a Form 12B Format sample of the first page. Subsequently, this form also features annexures that require you to provide some key information.

Form 12B Annexure Format
Form 12B typically contains 2 pages of annexures apart from the first page of the form as shown above. The follow is the first Annexure page:

Details to be provided in the first Annexure page include:
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The second annexure of Form 12B is as follows:
Key fields to be filled out in this part of Form 12B include:
Form 12B is to be submitted by all salaried individuals to his/her new employer whenever they change jobs during a financial year. However do note that a self-employed individual taking up a salaried position is not required to submit the form as it applies only when a salaried employee takes up new salaried employment for the applicable FY. The new employer can then calculate the salary of the employee and deduct applicable TDS. It is essential to know that the previous employer is not obliged to provide these details to the new employer and the employee might have to collate it from his/her payslips and Form 26AS.
After an employee submits Form 12B with the new employer, the employer issuing Form 16 at the end of the year will consolidate the details provided by the employee. The employee must verify the details in Form 16 such as income, TDS, etc. issued both by both the old employer and the new one. No discrepancies must be present in Form 16 to avoid any tax-related issues at a later date.
Form 12B and Form 12BA serve different purposes even though they are both issued under Rule No. 26 of the Income Tax Act. Here are the key differences between them:
Form 12B is filled and submitted by the employee to the employer at the time of joining in the middle of the financial year. Form 12BA is issued along with Form 16 by the employer to the employee on 15th June in the FY immediately following the applicable financial year. Thus, Form 12BA for FY 2018-19 will have to be provided by the employer on or before 15th June 2019 (excluding any extension provided by the government).