When you start a new job, your employer will ask you for your Permanent Account Number (PAN).
This is a 10 digit number issued by the Income Tax Department which helps you file taxes.
Click here for more info https://india.gov.in/apply-online-new-pan-card
Typically your new employer will ask you to fill out your PAN Details. If you don’t give your employer your PAN, they are required by law to take the tax of your wages and pay it to the Income Tax Department instead of to you.
Your PAN is how the Income Tax Department keeps a record of your taxable income. Everyone has a different number and your unique number will remain the same forever regardless of whether you move, marry or change jobs.
Be careful with your PAN – this number is very important and should not be shared with anyone. There are exceptions such as your bank, employer and for the purpose of a few government documents.