PAN / TAN / DSC

Permanent Account Number (PAN) is a ten-digit alphanumeric number, issued in the form of a laminated card, by the Income Tax Department, to any "person" who applies for it or to whom the department allots the number without an application. 

TAN Number is a 10 Digit Alphanumeric Number shortened form utilized for Tax Deduction and Collection Account Number. Each Assessee prone to deduct TDS is required to apply for TAN and will quote this number in all TDS Returns, TDS installments, and some other correspondences in regards to TDS with Income Tax Department.

Digital Signature (DSC) could be a physical mark in an electronic format. Digital Signatures are utilized in India for online exchanges such as Company or LLP Incorporation, E-Tenders, Income Tax E-Filing, Filing Annual Return, and so forth.