(2) It is mandatory for the applicants to mention either their ''Telephone number'' or valid. This document is a tax invoice and acknowledgement receipt for a PAN application change request.No it is mandatory to fill out PAN application form in Black ink. You must focus on Clear and right information in form. Online Application for New PAN (Form 49A) Guidelines. Click here for detailed Instructions for filling form49A. The document is a Form No. 49A for applying for an Allotment of Permanent Account Number (PAN) in India. It requests basic identifying information. A) Form to be filled legibly in BLOCK LETTERS and preferably in BLACK INK. Form should be filled in.