How to add an Aadhaar number to a PAN card?

To add your Aadhaar number to your PAN card, visit the official Income Tax e-Filing portal and select the Link Aadhaar option. Enter your PAN and Aadhaar details, validate them, and pay the required fee of 1,000 rupees if applicable. Alternatively, you can link them by sending an SMS in the format UIDPAN <12-digit Aadhaar> <10-digit PAN> to 567678 or 56161. Ensuring these are linked is mandatory for your PAN to remain operative for financial transactions and tax filings.