how to cancel duplicate pan card

To cancel a duplicate PAN card, which is mandatory as holding multiple PANs is illegal, you have two primary methods:

• Online: Use the NSDL portal's 'Changes or Correction in existing PAN Data' form. Enter the valid PAN at the top and list the duplicate PAN to be cancelled in the designated section of the form.
• Offline: Submit the 'Request for New PAN Card or Changes or Correction in PAN Data' Form (Form 49A) at a PAN centre, noting the duplicate PAN in Item 11. Alternatively, write a surrender letter to your local Income Tax Assessing Officer.