Here is a step-by-step guide to link your PAN card with your Aadhaar card via the web portal
Open the Income Tax e-filing official websites, eportal.incometax.gov.in or incometaxindiaefiling.gov.in
Register on the portal with your (Permanent Account Number) PAN as the user ID if you have not registered already
Log in by typing your User ID, password and date of birth
A pop-up window will appear asking you to link your PAN with your Aadhaar. If not, go to ‘Profile Settings’ on the Menu bar and click on ‘Link Aadhaar’
Your details like name, date of birth, gender and more will already be mentioned as per your PAN card details
Verify your details with your Aadhaar card to make sure there are no discrepancies. If the details match, enter your Aadhaar number and click on the 'Link Now' button
In case of a mismatch in details, you need to get them corrected in either one of your documents
A message will pop up informing you that your Aadhaar card has been successfully linked to your PAN card
You can also visit https://www.utiitsl.com/ OR https://www.egov-nsdl.co.in/ to link your PAN and Aadhaar cards