Step 1 :
Just go to www.incometaxindiaefiling.gov.in and click on the link on the left pane – Link Aadhaar
Step 2 :
Provide PAN, Aadhaar no. and ENTER NAME EXACTLY AS GIVEN IN AADHAAR CARD (avoid spelling mistakes) and submit. After verification from UIDAI which is the government website for Aadhaar, the linking will be confirmed.
In case of any minor mismatch in Aadhaar name provided, Aadhaar OTP will be required. Please ensure that the date of birth and gender in PAN and Aadhar are exactly same.
In a rare case where Aadhaar name is completely different from name in PAN, then the linking will fail and taxpayer will be prompted to change the name in either Aadhaar or in PAN database.
The process of linking Aadhaar with PAN is also available after login to the income tax website.