If you are already registered on the e-filing website, you can link your Aadhaar after logging-in to the e-filing website. Just click on the Aadhaar linking option under profile settings. The details as per PAN will be pre-populated and you only need to enter your Aadhaar number and name exactly as mentioned in Aadhaar. Once you link your Aadhaar with PAN, you will be able to e-verify your income tax return using OTP sent to your mobile.
If your Aadhaar name is completely different from your name in PAN, then the linking will fail and the taxpayer will be prompted to change the name in either Aadhaar or PAN database.
Making corrections in PAN and Aadhaar
In case you want to make corrections in your PAN or Aadhaar, you can do so by going to National Securities Depository Ltd (NSDL) website www.onlineservices.nsdl.com/paam/endUserRegisterContact.html and UIDAI portal https://ssup.uidai.gov.in/web/guest/update respectively.
News Source- Live Mint