An Aadhaar OTP can also be used to e-verify a tax return. To do so, you must link your Aadhaar with your PAN as well as your registered mobile number. After that, you must e-verify by completing the steps below: a. Select e-verify return from the e-file menu. b. Select Option 3 – “I would like to generate Aadhaar OTP to e-verify my return” from the e-verify link. c. The taxpayer will receive an OTP on his or her mobile phone. d. After entering the OTP, click the "Submit Aadhaarotp" option.