For the purpose of e-filing Income Tax Returns, an individual has to follow the below steps to link Aadhaar with PAN:
Step 1 - Go to the Income Tax Portal for e-Filing.
Step 2 - Click on "Link Aadhaar", under the "Quick Links" section.
Step 3 - The individual will be directed to the “Link Aadhaar” page.
Step 4 - Enter the following fields correctly: PAN, Aadhaar Number, Name and Captcha Code. If the birth year is mentioned on Aadhaar card, select the square that reads "I have only year of birth in Aadhaar Card".
Step 5 - Click on "Link Aadhaar" at the bottom of the page to complete the process.