The Income Tax Department has extended the deadline for linking PAN card with Aadhaar card for one year but from now on you will have to pay a charge for it which was not there till now. So if you don't have a page-based link, check it out like this ...
You can link your PAN with Aadhaar by following process:
a) Open the Income Tax e-filing portal - https://incometaxindiaefiling.gov.in/
b) Register on it (if not already done). Your PAN (Permanent Account Number) will be your user id.
c) Log in by entering the User ID, password and date of birth.
d) A pop up window will appear, prompting you to link your PAN with Aadhaar. If not, go to ‘Profile Settings’ on Menu bar and click on ‘Link Aadhaar’.
e) Details such as name date of birth and gender will already be mentioned as per the PAN details.
f) Verify the PAN details on screen with the ones mentioned on your Aadhaar. Pls. note that if there is a mismatch, you need to get the same corrected in either of the documents.
g) If the details match, enter your Aadhaar number and click on the “link now” button.
h) A pop-up message will inform you that your Aadhaar has been successfully linked to your PAN