It has become a mandatory process to link your PAN with Aadhaar. This is an important process because this will allow your income tax returns to be processed. For new applicants of PAN card, the Aadhaar PAN linking is done automatically. Linking your PAN with Aadhaar is now a compulsory requirement. This step is crucial, as it ensures your income tax returns are processed without delays. For individuals applying for a new... 3. How to link Aadhaar and PAN? Both registered and unregistered users can link their Aadhaar and PAN on the e-filling portal,even without logging in. You can use the quick link Link Aadhaar on the e-Filing home page to link Aadhaar and PAN. 4. What will happen if I don't link Aadhaar and PAN? Link Aadhar with Pan - A guide with screenshots on how to link Aadhaar to PAN Card. It is compulsory to provide both Aadhaar and PAN number while filing Income Tax Return (ITR).