The linking of Aadhar to PAN became mandatory as your tax return would not be processed if your Aadhar is not connected to PAN. If you need to make a bank transaction over Rs 50,000, you will also need to link your PAN and Aadhar accounts. Linking a PAN card https://www.articles.fundzplanner.com/how-to-link-aadhaar-number-to-pan-card/