From July 1, you will have to give your Aadhaar number for filing taxes. You also have to link it with your PAN card.Aadhaar number has also become mandatory for getting a passport. Apart from other necessary documents, you will also have to give your Aadhaar number, else you won’t be able to get one.From July 1, you will need Aadhaar number to get a PAN card.If you are booking concessional rail tickets, Aadhaar number is mandatory. You can link the Aadhaar card to your railway login too.The Employees’ Provident Fund Organisation has also made Aadhaar number mandatory.For those looking for free LPG connection, you need a Aadhaar number.