Four Aadhaar-Linking Deadlines You Should Not Miss. Details Here Be it linking of Aadhaar card with PAN card, SIM card or bank account, there are different deadlines specified in each case. Aadhaar or Unique Identification Number (UID) is a 12-digit identification number issued by the UIDAI. Story Highlights Aadhaar mandatory for filing income tax return, obtaining PAN December 31 is last date to link Aadhaar card with PAN card Mobile phone users need to link SIM with Aadhaar by February The government has mandated linking of Aadhaar to many essentials such as PAN, income tax returns (ITRs) and mobile phone. All SIMs (mobile phone numbers) not linked with Aadhaar will be deactivated after February 2018, according to a report by news agency Indo-Asian News Service (IANS) citing informed sources. The government is moving ahead with linking Aadhaar with mobile SIM cards , the agency further said. Aadhaar number is also to be shared with financial institutions and...