The deadline for linking PAN with Aadhaar for taxpayers was to end today.
This comes at a time when the government has granted a similar extension for furnishing of Aadhaar for availing the benefits of various social welfare schemes.
The revenue department will notify December 31as the due date for linkage.
Also, the Supreme Court is hearing petitions challenging the government's decision on Aadhaar and has posted the matter for next hearing in November.
And so, the extension was in line, the source said.
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However, those categorised as non-resident Indians as per the Income Tax laws, people who are not citizens of India, those above 80 years of age and residents of the states of Assam, Meghalaya and Jammu and Kashmir had been exempt from the requirement.
The source further said that people who do not have Aadhaar can file their Income Tax returns, but their returns will not be processed till they submit their Aadhaar number.
Incidentally,December 31is also the deadline for people to link their bank accounts with Aadhaar.
Tax filers, however, were allowed to file their annual income returns by August 5 without linking their Aadhaar with PAN.
They were to just quote Aadhaar or the acknowledgement number for having applied for the ID.
It had further stated that "income-tax returns filed will not be processed should tax filers fail to link Aadhaar and PAN on or before August 31, 2017. "