The official told PTI that the government has decided not to give any more extension beyond the December 31 deadline.
However, the conversion would continue beyond the date on payment of fees, the official said requesting anonymity.
"As of now, there is no proposal to extend the deadline further as the bulk of people - around 30 lakh - have already converted their PIO cards into OCI cards," the official said.
The PIO card was first implemented in 2002 as a benefit to foreign nationals who could establish at least a third generation tie to Indian origin. The PIO card was valid for travel, work, and residence in India for a period of 15 years.
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Prime Minister Narendra Modi had announced in 2014 that the two types of cards would be merged and the Indian diaspora would be given maximum possible benefits.
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