Can I link my NPS to SBI/Post Office?
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You can do that. The Central Recordkeeping Agency (CRA), which is in charge of NPS accounts, requires that you submit your most recent bank information (NSDL or KFintech).
In order to modify the documents online, first log in to the site, then navigate to "Update Bank Details." Upload the bank proof, then you can download and submit "Form S2" physically to your POP (Point of Presence), like ICICI or SBI.