The lender's board has approved raising "Basel III compliant debt instrument-Perpetual Additional Tier I Capital bonds to the extent of Rs 3,000 crore and Tier-II bonds up to Rs 3,000 crore", PNB said in a regulatory filing.
The fund raising would be subject to availability of headroom in one or more tranches, it said.
As part of the capital raising plan, the bank also plans to sell its stake in some non-core businesses.
PNB is planning to list its housing finance firm, PNB Housing Finance, during the current fiscal.
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The Gross Non-Performing Assets (NPAs) rose significantly to 12.9 per cent at the end of March 2016, from 6.55 per cent a year ago. The net NPAs too rose to 8.61 per cent against 4.06 per cent at March 2015.
In absolute terms, the gross NPAs of the bank nearly doubled to Rs 55,818 crore from the year-ago levels.