The country's largest lender SBI wrote off bad loans worth Rs 203.39 billion in 2016-17, the highest among all the public sector banks, which had a collective write off of Rs 816.83 billion for the financial year.
Public sector banks' (PSBs) write-off stood at Rs 272.31 billion in 2012-13, government data showed.
The figure has jumped nearly three-fold in five years.
In 2013-14, the state-owned banks wrote off bad loans worth Rs 344.09 billion; Rs 490.18 billion in 2014-15; Rs 575.85 billion in 2015-16 and hitting Rs 816.83 billion in the fiscal ended March 2017.
In the current financial year, PSBs have written off loans worth Rs 536.25 billion in the six months to September.
As per data from the Reserve Bank, nine public sector banks, out of the total 21, had gross non-performing asset ratio of above 15 per cent (the percentage of bad loans in terms of total loans outstanding) as of September 30, 2017.
Fourteen PSBs have gross non-performing asset ratio of over 12 per cent.
PSBs are faced with mounting non-performing assets (NPAs) or bad loans, putting the financial sector under stress. The government has unveiled a Rs 2.11 trillion capital infusion plan for the PSBs, including via bonds, in the next two years.