According to a Standard & Poor's  report the top six banks in the U.S. (Bank of America Corp, JPMorgan  Chase & Co, Wells Fargo & Co, Citigroup Inc, US Bancorp, and  PNC Financial Services Group) could face up to $31 billion in losses  from buying back bad mortgage. 
According to Reuters.com, the financial giants are being pressured to  buy back loans that were packaged and resold to investors.
 
The potential mortgage buyback losses  would affect the banks' future profits, but are "not likely to  affect our view of the banks' capital adequacy," Sharma wrote.
 
But those losses on mortgage buybacks,  combined with the effects of increased regulation and an expected decrease  in net interest income, "will likely hamper the financial recovery  of the U.S. banks in 2011 despite declining credit costs," Sharma  concluded.