After another money-losing year, Bank of America Corp. got the upper hand with Uncle Sam in 2010.

The Charlotte-based bank had no federal income tax expense for a second straight year and actually reported a tax "benefit" of nearly $1 billion. Also, the bank's billions in accumulated losses could reduce its taxes in future years, a tax expert said.

The bank says the reason is simple: Corporations pay taxes on their profits, and Bank of America posted a pre-tax loss of $5.4 billion in the U.S. in 2010.

"Bank of America takes its role as a corporate citizen very seriously, and pays taxes in accordance with all applicable laws and regulations," bank spokesman Jerry Dubrowski said.

That doesn't satisfy a group that has been staging protests at Bank of America branches around the country and crashed the bank's New York investor conference this month. The bank is an "aggressive tax dodger," said Ryan Clayton, a Washington-based organizer of U.S. Uncut. "We pay our taxes. Why don't they?"

Clayton's group suggests Bank of America and other large U.S. companies are using subsidiaries in offshore tax havens to eliminate their taxes.