The Federal Reserve said the fees would go to help cover costs of regulating banks. The proposal would require some 70 financial firms to pay about $440 mil total, starting with a back payment for calendar '12. The agency would use an asset-based formula to determine each company's assessment. The '10 Dodd-Frank banking reform law called on the Fed to issue such a proposal to help cover costs of new regulations of banks with $50 bil or more assets. Citigroup (C)shares rose 0.2% to 44.87. BofA (BAC) fell 1.6% to 11.98.