In a letter to Federal Reserve Chairman Ben Bernanke and Comptroller of the Currency Tom Curry, Brown urged them to end tax deductions the banks would get from claiming expenses related to the legal settlements.
Under current law, companies are able to deduct the full value of any settlement payouts from their federal taxes.
"I urge you, the Justice Department, and the other financial regulators to adopt the practice employed by the Securities and Exchange Commission (SEC), which prohibits companies from deducting settlement costs as a business expense," the letter stated. "This rule should apply to this settlement as well as any future settlements with financial institutions. For too long, too many have treated breaking the law as a cost of doing business. It is not."
Brown said the $8.5 billion settlement would help about 96,000 Ohioans.