Eight of the biggest U.S. banks are about to find out just how risky the Federal Reserve thinks they really are.

Global regulators have already agreed that the world’s biggest banks, including JPMorgan Chase & Co. and Citigroup Inc., need to have extra capital to absorb losses in a crisis. Federal Reserve Governor Daniel Tarullo has said the U.S. requirement should be more stringent than the international standard and take into account how banks borrow money to determine how much more capital they need.