The nation's six big Wall Street banks posted record, or near record, profits in the first quarter. While higher interest rates allowed banks to earn more from lending in the first quarter, the main boost ... came from the billions of dollars they saved in taxes under the tax law Trump signed in December. Combined, the six banks saved at least $3.59 billion last quarter, according to an Associated Press estimate, using the bank's tax rates going back to 2015. Before the change in tax law, the maximum U.S. corporate income tax rate was 35 percent, not including what companies paid in state income taxes. Banks historically paid some of the highest taxes among the major industries, due to their U.S.-centric business models. Before the Trump tax cuts, these banks paid between 28 to 31 percent of their income each year in corporate taxes. The results released over the past week show how sharply those rates have dropped. JPMorgan Chase said it had a first-quarter tax rate of 18.3 percent, Goldman Sachs paid just 17.2 percent in taxes, and ... Citigroup, had a tax rate of 23.7 percent. This is just one quarter's results. Bank executives at the big six firms have estimated that their full-year tax rates will be something closer to 20 percent to 22 percent. The AP's calculations are roughly in line with what Wall Street analysts predicted. Bank industry analyst Mike Mayo ... estimated that that the big U.S. banks combined would save roughly $19 billion in taxes for the full year.