FILE - This Sept. 13, 2014, file photo, shows the Chase bank logo in New York. The nation’s six big Wall Street banks posted record or near record profits in the first quarter, thanks largely to the recently enacted Trump tax law. Combined, the six banks saved at least $3.59 billion in taxes last quarter, according to an Associated Press estimate, Friday, April 20, 2018, using the bank’s tax rates going back to 2015. (AP Photo/Frank Franklin II, File)

FILE - This Sept. 13, 2014, file photo, shows the Chase bank logo in New York. The nation’s six big Wall Street banks posted record or near record profits in the first quarter, thanks largely to the recently enacted Trump tax law. Combined, the six banks saved at least $3.59 billion in taxes last quarter, according to an Associated Press estimate, Friday, April 20, 2018, using the bank’s tax rates going back to 2015. (AP Photo/Frank Franklin II, File)

NEW YORK (AP) — The nation’s six big Wall Street banks posted record, or near record, profits in the first quarter, and they can thank one person in particular: President Donald Trump.

While higher interest rates allowed banks to earn more from lending in the first quarter, the main boost to bank 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.

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Big publicly traded banks — such JPMorgan Chase, Citigroup, Wells Fargo, Goldman Sachs, Morgan Stanley and Bank of America — typically kick off the earnings season. The reports for the January-March quarter are giving investors and the public their first glimpse into how the new tax law is impacting Corporate America.

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 the highest-taxed bank of the six majors, Citigroup, had a tax rate of 23.7 percent. This is just one quarter’s results, however, and 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.

In its calculation, the AP used an average of full-year tax rates paid by the banks in 2015 and 2016. Full-year tax rates for 2017 were excluded from the calculation since all the banks, with the exception of Wells Fargo, had to take significant one-time charges late last year to come into compliance with the new tax law.

These charges were largely accounting adjustments but caused most of the banks to report a much higher tax rate in 2017 than they would have historically. Including them in the calculations would have distorted the amount of tax savings each bank would have hypothetically had.

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The AP’s calculations are roughly in line with what Wall Street analysts predicted earlier this year. A report by bank industry analyst Mike Mayo of Wells Fargo Securities estimated that that the big U.S. banks combined would save roughly $19 billion in taxes for the full year.

“If there was one significant factor this quarter for the big banks that I follow, it was taxes,” said James Shanahan, an analyst with Edward Jones.

Bank executives have said the majority of the savings from the lower tax rates will be returned to shareholders in the form of higher dividends and stock buybacks. Some of the money has gone toward higher wages for employees, and new business investments.

JPMorgan Chase announced soon after Trump signed the tax law into effect that it would open branches in Washington, D.C., Boston and Philadelphia, all markets where it currently does not have a branch network. Bank of America also announced a branch expansion this year, fueled partly by the tax cuts.

One large financial company that was not included in the AP’s estimate was American Express. The credit card giant saw its effective tax rate drop from 33 percent in 2016 to 21.5 percent this past quarter. American Express paid $262 million less in taxes this past quarter than it would have under the old tax rate. American Express also reported near-record profits last quarter.