Just as the Biden administration is pushing to raise taxes on corporations, a new study finds that at least 55 of America's largest firms paid no taxes last year on billions of dollars in profits. The sweeping tax bill passed in 2017 by a Republican Congress and signed into law by President Donald Trump reduced the corporate tax rate to 21% from 35%. But dozens of Fortune 500 companies were able to further shrink their tax bill sometimes to zero " thanks to a range of legal deductions and exemptions that have become staples of the tax code. Salesforce, Archer-Daniels-Midland and Consolidated Edison were among those named in the report, which was done by the Institute on Taxation and Economic Policy. Twenty-six of the companies listed, including FedEx, Duke Energy and Nike, were able to avoid paying any federal income tax for the last three years even though they reported a combined income of $77 billion. Many also received millions of dollars in tax rebates. Publicly traded corporations are required to file financial reports. The institute used that data along with other information supplied by each company. The $2.2 trillion coronavirus relief act ... contained a provision that temporarily allowed businesses to use losses in 2020 to offset profits earned in previous years. Tax avoidance strategies include a mix of old standards and new innovations. Companies, for example, saved billions by allowing top executives to buy discounted stock options in the future and then deducting their value as a loss.