Williamson supports making middle-class tax cuts permanent and repealing the corporate tax cuts in the 2017 Tax Bill. She also supports the restoration and "modernization" of the Glass-Steagall Act, with the intent of separating commercial banks from investment banks in order to prevent banks from making risky investments. Williamson supports preventing corporations from engaging in tax avoidance, including tax avoidance for carried interest and ETF income. She also supports enforcement of antitrust laws and the implementation of a federal fee for financial transactions such as buying stocks or exchanging currency. Williamson also supports independent regulation of the pharmaceutical industry to prevent what she has called "predatory practices":