Paycheck Protection Program Integrity Act of 2020 This bill modifies loan forgiveness under the Paycheck Protection Program established to support small businesses in response to COVID-19 (i.e., coronavirus disease 2019). Specifically, the bill reduces the amount of loan forgiveness by (1) the amount of a recipient's after-tax income, or (2) the increase in net assets if the recipient is a nonprofit organization. A recipient seeking loan forgiveness must submit documentation verifying after-tax income and net assets to determine any paycheck protection loan repayment. Further, the bill requires the disclosure of paycheck protection loan information in accordance with applicable laws.