Broadband Infrastructure Finance and Innovation Act of 2021 This bill requires the National Telecommunications and Information Administration to make financing available for the construction and deployment of broadband infrastructure through a broadband infrastructure finance and innovation program. Specifically, the bill provides a means for communities and public-private partnerships to apply for low-interest secured loans, lines of credit, or loan guarantees to finance broadband infrastructure investments. The bill requires biennial reports on the financial performance of projects carried out with program assistance.