There is no federal law that says all businesses must accept cash. https://web.archive.org/web/20220127202620/https://www.treasury.gov/resource-center/faqs/Cur

There is no federal law that says all businesses must accept cash. https://web.archive.org/web/20220127202620/https://www.treasury.gov/resource-center/faqs/Currency/Pages/legal-tender.aspx#close https://web.archive.org/web/20220127202620/https://www.treas...