I think a private enterprises in the U.S. can refuse money, so your bank can refuse that 1000$ bill at their discretion (and pissing you off as a customer in th

I think a private enterprises in the U.S. can refuse money, so your bank can refuse that 1000$ bill at their discretion (and pissing you off as a customer in the process). However, the government probably is required to take that money to pay nay taxes, although I do not know how you can pay any taxes to the federal U.S. by cash. Maybe a customs duty at a border crossing?