Usury prohibited
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
No reservation business may take or receive money, goods, or other things of value for a loan or forbearance on a debt that exceeds in value the principal plus twenty-four percent (24 percent) per annum finance charge. Any reservation business contracting for, reserving, or receiving directly or indirectly, any greater amount shall forfeit the finance charge.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.