What is the highest interest rate I can charge on a personal loan?

Maryland law imposes various limits on interest rates, but much depends on WHO is loaning, to WHOM and for WHAT purpose and WHAT collateral.  Additionally, lenders should be very careful to ensure that they comply with any registration and/or licensure requirements.  an occasional loan to a family member or close friend probably will not trigger licensure but one is well advised to seek legal counsel on the specifics of the contemplated loan before drawing up the documents.