Immediate Rates: Less than 24 Hours: Prime Rates for the United States was 8.50% in December of 2023, according to the United States Federal Reserve. Historically, Immediate Rates: Less than 24 Hours: Prime Rates for the United States reached a record high of 20.50 in August of 1981 and a record low of 3.25 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Immediate Rates: Less than 24 Hours: Prime Rates for the United States - last updated from the United States Federal Reserve on May of 2024.