Bulgaria Three Month Interbank Rate was quoted at -0.23 percent on Monday August 5. Interbank Rate in Bulgaria averaged 2.28 percent from 2003 until 2019, reaching an all time high of 7.28 percent in November of 2008 and a record low of -0.23 percent in June of 2018. In Bulgaria, the interbank rate is the rate of interest charged on short-term loans made between banks. This page provides – Bulgaria up to 1 Day Interbank Rate – actual values, historical data, forecast, chart, statistics, economic calendar and news.