Revenue Ruling 2020-12 provides various prescribed rates for federal income tax purposes including the applicable federal interest rates for June 2020, the adjusted applicable federal interest rates, the adjusted federal long-term rate, the adjusted federal long-term tax-exempt rate. These rates are determined as prescribed by § 1274. 

Revenue Ruling 2020-12 will be in IRB:  2020-24, dated June 8, 2020.