When calculating a SEPP using the annuitization or amortization methods, an assumed rate of interest that is not more than 120 percent of the federal mid-term Each month, the IRS provides various prescribed rates for federal income tax purposes. These rates, known as Applicable Federal Rates (or AFRs), are regularly published as revenue rulings. The list below presents the revenue rulings containing these AFRs in reverse chronological order, starting with January 2000.. Enter a term in the Find Box. The IRS has released (Rev. Rul. 2020-06) the Applicable Federal Rates under Sec. 1274(d) of the Internal Revenue Code.These rates are used for various tax purposes, including minimum rates for loans. There are rates for "short-term," "mid-term," and "long-term" instruments.