IR-2009-73, Aug. 14, 2009 WASHINGTON — The Internal Revenue Service today announced that interest rates for the calendar quarter beginning Oct. 1, 2009, will remain the same. The rates will be: four (4) percent for overpayments [three (3) percent in the case of a corporation]; four (4) percent for underpayments; six (6) percent for large corporate underpayments; and one and one-half (1.5) percent for the portion of a corporate overpayment exceeding $10,000. Under the Internal Revenue Code, the rate of interest is determined on a quarterly basis. For taxpayers other than corporations, the overpayment and underpayment rate is the federal short-term rate plus 3 percentage points. Generally, in the case of a corporation, the underpayment rate is the federal short-term rate plus 3 percentage points and the overpayment rate is the federal short-term rate plus 2 percentage points. The rate for large corporate underpayments is the federal short-term rate plus 5 percentage points. The rate on the portion of a corporate overpayment of tax exceeding $10,000 for a taxable period is the federal short-term rate plus one-half (0.5) of a percentage point. The interest rates announced today are computed from the federal short-term rate during July 2009 to take effect Aug. 1, 2009, based on daily compounding. Revenue Ruling 2009-27 PDF, announcing the rates of interest, will appear in Internal Revenue Bulletin 2009-39, dated Sept. 28, 2009. Subscribe to IRS Newswire
