

IR-2005-85, Sept. 1, 2005
WASHINGTON — The Internal Revenue Service today announced there will be a one-percentage-point increase in interest rates for the calendar quarter beginning Oct. 1, 2005. The interest rates are as follows:
• Seven (7) percent for overpayments [six (6) percent in the case of a corporation];
• Seven (7) percent for underpayments;
• Nine (9) percent for large corporate underpayments; and
• Four and one-half (4.5) 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 based on daily compounding determined during July 2005.
Rev. Rul. 2005-62 announces the new rates of interest and will appear in Internal Revenue Bulletin No. 2005-38, dated Sept. 19, 2005.
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