

IR-2008-139, Dec. 10, 2008           
WASHINGTON – The Internal Revenue Service today announced in Revenue Ruling 2008-54 that interest rates for the calendar quarter beginning Jan. 1, 2009 will drop by one percentage point. The new rates will be: 
Five (5) percent for overpayments [four (4) percent in the case of a corporation];
Five (5) percent for underpayments;
Seven (7) percent for large corporate underpayments; and
Two and one-half (2.5) 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 October 2008 to take effect Nov. 1, 2008, based on daily compounding.
Revenue Ruling 2008-54PDF, announcing the new rates of interest, is attached and will appear in Internal Revenue Bulletin No. 2008-52, dated Dec. 29, 2008.
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