

IR-2009-54, May 28, 2009
WASHINGTON — The Internal Revenue Service today announced that interest rates for the calendar quarter beginning July 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 April 2009 to take effect May 1, 2009, based on daily compounding.
Revenue Ruling 2009-17PDF, announcing the rates of interest, is attached and will appear in Internal Revenue Bulletin No. 2009-26, dated June 29, 2009.
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