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IRS says interest rates to remain same for Q4 2010

WASHINGTON, DC — The Internal Revenue Service announced that interest rates for the calendar quarter beginning October 1, 2010, 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 are computed from the federal short-term rate during July 2010 to take effect August 1, 2010, based on daily compounding.

Revenue Ruling 2010-21, announcing the rates of interest, will appear in Internal Revenue Bulletin No. 2010-39, dated September 27, 2010.

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