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The Internal Revenue Service announced that its interest rates will remain the same for the calendar quarter beginning Oct. 1.

The rates will be:

  • 4 percent for overpayments (3 percent in the case of a corporation);
  • 1.5 percent for the portion of a corporate overpayment exceeding $10,000;
  • 4 percent for underpayments; and,
  • 6 percent for large corporate underpayments.

For taxpayers other than corporations, the overpayment and underpayment rate is the federal short-term rate plus three percentage points.

Generally, in the case of a corporation, the underpayment rate is the federal short-term rate plus three percentage points and the overpayment rate is the federal short-term rate plus two percentage points. The rate for large corporate underpayments is the federal short-term rate plus five 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 0.5 of a percentage point.

The interest rates are computed from the federal short-term rate determined during July 2017 to take effect Aug. 1 based on daily compounding.

Revenue Ruling 2017-18, announcing the rates of interest, will appear in Internal Revenue Bulletin 2017-39, dated Sept. 25.

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Jeff Stimpson

Jeff Stimpson

Jeff Stimpson is a veteran freelance journalist who previously served as editor of The Practical Accountant.