The Internal Revenue Service will keep interest rates that it uses for overpayments and underpayments the same for the calendar quarter beginning Oct. 1, 2020. The rates are:
- 3% for overpayments (2% in the case of a corporation);
- 0.5% for the portion of a corporate overpayment exceeding $10,000;
- 3% percent for underpayments; and
- 5% percent for large corporate underpayments.
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 are computed from the federal short-term rate determined during July 2020 to take effect Aug. 1, 2020, based on daily compounding.
Revenue Ruling 2020-18, announcing the rates of interest, is attached and will appear in Internal Revenue Bulletin 2020-39, dated Sept. 21, 2020.
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