On 23 February 2022, Internal Revenue Service announced that interest rates will increase for the calendar quarter beginning April 1, 2022. The rates will be:

  • 4% for overpayments (3% in the case of a corporation);
  • 1.5% for the portion of a corporate overpayment exceeding $10,000;
  • 4% for underpayments; and
  • 6% 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 January 2022 to take effect February 1, 2022, based on daily compounding.