On 17 November 2023, the U.S. Internal Revenue Service announced that interest rates will remain unchanged for overpaid and underpaid tax for the calendar quarter beginning 1 January 2024. This means the interest rates remain the same as per the previous quarter.

For individuals, the rate for overpayments and underpayments will be 8% per year, compounded daily. Here is a complete list of the new rates:

  • 8% for overpayments (payments made in excess of the amount owed), 7% for corporations.
  • 5.5% for the portion of a corporate overpayment exceeding $10,000.
  • 8% for underpayments (taxes owed but not fully paid).
  • 10% 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 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 one-half of a percentage point.

The interest rates are computed from the federal short-term rate determined in October 2023.

The new interest rates and past rates will be published in Internal Revenue Bulletin 2023-49, Revenue Ruling 2023-22, on 4 December 2023.