The Internal Revenue Service says interest rates will remain the same for the calendar quarter that starts July 1. That means the rates will be:
- 4 percent for overpayments (3 percent in the case of a corporation);
- 4 percent for underpayments;
- 6 percent for large corporate underpayments; and
- 5 percent for the portion of a corporate overpayment that exceeds $10,000.
For taxpayers – other than corporations – the overpayment and underpayment rate is the federal short-term rate plus 3 percentage points.
For corporations, the underpayment rate is generally the federal short-term rate plus 3 percentage points, while the overpayment rate is the federal rate plus 2 percentage points. In the case of large corporations, the underpayment rate is the federal short-term rate plus 5 percentage points. The overpayment rate is figured on the part of a corporate overpayment exceeding $10,000 for the taxable period, and the federal rate plus half a percentage point.