IRS Press Release:
IR-2017-53, March 7, 2017
WASHINGTON ― The Internal Revenue Service today announced that interest rates will remain the same for the calendar quarter beginning April 1, 2017. The rates will be:
four (4) percent for overpayments [three (3) percent in the case of a corporation];
1 and one-half (1.5) percent for the portion of a corporate overpayment exceeding $10,000;
four (4) percent for underpayments; and
six (6) percent for large corporate underpayments.
Under the Internal Revenue Code, the rate of interest is determined on a quarterly basis […]