Home Breadcrumb caret Tax Breadcrumb caret Tax News IRS announces Q1 interest rates The IRS has today announced interest rates will remain the same for the calendar quarter beginning Jan. 1, 2015. By Staff | December 5, 2014 | Last updated on September 15, 2023 1 min read The IRS has announced interest rates will remain the same for the calendar quarter beginning Jan. 1, 2015. The rates will be: 3% for over-payments (2% in the case of a corporation); 3% percent for underpayments; Read: IRS head foresees frustrating tax season 5% for large corporate underpayments; and 0.5% for the portion of a corporate overpayment exceeding $10,000. 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 0.5 of a percentage point. The interest rates announced today are computed from the federal short-term rate determined during October 2014 to take effect Nov. 1, 2014, based on daily compounding. Also read: Tax games: Are some companies playing with fire? Possible U.S. tax changes for snowbirds Staff The staff of Advisor.ca have been covering news for financial advisors since 1998. Save Stroke 1 Print Group 8 Share LI logo