The IRS 1st Quarter 2026 interest rates will remain the same for the calendar quarter beginning January 1, 2026.
For individuals, the rate for overpayments and underpayments will be 7% per year, compounded daily.
The rates are as follows:
- 7% for overpayments (payments made in excess of the amount owed), 6% for corporations.
- 4.5% for the portion of a corporate overpayment exceeding $10,000.
- 7% for underpayments (taxes owed but not fully paid).
- 9% 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 rates are 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. Contact a member of our Tax Department if you have questions about business and individual tax.