The IRS announced interest rates will remain the same for the calendar quarter beginning Oct. 1, 2024. 

For individuals, the rate for overpayments and underpayments will be 8% per year, compounded daily. 

Here’s a complete list of the new rates: 

• 8% for overpayments (payments made in excess of the amount owed), 7% for corporations. 

• 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 (0.5) of a percentage point.  

The interest rates announced today are computed from the federal short-term rate determined during July 2024. 

See Revenue Ruling 2024-18 for details, which announces the rates of interest, and will appear in Internal Revenue Bulletin 2024-37, dated Sept. 9, 2024.