The IRS has announced that the interest rates for the calendar quarter beginning January 1, 2006 will continue at the same level as for the previous quarter, as follows:

• 7% for overpayments (6% in the case of a corporation)
• 7% for underpayments
• 9% for large corporate underpayments
• 4.5% for the portion of a corporate overpayment exceeding $10,000.

...back to 15 December 2005


Further information:
No Change in Interest Rate for First Quarter 2006
Determination of Interest Rate

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The IRS has announced that the interest rates for the calendar quarter beginning October 1, 2005 will continue at the same level as for the previous quarter, as follows:

• 7% for overpayments (6% in the case of a corporation)
• 7% for underpayments
• 9% for large corporate underpayments
• 4.5% for the portion of a corporate overpayment exceeding $10,000.

...back to 1 September 2005


Further information:
Interest Rates Rise 1 Percentage Point in Fourth Quarter 2005
Section 6621.--Determination of Interest Rate

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