On May 16, 2011, the Internal Revenue Service announced that interest rates for the calendar quarter beginning July 1, 2011, will remain the same as in the previous quarter. The rates will be:
- four (4) percent for overpayments (three (3) percent in the case of a corporation);
- four (4) percent for underpayments;
- six (6) percent for large corporate underpayments; and
- one and one-half (1.5) percent for the portion of a corporate overpayment exceeding $10,000.
Section 6621 of the Internal Revenue Code establishes the rates for interest on tax overpayments and tax underpayments. These rates 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. Rev. Rul. 2011-12. 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. Pursuant to I.R.C. section 6621(c), the rate for large corporate underpayments is the federal short-term rate plus 5 percentage points. See section 301.6621-3 of the Regulations on Procedure and Administration for the definition of a large corporate underpayment and for the rules for determining the applicable date.
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.
Notice 88-59, 1988-1 C.B. 546, announced that, in determining the quarterly interest rates to be used for overpayments and underpayments of tax under section 6621, the Internal Revenue Service will use the federal short-term rate based on daily compounding because that rate is most consistent with section 6621 which, pursuant to section 6622, is subject to daily compounding.
Interest factors for daily compound interest for annual rates of 1.5 percent, 3 percent, 4 percent and 6 percent are published in Tables 8, 11, 13, and 17 of Rev. Proc. 95-17, 1995-1 C.B. 556, 562, 567, and 571. Interest factors for daily compound interest for an annual rate of 0.5 percent are published in Appendix A of Revenue Ruling 2010-31, 2010-52 IRB 898, 899. 3.
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