rr-03-63.pdf

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Part I

Section 6621.-- Determination of Interest Rate

26 CFR 301.6621-1: Interest rate.

Rev. Rul. 2003-63

Section 6621 of the Internal Revenue Code establishes the rates for interest on
tax overpayments and tax underpayments. Under section 6621(a)(1), the overpayment
rate beginning July 1, 2003, is the sum of the federal short-term rate plus 3 percentage
points (2 percentage points in the case of a corporation), except the rate for the portion
of a corporate overpayment of tax exceeding $10,000 for a taxable period is the sum of
the federal short-term rate plus 0.5 of a percentage point for interest computations
made after December 31, 1994. Under section 6621(a)(2), the underpayment rate is
the sum of the federal short-term rate plus 3 percentage points.

Section 6621(c) provides that for purposes of interest payable under section
6601 on any large corporate underpayment, the underpayment rate under section
6621(a)(2) is determined by substituting “5 percentage points” for “3 percentage points.”
See section 6621(c) and 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. Section 6621(c) and section 301.6621-3 are generally
effective for periods after December 31, 1990.

Section 6621(b)(1) provides that the Secretary will determine the federal short-
term rate for the first month in each calendar quarter.

Section 6621(b)(2)(A) provides that the federal short-term rate determined under
section6621(b)(1) for any month applies during the first calendar quarter beginning after
such month.

Section 6621(b)(3) provides that the federal short-term rate for any month is the
federal short-term rate determined during such month by the Secretary in accordance
with section 1274(d), rounded to the nearest full percent (or, if a multiple of 1/2 of 1
percent, the rate is increased to the next highest full percent).

2

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.

Rounded to the nearest full percent, the federal short-term rate based on daily
compounding determined during the month of April 2003 is 2 percent. Accordingly, an
overpayment rate of 5 percent (4 percent in the case of a corporation) and an
underpayment rate of 5 percent are established for the calendar quarter beginning
July 1, 2003. The overpayment rate for the portion of a corporate overpayment
exceeding $10,000 for the calendar quarter beginning July 1, 2003, is 2.5 percent. The
underpayment rate for large corporate underpayments for the calendar quarter
beginning July 1, 2003, is 7 percent. These rates apply to amounts bearing interest
during that calendar quarter.

Interest factors for daily compound interest for annual rates of 2.5 percent, 4
percent, 5 percent, and 7 percent are published in Tables 10, 13, 15, and 19 of Rev.
Proc. 95-17, 1995-1 C.B. 556, 564, 567, 569, and 573.

Annual interest rates to be compounded daily pursuant to § 6622 that apply for
prior periods are set forth in the tables accompanying this revenue ruling.

DRAFTING INFORMATION

The principal author of this revenue ruling is Crystal Foster of the Office of
Associate Chief Counsel (Procedure and Administration). For further information
regarding this revenue ruling, contact Ms. Foster at (202) 622-4652 (not a toll-free call).

3
TABLE OF INTEREST RATES

PERIODS BEFORE JUL. 1, 1975 - PERIODS ENDING DEC. 31, 1986

OVERPAYMENTS AND UNDERPAYMENTS

In 1995-1 C.B.
PERIOD RATE DAILY RATE TABLE

Before Jul. 1, 1975 6% Table 2, pg. 557
Jul. 1, 1975--Jan. 31, 1976 9% Table 4, pg. 559
Feb. 1, 1976--Jan. 31, 1978 7% Table 3, pg. 558
Feb. 1, 1978--Jan. 31, 1980 6% Table 2, pg. 557
Feb. 1, 1980--Jan. 31, 1982 12% Table 5, pg. 560
Feb. 1, 1982--Dec. 31, 1982 20% Table 6, pg. 560
Jan. 1, 1983--Jun. 30, 1983 16% Table 37, pg. 591
Jul. 1, 1983--Dec. 31, 1983 11% Table 27, pg. 581
Jan. 1, 1984--Jun. 30, 1984 11% Table 75, pg. 629
Jul. 1, 1984--Dec. 31, 1984 11% Table 75, pg. 629
Jan. 1, 1985--Jun. 30, 1985 13% Table 31, pg. 585
Jul. 1, 1985--Dec. 31, 1985 11% Table 27, pg. 581
Jan. 1, 1986--Jun. 30, 1986 10% Table 25, pg. 579
Jul. 1, 1986--Dec. 31, 1986 9% Table 23, pg. 577

TABLE OF INTEREST RATES

FROM JAN. 1, 1987 - DEC. 31, 1998

OVERPAYMENTS │ UNDERPAYMENTS
────────────── │──────────────
1995-1 C.B. │ 1995-1 C.B.
RATE TABLE PG │RATE TABLE PG

Jan. 1, 1987--Mar. 31, 1987 8% 21 575 9% 23 577
Apr. 1, 1987--Jun. 30, 1987 8% 21 575 9% 23 577
Jul. 1, 1987--Sep. 30, 1987 8% 21 575 9% 23 577
Oct. 1, 1987--Dec. 31, 1987 9% 23 577 10% 25 579
Jan. 1, 1988--Mar. 31, 1988 10% 73 627 11% 75 629
Apr. 1, 1988--Jun. 30, 1988 9% 71 625 10% 73 627
Jul. 1, 1988--Sep. 30, 1988 9% 71 625 10% 73 627
Oct. 1, 1988--Dec. 31, 1988 10% 73 627 11% 75 629
Jan. 1, 1989--Mar. 31, 1989 10% 25 579 11% 27 581
Apr. 1, 1989--Jun. 30, 1989 11% 27 581 12% 29 583
Jul. 1, 1989--Sep. 30, 1989 11% 27 581 12% 29 583

4
Oct. 1, 1989--Dec. 31, 1989 10% 25 579 11% 27 581
Jan. 1, 1990--Mar. 31, 1990 10% 25 579 11% 27 581
Apr. 1, 1990--Jun. 30, 1990 10% 25 579 11% 27 581
Jul. 1, 1990--Sep. 30, 1990 10% 25 579 11% 27 581
Oct. 1, 1990--Dec. 31, 1990 10% 25 579 11% 27 581
Jan. 1, 1991--Mar. 31, 1991 10% 25 579 11% 27 581
Apr. 1, 1991--Jun. 30, 1991 9% 23 577 10% 25 579
Jul. 1, 1991--Sep. 30, 1991 9% 23 577 10% 25 579
Oct. 1, 1991--Dec. 31, 1991 9% 23 577 10% 25 579
Jan. 1, 1992--Mar. 31, 1992 8% 69 623 9% 71 625
Apr. 1, 1992--Jun. 30, 1992 7% 67 621 8% 69 623
Jul. 1, 1992--Sep. 30, 1992 7% 67 621 8% 69 623
Oct. 1, 1992--Dec. 31, 1992 6% 65 619 7% 67 621
Jan. 1, 1993--Mar. 31, 1993 6% 17 571 7% 19 573
Apr. 1, 1993--Jun. 30, 1993 6% 17 571 7% 19 573
Jul. 1, 1993--Sep. 30, 1993 6% 17 571 7% 19 573
Oct. 1, 1993--Dec. 31, 1993 6% 17 571 7% 19 573
Jan. 1, 1994--Mar. 31, 1994 6% 17 571 7% 19 573
Apr. 1, 1994--Jun. 30, 1994 6% 17 571 7% 19 573
Jul. 1, 1994--Sep. 30, 1994 7% 19 573 8% 21 575
Oct. 1, 1994--Dec. 31, 1994 8% 21 575 9% 23 577
Jan. 1, 1995--Mar. 31, 1995 8% 21 575 9% 23 577
Apr. 1, 1995--Jun. 30, 1995 9% 23 577 10% 25 579
Jul. 1, 1995--Sep. 30, 1995 8% 21 575 9% 23 577
Oct. 1, 1995--Dec. 31, 1995 8% 21 575 9% 23 577
Jan. 1, 1996--Mar. 31, 1996 8% 69 623 9% 71 625
Apr. 1, 1996--Jun. 30, 1996 7% 67 621 8% 69 623
Jul. 1, 1996--Sep. 30, 1996 8% 69 623 9% 71 625
Oct. 1, 1996--Dec. 31, 1996 8% 69 623 9% 71 625
Jan. 1, 1997--Mar. 31, 1997 8% 21 575 9% 23 577
Apr. 1, 1997--Jun. 30, 1997 8% 21 575 9% 23 577
Jul. 1, 1997--Sep. 30, 1997 8% 21 575 9% 23 577
Oct. 1, 1997--Dec. 31, 1997 8% 21 575 9% 23 577
Jan. 1, 1998--Mar. 31, 1998 8% 21 575 9% 23 577
Apr. 1, 1998--Jun. 30, 1998 7% 19 573 8% 21 575
Jul. 1, 1998--Sep. 30, 1998 7% 19 573 8% 21 575
Oct. 1, 1998--Dec. 31, 1998 7% 19 573 8% 21 575

5
TABLE OF INTEREST RATES

FROM JANUARY 1, 1999 – PRESENT

NONCORPORATE OVERPAYMENTS AND UNDERPAYMENTS

1995-1 C.B.
RATE TABLE PAGE

Jan. 1, 1999--Mar. 31, 1999 7% 19 573
Apr. 1, 1999--Jun. 30, 1999 8% 21 575
Jul. 1, 1999--Sep. 30, 1999 8% 21 575
Oct. 1, 1999--Dec. 31, 1999 8% 21 575
Jan. 1, 2000--Mar. 31, 2000 8% 69 623
Apr. 1, 2000--Jun. 30, 2000 9% 71 625
Jul. 1, 2000--Sep. 30, 2000 9% 71 625
Oct. 1, 2000--Dec 31, 2000 9% 71 625
Jan. 1, 2001--Mar. 31, 2001 9% 23 577
Apr. 1, 2001--Jun. 30, 2001 8% 21 575
Jul. 1, 2001--Sep. 30, 2001 7% 19 573
Oct. 1, 2001--Dec. 31, 2001 7% 19 573
Jan. 1, 2002--Mar. 31, 2002 6% 17 571
Apr. 1, 2002--Jun. 30, 2002 6% 17 571
Jul. 1, 2002—Sep. 30, 2002 6% 17 571
Oct. 1, 2002—Dec. 31, 2002 6% 17 571
Jan. 1, 2003—Mar. 31, 2003 5% 15 569
Apr. 1, 2003—Jun. 30, 2003 5% 15 569
Jul. 1, 2003—Sep. 30, 2003 5% 15 569

6
TABLE OF INTEREST RATES

FROM JANUARY 1, 1999 – PRESENT

CORPORATE OVERPAYMENTS AND UNDERPAYMENTS

OVERPAYMENTS │ UNDERPAYMENTS
──────────── │──────────────
1995-1 C.B. │ 1995-1 C.B.
RATE TABLE PG │ RATE TABLE PG

Jan. 1, 1999--Mar. 31, 1999 6% 17 571 7% 19 573
Apr. 1, 1999--Jun. 30, 1999 7% 19 573 8% 21 575
Jul. 1, 1999--Sep. 30, 1999 7% 19 573 8% 21 575
Oct. 1, 1999--Dec. 31, 1999 7% 19 573 8% 21 575
Jan. 1, 2000--Mar. 31, 2000 7% 67 621 8% 69 623
Apr. 1, 2000--Jun. 30, 2000 8% 69 623 9% 71 625
Jul. 1, 2000--Sep. 30, 2000 8% 69 623 9% 71 625
Oct. 1, 2000--Dec. 31, 2000 8% 69 623 9% 71 625
Jan. 1, 2001--Mar. 31, 2001 8% 21 575 9% 23 577
Apr. 1, 2001--Jun. 30, 2001 7% 19 573 8% 21 575
Jul. 1, 2001--Sep. 30, 2001 6% 17 571 7% 19 573
Oct. 1, 2001--Dec. 31, 2001 6% 17 571 7% 19 573
Jan. 1, 2002--Mar. 31, 2002 5% 15 569 6% 17 571
Apr. 1, 2002--Jun. 30, 2002 5% 15 569 6% 17 571
Jul. 1, 2002—Sep. 30, 2002 5% 15 569 6% 17 571
Oct. 1, 2002—Dec. 31, 2002 5% 15 569 6% 17 571
Jan. 1, 2003—Mar. 31, 2003 4% 13 567 5% 15 569
Apr. 1, 2003—Jun. 30, 2003 4% 13 567 5% 15 569
Jul. 1, 2003 –Sep. 30, 2003 4% 13 567 5% 15 569

7
TABLE OF INTEREST RATES FOR
LARGE CORPORATE UNDERPAYMENTS

FROM JANUARY 1, 1991 – PRESENT

1995-1 C.B.
RATE TABLE PAGE

Jan. 1, 1991--Mar. 31, 1991 13% 31 585
Apr. 1, 1991--Jun. 30, 1991 12% 29 583
Jul. 1, 1991--Sep. 30, 1991 12% 29 583
Oct. 1, 1991--Dec. 31, 1991 12% 29 583
Jan. 1, 1992--Mar. 31, 1992 11% 75 629
Apr. 1, 1992--Jun. 30, 1992 10% 73 627
Jul. 1, 1992--Sep. 30, 1992 10% 73 627
Oct. 1, 1992--Dec. 31, 1992 9% 71 625
Jan. 1, 1993--Mar. 31, 1993 9% 23 577
Apr. 1, 1993--Jun. 30, 1993 9% 23 577
Jul. 1, 1993--Sep. 30, 1993 9% 23 577
Oct. 1, 1993--Dec. 31, 1993 9% 23 577
Jan. 1, 1994--Mar. 31, 1994 9% 23 577
Apr. 1, 1994--Jun. 30, 1994 9% 23 577
Jul. 1, 1994--Sep. 30, 1994 10% 25 579
Oct. 1, 1994--Dec. 31, 1994 11% 27 581
Jan. 1, 1995--Mar. 31, 1995 11% 27 581
Apr. 1, 1995--Jun. 30, 1995 12% 29 583
Jul. 1, 1995--Sep. 30, 1995 11% 27 581
Oct. 1, 1995--Dec. 31, 1995 11% 27 581
Jan. 1, 1996--Mar. 31, 1996 11% 75 629
Apr. 1, 1996--Jun. 30, 1996 10% 73 627
Jul. 1, 1996--Sep. 30, 1996 11% 75 629
Oct. 1, 1996--Dec. 31, 1996 11% 75 629
Jan. 1, 1997--Mar. 31, 1997 11% 27 581
Apr. 1, 1997--Jun. 30, 1997 11% 27 581
Jul. 1, 1997--Sep. 30, 1997 11% 27 581
Oct. 1, 1997--Dec. 31, 1997 11% 27 581
Jan. 1, 1998--Mar. 31, 1998 11% 27 581
Apr. 1, 1998--Jun. 30, 1998 10% 25 579
Jul. 1, 1998--Sep. 30, 1998 10% 25 579
Oct. 1, 1998--Dec. 31, 1998 10% 25 579
Jan. 1, 1999--Mar. 31, 1999 9% 23 577
Apr. 1, 1999--Jun. 30, 1999 10% 25 579
Jul. 1, 1999--Sep. 30, 1999 10% 25 579
Oct. 1, 1999--Dec. 31, 1999 10% 25 579
Jan. 1, 2000--Mar. 31, 2000 10% 73 627
Apr. 1, 2000--Jun. 30, 2000 11% 75 629

8
Jul. 1, 2000--Sep. 30, 2000 11% 75 629
Oct. 1, 2000--Dec. 31, 2000 11% 75 629
Jan. 1, 2001--Mar. 31, 2001 11% 27 581
Apr. 1, 2001--Jun. 30, 2001 10% 25 579
Jul. 1, 2001--Sep. 30, 2001 9% 23 577
Oct. 1, 2001--Dec. 31, 2001 9% 23 577
Jan. 1, 2002--Mar. 31, 2002 8% 21 575
Apr. 1, 2002--Jun. 30, 2002 8% 21 575
Jul. 1, 2002—Sep. 30, 2002 8% 21 575
Oct. 1, 2002—Dec. 31, 2002 8% 21 575
Jan. 1, 2003—Mar. 31, 2003 7% 19 573
Apr. 1, 2003—Jun. 30, 2003 7% 19 573
Jul. 1, 2003—Sep. 30, 2003 7% 19 573

TABLE OF INTEREST RATES FOR CORPORATE
OVERPAYMENTS EXCEEDING $10,000

FROM JANUARY 1, 1995 – PRESENT

1995-1 C.B.
RATE TABLE PAGE

Jan. 1, 1995--Mar. 31, 1995 6.5% 18 572
Apr. 1, 1995--Jun. 30, 1995 7.5% 20 574
Jul. 1, 1995--Sep. 30, 1995 6.5% 18 572
Oct. 1, 1995--Dec. 31, 1995 6.5% 18 572
Jan. 1, 1996--Mar. 31, 1996 6.5% 66 620
Apr. 1, 1996--Jun. 30, 1996 5.5% 64 618
Jul. 1, 1996--Sep. 30, 1996 6.5% 66 620
Oct. 1, 1996--Dec. 31, 1996 6.5% 66 620
Jan. 1, 1997--Mar. 31, 1997 6.5% 18 572
Apr. 1, 1997--Jun. 30, 1997 6.5% 18 572
Jul. 1, 1997--Sep. 30, 1997 6.5% 18 572
Oct. 1, 1997--Dec. 31, 1997 6.5% 18 572
Jan. 1, 1998--Mar. 31, 1998 6.5% 18 572
Apr. 1, 1998--Jun. 30, 1998 5.5% 16 570
Jul. 1. 1998--Sep. 30, 1998 5.5% 16 570
Oct. 1, 1998--Dec. 31, 1998 5.5% 16 570
Jan. 1, 1999--Mar. 31, 1999 4.5% 14 568
Apr. 1, 1999--Jun. 30, 1999 5.5% 16 570
Jul. 1, 1999--Sep. 30, 1999 5.5% 16 570
Oct. 1, 1999--Dec. 31, 1999 5.5% 16 570
Jan. 1, 2000--Mar. 31, 2000 5.5% 64 618
Apr. 1, 2000--Jun. 30, 2000 6.5% 66 620
Jul. 1, 2000--Sep. 30, 2000 6.5% 66 620

9
Oct. 1, 2000--Dec. 31, 2000 6.5% 66 620
Jan. 1, 2001--Mar. 31, 2001 6.5% 18 572
Apr. 1, 2001--Jun. 30, 2001 5.5% 16 570
Jul. 1, 2001--Sep. 30, 2001 4.5% 14 568
Oct. 1, 2001--Dec. 31, 2001 4.5% 14 568
Jan. 1, 2002--Mar. 31, 2002 3.5% 12 566
Apr. 1, 2002—Jun. 30, 2002 3.5% 12 566
Jul. 1, 2002—Sep. 30, 2002 3.5% 12 566
Oct. 1, 2002—Dec. 31, 2002 3.5% 12 566
Jan. 1, 2003—Mar. 31, 2003 2.5% 10 564
Apr. 1, 2003—Jun. 30, 2003 2.5% 10 564
Jul. 1, 2003—Sep. 30, 2003 2.5% 10 564