PDFWAC 458-18-220

Refunds—Rate of interest.

(1) Introduction. Interest applies to refunds of taxes made pursuant to RCW 84.69.010 through 84.69.090 in accordance with RCW 84.69.100. Interest also applies to judgments entered in favor of the plaintiff pursuant to RCW 84.68.030.
(2) Calculation of interest rate. The interest rate is calculated from the equivalent coupon issue yield of the average bill rate for 26-week treasury bills as determined at the first bill market auction conducted after June 30th of the calendar year preceding the date the taxes were paid.
(3) Interest rates. The following rates are applied to the amount of the judgment or the amount of the refund, until paid:
Year tax
paid
Auction
Year
Rate
1984
1983
9.29%
 
1985
1984
11.27%
 
1986
1985
7.36%
 
1987
1986
6.11%
 
1988
1987
5.95%
 
1989
1988
7.04%
 
1990
1989
8.05%
 
1991
1990
8.01%
 
1992
1991
5.98%
 
1993
1992
3.42%
 
1994
1993
3.19%
 
1995
1994
4.92%
 
1996
1995
5.71%
 
1997
1996
5.22%
 
1998
1997
5.14%
 
1999
1998
5.06%
 
2000
1999
4.96%
 
2001
2000
5.98%
 
2002
2001
3.50%
 
2003
2002
1.73%
 
2004
2003
0.95%
 
2005
2004
1.73%
 
2006
2005
3.33%
 
2007
2006
5.09%
 
2008
2007
4.81%
 
2009
2008
2.14%
 
2010
2009
0.29%
 
2011
2010
0.21%
 
2012
2011
0.08%
 
2013
2012
0.15%
 
2014
2013
0.085%
 
2015
2014
0.060%
 
2016
2015
0.085%
 
2017
2016
0.340%
 
2018
2017
1.130%
 
2019
2018
2.085%
 
2020
2019
2.040%
 
2021
2020
0.165%
 
2022
2021
0.050%
 
2023
2022
2.50%
 
[Statutory Authority: RCW 84.34.065, 84.34.141, 84.34.360, and 84.69.100. WSR 23-01-007, § 458-18-220, filed 12/7/22, effective 1/1/23; WSR 22-04-028, § 458-18-220, filed 1/24/22, effective 1/1/22; WSR 21-01-210, § 458-18-220, filed 12/23/20, effective 1/1/21; WSR 20-02-056, § 458-18-220, filed 12/24/19, effective 1/1/20; WSR 19-02-058, § 458-18-220, filed 12/27/18, effective 1/1/19; WSR 18-01-147, § 458-18-220, filed 12/20/17, effective 1/1/18; WSR 17-01-162, § 458-18-220, filed 12/21/16, effective 1/1/17; WSR 16-01-035, § 458-18-220, filed 12/9/15, effective 1/1/16; WSR 15-01-166, § 458-18-220, filed 12/23/14, effective 1/1/15; WSR 14-01-059, § 458-18-220, filed 12/13/13, effective 1/1/14; WSR 13-02-053, § 458-18-220, filed 12/26/12, effective 1/1/13; WSR 12-01-040, § 458-18-220, filed 12/13/11, effective 1/1/12. Statutory Authority: RCW 84.69.100. WSR 11-02-017, § 458-18-220, filed 12/29/10, effective 1/1/11; WSR 10-07-038, § 458-18-220, filed 3/10/10, effective 4/10/10; WSR 08-24-094, § 458-18-220, filed 12/2/08, effective 1/2/09; WSR 07-24-037, § 458-18-220, filed 11/30/07, effective 12/31/07; WSR 06-21-059, § 458-18-220, filed 10/16/06, effective 11/16/06; WSR 05-22-096, § 458-18-220, filed 11/1/05, effective 12/2/05; WSR 04-24-101, § 458-18-220, filed 12/1/04, effective 1/1/05; WSR 03-24-014, § 458-18-220, filed 11/20/03, effective 12/21/03; WSR 02-23-081, § 458-18-220, filed 11/19/02, effective 12/20/02; WSR 02-03-039, § 458-18-220, filed 1/8/02, effective 2/8/02; WSR 00-24-106, § 458-18-220, filed 12/6/00, effective 12/31/00; WSR 99-24-033, § 458-18-220, filed 11/23/99, effective 12/24/99. Statutory Authority: RCW 84.08.010, 84.08.070 and 84.69.100. WSR 99-01-066, § 458-18-220, filed 12/14/98, effective 1/1/99; WSR 98-01-177, § 458-18-220, filed 12/23/97, effective 1/1/98; WSR 97-02-068, § 458-18-220, filed 12/31/96, effective 1/1/97; WSR 96-01-093, § 458-18-220, filed 12/19/95, effective 1/1/96; WSR 95-06-044, § 458-18-220, filed 2/24/95, effective 3/27/95; WSR 94-05-063, § 458-18-220, filed 2/11/94, effective 3/14/94. Statutory Authority: RCW 84.08.010 and 84.69.100. WSR 93-06-096, § 458-18-220, filed 3/3/93, effective 4/3/93; WSR 92-17-027, § 458-18-220, filed 8/11/92, effective 9/11/92; WSR 91-15-024, § 458-18-220, filed 7/11/91, effective 8/11/91. Statutory Authority: RCW 84.69.100 and 84.08.010(2). WSR 89-10-067 (Order PT 89-6), § 458-18-220, filed 5/3/89; WSR 88-07-003 (Order PT 88-3), § 458-18-220, filed 3/3/88. Statutory Authority: RCW 84.69.100 as amended by 1987 c 319 and 84.08.010(2). WSR 87-19-141 (Order PT 87-7), § 458-18-220, filed 9/23/87.]