RCW 82.87.040
Contingency- 2021 c 196 s s 5 and 16: "(1) If a court of competent jurisdiction, in a final judgment not subject to appeal, adjudges section 5 of this act unconstitutional, or otherwise invalid, in its entirety, section 16 of this act is null and void in its entirety. Any credits previously claimed under section 16 of this act must be repaid within 30 days of the department of revenue's notice to the taxpayer of the amount due.
(2) If the taxpayer fails to repay the credit by the due date, interest and penalties as provided in chapter 82.32 RCW apply to the deficiency." [2021 c 196 s 20.]
Automatic expiration date and tax preference performance statement exemption- 2021 c 196 : See note following RCW 82.87.010.