WAC 192-220-070. Overpayments under RCW 50.12.070 (2)(b)

You are not required to repay benefits improperly paid to you because an employer failed to correctly report your wages or hours and a later correction results in a lower benefit amount or your claim becomes invalid. However, you remain liable for any overpayment assessment resulting from an eligibility decision issued before your claim became invalid that has become final.