RCW 50.24.190: Limitation of actions.

The commissioner shall commence action for the collection of contributions, interest, penalties, and benefit overpayments imposed by this title by assessment or suit within three years after a return is filed or notice of benefit overpayment is served. No proceedings for the collection of such amounts shall be begun after the expiration of such period.

In case of a false or fraudulent return with intent to evade contributions, interest, or penalties, or in the event of a failure to file a return, the contributions, interest, and penalties may be assessed or a proceeding in court for the collection thereof may be begun at any time.