Washington Revised Code Title 50A. Family and Medical Leave § 50A.45.025. Delinquency--Accrual of interest

If premiums are not paid on the date on which they are due and payable as prescribed by the commissioner, the whole or part thereof remaining unpaid shall bear interest at the rate of one percent per month or fraction thereof from and after such date until payment plus accrued interest is received by him or her. The date as of which payment of premiums, if mailed, is deemed to have been received may be determined by such regulations as the commissioner may prescribe. Interest collected pursuant to this section shall be paid into the family and medical leave enforcement account. Interest shall not accrue on premiums from any estate in the hands of a receiver, executor, administrator, trustee in bankruptcy, common law assignee, or other liquidating officer subsequent to the date when such receiver, executor, administrator, trustee in bankruptcy, common law assignee, or other liquidating officer qualifies as such, but premiums accruing with respect to employment of persons by any receiver, executor, administrator, trustee in bankruptcy, common law assignee, or other liquidating officer shall become due and shall draw interest in the same manner as premiums due from other employers. Where adequate information has been furnished to the department and the department has failed to act or has advised the employer of no liability or inability to decide the issue, interest may be waived.