Section 23.20.185 - Interest on past due contributions(a) If contributions are not paid on the date on which they are due, the amount remaining unpaid bears interest at the rate of 12 percent per year from the due date until payment plus accrued interest is received by the department. Interest collected under this section shall be deposited in the clearing account of the unemployment compensation fund.(b) Interest does not accrue on contributions from an estate in the hands of a receiver, executor, administrator, trustee in bankruptcy, common law assignee, or other liquidating officer after the date when the officer qualifies. However, contributions accruing with respect to employment of a person by the officer are due and draw interest in the same manner as contributions due from other employers.(c) Payments of contributions erroneously paid to an unemployment compensation fund of another state which should have been paid to this state and which are refunded by the other state and paid by the employer to this state shall be considered paid to this state at the date of payment of the other state.(d) Interest collected under this section shall periodically be transferred from the clearing account to the training and building fund.