N.D. Cent. Code § 40-24-02: Payment of special assessments - Interest

All special assessments levied under this title may be paid without interest within ten days after they have been approved by the governing body and thereafter shall bear interest at an annual rate not exceeding one and one-half percentage points above the average net annual interest rate on any warrants or bonds for the payment of which they are pledged on the total amount thereof remaining unpaid.