If all, or more than one-third (1/3) of a judgment be paid after the levy for the first third thereof becomes final, out of surplus cash as hereinbefore provided, levies to reimburse the sinking fund shall thereafter be made only if there be other outstanding indebtedness, in the same manner as if such prepayment had not been made, but levy for interest shall not be included on such prepaid portion other than for interest paid in excess of that already provided for by tax levy.
Laws 1943, p. 146, § 6.