432A.7  Tax payable annually.
  The tax imposed by this chapter shall be paid annually, on or before the first day of June, by every insurer authorized to do the business of marine insurance in this state during any one or more of the preceding three calendar years, and the calendar year next preceding such June 1 shall be deemed the taxable year within the meaning of this section.
[C75, 77, 79, 81, §432A.7]