1. Every company operating under the provisions of sections 380.201 to 380.591 shall quarterly pay a tax upon the direct premiums or assessments received during the calendar year, whether in cash or notes, on account of insurance business done in this state at a rate of one percent per annum for the amount of direct premiums or assessments received in excess of one million dollars. Direct premiums or assessments received by such companies in excess of five million dollars shall be taxed at the rate of two percent per annum. This taxation plan shall be in lieu of all other taxes except taxes on real and tangible personal property, taxes on franchises and license taxes, and those insurance companies shall be credited with cancelled or returned premiums, actually paid during the year in this state.

2. The taxes imposed by the provisions of this section shall be payable on an estimated quarterly basis in the same manner that domestic insurance companies pay tax under the provisions of this chapter, and shall be subject to the same provisions concerning delinquency. Calendar year 1985 will be the first year that companies operating under sections 380.201 to 380.591 are required to pay tax under this section and sections 380.011 to 380.611. The estimated quarterly tax payments for 1985 will be based on the amount of tax that the company would have paid based on their 1984 premiums or assessments. The tax collected under the provisions of this section shall be distributed and apportioned in the same manner as provided in section 148.380.