(a) Except as provided by Subsection (b), the rate of the tax imposed by this chapter on an insurer is 1.75 percent of the insurer’s taxable gross premiums received during a calendar year.
(b) The rate of the tax imposed by this chapter on an insurer that receives taxable gross premiums from the business of life insurance is:
(1) 0.875 percent of the first $450,000 of taxable gross premiums received during a calendar year from the business of life insurance; and
(2) 1.75 percent of the remaining taxable gross premiums received during that calendar year from the business of life insurance.

(c) The rate of the tax imposed by this chapter on a health maintenance organization is:
(1) 0.875 percent of the first $450,000 of taxable gross revenues received during a calendar year for the issuance of health maintenance certificates or contracts; and
(2) 1.75 percent of the remaining taxable gross revenues received during that calendar year for the issuance of health maintenance certificates or contracts.