A domestic or foreign insurance company, association, or society, other than life, or a surety or guaranty company, doing business in this State, shall pay a tax to the State, which is hereby assessed at the rate of two percent per annum on the gross amount of premiums and assessments written on its business in this State, but not including premiums received for reinsurance. A domestic or foreign life insurance company, doing business in this state, shall pay a tax to the State, which is hereby assessed at the rate of two percent per annum on the gross amount of premiums and assessments collected on its business in this State, but not including premiums received for reinsurance.