How premiums are calculated and collected for foreign professionals, as well as their dependents?

The premiums for wage-earners, the insured of category 1 are based on their monthly salary basis, for employers and self-employed owners of professional business are their profitable income regarding to the payroll bracket table, and reported by their group insurance applicant. The formula of premiums: 【Insured amount X insurance premium rate X contribution ratio X (1+number of dependents)】Premium will be withheld from employee’s paycheck then be transferred to the National Health Insurance Administration (NHIA). The premium for those dependents are same as the insured and shall pay by the insured.