National Health Insurance Act Article 21

In case the income of the insured in Categories 1 and 2, as prescribed in the preceding article, is adjusted between February and July of the current year, the group insurance applicants shall notify the Insurer the adjusted insured payroll-related amount by the end of August of the same year, or notify the Insurer by the end of February of the following year if the adjustment is made between August of the current year and January of the following year, which shall become effective on the first day of the following month after notification.Unless the insured payroll-related amount, as prescribed in the preceding paragraph, has reached the highest level of this Insurance, such amount shall not be lower than the monthly labor pension reserve deposit or the insured salary of other social insurance schemes to which the insured subscribes. In case the insured payroll-related amount of this Insurance is lower, the group insurance applicant shall at the same time notify the Insurer to adjust accordingly, or the Insurer may also make adjustments at its own discretion.