National Pension Act Article 10

The insurance premium rate for the Insurance shall be 6.5% for the first year of the implementation of this Act. The rate shall be increased by 0.5% in the third year and another increase of 0.5% for every 2 years thereafter until it reaches the limit of 12%. However, no increase shall be implemented if the balance of the insurance fund is enough to pay for the insurance payment for the next 20 years.
中文原文 國民年金法第10條
本保險之保險費率,於本法施行第一年為百分之六點五;於第三年調高百分之零點五,以後每二年調高百分之零點五至上限百分之十二。
但保險基金餘額足以支付未來二十年保險給付時,不予調高。

English translation for reference only; the Chinese text prevails. Not legal advice.