Enforcement Rules of the Labor Pension Act Article 33-1

Where a worker has elected to receive a monthly pension, the worker may, within thirty days from the date on which the first monthly pension payment is deposited into their account, apply to change to a lump-sum pension payment; such change shall be limited to one time only.Where an application for such change under the preceding paragraph is approved by the Bureau of Labor Insurance, the Bureau shall, based on the principal and accrued dividends already contributed to the individual pension account at the time the monthly pension was originally approved, issue the difference in a lump sum after deducting the amount already disbursed.
中文原文 勞工退休金條例施行細則第33-1條
勞工選擇請領月退休金者,於月退休金首次撥付入帳之日起三十日內,得申請變更為請領一次退休金,並以一次為限。
前項變更申請,經勞保局核定者,勞保局應依原核定月退休金時已提繳入專戶之本金及累積收益,扣除已撥付入帳之金額後,一次補發其差額。

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