勞工退休金條例於民國94年7月1日正式施行。此制度最重要的特色為個人帳戶之確定提撥制度。企業退休金採行確定提撥模式，國外經驗多以信託模式運作，與我國強制勞工提撥儲蓄、配合保證收益規範之單一基金集體運作制度有所不同。 國外退休基金運作過程，主管機關多針對受託人、受委託之基金經理人、資產保管者等人之「忠實義務」加以規範。強調以忠實義務條款，將忠實義務人處理事務之方法標準化，以保障勞工大眾權益。但我國勞工退休金條例第四十二條條文內容，並未針對其所謂「管理人忠誠義務」作實質內容規範，同時在違反效果部份也附之闕如。 本研究以忠實義務之起源「信託關係」開始討論，進一步介紹英、美、香港信託法及退休金法中，相關忠實義務之實質內容與違反效果，並從「忠誠義務、謹慎投資注意義務、與授權義務」三方面探討忠實義務之相關規範。 最後本研究建議勞工退休金條例第四十二條應充實相關實質內容與違反效果，將管理退休基金之各忠實義務者行為標準化，同時建議我國未來基金經營架構可朝信託模式邁進，以金融機構或雇主為受託人，輔以成立補償基金或受託人購買專業彌償責任保險的方式，將企業退休金制度回歸自由經營本質，而政府權位則提升至監管機制。

82年台灣已邁入「高齡化」的社會型態，到了96年底時老年人口占人口比例達10.2％。另根據台閩地區2007年簡易生命表台灣男性平均餘命為75.46歲，女性為81.72歲，平均78.38歲，因應台灣進入高齡化及少子女化社會，如何讓勞工安享在60歲以後平均有18多年無工作收入的老年生活，已成為當前最重要問題。 為落實老年照護制度，增進勞工退休權益，陸續完成了勞工退休金條例、國民年金法及勞工保險條例修法之工作，其中將於98年1月1日實施勞工保險老年給付年金制，考量勞工保險已實施50多年，許多資深勞工已符合或將符合老年給付條件，且國人多具「入袋為安」之傳統觀念，在兼顧勞工權益及制度穩定之原則下，採現制一次給付與年金制併行方式，賦予現有被保險人於退職時選擇請領現制或新制之權利。 藉由本研究的撰寫，針對勞工保險老年給付選制行為三大變數，模擬試算出各種組合變數下的理性選擇建議，讓即將辦理退休的勞工能夠更明確更瞭解兩種給付的不同，並做正確的選擇，以確保退休生活品質。 本研究建議增加勞工保險老年給付選制及國民年金給付條件，做為將來修法的參考。 / Abstract In 1993, Taiwan entered the state of aging society. By the end of 2007, the elderly population above the age of 65 years accounted for 10.2% of the total population. The 2007 life table of the Taiwan-Fukien Area gave the life expectancy of 75.46 years for males and 81.72 years for females, averaging 78.36 years for both sexes. How to assure the laborers to live happily in their old age for an average of 18 some more years after retirement without job and incomes in an aged and fewer-children society has become an important issue. To realize the care system for the elderly, and to improve the rights and interests of the laborers after retirement, work has been done to enact the Labor Pension Act and the National Pension Act, and amend the Labor Insurance Act. The Labor Insurance Old-Age Pension system will be implemented in January 2009. The Labor Insurance has been in operation for more than 50 years. Many elderly laborers are eligible to or about to be eligible to the old-age payment. In line with the traditional concept of “safer to have cash in pocket”, and taking in mind the rights and interests of the laborers and the stability of the system, the old-age pension system will have concurrently either the “one-time payment under the current system” and the “monthly pension” system in practice. The retirees will have the choice of either the current system or the new system. The present study uses three variables in the choice of the old-age pension system to simulate the ideal choice and make recommendations under various combinations of variables to help laborers about to retire correctly understand the pros and cons of the two different payment systems and thus to make correct choice, and to assure the quality of their retirement life. The study recommends that, for the future amendments of regulations, more alternative systems for choice for old-age payment and more conditions for the national pension system be made available. Key words: Labor Insurance, National Pension, Labor Pension Act, Labor Standards Act

退休金的會計處理原本即具複雜性，加上最近退休金制度的變革，形成退休金會計獨特且豐富的情境背景，提供了許多的研究機會。本論文包含三個與退休金會計相關之議題；其中第一個議題是「勞工退休金新制之股價效應」；第二個議題是「退休金精算假設選用之誘因」；第三個議題是「退休金精算假設選用之價值攸關性」。三個議題均以效率市場假說為基礎，針對勞工退休金新制之實施與退休金精算假設之選用，分別深入探討其與股價之關聯性。 首先，本論文第一個議題探討勞退新制之股價效應。事件日股票報酬與公司特質的關聯分析，雖然部分的實證結果不顯著，然而部分的證據顯示，勞退新制公布實施時，公司股票報酬與退休金提撥不足程度、員工平均服務年資、退休金提撥率、退休金成率等公司特質具有關聯性，隱含資本市場在某種程度上，似乎可以依據勞退新制對公司不同之衝擊程度，反映於公司股票報酬。 其次，本論文第二個議題探討退休金精算假設選用之誘因。實證的結果顯示，我國上市上櫃公司精算假設選用的橫斷面差異，可能源於債務契約、提撥不足之成本以及損益平穩化等誘因。最後，本論文第三個議題探討退休金精算假設選用之價值攸關性。實證結果顯示，退休金精算假設選用具價值攸關性，投資人對公司選用精算假設保守程度有所評價，對於裁量性 (隱藏的) 預計給付義務亦有所反映，似乎適當地根據精算假設選用對於預計給付義務之影響幅度來調整對公司之評價，隱含資本市場並未功能性固著於報導的退休金義務。 / There are three essays in this dissertation. The first essay examines the impact on equity prices of the Promulgation of Labor Pension Act. Evidence reported in the paper shows that negative abnormal returns are most pronounced for firms with large underfunded level of pension plan, firms with little average years of employment, firms with low contribution ratio, and firms with low pension cost ratio. The second essay explains the cross-sectional variation in firms’ selected actuarial assumptions (rate of increase in compensation and discount rate) used to measure the projected benefit obligation (PBO). Evidence shows that firms with relatively larger debt ratio, larger underfunded level of pension plan, and larger decline in earnings tend to select more aggressive (obligation-reducing) estimation parameters. The last essay studies the association between actuarial assumptions and firm value. The results indicate that firm value is lower, conditional on the reported PBO, for firms that use higher discount rates and lower rate of increase in compensation. This is consistent with investors seeing through managers’ opportunistic choices of obligation reducing assumptions. The evidence suggests that the stock market does not fixate on reported PBO numbers, but properly appreciates the value relevance of the discretionary component of the PBO.