A Dissertation Submitted in Partial Fulfillment of the Requirements for the Award of the Degree of Master of Public Administration (MPA)This study assessed transformation of social security funds from multiple to a unified social security fund with reference to Public Service Social Security Fund (PSSSP). It specifically examined the criteria for harmonization of multiple social security fund to a unified social security fund in Tanzania, assessed the effects of transformation from multiple to a unified social security fund to livelihood of retirees in Tanzania and the procedures for obtaining retirement benefits from multiple to a unified social security fund in Tanzania. The study deployed mixed research approach and multiple case study design in particular. A sample size of 150 respondents was selected through convenience and purposive sampling techniques and used in the study. Data were collected through interviews, questionnaires and documentary review methods. TheContent/ Thematic was employed for qualitative data analysis and Statistical Package for Social Science was deployed for quantitative data analysis. The findings of the study indicate that effects of transformation are satisfaction of employees’ serves, reduction of Social Security Fund operating cost, rise of employees’ morale, increase of the membership base, increase of contributions that boost the cash flow and individual income increase. The findings also indicateconfirmation of personal details, picking up retirement data, complete retirement application as well as timeline. Moreover the study findings indicate that there was an approval of members by Social Security Fundas they were required to submit all the required documentations per the forms issued by Social Security Fund, guarantee monthly deductions, duration of the loan will vary depending on the loan amount as well as does not require the pensioner to provide any tangible security. The study concludes that, apart from the benefits received by the pensioners and other beneficiaries, social security enhance socioeconomic development of the country through Corporate Social Responsibilities (CSR). The study recommends that, the government of Tanzania should reinforce measures to strengthen SocialSecurity Fund to enhance total adhesion to pension funds schemes for all workers in both formal and informal economic sectors.