The implementation of Treasury Single Account (TSA) policy in 2015 by the current administration purposely or consciously with the intention to control financial leakages and mismanagement of public funds, tackle corruption and to detect fraud as well as to improve government revenue collection and economic growth. The study analyzed the impacts of Treasury Single Account on the Nigeria Economy, Though, specifically examined the efficient way in which the adoption of the TSA policy is effective in improving the economy of Nigeria, with a view to find out if it is capable of developing the country's Gross Domestic Product (GDP). The study, therefore, consist of Ministries, Departments and Agencies (MDAs) in the public services, while, the population of the study consisted of 100 staffs of the four MDAs, the sample size of 80 staffs were selected using the proportionate random sampling technique. A structured and validated questionnaire was used for data collection. The findings of the study showed that, TSA has significant impact on the growth and development of the economy. Considering this fact in mind, it is recommended that, government should remove all administrative and bureaucratic bottle neck involve in accessing funds meant for economic growth in connection to TSA policy, and the Central Bank of Nigeria (CBN) should embark upon intensive sensitization campaign on the importance of TSA policy on the economy