Whether what business impact of outsourcing will be caused? Nowadays, IT outsourcing was clearly a part of an effective management strategy that the companies felt IT outsourcing strategy can bring to achieve positive results. Information technology outsourcing providing servicers will be predicted to provide services that is expected to raise over the next five years minimum. The companies demand clients expected benefits of IT outsourcing and determined that cost reduction, increased operation, efficiency and improved IT effectiveness. What are the impacts of outsourcing to influence better long-term improvement in the business performance? It is impossible to being benefits of significant reduction and lower growth in sellings, general and administrative expense to IT outsourcing company demand clients. Also, pre-existing corporate cultures are focused on business improvement to IT outsourcing company demand clietns. In the past researches, some economists indicated that points can be used to reflect the actual numbers increase or decrease in percent. However, their prior researches shows that prior to outsourcing, the annual growth in selling, general and administration expenses of eompanies in the study was already 4.2 points lower than sector medium. Moreover, within one to two years after IT outsourcing these companies improved even most. Annual growth in selling and general administrative expenses for them was 9.9 points lower efford to assist any IT outsourcing will have selling and administrative expenses for long term. Also, almost two-third of the companies studied outperformed in increased growth in return on asset two to three years after IT outsourcing commenced. Prior to outsourcing, the annual ROA growth rate for companies in the study ws 7.5 points lower than the sector median. After outsourcing, however these companies experienced 8.6 points higher median a substantial change of 16.1 points. Also, nearly two to third of the companies studied grew earnings faster than their peers. Two to three years after IT outsourcing, companies experienced an annual rate of growth in earnings 11.8 points higher than the growth rate of the sector median. Thus, it seems IT outsourcing can assist the IT outsourcing demand clients to reduce expenditure and to raise income both as the same time. Then, it will cause these questions to IT outsourcing demand clients. Is outsourcing influencing in an economic downturn to finance sector in the short term? Is the finance sector's renewed change for outsourcing just a temporary cost-cutting measure? Will today's economic climate initiate long term financial and productivity gains? Whether what are benefits and disadvantages of outsourcing finance sector IT. I shall demonstrate why outsourcing open source software support and maintenance can be a good choice to start. Firstly when company plans to budget cuts expenditures, IT outsourcing is often the first choice. For example in 2003 year, Zurich Financial services' sprawling IT department consisted of more than 7,500 employees. After posting a record loss of 3.4 billion the year before, Zurich decided to cut down on in those staff and outsource nearly half of its IT work. Outsourcing has successfully cut costs by 45 percent and cut the number of in house IT staff by 60 percent. Here are some of the benefits that companies enjoy when they outsource information technology functions to competent, reliable vendors.