A Dissertation submitted in Fulfillment of the Requirements for the Award of the Degree of Master of Science in Economics (PPM) of Mzumbe University. 2013This study was based on the contibution of ownsources revenue collection to the implementation of development projects in Dar es salaam Municipal Councils (Ilala, Temeke and Kinondoni). Councils revenue collection and expenditure time series secondary data from 2003 to 2012 collected quarterly were used, where by Ordinary Least square method was used to estimate the model. Overall results by using F-test shows p(0.0000) and it is statistically significant by 1%, this implies ownsources revenue collections have an impact on implementation of development projects in Dar es salaam municipal councils. Despite of that significancy, still there was some variable which did not satisfy all conditions of significance. Variable like funds collected from sales of municipal properties did not show linear relationship to implementation of development projects, but all the remaining variables were statisticaly significant and linearly related to implementation of development projects in Dar es salaam municipal councils. These result will help decision makers to make appropriate policies and decision on how to emphasize and concetrate more on ownsources revenue collection. This also will help many Local Government Authorities to identify more sources of income which can rise their revenue and set a clear demarcation of some amount of funds to be spent for implementation of development projects, rather than spent on everyday expences (Recurrent expenditures). Key words: Ownsources revenue collection, Development projects, Dar es salaam Municipal Councils.