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The case study in this research was conducted at PT Tri Jaya Teknik Karawang with research data per semester in 2012-2016 period. The phenomenon in this company is the unstable of company profit in each semester, which causes the selling price every year, and causing debt that impact on working capital and sales volume, creating the unstable of its net profit. The purpose of this study is to determine whether the working capital and sales volume affects the net income either partially or simultaneously. This study has two independent variables, they are: Working Capital (X1) and Sales Volume (X2) and one dependent variable is Net Profit (Y). The method used in this research is quantitative method, with data analysis method using data normality test and classical assumption test. The data are using descriptive and verificative analysis. Based on the result of the research in t test (partial),means there is influence of Work Capital and Sales Volume to Net Income partially. It means simultaneously (F test) obtained significant value variable of Working Capital and Sales Volume is about 0.010 <0.05, it means simultaneously the influence of Working Capital and Sales Volume to Net Profit. The coefficient of determination test shows that Working Capital and Sales Volume have a strong influence on Net Profit that is equal to around 73,1% and the rest equal to around 26,9% influenced by the other variable outside of second variable which is studied.