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The purpose of this study is to analyze the effect of Gross Regional Domestic Product (GRDP), Consumer Price Index and Medan City Deposit Interest Rate on Deposit Amounts at PT Bank Sumut Medan Coordinating Branch. The scope of this research is to focus on analyzing the factors that affect the Deposit Amount in PT Bank Sumut Medan Coordinator for the period 1998 to 2016. The analysis model used in this study is the basic model of multiple linear regression equations using the VAR method, in estimate the short-term and long-term relationship between the variables Gross Regional Domestic Product (GRDP), Consumer Price Index (CPI) and the Interest Rate of Medan City Deposit with Total Deposit at PT Bank Sumut Medan Coordinating Branch. The result of the interpretation of the VAR model, in general, obtained the most substantial VAR value is the Economic Growth variable while the smallest VAR value is the variable Growth of Deposits. Based on the results of the Impulse Response Function (IRF) test the most significant influence on deposit growth both in the short term and in the long term is the Consumer Price Index variable. Then the results of the Forecast Error Decomposition of Variance (FEDV) test showed that the most significant impact of error variance in both the short and long term which had the most impact was the Economic Growth variable.