The present study aims to examine whether the impact of institutional quality determinants such as Governance, rule of law, corruption, and other determinants such as trade, market size, economic growth, lagged FDI inflows on FDI inflows differ for High Income Countries (HICs), Upper Middle Income Countries (UMICs), Lower Middle Income Countries (LMICs) and Low Income Countries (LICs). Also this study reveals what is the significance of institutional quality relative to other determinants of the FDI inflows for HICs, UMICs, LMICs and LICs. Ordinary Least Square Method and Instrumental Variables Method were used for the period from 2009 to 2019. An average institutional quality variable has been created to using rule of law and control of corruption, which are governance indicators to measure institutional quality. The findings showed that institutional quality, market size, lag FDI variables are positive and significant for HICs, UMICs and LICs but not significant for LMICs. Economic growth (GDPpcg) and lag FDI variables are positive and significant in for LMICs. The finding of the current study was that the determination of institutions on FDI inflows are more higher than trade and market size in LICs. Also the determination of institutions on FDI inflows are more higher than market size in HIC and UMICs.