The aim of this paper is to investigate a potential disparity between actual service experience and clients’ service quality expectations (Gap 5) among FDI clients in Uganda and how this impacts FDI inflows to the Ugandan economy.  A double-column research instrument was used to source 215 FDI clients’ perceptions of investment service quality in this study. The pilot tests indicated that the instrument had good internal consistency with all Cronbach’s alpha reliability coefficients greater than 0.8 for both expected and actual service perceptions. For the phenomenological part, two focus groups each comprising between six and ten participants was assembled for FDI clients.  Structural equations modelling (SEM) was used to test the theory through confirmatory factor analysis (CFA) and goodness-of-fit tests. The CFA established that the hypothetical model used did not meet the required minimum specifications. The goodness-of-fit tests established that the researchers’ model did not fit its sub-sample data. The paired samples t-test indicated that Gap 5 existed among FDI clients in Uganda. Qualitative findings too indicated that gap 5 existed among the DFI clients. The paper provided Government of Uganda´s investment officials with knowledge on service quality perceptions of their FDI clients and the strategies to close clients’ Gap 5