The digitalization of public administration is increasingly moving forward. This systematic literature review analyzes existing studies that focus on the impacts of digitization projects (n=93). From a bibliometric point of view, it can be seen that so far only a few authors have published several times on this topic. Most studies focusing on impact come from the US or China and are mostly related to computer science. In terms of content, the majority of the articles examined focus on services to citizens, and therefore also take them into consideration when measuring impact. The classification of the investigated effects in dimensions of public value shows that most studies focus on the analysis of utilitarian-instrumental value, such as efficiency or performance. Our results show that greater interdisciplinary cooperation is needed when researching the impact of digitalization in the public sector. Here, the different dimensions of impact should be linked more closely. In addition, research should also focus more intensely on the effects of digitalization within the administration.