The objective of this study was to examine how variablesss from Technology Acceptance Model (TAM) play a role in determining the use of digital interfaces for internal communication in public service institutions. The researchers also examined the most preferred digital interface for internal communication among employees of public service institutions as well as the relationship between internal communication and public service delivery. A total of 385 respondents working in a public service institution took part in the study. The questionnaire was the instrument for data collection. To analyse the results, the researcher used both descriptive and inferential statistics. The result showed that perceived ease of use, perceived usefulness and attitudes to digital interfaces significantly correlate actual use. It was also found that social media was the most preferred digital interface for internal communication among employees of public service institutions. Our result also suggested a significant association between effective internal communication and public service delivery. The theoretical, scholarly and practical implications of the results have been explored.