The Effect of Additional Income, Work Discipline, and Motivation on Employee Performance in Mimika Regency Office

Purpose: This study aims to analyze the effects of Additional Employee Income (Tambahan Penghasilan Pegawai/TPP) and Work Discipline on Employee Performance, with Work Motivation as a mediating variable, among civil servants and honorary staff at the Tourism, Culture, Youth, and Sports Office (Dinas Pariwisata Kebudayaan Pemuda dan Olahraga) of Mimika Regency, Central Papua Province.

Research Methodology: A quantitative census survey was conducted on 51 employees of the Mimika Tourism Office using questionnaires and supporting data collection methods. All instruments were valid and reliable, and classical assumptions were met. Data were analyzed using path analysis (SPSS 26.0) with Sobel test for mediation.

Results: Substructure 1 shows that TPP and work discipline significantly and positively affect work motivation (R² = 0.436). Substructure 2 indicates that TPP, work discipline, and work motivation significantly influence employee performance, with a high explanatory power (R² = 0.923). Work motivation is the strongest predictor of performance. The Sobel test confirms partial mediation of work motivation in both relationships.

Conclusions: TPP, work discipline, and work motivation significantly and positively affect employee performance at the Mimika Tourism Office, with work motivation as the strongest predictor and a partial mediator. The model explains 92.3% of performance variance, indicating strong explanatory power.

Limitations: The study is limited to 51 respondents in a single office, uses a cross-sectional design, and relies on self-reported data.

Contributions: This research provides empirical evidence of the mediation pathway and supports motivation theories in a local government context, with implications for improving TPP and employee motivation policies.