This study aims to examine the partial and simultaneous effects of motivation, work discipline, and education level on teacher performance at Persatuan Perguruan Tamansiswa Sukadamai, Asahan Regency. This research employed a quantitative correlational design. The population consisted of 64 teachers, and a census (total sampling) technique was used, meaning all population members were involved as respondents. Data were collected through a structured questionnaire and analyzed using multiple linear regression with SPSS. The results of the t-test show that motivation has a positive and significant effect on teacher performance (t = 2.620 > 2.000, p = 0.011), work discipline has a positive and significant effect (t = 3.676 > 2.000, p = 0.001), and education level also has a positive and significant effect (t = 8.163 > 2.000, p = 0.000). The F-test results indicate that motivation, work discipline, and education level simultaneously have a significant effect on teacher performance (F = 205.461 > 2.76, p = 0.000). The Adjusted R Square value of 0.907 indicates that 90.7% of teacher performance is explained by these variables, while the remaining 9.3% is influenced by other factors. The novelty of this study lies in the integrated analysis of motivation, work discipline, and education level within a single empirical model in the context of a Tamansiswa-based school, providing stronger localized evidence compared to previous studies that generally examined these variables separately.
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