This study aims to analyze the partially and simultaneous influence of the work environment and institutional transparency on donor loyalty at Baitul Maal Hidayatullah (BMH) North Sumatra Representative Office. The research method utilized a quantitative approach with multiple linear regression analysis. The sample comprised 182 respondents who were active muzakki or donors at BMH North Sumatra. The research instrument met the criteria for validity and reliability, as well as passed classical assumption tests (normality, multicollinearity, and heteroscedasticity). The multiple linear regression equation obtained was Y = 4.829 + 0.146 X1 + 0.083 X2. The partial t-test results indicated that the work environment has a positive and significant effect on donor loyalty (tcount 2.157 ttable 1.973; p = 0.032 0.05). Similarly, institutional transparency partially exerts a positive and significant effect on donor loyalty (tcount 2.050 ttable 1.973; p = 0.042 0.05). The simultaneous F-test results confirmed that work environment and institutional transparency jointly exert a significant effect on donor loyalty (Fcount 4.352 Ftable 3.05; p = 0.014 0.05) with a coefficient of determination (R2) of 0.046 (4.6%). In conclusion, continuously improving the quality of the work environment/amil service and enhancing the transparency of financial reports and programs serve as vital strategies in strengthening donor loyalty and retention at BMH North Sumatra.
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