<![CDATA[This study aims to analyze the effect of overconfidence bias and accounting understanding on the quality of investment decision-making among MSME owners in Tumpang District, Malang Regency, both partially and simultaneously. A quantitative causal-associative approach was used, with a sample of 100 respondents determined through the Slovin formula and purposive sampling from a population of 12,856 registered MSMEs. Data were collected using a Likert-scale questionnaire and analyzed using multiple linear regression with SPSS 27. The results show that overconfidence bias and accounting understanding each have a positive and significant effect on the quality of investment decision-making, both partially (t = 3.220, sig = 0.002; t = 3.507, sig < 0.001) and simultaneously (F = 15.706, sig = 0.000), contributing 22.9% to the variation in the dependent variable. These findings indicate that both a high level of confidence and good accounting understanding play an important role in improving the quality of investment decisions made by MSME owners, and that MSME development programs should combine psychological guidance with practical accounting training.]]>
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