<![CDATA[Purpose – This research investigates an integrated framework examining how love of money as an antecedent and idealism as a direct factor and moderator shape ethical perceptions of tax avoidance and investment decision making within the Theory of Planned Behavior. Tax avoidance creates a dilemma between legal compliance and moral considerations, while investment decisions are driven by personal values and financial materialism. Methods – A quantitative, cross sectional explanatory research design was deployed. Primary data were collected through survey questionnaires from 272 Accounting and Economics students in South Kalimantan, Indonesia, and analyzed using Moderated Regression Analysis (MRA). Findings – All hypotheses were supported. Idealism influences ethical perceptions of tax avoidance (β = 0,159, p < 0,05) and investment decision making behavior (β = 0,209, p < 0,001), while love of money increases permissive tax avoidance attitudes (β = 0,200, p < 0,05) and opportunistic investments (β = 0,155, p < 0,001). Idealism moderates the relationship between ethical tax perceptions and investment behavior (β = 0,008, p < 0.001); although the interaction effect is small, it remains statistically significant. Research implications – This research provides practical insights for tax authorities, accounting educators, and financial institutions. Policymakers can integrate ethical values into compliance programs, educators can emphasize ethical reasoning and financial materialism, and investment institutions can encourage responsible investment decisions. Originality – This paper offers a multidisciplinary model bridging fiscal ethics and behavioral finance. It provides empirical evidence that intrinsic moral philosophies can counterbalance financial materialism. Future research should target active investors using longitudinal tracking.]]>
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