The low level of financial literacy among Indonesian society, which according to the 2022 National Survey of Financial Literacy and Inclusion (SNLIK) only reached 49.68%, poses a challenge for the millennial generation in managing their finances, amid the ease of digital transaction access that may encourage consumptive behavior. This study aims to analyze the influence of financial literacy, income, and lifestyle on the financial planning behavior of the millennial generation in Medan City. This study uses a quantitative associative approach with data collected from 99 millennial respondents in Medan City through purposive sampling technique. Data analysis was conducted using the Partial Least Square (PLS) method with SmartPLS 4 software. The results show that financial literacy, income, and lifestyle all have a positive and significant effect on financial planning behavior, with financial literacy as the most dominant factor. Simultaneously, the three variables are able to explain 67.1% of the variance in the financial planning behavior of the millennial generation in Medan City. These findings confirm that improving financial literacy is the key factor in encouraging more directed financial planning behavior among the millennial generation.
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