Millennials aged 25 to 40 are currently the largest consumer group. Their dynamic lifestyles and social demands make them highly consumptive. The ease of obtaining credit, such as loans and credit cards, through advances in financial technology (FinTech) has further accelerated this trend. Unfortunately, exposure to social media that portrays a consumptive lifestyle encourages many of them to follow trends and buy non-essential items. The lack of financial literacy among young Indonesians often makes them unaware of the consequences of debt, which ultimately erodes the financial independence that is so badly needed in this era. This study aims to prove the relationship between Financial Technology, Lifestyle, and Self-Control that influence Debt Behavior. In addition, it is seen that men and women have different levels of self-control, and this is input for researchers to add gender as a moderating variable in their research. The research method used is a mixed method, more precisely a Sequential Explanatory Design, in which quantitative data is collected and analyzed, then combined with qualitative data to explain or enhance quantitative findings. Primary data was collected through questionnaires and interviews with experts, while secondary data was collected from articles and other reference data. The population used was the community in the city of Jakarta. The sample was collected using accidental sampling techniques, and the statistical test tool used Structural Equation Modeling (SEM) with SmartPLS software.