Young adults are at high risk of experiencing economic abuse—a form of intimate partner violence (IPV)—and Chinese young adults in non-marital cohabitation are especially vulnerable. To reduce economic abuse, an important question to answer is: What factors are associated with economic abuse? After controlling for constructs (e.g., demographic information and other types of IPV) that were linked to economic abuse, we investigated how financial behaviors (i.e., individuals’ money management capability) were associated with power (im)balance (i.e., whether individuals shared equal influence with the romantic partner) and, in turn, economic abuse among non-marital cohabitating Chinese young adults. We also investigated whether associations among financial behaviors, power (im)balance, and economic abuse varied across young adults’ gender and SES. We used a Qualtrics survey to collect data from 445 non-marital cohabitating Chinese young adults (53.3% male vs. 46.7% female; 22.7% lower socioeconomic status [SES] vs. 77.3% higher-SES). A structural equation model was conducted to test the associations of research interests. We found that money management capability (e.g., spending within budget and tracking expenses) is associated with balanced power—the individual sharing equal influence with the partner in the decision-making process—and, in turn, less experience of being economically abused. These associations were statistically equivalent across gender and SES. Collectively, our findings suggested that promoting money management capability be a timely and new avenue for reducing economic abuse among Chinese young adults in non-marital cohabitation, possibly because this population faces common and severe economic abuse but generally lacks the opportunity to learn money management.