The overall landscape of personal income taxation (PIT) has changed rapidly in numerous post-communist countries of Central and Eastern Europe (CEE), with the adoption of a form of flat-rate tax. Although the economic consequences of this change have been studied extensively, little is known about public opinion on the topic in these countries. This article aims to shed some light on how public opinion addresses the issue of flat-rate PIT in Romania. Logistic regression analysis is used to assess the impact of self-interest, education, age, gender, ideology, political trust, social solidarity, and political knowledge on public support for flat-rate PIT, based on survey data (N = 1105) from the Romanian Election Study (RES). The results suggest that high-income earners, women, and those with higher levels of political trust are more likely to support flat-rate PIT, while higher levels of social solidarity and more education increase the chances of being reluctant about it. Furthermore, the analysis finds no evidence that age, ideology, or political knowledge have an influence on people’s fiscal preferences. The article’s findings provide lessons for policymakers on how fiscal preferences arise and may evolve in a post-communist context, particularly in relation to recurring societal crises.