One of the goals of the Islamic Republic of Iran is to reduce the prevalence of catastrophic health expenditures among Iranian households to 1% by the end of the sixth 5-year development plan (2016-2021). This study was conducted to evaluate the level of access to this goal in the final year of this program. A national cross-sectional study was conducted on 2000 Iranian households in five provinces of Iran in 2021. Data were collected through interviews using the World Health Survey questionnaire. Data from households whose health care costs were more than 40% of their capacity to pay were included in the group of households with catastrophic health expanditure (CHE). Determinants of CHE were identified using univariate and multivariate regression analysis. 8.3% of households had experienced CHE. The variables of being a female head of household (odd ratio [OR] = 2.7), use of inpatient (OR = 1.82), dental (OR = 3.09), and rehabilitation services (OR = 6.12), families with disabled members (OR = 2.03) and low economic status of the households (OR = 10.73) were significantly associated with increased odds of facing CHE (p < 0.05). In the final year of the sixth 5-year development plan, Iran has not yet achieved its goal of "reducing the percentage of households exposed to CHE to 1%." Policymakers should pay attention to factors increasing the odds of facing CHE in designing interventions.