Although economic pressure and family stress models have been examined with samples of men and women in first marriages, previous models have neglected to focus on men and women in stepfamilies and to examine stress sources unique to stepfamilies. This study examines the effect of economic pressure on both common stressors and stepfamily-specific stressors and the subsequent effects on negativity, positivity, and marital quality. Results of structural equation modeling with a sample of 490 men and women in stepfamilies indicate that the proposed stepfamily stress model fit the data well for both men and women. For women, stepfamily-specific stressors have a direct inverse effect on positivity, negativity, and marital quality. For men, stepfamily-specific stressors were predictive of both positivity and marital quality. Findings from the study advance previous research on economic pressure, family stress, and marital quality. (Contains 1 table and 2 figures.)