The long-term effects of employment during high school were analyzed by using National Longitudinal Survey of Youth data on 1,067 students who were initially interviewed in 1979 and who remained in the survey sample through 1991. Hours worked by respondents during the week prior to the survey date in their sophomore, junior, and senior years of high school were analyzed in relation to employment consequences 6-9 years after their scheduled data of graduation. A regression analysis was performed that controlled for standard demographic variables and potentially important characteristics (including respondent's school attitudes, smoking/drug use, religion, and family's ethnic/educational/income characteristics). No harmful effects of employment during high school were discovered; rather, students employed during their senior year earned 20% more annually and 10% higher hourly wages 6-9 years after high school graduation than did students not employed during high school. The favorable effects of low to moderate amounts of employment in the senior year persisted after controlling for a comprehensive set of background characteristics. Although the analysis does point to a negative relationship between senior year employment and educational attainment, the predicted effect is extremely small--working 20 hours per week was associated with a reduction in schooling of less than 2 months. (Fourteen tables and 43 references are included. Appended are three tables detailing sample characteristics and regression estimates.) (MN)