A study examined the effects of the Targeted Jobs Tax Credit (TJTC) program on the employment and earnings of disadvantaged persons. Three outcomes--average quarterly wages, average number of quarters employed, and average wages during employed quarters--were studied for various categories of disadvantaged persons (economically disadvantaged youth, ex-offenders, and Vietnam-era veterans; handicapped persons who had completed rehabilitation; general assistance recipients; and Social Security Disability Insurance recipients). TJTC vouchering and certification were examined separately. More TJTC-vouchered and -certified individuals became employed, but their wages were relatively lower than in the comparison group. Of the targeted groups analyzed, only the handicapped group had consistently positive impacts for both vouchering and certification. Certified individuals tended to have more turnover than did their noncertified counterparts. The econometric technique used to correct for selectivity in the vouchering study suggests that white males who are vouchered tend to be the least employable whereas "creaming" is evident for white females and nonwhites. (An appendix documents the files used and processing steps taken to produce the final analysis files for the TJTC evaluation.) (MN)