The Targeted Jobs Tax Credit (TJTC) is probably the most outstanding example of a generous entitlement program with a very low participation rate. Only about 10 percent of eligible youth hired are claimed as a tax credit by their employers. The causes of the low participation rates are analyzed by estimating a Poisson model of the number of TJTC-eligibles hired and certified during 1980, 1981, and 1982. Information costs, both fixed and variable, are found to be key barriers to TJTC participation. The cost- effectiveness of TJTC is low because of the stigma attached and the very high recruitment costs of hiring additional TJTC-eligibles. Because employers find it relatively cheap to certify after the fact eligible new employees who would have been hired anyway, this passive mode of participating in TJTC predominates.