Previous studies have shown that the participation of first-generation immigrants in the Swedish income security system deviates from that of the native population. However, so far there has been no research that has focused on this issue where second-generation immigrants are concerned. This study shows that the rates of participation in different parts of the income security system vary considerably between different groups of second-generation immigrants. Second-generation immigrants whose parents come from Western Europe have low participa-tion rates in all the studied parts of the income security system. Their participation rates are even lower than for natives with both parents born in Sweden. Second-generation immigrants with parents from southern Europe and from outside Europe, on the other hand, have very high participation rates in especi-ally social assistance. The differences between the groups are of course to a great extent explained by differences in their labour market situation. According to the findings of the study, there are reasons to be concerned about the future labour market integration of second-generation immigrants with parents of non-European origin.