Molly Dahl, Jonathan Schwabish, Thomas DeLeire, and Timothy Smeeding, Congressional Budget Office, March 2012. Expansions in the Earned Income Tax Credit (EITC) are associated with increases in formal employment and increases in long-term year-over-year growth in earnings for single mothers. In this study, researchers examine whether expansions in the EITC are likely to lead to increases in Social Security retirement benefits for less-educated women (those likely to be affected by the EITC) by increasing their employment and earnings when young.