The federal tax system provides little incentive for participation in tax-preferred saving plans to households that most need to save more for retirement and whose contributions would most likely represent an actual increase in savings. By contrast, the tax code provides its strongest incentives to those who already are generally better prepared for retirement and who are more likely to use tax-preferred vehicles as a shelter than as an opportunity to increase overall saving. The saver's credit, helps correct this "upside-down" structure of tax incentives for retirement saving.