Social Insurance Taxes Now Account for 34 percent of All Revenues
Social insurance taxes, which fund programs such as Social Security and Medicare, are now the second-largest source of revenue. Yet without reforms, dramatically higher taxes will be needed to pay for these programs.
Type of Taxes as a Percentage of Total Federal Revenue, 2007
Source: Rates from Congressional Budget Office’s Budget and Economic Outlook: Fiscal Years 2008 to 2018