1Social Insurance Taxes consist mainly of payroll taxes, which are primarily taxes for Social Security (called Old-Age, Survivors, and Disability Insurance, or OASDI) and Medicare's Hospital Insurance (HI). A small share of social insurance tax revenues comes from unemployment insurance taxes and contributions to other federal retirement programs.
2Nearly all excise taxes fall into 5 major categories: highway, airport, telephone, alcohol, and tobacco taxes. Almost half of all excise receipts are earmarked by law to The Highway Trust Fund and they come primarily from taxes on gasoline and diesel fuel.
3Income support includes unemployment compensation, supplemental security income, earned income and child tax credits, food stamps, family support, child nutrition, and foster care.
4Net interest includes interest paid on Treasury securities and other interest that the government pays (for example, on late refunds issued by the Internal Revenue Service) minus interest that the government collects from various sources (such as commercial banks, where Treasury tax and loan accounts are maintained.) Net interest is determined by the size and composition of the government's debt, annual budget deficits or surpluses, and market interest rates.
5Offsetting receipts include Medicare premiums and employers' share of employee retirement, as well as federal pension programs, receipts from auctions and leasing, usert fees, etc. However, the largest amounts are from Medicare premiums and employers' share of employee retirement.
6The standardized budget excludes deposit insurance, receipts from auctions of licenses to use the electromagnetic spectrum and timing adjustments.
7These numbers do not agree with those published by the U.S. Bureau of Public Debt. This is because the Bureau of Public Debt reports the face value of all debt outstanding. However, some of the bonds sold have interest rates that are indexed to inflation. Therefore, the Congressional Budget Office adjusts the public debt annually to reflect the current market value.
8These numbers only are from the U.S. Bureau of Public Debt as they are not published by the Congressional Budget Office.
9These numbers do not agree with those published by the U.S. Bureau of Economic Analysis. I could find no one who could explain the difference.
Source: Congressional Budget Office
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