The bar chart presented on the National Debt Awareness Center home page is based on U.S. Senate Appropriations Bills and the Monthly Treasury Statement.

These data were published by the U. S. Treasury Department in a spreadsheet and generate the bar chart from that spreadsheet.

The "estimate bar" in the "Debt Total" box for the next Fiscal Year (FY) is generated by analysis of information published by the Congressional Budget Office and several other sources.

Health and Human Services spending includes Medicare and Medicaid spending, which is sometimes reported separately.