MONTHLY STATEMENT OF THE PUBLIC DEBT OF THE UNITED STATES SEPTEMBER 30, 2006 (Details may not add to totals) TABLE I -- SUMMARY OF TREASURY SECURITIES OUTSTANDING, SEPTEMBER 30, 2006 (Millions of dollars) Amount Outstanding Title Debt Held Intragovernmental Totals By the Public Holdings Marketable: Bills....................................... 908,474 3,057 911,531 Notes....................................... 2,445,307 1,853 2,447,160 Bonds....................................... 534,473 237 534,710 Treasury Inflation-Protected Securities..... 395,550 89 395,638 Federal Financing Bank 1 ................. 0 14,000 14,000 Total Marketable a........................... 4,283,804 2 19,235 4,303,039 Nonmarketable: Domestic Series............................. 29,995 0 29,995 Foreign Series.............................. 2,986 0 2,986 R.E.A. Series............................... 1 0 1 State and Local Government Series........... 238,835 0 238,835 United States Savings Securities............ 203,656 0 203,656 Government Account Series................... 78,129 3,644,618 3,722,747 Other....................................... 5,715 0 5,715 Total Nonmarketable b........................ 559,317 3,644,618 4,203,935 Total Public Debt Outstanding................. 4,843,121 3,663,853 8,506,974 TABLE II -- STATUTORY DEBT LIMIT, SEPTEMBER 30, 2006 Amount Outstanding Debt Held Intragovernmental Totals By the Public 19 Holdings Debt Subject to Limit: 19 Public Debt Outstanding..................... 4,843,121 3,663,853 8,506,974 Less Amounts Not Subject to Limit: Other Debt Not Subject to Limit........... 506 0 506 Unamortized Discount 3................... 32,876 39,410 72,286 Federal Financing Bank 1 ............ 0 14,000 14,000 Total Public Debt Subject to Limit.......... 4,809,739 3,610,443 8,420,183 Other Debt Subject to Limit: Guaranteed Debt of Government Agencies 4 96 0 96 Total Public Debt Subject to Limit.......... 4,809,835 3,610,443 8,420,278 Statutory Debt Limit 5..................................................................... 8,965,000 Balance of Statutory Debt Limit............................................................. 544,722 COMPILED AND PUBLISHED BY THE BUREAU OF THE PUBLIC DEBT www.publicdebt.treas.gov