How much does the U.S. government owe? The number that is subject to the recurrent debt-ceiling wrangling includes intra-government debts that the Treasury is imputed to owe to other Federal government operations. For example, Social Security taxes have historically exceeded benefits paid out. The surplus was used to pay for other government programs, and the Social Security Trust Fund was credited with corresponding holdings of U.S. Treasury securities representing the accumulated value of those surpluses. Many of us think of this as an I.O.U. that the government issued to itself. Economists usually subtract those intra-government debts when talking about the size of the federal debt, relying instead on the Treasury’s measure of debt held by the public. Although many of us have made use of the latter numbers in academic research, policy analysis, and lectures to our students, those data are also getting less reliable in recent years.
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