Intragovernmental holdings

National debt of the United States
  Intragovernmental holdings
  Debt held by the public

In public finance, intragovernmental holdings (also known as intragovernmental debt or intragovernmental obligations) are debt obligations that a government owes to its own agencies. These agencies may receive or spend money unevenly throughout the year, or receive it for payout at a future date, as in the case of a pension fund. Lending the excess funds to the government, typically on the accounts of its treasury, enables the government to calculate its net cash requirements over time.