As Debt Rises, the Government Will Soon Spend More on Interest Than on Military
nytimes.com
nytimes.com
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[spoilers ahead] .
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... like who owns the debt and receives debt service payments. https://www.marketwatch.com/story/heres-who-owns-a-record-21...Almost third of the debt is intergovernmental holdings, another ten percent is owned by the Federal Reserve who makes profit payments to Treasury. So basically 40% of the debt is internal debt and interest payments go back to the the government.
https://definedterm.com/a/definition/4513 (gives same definition as your first source)
net interest: In the federal budget, net interest comprises the government’s interest payments on debt held by the public (as recorded in budget function 900), offset by interest income that the government receives on loans and cash balances and by earnings of the National Railroad Retirement Investment Trust.
https://definedterm.com/a/definition/4433
... Debt held by the public consists mainly of securities that the Treasury issues to raise cash in order to fund the operations and pay off the maturing liabilities of the federal government that tax revenues are insufficient to cover. Such debt is held by outside investors, including the Federal Reserve System. ...
Just like when you borrow from your 401(k). You're paying yourself interest back.