From a Paul Ryan report (pdf):


Austin Frakt applauds this chart because it gives interest on the debt its own category:

Using some set of assumptions ... interest on the debt will consume about as much of the federal budget as will all health care spending by 2040. By 2060, interest on the debt will be akin to another entire federal budget. By 2080 debt interest will be larger than the entire federal budget. Meanwhile, if future government revenue is no higher than it has ever been in the past, relative to GDP (~19%), we already cannot afford the government we have, let alone the interest payments on it.


The Economist, using CBO numbers, depicts the revenue gap Frakt mentions. 

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