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Of course it was borrowed. Every (!) SS surplus has been borrowed by Congress, with no real plan to repay it.
In case anyone doesn't know what that means in dollar terms...I happen to have actual fiscal 2003 numbers on my desk:
"the deficit" as reported was $375 billion. But there was an off-budget surplus, mostly from SS, of $161 billion. That means that the on-budget deficit was $536 billion. That means that for regular operations of the federal government, it spent $536 billion more than it took in.
It's unfortunate that these numbers are kind of difficult to find, and unfortunate that the press doesn't report them when the government issues its statements about the deficit.
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BTW, when the 42nd president said "the budget deficit is zero", he was ignoring the borrowed SS surplus that was used to "balance" the budget.
I'm not quite sure why you would zero in on that. There were surpluses, even to the point that the operating budget was balanced or at least close to it.