When Lew says Social Security is "entirely self-financing," he refers to the trust funds that have built up assets of more than $2.5 trillion over the years. That’s what the rest of the government has borrowed and spent on other things. Those trust funds and the future interest payments will keep benefits funded at promised levels for years to come, it’s true. But unless the government raises taxes or cuts other spending substantially, the government will need to borrow more from the public to finance its obligations to the trust funds.
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