Although federal deficits have shrunk markedly in recent years, under current law increased spending for Social Security and major health care programs, along with increasing interest costs, would cause debt to rise steadily over the long term.
The larger deficits would cause federal debt to grow faster than the economy. By 2040, CBO projects, debt would be more than 100 percent of GDP and continue on an upward path—a trend that cannot be sustained indefinitely.
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The 2015 Long-Term Budget Outlook in 25 Slides