Negative yields. Political risk. The Fed. Now add the U.S. deficit to the list of worries to keep beleaguered bond investors up at night.

Since peaking at $1.4 trillion in 2009, the budget deficit has plunged amid government spending cuts and a rebound in tax receipts. But now, America’s borrowing needs are rising once again as a lackluster economy slows revenue growth to a six-year low, data compiled by FTN Financial show. That in turn will pressure the U.S. to sell more Treasuries to bridge the funding gap.

No one predicts an immediate jump in issuance, or a surge in bond yields. But just about everyone agrees that without drastic changes to America’s finances, the government will have to ramp up its borrowing in a big way in the years to come. After a $96 billion increase in the deficit this fiscal year, the U.S. will go deeper and deeper into the red to pay for Social Security and Medicare, projections from the Congressional Budget Office show. The public debt burden could swell by almost $10 trillion in the coming decade as a result.

All the extra supply may ultimately push up Treasury yields and expose holders to losses. And it may come when the Federal Reserve starts to unwind its own holdings -- the biggest source of demand since the financial crisis.

“It’s looking like we are at the end of the line,” when it comes to declining issuance of debt that matures in more than a year, said Michael Cloherty, head of U.S. interest-rate strategy at RBC Capital Markets, one of 23 dealers that bid at Treasury debt auctions. “We have deficits that are going to run higher, and at some point, a Fed that will start allowing its Treasury securities to mature.”

After the U.S. borrowed heavily in the wake of the financial crisis to bail out the banks and revive the economy, net issuance of Treasuries has steadily declined as budget shortfalls narrowed. In the year that ended September, the government sold $560 billion of Treasuries on a net basis, the least since 2007, data compiled by Bloomberg show.

Coupled with increased buying from the Fed, foreign central banks and investors seeking low-risk assets, yields on Treasuries have tumbled even as the overall size of the market ballooned to $13.4 trillion. For the 10-year note, yields hit a record 1.318 percent this month. They were 1.58 percent today. Before the crisis erupted, investors demanded more than 4 percent.

One reason the U.S. may ultimately have to boost borrowing is paltry revenue growth, said Jim Vogel, FTN’s head of interest-rate strategy.

With the economy forecast to grow only about 2 percent a year for the foreseeable future as Americans save more and spend less, there just won’t enough tax revenue to cover the burgeoning costs of programs for the elderly and poor. Those funding issues will ultimately supersede worries about Fed policy, regardless of who ends up in the White House come January.

As a percentage of the gross domestic product, revenue will remain flat in the coming decade as spending rises, CBO forecasts show. That will increase the deficit from 2.9 percent this fiscal year to almost 5 percent by 2026.

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