President Barack Obama may lose the advantage of low borrowing costs as the U.S. Treasury Department says what it pays to service the national debt is poised to triple amid record budget deficits.

Interest expense will rise to 3.1 percent of gross domestic product by 2016, from 1.3 percent in 2010 with the government forecast to run cumulative deficits of more than $4 trillion through the end of 2015.

While some of the lowest borrowing costs on record have helped the economy recover from its worst financial crisis since the Great Depression, bond yields are now rising as growth resumes. Net interest expense will triple to an all-time high of $554 billion in 2015 from $185 billion in 2010, according to the Obama administration’s adjusted 2011 budget.

“It’s a slow train wreck coming and we all know it’s going to happen,” said Bret Barker, an interest-rate analyst at Los Angeles-based TCW Group Inc., which manages about $115 billion in assets. “It’s just a question of whether we want to deal with it. There are huge structural changes that have to go on with this economy.”

The amount of marketable U.S. government debt outstanding has risen to $8.96 trillion from $5.8 trillion at the end of 2008, according to the Treasury Department. Debt-service costs will climb to 82 percent of the $757 billion shortfall projected for 2016 from about 12 percent in last year’s deficit, according to the budget projections.

Budget Proposal

That compares with 69 percent for Portugal, whose bonds have plummeted on speculation it may need to be bailed out by the European Union and International Monetary Fund.
Forecasts of higher interest expenses raises the pressure on Obama to plan for trimming the deficit. The President, who has called for a five-year freeze on discretionary spending other than national security, sent Congress a $3.7 trillion budget today that projects the federal deficit will exceed $1 trillion for the fourth consecutive year in 2012 before falling to more “sustainable” levels by the middle of the decade.

“If government debt and deficits were actually to grow at the pace envisioned, the economic and financial effects would be severe,” Federal Reserve Chairman Ben S. Bernanke told the House Budget Committee Feb. 9. “Sustained high rates of government borrowing would both drain funds away from private investment and increase our debt to foreigners, with adverse long-run effects on U.S. output, incomes, and standards of living.”

Yield Forecasts

Treasuries lost 2.67 percent last quarter, even after reinvested interest, and are down 1.54 percent this year, Bank of America Merrill Lynch index data show. Yields rose last week to an average of 2.19 percent for all maturities from 2010’s low of 1.30 percent on Nov. 4.

The yield on benchmark 10-year Treasury note will climb to 4.25 by the end of the second quarter of 2012, from 3.63 percent last week, according to the median estimate of 51 economists and strategists surveyed by Bloomberg News. The rate was 3.61 percent at 10:48 a.m. today in New York. The economy will grow 3.2 percent in 2011, the fastest pace since 2004, according to another poll.

“People are starting to come to the conclusion that you’ve got a self-sustaining recovery going on here,” said Thomas Girard who helps manage $133 billion in fixed income at New York Life Investment Management in New York. “When interest rates start to go back up because of the normal business cycle, debt service costs have the potential to just skyrocket. Every day that we don’t address this in a meaningful way it gets more and more dangerous.”

‘Demonstrates Confidence’

The U.S. needs to manage its spending decisions “in a way that demonstrates confidence to investors so we can bring down our long-term fiscal deficits, because if we don’t do that, it’s going to hurt future growth,” Treasury Secretary Timothy F. Geithner said in Washington on Feb. 9.

The Treasury Borrowing Advisory Committee, which includes representatives from firms ranging from Goldman Sachs Group Inc. to Soros Fund Management LLC, expressed concern in the Feb. 1 report that the U.S. is exposing itself to the risk that demand erodes unless it cultivates more domestic demand.

“A more diversified debt holder base would prepare the Treasury for a potential decline in foreign participation,” the report said.

Foreign investors held 49.7 percent of the $8.75 trillion of public Treasury debt outstanding as of November, down from as high as 55.7 percent in April 2008 after the collapse of Bear Stearns Cos., according to Treasury data.

Deficit Forecasts

The deficit for the current fiscal year is forecast to hit a record $1.6 trillion — 10.9 percent of gross domestic product — up from the $1.4 trillion the administration estimated previously. It would be $1.1 trillion in 2012, 7 percent of GDP. By 2015 it would decline to $607 billion, or 3.2 percent of GDP.

About $4.5 trillion, or 63 percent of the $7.2 trillion in public Treasury coupon debt, needs to be refinanced by 2016. That gives the government a narrowing window as growing interest expense will curtail its ability to spend.
 
“There is roll-over risk,” said James Caron, head of U.S. interest-rate strategy at Morgan Stanley in New York, one of 20 primary dealers that trade with the Fed. “It’s a vicious cycle.” (Source: Bloomberg).