If a company has too much debt and too little income, it's going to struggle to pay its bills, regardless of when its bonds come due.

This is a lesson that investors are learning as distressed U.S. bonds suffer their worst performance since 2008. The notes have plunged 7.5 percent so far this year and 3.2 percent this month alone, with some of the biggest losers being the debt of Lightstream Resources Ltd., Peabody Energy Corp., and Cliffs Natural Resources Inc., according to Bank of America Merill Lynch index data.

It's a painful wake-up call for investors who've gotten used to high-yield debt being synonymous with big returns in an era of unprecedented Federal Reserve stimulus. Even as companies have pushed back debt maturities and lowered interest expenses, that doesn't mean they can continue to work magic in the face of a slowing world economy and oil prices that have fallen 51 percent since the 2014 peak.

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"It seems to us that focusing too much on the maturity wall is probably unhelpful" for determining when corporate defaults will spike up, wrote Ara Lovitt, who manages the GMO Credit Opportunities Fund, a distressed-debt hedge fund at GMO LLC, in a report this month. "Based on the experience of the last three credit cycles, there seem to have been much larger forces at work."

Indeed, the speculative-grade default rate has already begun ticking up from historically low levels, even though most existing corporate bonds don't have to be repaid for another four years or more. Take American Eagle Energy Company, which filed for bankruptcy after missing the first coupon on a bond it issued just seven months earlier.

The corporation is "a recent winner of the credit market's version of the NCAA (as in 'No Coupon At All')," Lovitt wrote.

Standard & Poor's calculates the energy and natural resources default rate at 6.9 percent for the past 12 months, from 4 percent six months earlier, and UBS AG analysts expect the rate to accelerate.

"How high will energy default rates go?" UBS analysts Matthew Mish and Stephen Caprio wrote in a July 9 report. "We have been very consistent on this question: 10 to 15 percent by mid-2016."

 

Growing Pool of Distressed Bonds

The pool of distressed U.S. corporate bonds, typically those yielding more than 10 percentage points above benchmarks, has swelled to $127 billion, from the low last year of $43.7 billion, Bank of America Merrill Lynch index data show. This month alone, Peabody Energy's $4.8 billion of bonds have fallen 14.9 percent, while Cliffs Natural Resources's $2.5 billion of notes have declined 14.6 percent.

The most-indebted companies are generally more vulnerable to hiccups, such as oil prices that have fallen to about $52 a barrel from as high as $61.82 last month.

The International Monetary Fund this month downgraded its forecast for global growth, and China's facing a roller coaster in its stock market, as economists forecast its slowest annual expansion since 1990.

There's a reason the highest-yielding U.S. bonds are called distressed.

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