BEIJING--China's shadow banking sector had an estimated 31.2 trillion yuan ($5.03 trillion) in assets outstanding at the end of 2013, and bad loans amounted to 4.4% of the total, consulting firm Oliver Wyman said.

But the consulting firm said the bad loan total outside the conventional banking sector was manageable as it is unlikely to pose a systemic risk to the financial system.

"The shadow banking sector [in China] has grown fast and risks are rising," said Christian Edelman, head of corporate and institutional banking and wealth management practices at Oliver Wyman, a unit of Marsh & McLennan Cos. "But many doomsday scenarios you hear these days are overplayed."

China's shadow banking sector--a mixture of traditional banks' off-book lending arms, trust companies and other informal lenders--raised concerns about whether slowing economic growth would trigger a debt crisis.

Economists worry that shadow lenders are introducing risks reminiscent of the U.S. subprime mortgage boom by funding projects that may never pay off, often by failing to disclose fully what they are asking investors to fund.

Oliver Wyman calculated the size of the shadow banking sector after eliminating possible double counting and funds not used as credits in the financial system. China's shadow banking sector is equivalent to about 50% of the nation's gross domestic product, which is comparatively low based on global standards, Mr. Edelman said.

As a large chunk of shadow banking business is intertwined with the banking business, about 22% to 44% of current bad loans from the shadow banking sector could end up on the books of the traditional banking sector, though that would add a manageable 4.3 percentage points to the overall bank nonperforming loan ratio, according to Oliver Wyman.

At the end of last year, the nonperforming loan ratio of China's commercial banks was 1.29%, much lower when compared with many advanced economies.

The bad loan ratio for China's shadow banking sector could rise to 10% if economic growth slips to 7% or lower, the consulting firm said.

The nation's property slump will also add to risks in the financial sector, but generally those risks are controllable, said Mr. Edelman.

Oliver Wyman estimated that China's mortgage indebtedness accounts for less than 10% of the value of household ownership of real estate.

"Even if the property market were to go down some 20%, ...which would be an extreme scenario, it wouldn't lead to a full-blown mortgage crisis as you've seen in other markets," Mr. Edelman said.

Write to Grace Zhu at Grace.Zhu@dowjones.com

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