By Lingling Wei 

BEIJING--By moving to insure bank deposits at home, China's leadership has its eyes abroad.

China on Tuesday detailed a plan to launch a bank deposit-insurance system in May, a long-awaited move that is aimed at better disciplining its lenders and their customers. Deposit insurance is seen as a prelude to freeing up government-controlled interest rates on bank deposits--a step China's Central Bank Gov. Zhou Xiaochuan has said could be taken as soon as this year.

Under the plan released Tuesday by the State Council, China's cabinet, up to 500,000 yuan ($80,550) in deposits made by businesses and individuals per bank will be insured. China currently has more than 122 trillion yuan ($19.654 trillion) in bank deposits, among the world's largest totals. More than 99% of depositors would be covered by the program, according to central bank officials, which will start May 1 and will be backed by a fund run by the central bank.

The plan has little detail on how banks would be charged to fund the insurance program, though central-bank officials say all banks would be required to pay a fee according to the size of their deposit bases and risk profiles.

China has plenty of domestic reasons to insure bank deposits, a long-established scheme in many Western countries, including the U.S. But the move also comes as China seeks a greater international role for its currency, the yuan. The Chinese leadership is gunning for the International Monetary Fund to declare the yuan an official reserve currency later this year, like the U.S. dollar, the euro and the Japanese yen. A designation from the IMF could help China's effort to elevate the yuan's role in international trade and finance, as Beijing increasingly seeks to challenge Washington on the world stage.

To get there, China would need to relax its controls on interest rates, Chinese officials and economists say. Bank deposit-insurance is a key step in that direction.

The IMF bid is being used as "a goal post to catalyze domestic financial-sector reforms, especially interest-rate liberalization and China's capital-account opening," said China economist Tao Wang at UBS.

China has traditionally kept a tight grip on its financial system. That has limited the surges of money in and out of the country that has bedeviled other economies, but it makes the yuan less appealing as a tradable currency because its moves don't fully follow market dynamics.

A market-based rate system is seen as crucial to preparing China's financial markets for an eventual opening up of cross-border capital flows. Two years ago, China removed controls on lending rates. It has also moved in recent years to widen the band within which the yuan can be traded on a daily basis. Chinese officials proposed a draft plan to launch deposit insurance in December.

Meanwhile, the yuan's global use has been rising. More than one-fifth of China's total trade is now settled in the yuan, compared with only 2.3% in 2010, according to data from UBS AG.

For years, banks and the investing public in the world's second-largest economy have been operating on the assumption that the government would bail them out in times of crisis. Setting up a deposit-insurance system suggests that Beijing is pressing ahead on its pledge to give the market a bigger role in deciding winners and losers.

Deposit insurance frees up banks to compete for depositors' money without risking the savings of their customers, potentially challenging China's biggest banks for deposits and introducing more market-based principles into the system. Currently, banks in China can offer up to 3.25% on one-year deposits.

The move also represents a nod by China's policy makers to worries over financial risks in China as soured loans in the country's banking system continue to rise. China's economic growth has slowed to its slowest pace in more than two decades, and local government and state-run companies are still burdened with debt from a post-2008 lending binge.

The insurance system is aimed at "preventing and resolving financial risks in a timely manner," according to the State Council plan.

Deposit insurance is expected to pave the way for another, more difficult reform: freeing up government-controlled interest rates on bank deposits. Many Chinese officials and analysts warn that Beijing might be inclined to put off that move if the economy weakens further. Liberating deposit rates could drive up companies' funding costs, at least in the near term.

China's banking regulators have expressed concerns that relaxing deposit rates too fast could lead Chinese banks to compete for funds, pushing up their costs and leading them to make risky loans that would end up badly, according to officials with knowledge of the matter.

"Slower economic growth and interest-rate liberalization are among the factors that are curbing our profit growth," Jiang Jianqing, chairman of Industrial & Commercial Bank of China Ltd., China's largest bank by assets, told reporters last week.

To help relieve banks' funding pressure, the central bank is expected to free up more funds for banks to lend by lowering the amount of reserves they have to set aside with the central bank, according to banking officials and analysts.

Liyan Qi contributed to this article.

Write to Lingling Wei at lingling.wei@wsj.com

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