UPDATE 1-Bank of China posts strongest profit growth in a year
* Q3 net profit 34.8 bln yuan, f'cast 32.7 bln yuan
* Q3 net interest margin 2.12 pct vs 2.1 pct in H1
* NPL ratio at 0.93 pct vs 0.94 pct at end-June
HONG KONG, Oct 25 (Reuters) - Bank of China Ltd, the country's No.4 lender by market value, posted its biggest quarterly profit gain in a year, beating estimates, as interest margins widened following increased demand for credit.
Net profit rose to 34.76 billion yuan ($5.57 billion) in July-September from 29.8 billion yuan a year earlier. That compares with the average estimate of 32.7 billion yuan in a Reuters poll of 12 analysts.
Net interest margin, which measures loan profitability, widened to 2.12 percent at the end of September from 2.1 percent at the end of June.
The wider interest margin indicates Chinese banks are benefiting from the central bank's decision in June to give lenders more flexibility in setting their own rates by raising the ceiling on deposit rates and lowering the floor on lending rates.
The policy shift initially fuelled concerns that interest margins would be hit.
Bank of China is the first of the so-called "Big Four" Chinese banks to report earnings for the third quarter, and its wider margins set a strong tone for its peers.
Bank of China's total loan book expanded about 9 percent in January-September, pointing to rapid loan growth in the third quarter. In the first half, its loan book grew only 6.5 percent.
While increased demand for loans has boosted net interest margins, overall earnings growth remains constrained by new regulations implemented by regulators that restrict the kind of fees banks can charge.
For many years, Chinese consumers were charged for services that are free in most other markets, such as changing an Internet banking password and withdrawing cash from ATMs outside their home city. Banks dropped those fees this year.
Fees and commission income, which fuelled much of Bank of China's earnings growth in the past two years, remained flat in the third quarter from a year earlier at about 17 billion yuan.
That compares with the 14 percent growth it recorded in 2011.
Widening worries about bad loans lurking in China's banking system have also dimmed the outlook of lenders.
Goldman Sachs analysts estimate that the actual system-wide non-performing loan ratio may be about six times higher than the official reported rate of 0.9 percent.
Bank of China said its non-performing loan ratio stood at 0.93 percent at the end of September, down from 0.94 percent at the end of June. However, overall non-performing loans rose to 64.1 billion yuan from 63.6 billion yuan at the end of June.
Bank of China's Hong Kong-listed shares are up about 10 percent so far this year, lagging the 14 percent rise on the benchmark Hang Seng index.
The stock rose 1 percent to close at HK$3.15 on Thursday, before the earnings announcement.
Industrial and Commercial Bank of China Ltd, Agricultural Bank of China Ltd and China Construction Bank Corp will report earnings through Oct. 30. (Reporting by Kelvin Soh; Editing by Ryan Woo)
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