In this file photo taken on Aug 3, 2020, a HSBC logo is pictured on a wall outside a branch of the bank in central London. (DANIEL LEAL / AFP)

SINGAPORE – Asia-focused lenders HSBC, Standard Chartered and their Southeast Asian peers such as DBS are set to report an improvement in second-quarter net interest income, a key source of revenue, benefiting from higher interest rates.

But analysts warn that rising credit impairments and weak financial markets could weigh on banks' performance as the macro environment deteriorates.

Analysts warn that rising credit impairments and weak financial markets could weigh on banks' performance as the macro environment deteriorates

Singapore banks are expected to report 10 basis points net interest margin expansion on a quarter-to-quarter basis, the highest over the last eight quarters, outperforming Asian peers, according to JPMorgan analyst Harsh Wardhan Modi.

"We are seeing the highest pace of rate hikes in the shortest span of time in at least 20 years," he said.

"My sense is that not only will second quarter numbers meet our expectations but guidance from managements will reaffirm much better net interest margin outlook for the second half of the year."

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United Overseas Bank, the smallest-listed Singapore lender, unveils results this Friday, followed by Overseas-Chinese Banking Corp on Aug 3, and DBS a day later.

Singapore's central bank tightened its monetary policy this month, saying the action would slow inflation. It expects the city-state's growth to come in at the lower half of the 3-5 percent forecast range for 2022.

Morgan Stanley analysts said their earnings estimates upgrades for Singapore banks were mainly due to higher net interest income, driven by faster than expected rate hikes.

"However, higher net interest income estimates are offset by lower non-interest income estimates, as we expect headwinds for fee income and trading income to remain for a while," the analysts said.

Refinitiv data shows analysts on average expect OCBC's Q2 net profit to rise by 10 percent from a year ago, UOB's to rise by 9 percent, while DBS' profit is set to ease by 1 percent.

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London-listed HSBC and StanChart, both of which make the bulk of their revenue in Asia, are set to report strong underlying net interest income on rising interest rates but impairments and higher costs are likely to be a big drag on results.

European banks are set to show their weak spots when they update investors on how their business has fared this year.

Credit Suisse analysts said in a note that the strength in net interest income at HSBC would be offset by weaker wealth revenue and lower capital ratios in the quarter.

HSBC is expected to post a 22 percent fall in pre-tax profit to $3.98 billion in the second quarter, based on consensus analyst estimates compiled by the bank. It reports results on Aug 1.

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StanChart, which unveils its numbers this Friday, is expected to report statutory pre-tax profit of $989 million, down 14 percent on the year, according to consensus analyst estimates compiled by the bank.

In India, HDFC Bank , the country's largest private lender, kicked off banks' results with a 19 percent rise in quarterly net profit as provisions for bad loans dropped and loan growth picked up. But the results came below market estimates.