European Central Bank policymaker Pierre Wunsch pushed back on October 8 against proposals to increase charges on commercial banks. He warned that such moves could hurt the credibility of future operations. Wunsch said, "Honestly, the reasoning here is not very clear, or convincing, to me," regarding the higher reserve ratio.

FRANKFURT, Oct 8 (Reuters) - European Central Bank policymaker Pierre Wunsch pushed back on a proposal to increase charges ​on commercial banks, warning that it could hurt the credibility of future ‌central bank operations and might even cross into the realm of fiscal policy.

ECB policymakers are now debating whether to require banks to hold more of their excess liquidity in an unremunerated ​account, partly to reduce the ECB's own financial losses and partly ​to tighten financing conditions at a time of high inflation.

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"There are ⁠now 'ongoing discussions' about applying a higher minimum required reserve ratio – the MRR ratio – ​while of course keeping required reserves unremunerated," Wunsch, Belgium's central bank chief, told ​a conference in Brussels. "Honestly, the reasoning here is not very clear, or convincing, to me."

The ECB created trillions of euros of excess liquidity via bond buys in the pre-pandemic decade when ​rates were at or below zero, and it must now pay a hefty ​interest charge to commercial banks when they deposit this cash back at the bank.

This has ‌pushed ⁠up financial losses, especially at Germany's Bundesbank, which has stopped paying a dividend into the government budget and may not have cash for such dividends until the next decade.

"If the goal is to limit our losses, the MRR ratio would ​become a quasi-fiscal instrument," ​Wunsch said. "And fiscal ⁠policy is typically not a role allocated to the central bank."

Wunsch said that if banks are now taxed more heavily ​on this income, they may not be keen to take ​part in ⁠a future bond purchase scheme and this could then hurt the credibility of a central bank operation.

Minimum reserve charges have come into focus this year as the ⁠ECB is ​raising interest rates to combat high inflation. ​This is also raising national central banks' interest expense, as there are still over €2.1 trillion of excess ​liquidity in the financial system.

Reporting by Balazs Koranyi Editing by Gareth Jones and Louise Heavens