The Volcker Rule will cost U.S. national banks as much as $4.3 billion to implement, according to a study by the Office of the Comptroller of the Currency.

The regulator estimates implementation costs between $413 million and $4.3 billion for banks it supervises, the OCC said in a report released today. Most of the potential costs come from the rule's curbs on certain holdings, such as in portfolios of some collateralized debt obligations. The agency also said affected banks will mostly be those with more than $10 billion in assets and could include as many as seven community banks.

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