By Margit Feher

BUDAPEST--Hungary's competition authority Wednesday levied its highest ever fine in a cartel case against the country's largest banks, saying they had discouraged home owners with a foreign-currency mortgage from taking part in a program aimed at reducing their loans.

GVH said it had used emails and the banks' internal documents to establish that the banks had coordinated their actions between September 2011 and January 2012 to deter mortgage borrowers' participation in a scheme that was aimed at lowering the burdens of home-owners with foreign-currency loans.

Under the scheme, borrowers could pay back their foreign-currency mortgage in full and at a discounted exchange rate favorable for them. Banks were to book the arising losses.

GVH fined 11 Hungarian banks a total of 9.49 billion forints ($43.1 million), with the largest amount--HUF3.92 billion--being levied on the country's biggest lender OTP Bank Nyrt. (OTP.BU). OTP said the fine is unfounded and will take legal action.

The local units of Austria's Erste Group Bank AG (EBS.VI), Belgium's KBC Bank (KBC.BT) and Italy's Intesa Sanpaolo SpA (ISP.MI) were fined HUF1.73 billion, HUF983.3 million and HUF835.4 million, respectively. Erste Bank said "its strategy related to final loan repayments was not aligned with other banks, no business secrets were shared and no overall plan was agreed with other banks."

It fined MKB Bank Zrt.--the Hungarian unit of Germany's Bayerische Landesbank AG--HUF783 million. Budapest Bank Zrt., a unit of U.S. banking group GE Money Bank, was fined HUF283.5 million and Raiffeisen Bank Zrt., an arm of Raiffeisen International AG (RBI.VI) of Austria, was hit with a HUF583.6 million charge. The local arm of UniCredit SpA (UCG.MI) was fined HUF306.3 million.

Citibank Zrt., a unit of Citigroup (C) and partly state-owned savings cooperative Magyar Takarekszovetkezeti Bank Zrt. and UCB Ingatlanhitel Zrt. were also fined.

Foreign-currency mortgages were popular in Hungary before the debt crisis, when they were cheaper than borrowing in the local currency. The government has been trying to establish schemes to lower those borrowers' burdens since their debt payments have sometimes doubled due to the weakening of the forint.

Write to Margit Feher at margit.feher@wsj.com

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