Greece will soon table an out-of-court deal for loans worth billions of euros in Swiss francs to end a years-long dispute linked to increased cost payments from currency fluctuations, Reuters reports.

According to the agency, more than 50,000 Greeks took out mortgage loans denominated in Swiss francs in the mid-2000s, opting for the currency because of its lower interest rates. However, the appreciation of the Swiss franc against the euro led to a sharp increase in monthly repayments.

In Greece, many borrowers turned to the courts seeking compensation, with final rulings still pending.

The scheme will provide for the favorable conversion of remaining Swiss-franc loan balances into euros, with a discount ranging from 15% to 50% on the exchange rate, depending on borrowers’ income.

The total cost to Greek banks is expected to range between €400 million and €600 million, depending on the number of loans issued and borrower participation, the government official and another banking sector source said, without providing further details. The plan will be voluntary.

Finally, according to data from the Ministry of Finance, of the approximately 37,000 Swiss-franc loans still outstanding, around 20,000 are held by banks, while about 17,000 are non-performing loans managed by credit servicing companies or securitized under the so-called “Hercules” non-performing loan reduction scheme.