(WSJ) Tumbling interest rates in Europe leaves some banks owing money on loans to borrowers

Tumbling interest rates in Europe have put some banks in an inconceivable position: owing money on loans to borrowers.

At least one Spanish bank, Bankinter SA, the country’s seventh-largest lender by market value, has been paying some customers interest on mortgages by deducting that amount from the principal the borrower owes.

The problem is just one of many challenges caused by interest rates falling below zero, known as a negative interest rate. All over Europe, banks are being compelled to rebuild computer programs, update legal documents and redo spreadsheets to account for negative rates.

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