After Austrian Finance Minister Michael Spindelegger expressing shock at the extent of the financial troubles of Austrian bank Hypo Alpe Adria on Monday, an expert said Tuesday the bank may need 12.47 billion dollars more.

One of Spindelegger's primary concerns was an increase in the Maastricht deficit, which could increase by up to 1.2 percent in 2014 and take the Austrian budget deficit to 5.5 billion dollars, the Finance Minister not ruling out that taxpayers could be required to pay in part for.

President of the Fiscal Advisory Council Bernhard Felderer told the OE1 Mittagsjournal that settling the Hypo Alpe Adria case could cost 12.47 billion dollars, including 6.65 billion dollars the bank has already received.

He believes the remainder of the costs will come from non-performing loans, something that will be covered by the expected additional 5.5 billion euro budget deficit for the year. In addition he believes the government-targeted zero structural deficit is not under threat despite the massive sums of money the bank will require, and said other funds injected into the bank have not gone to waste.

Further debate among the country's politicians as to who should foot the bill for the troubled bank continues, with Chancellor Werner Faymann saying the bank's home state of Carinthia must certainly "also contribute."

Mayor of Vienna Michael Haupl however said Tuesday he did not believe taxpayers should have to pay, saying those who caused the problems and those who profited should be made to pay.