Austrians rue starting fashion for Swiss franc mortgages

* Swiss franc surge swells mortgage debt in euro

* Repayment vehicles often lack returns to repay loans

* Nearly a fifth of loans to households in foreign currency

By Michael Shields and Angelika Gruber

VIENNA, Feb 1 (Reuters) - The surging Swiss franc has dealt a double blow to homeowners in Austria, home of the trend for borrowing in the Swiss currency that has devastated mortgage holders across eastern Europe.

In the early 1990s, people living in the west of the country who crossed into Switzerland to work were lured by the ultra low interest rates offered in the safe-haven currency.

The idea then spread, crossing a fundamental red line that was barely perceptible at the time: the new borrowers were not earning Swiss francs but euros.

Foreign-currency loans now account for nearly a fifth of household debt in Austria, even though regulators effectively banned them in 2008 for fear of a looming crisis. Around 150,000 families still owe around 29 billion euros of Swiss franc debt, with 4 percent of loans due within a year.

Banks' loan books could take a hit if defaults rise. Austrians are relatively wealthy and have benefited from rises in property prices, but poorly performing insurance policies sold alongside many mortgages present an added twist.

From loans to Austrians, it was a short step for Austrian banks to start selling Swiss franc-denominated mortgages through the large networks they set up in Poland, Hungary and Romania after communism fell in 1989.

Ratings agency Fitch said four big banks - Erste, Raiffeisen Bank International (RBI), Bank Austria and Volksbanken - held 30 billion euros of Swiss franc loans on their books in central and eastern Europe.

Back home, it was not relative inexperience of the financial services industry but proximity to it that caused the biggest trouble; mortgages were often linked to investment schemes designed to repay the loans at maturity.

"You often had a wealth adviser in your circle of acquaintances or family, and then you fell into their hands," said Peter Kolba of consumer advocate agency VKI.

These fee-hungry consultants often advised people to borrow twice as much as they actually needed to buy a home, and to invest the rest to finance the loan repayment.

One woman facing a 50,000 euro loss on her loan package, 20,000 of it since the Swiss central bank suddenly abandoned its cap on the franc on Jan. 15, said it was easy to be taken in.

"It looks so great when the financial advisers show you how much cheaper it is," she said, asking not to be named. "I wasn't aware (of the risk), but admit to a certain amount of naiveté."