UPDATE 1-Ex-client of UBS gets house arrest for tax fraud

* Defendant credited with cooperating in UBS tax probe

* First UBS client sentenced after U.S. probe of bank (Adds details, background)

MIAMI, Oct 28 - A former client of UBS AG who cooperated in a U.S. probe of the Swiss bank's ties with wealthy Americans hiding money overseas was sentenced to one year of home detention and fined on Wednesday for a multimillion-dollar tax evasion scheme.

Steven Michael Rubinstein, 55, was the first former customer of UBS to be sentenced for tax fraud following a protracted U.S. legal battle with the bank that ended in August with an agreement to crack open Switzerland's long tradition of bank secrecy.

Rubinstein, a Florida accountant who pleaded guilty to a single count of tax evasion in June, was sentenced to a total of three years of probation including 12 months of house arrest. He was also ordered to pay a $40,000 fine.

UBS settled a sweeping U.S. criminal probe earlier this year by paying a $780 million penalty and admitting it helped U.S. citizens evade taxes.

It then ended a related civil suit in August by agreeing to turn over the names of 4,450 wealthy U.S. clients with undisclosed offshore accounts.

Rubinstein's sentence, handed down by a federal court judge in Miami, was in line with the Justice Department's recent request for leniency for Rubinstein due to what it described as his substantial cooperation in a probe centering on Americans with undisclosed offshore accounts at UBS.