Swiss banking giant UBS has urged a Paris appeals court to turn down a US$1.4 billion bail looming over the allegations that it aided wealthy French customers avoid tax.

Judges requested the payment in July saying it reflects the size of the fine UBS could pay if it is found guilty.

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The Swiss bank was put under formal investigation on suspicion of laundering proceeds from the alleged tax evasion.

UBS lawyer Denis Chemla argued that bail demand was "without legal basis" and disputed the method of calculation.

The court said it would decide on the appeal on 22 September 2014.

UBS had already paid EUR2.875 million guarantee in the case.

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UBS is under investigation for allegedly encouraging tax evasion between 2004 and 2012 and has already been fined EUR10 million by French financial regulators for control failures that could have allowed clients to avoid taxes.

The bank is also the subject of investigations in Germany and Belgium.