The ruling was the first involving a famous name in the so-called Swissleaks scandal, in which a former HSBC employee gave authorities thousands of names of suspected tax evaders. Other trials are expected to follow.
A Paris court convicted Arlette Ricci, 73, granddaughter of designer Nina Ricci, of tax evasion and money laundering and sentenced her to three years in prison, with two of them suspended. The court ordered a 1 million euro (USD 1.1 million) fine and the confiscation of two properties worth 4 million euros.
In a separate part of the case, the court ordered Ricci, a lawyer and two companies to pay millions in back taxes for the period of 2007-2009. The court did not set the amount of the back tax payment, saying that would be worked out at a later date.
Arlette Ricci's daughter, Margot Vignat, 51, was also convicted and given an 8-month suspended sentence. In addition to the other fines, Vignat and Ricci were ordered to pay 100,000 euros in damages to the French government.
Last week, French authorities placed London-based HSBC under formal criminal investigation over alleged tax fraud by its Swiss private bank. The bank said the claim was "without legal basis.