Here is the link:
http://www.reuters.com/article/2013/...94H0AX20130518
The 100% rate is due to a one time levy. Key quote:
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"The newspaper said that the exceptionally high level of taxation was due to a one-off levy last year on 2011 incomes for households with assets of more than 1.3 million euros ($1.67 million).
President Francois Hollande's Socialist government imposed the tax surcharge last year, shortly after taking office, to offset the impact of a rebate scheme created by its conservative predecessor to cap an individual's overall taxation at 50 percent of income."
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Got that? They are going back in time - financially speaking - to recoup rebates citizens received in previous years.