The swingeing 75% tax rate has been approved by the high court in France.
A year ago, the proposal for this tax was judged unconstitutional by the Constitutional Court, ruling that 66% was the highest individuals should pay.
The government than altered the plan and made employers liable for the 75% tax on salaries more than €1 million. So it is the companies which will now pay the levy.
The rate is to stay in place for at least two years and apply to income derived in 2013 and in 2014.
Although polls indicate that a large majority of individuals in France favour the temporary tax, loud voices from business, football clubs, and rich individuals have protested.
The movie star Gerard Depardieu even abandoned France and gained Russian citizenship in protest.
France is attempting to slash its huge public deficit by focussing more on higher taxes while also making some cuts in spending.
