Bernard Arnault, the boss of luxury goods group LVMH and France's richest man, has attacked a proposed two per cent tax on billionaires as an assault on France's economy and denounced the plan's architect as a far-left ideologue.

The tax, which would target wealth above 100 million euros ($A177 million), has gained political traction in France, where Prime Minister Sebastien Lecornu faces pressure from the Socialist Party to include it in the 2026 budget or face a confidence vote that could topple his government.

"This is clearly not a technical or economic debate, but rather a clearly stated desire to destroy the French economy," Arnault told Britain's Sunday Times.

He accused the plan's architect, economist Gabriel Zucman, of being "first and foremost a far-left activist" who uses "ps

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