PARIS—French Prime Minister Michel Barnier faces a pivotal no-confidence vote Wednesday that risks toppling his government and derailing France’s efforts to get its public finances back on track. Barnier’s government,

Wednesday’s vote follows fierce opposition from both left-wing and far-right parties to Prime Minister Michel Barnier’s proposed budget.

The French government is barreling toward a collapse that would plunge the country into political chaos and could have economic ripple effects in Europe.