The EU's executive arm saw growth in the euro zone's second-largest economy at just 0.4 percent next year - half the 0.8 percent assumed in the 2013 budget and held back largely by tax rises that will hurt consumer spending.
Labour Minister Michel Sapin said the government had faith in its targets and the European Union had not factored in the economic boost from company tax rebates and other measures to spur jobs and investment announced this week.
"The government is right to base itself today on the estimates we have set," Sapin told Reuters in an interview.
"The principle of the competitiveness pact is to drive a bit more investment and a bit more employment," he said of the package, which seeks to ease labour costs by granting companies 20 billion euros ($25.5 billion) in annual tax relief.
The Commission said France's budget deficit would fall to 3.5 percent of gross domestic product in 2013 from 4.5 percent this year, still above the 3 percent EU ceiling that President Francois Hollande has pledged to meet, and would only drop below it in 2014.