By William Horobin

PARIS--Renault SA on Tuesday reported a steep rise in profits in the first half of the year after booking provisions over the same period last year and as the French car maker ramped up cost cutting.

Net profit rose to 749 million euros ($1 billion) from 39 million euros in the first half of last year, when Renault booked provisions against the disruption of Iranian sales.

The French car maker swung to a 464 million euro operating profit in the first half from a 249 million euro loss over the same period the previous year thanks to a cost-cutting plan that began a year ago.

"Margin improvement comes above all from managing costs," said Dominique Thormann, Renault's chief financial officer. The largest share of cost-cutting came from lower purchasing costs, followed by logistics and research and development, he said.

The company is also starting to see the benefits of cutting jobs in France under labor agreements signed last year, Mr. Thormann said.

The rise in profitability came despite a 3% fall in revenue to 19.82 billion euro as a stronger than expected improvement in European sales failed to offset a slide in emerging markets.

"Trends in the group's key markets were contrasted," the company said in a statement.

The company confirmed its outlook for an increase in car registrations and revenue this year, excluding the impact of changes in foreign-exchange rates. Renault said it also expects to improve operating profit in its automotive division.

Write to William Horobin at willam.horobin@wsj.com

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