The project - known as Leap 4.5 - will scrutinise almost every area of spending at Britain's luxury car manufacturer, The Sunday Times reported.
The £3-billion-a-year capital budget, focused on research and development and new plants, will be spared.
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It has spent around £11 billion on a new range of cars, built plants in China and India, with another under way in Brazil, and has overhauled its three British manufacturing plants.
It aims to build one million cars a year by 2020. Sources close to JLR told the newspaper it was a natural time to take stock after such rapid growth and insisted that there were no plans for redundancies.
Sales in China from July to September were down by a third year-on-year to 20,149 cars, against a wider market fall of 1.9 per cent.
That drop was offset by strong growth in America and Europe. It also faced a £245-million charge on 5,800 vehicles damaged in the huge explosion at the Chinese port of Tianjin in August.
Along with the Chinese problems, JLR faces pressure from regulators to cut its emissions or face hefty fines, the report said.
It has largely switched from steel to aluminium bodies, which lead to lower fuel consumption, but tougher emissions rules will require costly upgrades to models.
Leap 4.5 targets d4.5 billion of cumulative savings by the end of the decade.
It is likely to see more models built on similar core skeletons, greater efficiency in manufacturing, supply chains overhauled and recruitment slowed or halted.
The company has repeatedly stressed that it will continue the £3 billion-a-year spending on R&D and new plant and equipment.
JLR is yet to comment or confirm on the reported cost-cutting plans.
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