India plans to slash tariffs on cars imported from the European Union to 40% from as high as 110%, sources said, in the biggest opening yet of the country's vast market as the two sides close in on a free trade pact that could come as early as Tuesday, Reuters reported. 

Prime Minister Narendra Modi's government has agreed to immediately reduce the tax on a limited number of cars from the 27-nation bloc with an import price of more than 15,000 euros ($17,739), two sources briefed on the talks told Reuters.

This will be further lowered to 10% over time, they added, easing access to the Indian market for European automakers such as Volkswagen, Mercedes-Benz and BMW, according to Reuters.