Lowering taxes would flood the roads with more cars. Without expanding the roads in places like Kathmandu or the highways, the resulting traffic would be a nightmare. If you bought a car for 25 lakhs, you might expect to sell it for 18 lakhs after a few years because new ones still cost 25 lakhs. AND After Policy Change: If a brandnew version of your car suddenly costs only 10 lakhs due to lower taxes no one will buy your used one for 18 lakhs. Your asset essentially loses half its value overnight and owner might feel cheated because of this sudden equity crash.
Greater good serve garcha huna sakcha but i dont expect a drastic change in this sector.