based on my understanding, discounts will still be the same. tax free is just the tax portion paid is exempted.

means if car X is sold for 200k under normal circumstances (before road tax and insurance and registration fee and small small items i.e. just car price alone if you look at the price list), and tax free price is say 150k and all the tax rate say is 100%, it means the the basic car price is 50k, tax 50k and all accessories price amounts to 100k (and this is where car manufacturers screw you inside out).

the quote of 150k for the car price is before any discounts. you see this will not affect their margins in any way thus will be able to provide you with the usual discounts.

quite rare to get discounts but no harm trying