used vehicle

GST will be applicable on Profit Margin (Sale -Purchase )

Note : Purchase value will be Book value

Thanks for information.
If book value of 1-4-2018 is 2.5 lacs and this is exchanging with same showroom and they valued below 2.5 lacs is there any tax liability?
and also if valued amt is above book value can we issue tax invoice and also can we collect marginal tax value? and also while filing 3B return which value is to be shown?

Then no GST is applicable , if its being exchange below book value . As the transaction value (exchange value ) is less then Book value