Is green tax incudible in taxable supply

shubham bansal (-) (46 Points)

18 May 2018  
Is green tax charged by delhi goverment for entering of vehicles in delhi, to be included in taxable value for calculation of gst ?

Because our client has received Purchase order from larsen & toubro in which they have not charged GST on green tax.
e.g. Taxable Value Rs. 1,00,000
Add: GST @ 5% Rs. 5,000
Add: Green Tax Rs. 2600 per vehicle

So L& T is not paying to our client GST on Rs. 2600.

Please help me out in this. Thank you.