Hey @rachit,
The Exchange transaction charges are charged at the slab applicable to you depending on your overall turnover. When your turnover exceeds 1250 crores, then a lower rate of transaction charges (at Rs.320/crore) gets charged automatically.
As far as the GST is concerned, it’s a grave offence if an entity collects GST and doesn’t remit it to the Government. We charge 18% GST on brokers & transaction costs, and remit the same to the Government, so there’s no extra GST collected. As a client if you’ve regsistered for GST and want to take input tax credit of the GST (lawfully), you can also provide us the GST number after which we’ll file the GST under your GST registration number.