There are no charges for transacting in smallcases. Only the standard brokerage and other statutory taxes, GST, STT, brokerage, etc will be applicable as usual.
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These are the charges levied by your broker while investing in a smallcase

Brokerage : Rs 20
Other Charges :
STT/CTT : 0.1% on buy & sell
Transaction charges : NSE: 0.00345%
GST : 18% on (brokerage + SEBI charges + transaction charges)
SEBI charges : ₹10 / crore + GST
Stamp charges : 0.015% or ₹1500 / crore on buy side

​💡 Good to know: Funds are deducted from your trading account and stocks are credited to your Demat account.