A related issue that I faced: Securities Transaction Tax is not shown on a per-trade or per-scrip basis. Instead, only the sum of STT paid each day is shown in that day’s account statements. This is a serious issue when it comes to tax filing, because the tax code explicitly prohibits us from showing STT as an expense. Which means: for each (buy, sell) pair of trades that we make, we are supposed to discount the STT on either leg of the pair, when computing our tax liability. Since Zerodha does not give us the trade-wise break-up of STT paid, it is impossible for us to do this if we do two or more transactions on a day.
The Zerodha account statement has fine print which says that detailed list of charges will be given to us on request. I made this request once, and it took quite a few days (couple of weeks?) for the detailed list to come by email. Since this (requesting for breakup of charges for each day that I buy/sell something) didn’t look scalable, I have resigned myself to doing at most one transaction on Zerodha per day. This is the only way I can be sure that I will know the exact STT paid on each transaction, when it comes to computing taxes. I am fine with this, since I can adjust my trading strategy to fit this. Nonetheless, this is a place where Zerodha can improve.