Costs

Chapter 10's figures are after transaction costs — SEBI says so explicitly. This chapter is what those costs are and why they matter more here than anywhere else in the course.

What is charged

Five things, on every round trip.

Brokerage. Often a flat amount per order rather than a percentage. Flat sounds cheap and is not, for small trades: a fixed ₹20 on an option bought for ₹500 is 4% before anything else happens.

Exchange transaction charges, levied on turnover.

Securities transaction tax, on the sell side, with different rates for futures and options and a different base for each.

Stamp duty, on the buy side.

GST, on brokerage and transaction charges.

Plus the one nobody bills: the spread, which chapter 7 of the markets subject priced. A round trip pays it once.

Rates change with budgets and exchange circulars, so this chapter does not quote them — the broker's own contract note does, and reading one is the single most useful exercise in this chapter.

Why they bite harder than in equities

Three structural reasons.

Charged on notional, not on your deposit. This is the big one. Chapter 5's position was ₹18,00,000 of index against ₹1,80,000 of margin. Turnover-based charges apply to the ₹18,00,000. Your costs are scaled to the position you control, not the money you put up — the same leverage that magnifies the gain magnifies the fee.

Small premiums, fixed costs. An option trading at ₹8 with a lot of 75 is a ₹600 premium. A flat brokerage either side plus taxes can be a double-digit percentage of that before the market moves at all.

Frequency. A long-term equity investor pays costs once and holds for years. Weekly options expire weekly, so the position is re-established constantly, and every re-establishment pays again. Fifty round trips a year on the same capital is fifty sets of charges.

Put those together and derivatives costs can consume a large share of a small account's capital annually, independent of whether any trade was right.

The breakeven that gets forgotten

Chapter 6's break-even for a bought call was strike plus premium. The real one is worse:

real break-even = strike + premium + round-trip costs

And for a short-dated option, costs can be a meaningful fraction of the premium itself. You need the underlying to move further than the diagram suggests, in less time than you think.

This is why the gap between "I was right about direction" and "I made money" is wider in derivatives than anywhere else in this course.

Why this makes the segment negative sum

Chapter 1 said it and this chapter is the mechanism.

Every rupee of brokerage, exchange charge, tax and stamp duty leaves the participants and goes to brokers, exchanges and the government. The participants' collective profit and loss is therefore the zero-sum result minus all of that.

So the population of traders cannot collectively break even. The best possible aggregate outcome for everybody trading derivatives, taken together, is a loss the size of the costs. SEBI's ₹1,05,603 crore is that, plus the distribution of who gained and lost among themselves.

Reading your own contract note

The exercise worth doing before any conclusion about your own trading.

The contract note itemises every charge on every trade. Add up a month of them, and compare that total with your profit and loss for the month.

Most people who do this for the first time discover their costs are a larger number than they assumed and sometimes larger than their net result. It is the most direct evidence available about whether an approach can work, and it is sitting in an email.

The one honest mitigation

If you do trade, the costs are the only part of the outcome fully under your control.

Fewer trades, larger and less frequent, in liquid contracts with tight spreads, at a broker whose charges you have actually added up. None of that creates an edge. It stops the costs consuming one that might exist.

The point

Derivatives costs are charged on notional value rather than on your margin, so leverage magnifies them; they are a large proportion of small premiums; and weekly expiries force frequent re-establishment. They are also what makes the segment negative sum — the best collective outcome for all participants is a loss the size of the costs.