Understand brokerage charges and pricing models — Stock-Market notes

WHAT is brokerage?

WHY do the models differ? (Derivation from first principles)

WHY does percentage brokerage exist? Historically brokers gave advice + relationship service. Cost of serving scaled (they believed) with the money you moved, so they charged a slice of turnover.

Let turnover on one side $T = Q \times P$ (quantity $\times$ price).

$\text{Brokerage}_{\%} = \frac{p}{100}\, T = \frac{p}{100}\, Q P$

This is charged per leg (once on buy, once on sell), so a round trip costs $2\times$ .

WHY did the flat model appear? Technology killed the "cost scales with turnover" assumption. Executing a ₹500 order and a ₹5,00,000 order costs the broker the same server time. So discount brokers said: charge a constant.

$\text{Brokerage}_{\text{flat}} = f \quad (\text{independent of } T)$

Real brokers combine them with a cap:

$\boxed{\text{Brokerage} = \min\!\left(f,\ \frac{p}{100} T\right)}$

HOW to derive the break-even turnover where flat beats percentage. Set them equal:

$\frac{p}{100} T^\star = f \;\Rightarrow\; T^\star = \frac{100 f}{p}$

If your turnover $T > T^\star$ → flat is cheaper.
If $T < T^\star$ → percentage is cheaper.

Figure — Understand brokerage charges and pricing models

Worked Examples

Worked example Example 1 — Percentage vs flat on a small delivery trade

You buy 10 shares @ ₹200, sell later @ ₹220. Broker A: 0.30% per leg. Broker B: flat ₹20 per leg (delivery ₹0 in many, but assume ₹20 to compare).

Buy turnover $= 10\times200 = ₹2{,}000$ . Sell turnover $=10\times220=₹2{,}200$ .

Broker A brokerage $= 0.30\%\times2000 + 0.30\%\times2200 = 6 + 6.6 = ₹12.6$ . Why this step? Percentage is applied to each leg's own turnover separately.

Broker B brokerage $= 20 + 20 = ₹40$ . Why this step? Flat fee ignores turnover; here turnover is tiny so flat is worse.

Verdict: For small trades, percentage can win. Break-even $T^\star = \frac{100\times20}{0.30}=₹6{,}667$ per leg.

Common Mistakes (Steel-manned)

Recall Feynman: explain to a 12-year-old

Imagine a shopkeeper who carries your money to the market to buy toffees. One shopkeeper says "I'll take 30 paise for every ₹100 you spend." Another says "I'll just take a flat ₹20 no matter what." If you're buying a lot of toffees, the flat ₹20 is a bargain. If you're buying just one toffee, the tiny percentage is better. Also, the king (government) always takes his own small tax — the shopkeeper's fee and the king's tax are two different things!

Active Recall Flashcards

What is brokerage?

The fee a broker charges to execute your buy/sell order; the broker's own revenue, separate from statutory taxes.

Two main brokerage pricing models?

Percentage-of-turnover model and flat-fee (discount) model.

Formula for percentage brokerage per leg?

\frac{p}{100}\times

turnover, where turnover = quantity × price.

Formula for the break-even turnover between flat and percentage?

T^\star = \dfrac{100 f}{p}

, where

f

is the flat fee and

p

the percentage.

Above the break-even turnover, which model is cheaper?

The flat-fee model.

Is brokerage charged once or per leg?

Per leg — separately on buy and on sell.

GST is charged on what base?

18% of (brokerage + exchange transaction charges), NOT on turnover.

Does "zero brokerage" mean zero cost?

No — STT, stamp duty, exchange fees, GST and DP charges still apply.

Why did flat-fee discount brokers emerge?

Because technology made execution cost independent of trade size, breaking the "cost scales with turnover" assumption.

Break-even turnover if flat = ₹20 and percentage = 0.30%?

T^\star = 100×20/0.30 ≈ ₹6{,}667

per leg.

Connections

Statutory Charges — STT, Stamp Duty, GST, SEBI Fees
Contract Note — Reading Your Trade Bill
Discount Broker vs Full-Service Broker
Demat & DP Charges
Turnover and Position Sizing
Break-even Analysis in Trading

Concept Map

Hinglish (regional understanding)

Intuition Hinglish mein samjho

Dekho, jab bhi tum stock kharidte ya bechte ho, broker (middleman) tumhare order ko exchange par execute karta hai aur uske badle ek fee leta hai — usko bolte hain brokerage. Yeh broker ki apni kamai hai. Iske alawa jo STT, GST, stamp duty, exchange charges lagte hain woh government/exchange ke hain, broker sirf collect karke aage bhej deta hai. Confusion yahin hoti hai — log samajhte hain sab kuch broker le raha hai, lekin nahi.

Ab pricing model ka matlab hai broker fee kaise decide karta hai. Do main type: Percentage model — turnover ka 0.30% type, aur Flat model (discount broker) — jaise flat Rs 20 per order, chahe trade chota ho ya bada. Ek simple funda yaad rakho: bada trade karo toh flat sasta, chota trade karo toh percentage sasta. Break-even nikalne ka formula hai $T^\star = 100f/p$ . Iske upar turnover gaya toh flat jeet jaata hai.

Ek badi galti: log sochte hain GST turnover ke 18% par lagta hai — bilkul galat! GST sirf brokerage + transaction charges par lagta hai, jo bahut chhota amount hota hai. Aur "zero brokerage" ka matlab zero cost nahi — baaki taxes toh phir bhi lagte hain. Isliye contract note dhyaan se padho, sirf brokerage line mat dekho, total dekho.

Yeh 80/20 wala concept hai — agar tum active trader ho aur bade amounts move karte ho, toh galat model choose karke tum apne profit ka 5-20% bina matlab de doge. Toh apna turnover pattern dekho aur uske hisaab se broker choose karo.

Test yourself — Brokerage, Demat & Account Setup