"Zero brokerage" is the most successful piece of marketing in Indian retail finance — and the least complete. Every trade carries a stack of statutory charges no broker can waive: STT, exchange transaction charges, SEBI fees, GST, stamp duty, and DP charges on delivery sells. Each is small. Traded frequently, together they compound into a silent tax on activity that decides whether a trading habit can be profitable at all.
The stack on every trade
The brokerage calculator itemises a round trip — buy and sell — across the whole stack:
- Brokerage — the broker's own fee, often zero on delivery and flat per order on intraday.
- STT — securities transaction tax, the largest statutory line on delivery trades, charged on both legs.
- Exchange transaction charges and SEBI fees — turnover-linked slivers.
- GST — 18% on brokerage and transaction charges.
- Stamp duty — on the buy side.
- DP charges — a flat fee per stock per day when you sell from your demat, which is why selling ₹500 of shares can cost a visible percentage.
The output that matters is the break-even move: how far the price must rise before you are merely back to zero. On small, frequent trades it is often several times what intuition suggests — and it is the number to know before the trade, not after.
Averaging down is a decision, not a reflex
Buying more of a falling stock lowers your average price — the stock average calculator computes the new break-even in a second. What no calculator computes is whether the fall is noise or information. Averaging down doubles your exposure to the very position that is currently going against you; done as a reflex it is loss aversion wearing a strategy's clothes. Run the number, then ask the only question that matters: would you buy this stock today at this price with fresh money, if you did not already own it?
Leverage: the margin math
Margin trading funds a position larger than your capital: at 20% margin, ₹1 lakh controls ₹5 lakh — 5× leverage, with every gain and fall on the position multiplied five times against your stake. A 20% adverse move wipes the capital entirely. The margin calculator shows the funding and leverage arithmetic (actual F&O margins combine SPAN and exposure and vary by instrument). Leverage also multiplies the cost stack — the statutory charges apply to the full position size, not to your margin.
Worth naming for perspective: a diversified fund's expense ratio charges a fraction of a percent per year, while an active trading habit can pay that in statutory charges in weeks. The comparison between trading and investing is usually framed as a skill question; it is at least as much a cost question — the same force documented in what a fund really costs.
⚠️ STT rates, exchange charges and stamp duty are set by the government and exchanges and revised periodically; broker schedules differ. The calculator uses a discount broker's published equity schedule — verify current rates. Nothing here is trading advice; WealthTicker is not a SEBI-registered investment adviser.
Key takeaway
Zero brokerage is not zero cost — STT, exchange charges, GST, stamp duty and DP fees stack on every trade, and the honest metric is the break-even move before a position earns anything. Compute it before trading, treat averaging down as a fresh buy decision rather than a rescue, and respect that leverage multiplies the costs and the falls exactly as faithfully as the gains.
Terms used here
More in Module 11 — Money beyond funds: salary, tax, loans and property
Decoding your CTC: why in-hand is so much less
Cost to company is what employing you costs, not what you are paid. The four layers inside a CTC, where EPF and gratuity actually go, and the basic-salary split that silently sets three benefits at once.
Old vs new tax regime: the choice that decides everything else
The new regime is the default and usually the winner — but not always. Where the break-even sits, why the §87A rebate never touches capital gains, and why the regime decides whether ELSS, HRA and 80D planning are worth anything at all.
Advance tax and TDS: how India collects before you file
TDS is a running prepayment, not the final bill, and advance tax fills the gap in four dated instalments. The 15/45/75/100 calendar, the cliff in the early triggers, and the presumptive shortcut that collapses it to one March payment.
ESOPs, RSUs and ESPPs: taxed twice, at two different prices
Slab tax on the discount when shares become yours, capital gains from that day's FMV when you sell. Why tax can fall due on paper value, and why the cost-basis error is the most common mistake in self-filed returns with equity comp.
Freelancing full-time: the 50% deal most professionals miss
Presumptive taxation lets a qualifying professional declare half of gross receipts as profit — no books, no audit, one advance-tax instalment. How the scheme works, and how to compare a salary and a freelance offer honestly.
How an EMI actually works (and the flat-rate trick)
Interest on the outstanding balance first, principal with the remainder — so early years barely repay anything. Why tenure sets total interest, why early prepayment punches above its weight, and why a flat rate is roughly double what it claims.
A surplus and a loan: prepay, refinance or invest?
Prepayment is a guaranteed, tax-free return equal to your loan rate — cut the tenure, not the EMI. When a balance transfer clears its fees, and when investing the surplus honestly beats both.
Rent vs buy: the honest math
Terminal net worth on two fully-specified paths, with the renter investing every rupee the buyer sinks. The two assumptions that decide the answer, and the tax change that flipped older calculators' verdicts.
The small savings family: PPF, SSY, NSC, KVP, SCSS and kin
One sovereign family, priced quarterly. Which schemes compound, which pay income, which are tax-exempt — and why the after-tax yield, not the poster rate, is the number to compare.
Insurance is not an investment: term plans and the LIC question
Bundled policies do both jobs badly. Sizing a term cover from needs rather than folklore, and evaluating an endowment you already own on forward numbers alone — surrender, paid-up or continue.
Running a small business by the numbers
Break-even and the margin of safety, margin versus markup, the cash conversion cycle, the DSCR a lender will compute anyway, and GST as an input-credit chain — the five checks that catch trouble early.