"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 go, and what basic salary decides.
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, and why the regime decides if ELSS, HRA and 80D matter.
Advance tax and TDS: how India collects before you file
TDS is a running prepayment, not the final bill; advance tax fills the gap in four dated instalments. The 15/45/75/100 calendar and the presumptive shortcut.
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 the basis error.
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. How it works, and how it compares to salary.
How an EMI actually works (and the flat-rate trick)
Interest on the outstanding balance first, principal with the rest — so early years repay very little. Why tenure sets total interest, and the flat-rate trap.
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 or investing the surplus beats it.
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 and the tax change that decide it.
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 after-tax yield, not the poster rate, matters.
Insurance is not an investment: term plans and the LIC question
Bundled policies do both jobs badly. Sizing a term cover from needs, not folklore, and judging an endowment you own on forward numbers, not on premiums paid.
Running a small business by the numbers
Break-even and margin of safety, margin versus markup, the cash conversion cycle, DSCR and GST as an input-credit chain — five checks that catch trouble early.
Section 80C: the whole ₹1.5 lakh menu, not just ELSS
A shared ceiling, not a product — and EPF, home-loan principal and tuition fees may already fill it. Count the headroom before you buy anything to fill it with.
Section 80D: two buckets, and the cash rule that voids most claims
₹25,000 for your family and another ₹25,000 for your parents, each rising to ₹50,000 at 60 — with the check-up allowance inside those limits.
HRA exemption: the least of three numbers, and which one binds
Actual HRA, rent minus 10% of basic, or 50/40% of basic — all keyed to basic salary rather than CTC, and all available only under the old regime.
Property capital gains: what actually changed when indexation went
Bought before 23 July 2024, a resident pays the lower of 12.5% flat and 20% indexed — but that relief caps the tax payable, not the gain itself.
Home loan eligibility: what a bank will lend is not what you can afford
FOIR caps total EMIs against income and subtracts existing loans in full; LTV caps the loan against the property. Neither asks what you can afford.
Education loans and Section 80E: the deduction with no ceiling
Uncapped on interest, but only for eight years from the year repayment starts — so the window, not the amount, is the constraint that should set your tenure.
From the blog
Averaging down a stock: what the new average hides
10 Oct 2026
Buying more after a 40% fall cuts the break-even rise from 66.7% to 22.2%, but triples the stake and nearly doubles the loss if it halves again.
Margin trading facility: what borrowing for shares costs
10 Oct 2026
₹1 lakh buys ₹4 lakh of shares on MTF. At an illustrative 15% a year, the stock must rise 11.25% a year just to cover interest, and a 10% fall costs 52%.
Direct stocks or mutual funds: what should beginners pick?
02 Oct 2026
Buying stocks yourself versus owning them through a mutual fund: diversification, cost, tax, time and behaviour compared, and a sensible way to do both.