Why you can lose money even when the call was right
The stock moved in the direction you expected, and the trade still ended in a loss. That is not bad luck. It is usually one of five other decisions going wrong, and every one of them can be named.
Published 6 September 2026 · Potoos Research Services
In short. Direction is one decision inside a trade, not the whole trade. How much you put in, where you entered, where you exited, what the fill actually cost you, and which instrument you used each decide the outcome too. A correct view expressed through the wrong size, the wrong entry, the wrong exit or the wrong instrument loses money, and this page walks through how, without pretending any of it can be engineered away.
The five decisions inside every trade
When a trade goes wrong, most people audit only one decision: was the view right or wrong. But a completed trade is the product of at least five separate decisions, and any one of them can sink it on its own.
- Direction
- What you expect the stock or index to do. The only decision most people grade.
- Size
- How much of your capital rides on this one idea, and therefore how much a single stop-out costs you.
- Entry
- The price you actually paid, versus the price at which the idea made sense.
- Exit
- Where you planned to leave, and whether you actually left there.
- Instrument
- Cash equity, futures or options. The same view behaves completely differently in each.
Being right on direction and wrong on any of the other four is the ordinary way careful people lose money. The rest of this page takes them one at a time.
Position sizing: the decision that decides survival
Size answers one question: if this trade hits its stop-loss, how much of my capital is gone? Answer it before entry and a losing trade is an expense. Skip it and a losing trade can be an event you spend months recovering from.
The failure pattern is conviction sizing. The idea feels strong, so the position grows to match the feeling rather than the plan. Now the arithmetic is unforgiving: a position that is half your capital, stopped out 10% below entry, has cost you 5% of everything you have, on one idea. Do that a few times in a row, which losing streaks guarantee you eventually will, and the account is damaged even if most of your calls were right.
Disciplined traders decide the maximum loss per idea as a fraction of capital first, and let that number set the position size. The exact fraction matters less than the fact that it exists, is small, and is decided before the trade rather than during it. This is also why we suggest a minimum capital of Rs 50,000 for our own service: below that, sensible per-trade sizing collides with subscription costs and minimum lot sizes, and the arithmetic stops being sensible.
A wrong call punishes you once. A sizing failure waits. You can be right five times in a row with an oversized position and feel vindicated, then give back all five results on the sixth. The record looks like one unlucky trade. It was six mis-sized ones.
Entry discipline: chasing turns a good idea into a bad trade
Every idea has a price at which it makes sense, and a price at which the same idea no longer does. This is why a proper recommendation gives an entry as a range rather than a single number: the range is the zone where the risk and the reward still stand in the right relationship to each other.
Chasing is what happens when the price runs before you act, and you enter anyway. The direction call may still prove correct, but you now own it at a level where the distance to a sensible stop has grown and the distance to the target has shrunk. Enough of a chase and a trade that was structured to risk one rupee for a sensible reward is now risking two for very little, with the same view behind it. The idea did not change. Your entry changed the trade around it.
The discipline is unglamorous: if the price has left the entry range, the trade is gone. There will be another. Missing a move costs you nothing. Chasing one costs you money precisely when the view was right, which is what makes it so hard to diagnose afterwards.
Exit discipline: the stop you move is not a stop
A stop-loss placed before entry is a decision made by the calmest version of you. A stop-loss moved during the trade is a decision made by the version of you that is watching money disappear. The first one is worth something. The second one usually is not.
The common sequence: the price falls toward the stop, and instead of exiting, you widen it, because the view still feels right. Sometimes the price then recovers, which is the worst outcome of all, because it teaches you that moving stops works. The time it does not recover, the loss is no longer the small planned one. It is whatever the market decided, plus the fact that you now hold a position with no exit plan at all.
The same failure has a mirror on the way out of winners: exiting the moment a position shows any gain, out of fear of giving it back, regardless of the plan. Both failures share one root: the exit was renegotiated mid-trade. Whatever the direction call was worth, the renegotiation took its place. This is why every call we publish carries its stop-loss and staged targets at the moment it is issued, in writing, before the market can apply any pressure to change them. The full anatomy of a call is described here.
Slippage and gaps: the fill is not the plan
A stop-loss is a trigger, not a guarantee. It is an instruction to exit when a level trades, and in an orderly market the fill lands near the level. In a fast market, or across a gap, it does not.
The clearest case is the overnight gap. You hold a stock with a stop 3% below your entry. Adverse news lands after hours, and the stock opens 9% down. Your stop triggers at the open, and the realised loss is three times the loss you sized the position for. Nothing malfunctioned. The stop did exactly what a stop does, and the plan was still exceeded, because a stop cannot execute at a price the market never traded through.
Costs work on the same side of the ledger. Brokerage, securities transaction tax, exchange charges, stamp duty and the bid-ask spread are each small, but they are subtracted from every single trade, winning and losing alike. The more often you trade, the higher the hurdle your direction calls must clear just to bring you back to zero. A right call that clears the market but not the costs is still a losing trade.
F&O decay: right on direction, wrong on time
Options add a clock to every view, and the clock is the part that catches people. An option's price is not just a bet on direction; it contains time value, and time value melts every day, faster as expiry approaches. Traders call it theta decay.
So a call option can lose value while the underlying index moves in your favour, if it moves too slowly, or too late. Be right about the direction but wrong about the week, and the option expires worth less than you paid, or worth nothing. The direction call was correct. The instrument punished the timing. Volatility does the same from another angle: options bought when implied volatility is high can deflate even as the underlying cooperates.
This is not a reason to treat derivatives as a trap. It is a reason to treat them as a separate skill with a separate clock. SEBI's own study of individual traders in equity derivatives, published on 20 August 2026, found 87.7% of them ended the year in the red. That number is not an argument that F&O is unbeatable. It is evidence that direction alone does not carry an options trade, and that anyone trading them without understanding decay is paying for that education in the market. It is also why our intraday F&O desk and our positional equity desk are separate subscriptions: they are different jobs, and nobody is pushed into derivatives to follow us.
Over-leverage: the same move, amplified both ways
Leverage does not change the market. It changes you. Borrowed exposure multiplies the effect of every price movement on your capital, in both directions, and it adds a participant to the trade who does not care about your view: the margin call.
The specific way leverage turns a right call into a loss is by shortening your survival window. A stock can travel to exactly where you said it would, through a dip deep enough to exhaust your margin on the way. The unleveraged holder rides the dip and sees the call vindicated. The leveraged holder is forcibly closed at the bottom of it. Same call, same chart, opposite outcomes, and the only difference was leverage.
The rule that survives is the boring one: exposure should be sized so that the ordinary noise of the market cannot force you out of a position the plan says to hold.
What this means for how you use any advisory
Everything above happens on your side of the screen, which is exactly why an honest research service is specific about what it controls and what it does not. We control the structure of the call: an entry range, staged targets, a stop-loss set before entry, and the reasoning in writing. You control the size, the fill, and whether the plan survives contact with your emotions. No service can promise you an outcome, and we have written separately about what one can and cannot do for you. What a service can be is auditable: every Potoos call is dated, kept, and never edited after the fact, losses on the same screen as wins, inside the app.
And before you follow anyone, us included, verify the registration: here is how to check any Research Analyst on SEBI's own register in about five minutes.
Common questions
If the direction was right, whose fault is the loss?
Audit the trade, not the view. Was the size decided before entry? Was the entry inside the range or a chase? Did the stop stay where it was planned? Was the instrument carrying a clock the view did not account for? In most right-direction losses one of those four answers explains everything, and each of them is fixable in a way that luck is not.
Does a stop-loss guarantee my maximum loss?
No. A stop-loss is a trigger, not a guarantee. In a gap or a fast market the actual fill can be worse than the level, sometimes much worse, and no analyst or broker can change that. What a stop-loss guarantees is that the exit decision was made in advance, by the calm version of you, instead of improvised mid-loss.
Why did my option lose money when the index moved my way?
Because an option prices time and volatility as well as direction. Time value decays daily, faster near expiry, so a move that arrives slowly or late can be fully eaten by decay. A fall in implied volatility does the same. Direction is one input into an option's price, and it is entirely possible to get that one input right and still lose.
Can position sizing remove the risk of loss?
No. Nothing removes it, and anyone who says otherwise is selling something. Sizing changes what a loss costs you, not whether losses happen. Its job is to make every individual loss survivable, so that no single trade, or losing streak, can take you out of the market entirely.