A stop-loss is an order that sits dormant until the price reaches a level you chose, then activates automatically. Its job is to get you out of a losing position without you having to watch the screen.
There are two flavours, and the difference between them is the single most confusing thing in order entry.
Two prices, two jobs
- Trigger price — the level at which your sleeping order wakes up and is sent to the exchange.
- Limit price — once awake, the worst price at which it is allowed to execute.
SL-M: stop-loss market
You set only a trigger price. When the price touches it, a market order is fired.
You bought at ₹500. You place an SL-M sell with trigger ₹480.
Price drifts down and touches ₹480. A market sell order is released and executes immediately at the best available bid — ₹479.90, ₹479.50, whatever is there.
You are out. The exact exit price was not in your control.
Strength: it almost always gets you out. Weakness: you have no control over the exit price.
SL: stop-loss limit
You set both a trigger price and a limit price. When the trigger is hit, a limit order is sent.
You bought at ₹500. SL sell with trigger ₹480, limit ₹478.
Price touches ₹480. A sell limit at ₹478 is sent. It executes anywhere at ₹478 or above.
But: if the price is crashing and jumps straight from ₹480 to ₹470, your limit at ₹478 never fills. You are still holding the stock, now at ₹470, with an unfilled order in the book.
Strength: control over the exit price. Weakness: in the exact scenario you bought protection for — a sharp fall — it can fail to execute.
Direction: get this right
For a long position (you own the stock), the stop-loss is a sell order with a trigger below the current price.
For a short position (you sold first, intending to buy back), the stop-loss is a buy order with a trigger above the current price.
If you place a stop-loss trigger on the wrong side of the current market price, the result can depend on the broker's validation. The broker may reject it; if it is accepted, the trigger condition may already be satisfied and the order can trigger immediately. For a long position, a sell stop is normally placed below the current market price. For a short position, a buy stop is normally placed above it.
Entering the trigger on the right side at the wrong level is the expensive mistake.
Where to place the stop
There is no formula that works for everyone, but there are two sensible habits.
Base it on the stock, not on your wallet. "I can only afford to lose ₹2,000" is about you, not about the stock. A stop placed inside the stock's normal daily range will be hit by ordinary noise. Look at how much the stock typically moves in a day and place the stop outside that.
Base it on a level. Below a recent swing low, below a support level — somewhere that, if breached, genuinely means your reason for the trade was wrong.
What a stop-loss cannot protect against
Gaps. The market closes at ₹480 and opens at ₹430 after bad news overnight. Your ₹470 trigger fires at the open and you exit near ₹430. A stop-loss operates during trading hours; it cannot act on a price that never traded.
Circuits. If the stock is locked at its lower circuit, there are no buyers at any price inside the band. Your order cannot execute at all until the lock breaks.
These are not flaws in the tool. They are the limits of what any exit instruction can do.
Trailing stop-loss
A trailing stop moves in your favour but never against you. Buy at ₹500 with a ₹20 trail: stop starts at ₹480; price rises to ₹540, stop moves to ₹520; price falls back, the stop stays at ₹520 and eventually triggers there.
It locks in profit as the trade works, without you having to adjust it manually. Many brokers offer it directly; otherwise you modify the stop yourself as the price moves.
Key takeaways
- Trigger price wakes the order up; limit price caps where it may execute.
- SL-M fires a market order — it gets you out, at an uncontrolled price.
- SL fires a limit order — it controls price, but can fail to execute in a fast fall.
- Place the stop where the stock proves you wrong, not where your loss tolerance happens to sit.
- No stop-loss protects against overnight gaps or a circuit lock.
Check your understanding
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