A good trade idea placed through the wrong order type stops being a good trade. This is one of the least glamorous topics in the market and one of the most expensive to get wrong.
Here is what each order type in the stock market actually does on an Indian exchange, and when to reach for it.
Market order: certainty of execution, not of price
A market order says: buy or sell now, at whatever price is available.
It will almost always execute. What it does not guarantee is the price. In a liquid large-cap during normal hours the difference is negligible. In an illiquid stock, at the open, or on an event day, the gap between the price you saw and the price you got can be significant — this is slippage.
Use it when getting out matters more than getting a specific price. Avoid it at 9:15, on illiquid counters, and on far out-of-the-money options where the spread is wide.
Limit order: certainty of price, not of execution
A limit order says: buy at this price or better, sell at this price or better, and wait.
You control the price completely. What you give up is certainty that anything happens at all — if the market never reaches your level, the order simply sits unexecuted until it expires at the end of the day.
Use it for entries where you have a specific level in mind, and on anything illiquid. Be careful using it for exits during a fast move against you, because the price you are waiting for may never come back.
SL and SL-M: the two stop-loss orders, and the difference that matters
Both exist to close a position when the market goes against you. They behave differently at the moment it matters.
| SL (stop-loss limit) | SL-M (stop-loss market) | |
|---|---|---|
| What you set | Trigger price and limit price | Trigger price only |
| On trigger | A limit order is placed | A market order is placed |
| Guarantees exit? | No — can go unfilled in a fast move | Yes, at whatever price is available |
| Controls price? | Yes | No |
The failure mode people meet the hard way: on a gap down, an SL order triggers, places a limit order at your price, and the market is already well below it. The order sits unfilled while the position keeps losing. SL-M would have exited — at a worse price than you hoped, but exited.
Note that exchanges restrict SL-M on certain instruments at certain times, so availability varies. Check before relying on it.
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Bracket and cover orders: intraday with risk attached
These bundle a position with its exits so you cannot forget to place them.
A cover order is an entry plus a compulsory stop-loss, submitted together. Because the risk is defined at entry, brokers typically offer higher intraday leverage on it.
A bracket order adds a target as well: entry, stop-loss and target in one instruction, often with a trailing stop option. Whichever of the two exits triggers first, the other is cancelled automatically.
Both are intraday products and square off automatically before the close. Availability and leverage on these have changed with regulation over the years, so check what your broker currently offers rather than assuming.
The genuine benefit is behavioural: the stop-loss goes in at the same instant as the entry, when you are still thinking clearly.
AMO and GTT: orders for people who are not watching
AMO (After Market Order) lets you queue an order outside market hours. It is not executed at night — it simply sits and is submitted when the market opens. Useful if you decide something in the evening and will be busy in the morning. Be careful pairing AMO with market orders, since the open is exactly when slippage is worst.
GTT (Good Till Triggered) is more interesting. A normal order dies at the end of the day; a GTT waits at the exchange for a long period until your trigger condition is met. You set a price condition once and forget it.
This suits long-term investors well: a target to book profit, a stop to protect a holding, or an entry at a level you would be happy to buy at if the market ever offers it. Validity periods and exact behaviour are broker-specific, so read the terms.
Which order type to use, in one table
| Situation | Use | Why |
|---|---|---|
| Must exit now, price secondary | Market / SL-M | Execution is guaranteed |
| Entry at a specific level | Limit | You control the price |
| Illiquid stock or wide spread | Limit | Market orders slip badly here |
| Protecting an intraday position | SL-M | Fills even on a gap |
| Intraday with defined risk | Cover / Bracket | Stop goes in with the entry |
| Decided at night, busy at 9:15 | AMO (limit) | Queued for the open |
| Long-term target or stop | GTT | Survives beyond one day |
The pattern underneath all of it: market orders trade price certainty for execution certainty, and limit orders trade the opposite. Every other order type is a combination of those two ideas with conditions attached.
Three mistakes worth avoiding
Market orders at 9:15. The first minutes carry the widest spreads and the most volatility of the day. A limit order costs you nothing to try.
Using SL instead of SL-M for protection. If the purpose of the order is to guarantee you are out, an SL that can go unfilled is not doing that job.
Placing the stop later. The order you intend to place after the trade moves is the one you talk yourself out of. Place it at entry, or use a cover or bracket order that forces the issue.
If you want this taught properly alongside charts, company analysis and position sizing, our Stock Market for Beginners course covers it in module three for Rs {{price:stock-basics}}, with lifetime access.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser; this is educational content, not investment advice. Order type availability and behaviour vary by broker and change over time — check current terms before relying on any of them.
Frequently Asked Questions
What is the difference between SL and SL-M orders?
An SL order places a limit order when the trigger is hit, so it controls your exit price but may go unfilled in a fast move. An SL-M places a market order on trigger, so it fills at whatever price is available. If the purpose is to guarantee you are out of a position, SL-M does that job and SL may not.
When should I use a market order instead of a limit order?
When getting executed matters more than the exact price - typically when exiting a position that is moving against you. Avoid market orders at the open, on illiquid stocks and on wide-spread options, where slippage can be significant.
What is a GTT order?
Good Till Triggered. Unlike a normal order that expires at the end of the day, a GTT waits at the exchange for an extended period until your price condition is met. It suits long-term investors setting a target or protective stop without watching the market daily.
What is an AMO order?
An After Market Order, placed outside market hours. It is not executed at night - it is queued and submitted when the market opens. Useful if you decide in the evening and cannot be at your screen in the morning, though pairing it with a market order exposes you to opening volatility.
What is the difference between a cover order and a bracket order?
A cover order is an entry plus a compulsory stop-loss. A bracket order adds a target as well, and cancels the remaining leg when one triggers. Both are intraday products that square off before the close, and availability varies by broker.
Related Reading
- How to learn the stock market from scratch
- Stock Market for Beginners - the 8-module course
- What are outstanding shares?
- All course fees, stated plainly
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
