Order Types5 min read

What Is a Limit Order? Market vs Limit vs Stop Orders

A limit order is an instruction to buy or sell at a specified price or better. A buy limit fills at your price or lower; a sell limit fills at your price or higher. It will never fill at a worse price than you specified — but it may not fill at all.

Every order type is a trade-off between two things you cannot have simultaneously: control over the price you get, and certainty that you get filled. Understanding which of those matters more in a given situation is the whole skill.

The four order types

Nearly everything you will ever place is one of four types, and each solves a different problem.

Market order — fills immediately at the best available price. Certain fill, uncertain price.
Limit order — fills at your price or better. Certain price, uncertain fill.
Stop order — becomes a market order once a trigger price is reached. Used for exits and breakout entries.
Stop-limit order — becomes a limit order at the trigger. Price control, but may not fill in a fast move.

When to use a limit order

Limit orders suit planned entries into a level. If you want to buy a support zone, a buy limit inside the zone gets you filled at your price without watching the screen, and you know your risk before it triggers.

They also matter for cost. A limit order that rests on the book adds liquidity, and on many venues that means a lower fee — or a rebate — compared with taking liquidity via a market order. Over hundreds of trades that difference is significant.

When a market order is correct

Use a market order when being in — or out — matters more than the price. Exiting a losing position is the clearest case: a stop-limit that fails to fill in a fast move leaves you in a trade you had decided to leave.

The same applies to a breakout you have decided to take. Chasing with a limit order that sits just behind price frequently results in watching the move happen without you, which is a worse outcome than a few points of slippage.

The risk of unfilled limits

The classic failure is a limit order at the exact edge of a zone that price approaches to within one tick, reverses from, and never returns to. Your analysis was correct and you made nothing.

The usual remedy is to place the limit slightly inside the zone rather than at its extreme, accepting a marginally worse price for a materially higher fill rate. Alternatively, split the order: part as a limit into the zone, part as a market order on confirmation.

Frequently asked questions

What is the difference between a limit order and a stop order?

A limit order sits at a better price than the current market and fills at your price or better. A stop order sits at a worse price and activates once price reaches it, then executes as a market order. Limits are for planned entries; stops are for exits and breakout entries.

Can a limit order fill at a better price?

Yes. A buy limit will fill at your price or lower, so if the market gaps down through your level you may be filled better than specified. It will never fill worse.

Should I use a stop-limit for my stop loss?

Generally no. In a fast move a stop-limit may not fill, leaving you in a losing position with no protection. A standard stop uses a market order and guarantees the exit, accepting possible slippage as the price of certainty.

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