Direct answer
A limit order in forex instructs a broker to execute only at a chosen price (or better). A stop limit order combines two prices: a stop price that activates the order, and a limit price that caps the acceptable execution price once the order is activated.
Explanation: the mechanics (what you set and how it triggers)
A limit order uses a single price level—often described as:
- Buy limit: executes at your limit price or lower.
- Sell limit: executes at your limit price or higher.
A stop limit order adds a trigger condition:
- When price reaches your stop level, the system switches the order into a limit order.
- From that point, execution is still restricted to your chosen limit price (or better).
Common input fields you typically configure include:
- Instrument (the forex pair)
- Side (buy or sell)
- Stop price (the activation threshold)
- Limit price (the execution cap/target after activation)
- Order size
- Validity (how long the order remains active)
Example and checks: comparing outcomes
Consider a sell stop limit scenario:
- You set a stop price where you want the order to activate.
- You set a limit price at which you are willing to sell.
Two independent possibilities follow:
- Activation happens: if price reaches the stop, the order becomes a limit order.
- Fill may or may not happen: if price then moves quickly beyond your limit, the market can trade where your limit is not accepted, so execution may not occur.
To independently check whether the setup matches your intent, compare your stop and limit relationship:
- If your order is structured so that the limit is “worse than” what price is likely to trade once the stop triggers, fills become less likely.
- If the limit is positioned reasonably relative to the stop, the chance of an execution at the allowed price range improves—but outcomes still depend on how price moves after activation.
Relevant limitations and risks
Stop limit orders do not guarantee execution. The main limitation is price movement risk: between reaching the stop and trading at the limit price, the market can move past your acceptable execution level.
Other practical uncertainties include:
- Liquidity and spreads: even when the price level is reached, execution quality can vary.
- Order validity and platform behavior: the exact behavior can depend on the broker’s order handling rules and the order validity settings.
Because these effects vary by market conditions and by broker/platform, the most reliable verification comes from your broker’s order-entry rules and order management interface (for example, how it displays activation, partial fills, and cancellation).