Slippage, gaps and weekend risk in forex

The price you ask for is not always the price you get. Slippage, price gaps and the weekend break are part of trading any market, and they matter most when the market moves fast. This guide explains what slippage is, why gaps happen, what the weekend means for open positions and the practical ways traders reduce the damage.

What slippage is

Slippage is the difference between the price you expected when you placed or triggered an order and the price at which it was actually filled. It happens because prices can move in the moment between your order reaching the broker and the trade being executed, and because there may not be enough volume available at your exact price.

Slippage can work in either direction. Negative slippage gives you a worse price than expected. Positive slippage gives you a better one. Regulated brokers in many countries are required to have an order execution policy describing how they handle price changes, and some pass on positive slippage as well as negative. Check your broker's policy so you know how it works for your account.

Which orders can slip

Order type	Can it slip?	Why
Market order	Yes	It fills at the best available price, whatever that is when it arrives
Stop order, including stop loss	Yes	When the stop price is reached it becomes a market order
Limit order, including take profit	Not to a worse price	It fills only at your price or better, but it may not fill at all
Guaranteed stop, where offered	No	The broker guarantees the stop price, usually for an extra charge

The key point for risk control is that an ordinary stop loss is not a guarantee. It closes your trade at the next available price after the stop is touched. In a calm market that is almost always very close to your level. In a fast market it can be some distance away. Our forex order types guide explains each order in more detail.

When slippage is most likely

• Around major economic releases and central bank decisions, when prices can jump in seconds.
• In thin liquidity, such as late in the New York session or during holidays.
• On less traded pairs and exotics, where fewer orders are available at each price.
• With large order sizes relative to the volume available.
• At the market open after a weekend or holiday.

Spreads also tend to widen at these times, which raises the cost of entering and exiting even before any slippage. Our market sessions and economic calendar guide shows how to see these windows coming.

Price gaps

A gap is a jump in price where no trading takes place between two levels. On a chart it shows as an empty space between one candle and the next. Gaps happen when new information arrives while trading is closed or very thin, so the market reopens or resumes at a quite different price.

If your stop loss sits inside a gap, it cannot be filled at your level, because no trades took place there. It will be filled at the first available price after the gap, which can mean a loss larger than you intended. The same applies to pending entry orders, which can be filled well beyond your chosen price.

Weekend risk

The spot forex market trades around the clock from Monday morning in Asia to Friday afternoon in New York, then closes for the weekend. Gold and other CFD markets on most platforms follow similar hours with their own breaks. Anything that happens while the market is closed, such as an election result, a political shock or an unexpected policy announcement, is reflected all at once when it reopens.

That is why the Sunday or Monday open can gap away from Friday's close. Most weekends the gap is small. Occasionally it is large, and history includes sudden moves outside normal hours too, such as when the Swiss National Bank unexpectedly removed its minimum exchange rate for the franc against the euro and EUR/CHF moved by a very large amount within minutes, far beyond many traders' stops.

Choice before the weekend	Trade off
Close positions on Friday	No gap risk, but you give up any move over the weekend and pay the spread again when you open a new position
Hold with a smaller size	Gap risk remains, but a gap through your stop costs less
Hold with a guaranteed stop	Known worst case, at the cost of the guarantee premium where offered
Hold at normal size	Full exposure to any weekend news; swap is also charged for the weekend

Practical ways to reduce the impact

• Size for the bad case. Choose a position size where a stop filled at a worse price than intended would still be an acceptable loss. The lot size calculator helps with the normal case; leave headroom for slippage.
• Know the calendar. Avoid opening new trades just before high impact releases if you cannot accept a sharp move.
• Prefer liquid markets. Major pairs usually slip less than exotics.
• Use limit orders for entries when the exact price matters more than being filled.
• Review your fills. Compare requested and filled prices in your trade journal to see how much slippage you really experience.

A worked example

You buy EUR/USD at 1.10000 with a stop at 1.09800, a 20 pip stop, and a size of 0.50 lots, so each pip is worth about 5 dollars and you expect to risk about 100 dollars. A surprise announcement hits and the price falls quickly. Your stop is triggered at 1.09800 but the first available price is 1.09750. The trade closes 25 pips lower, a loss of about 125 dollars instead of 100. Sizing with some headroom means a fill like this hurts, but does not break your rules.

Slippage and gap checklist

• I know an ordinary stop loss is not guaranteed.
• I check the calendar for high impact news before trading.
• I size positions so that a gap through my stop is survivable.
• I decide on purpose whether to hold positions over the weekend.
• I know whether my broker offers guaranteed stops and what they cost.

Frequently asked questions

Is slippage always bad?

No. Slippage can be negative or positive. A fill at a better price than requested is positive slippage, and some brokers pass this on as well.

Does a stop loss protect me from gaps?

Not fully. An ordinary stop becomes a market order when triggered, so after a gap it is filled at the first available price, which can be beyond your stop. Only a guaranteed stop, where offered, fixes the exit price.

Should I close trades before the weekend?

It depends on your approach and risk tolerance. Closing removes gap risk, while holding keeps exposure to weekend news; holding with a smaller size is a common middle ground.

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