How Spreads Work in Forex Trading
When a trader looks at a forex quote, there are normally two prices: the bid and the ask. The difference between those two prices is called the spread.
Although a spread may appear small, it is an important part of the cost of trading forex. It can affect the price at which a position enters the market, the amount a trade needs to move before reaching breakeven, and the overall cost of frequent trading.
Understanding spreads is therefore essential for anyone trading currency pairs, particularly when comparing trading conditions, evaluating short-term strategies or assessing the potential cost of a position.
This guide explains what forex spreads are, how they work, why they change, how they affect trades, and what traders should consider when managing spread-related costs.
What Is a Forex Spread?
The spread is the difference between the bid price and the ask price of a currency pair.
The:
- Bid price is the price at which the market is willing to buy the base currency.
- Ask price is the price at which the market is willing to sell the base currency.
For example, suppose a hypothetical EUR/USD quote is:
Bid: 1.1050
Ask: 1.1052
The difference is:
1.1052 − 1.1050 = 0.0002
For EUR/USD, where one pip is generally 0.0001, this represents a 2-pip spread.The spread is therefore a measurement of the gap between the two available prices.
Why Does the Spread Exist?
Forex trading involves a marketplace in which different participants provide and seek liquidity.
The price available to a trader can reflect factors such as:
- Market liquidity
- Buying and selling activity
- Market volatility
- The currency pair being traded
- Time of day
- Economic announcements
- The trading provider’s pricing structure
The spread helps represent the difference between the prices available for buying and selling.In practical terms, a trader entering a position generally does not begin at exactly the same price at which the position could immediately be closed. The difference between the relevant bid and ask prices creates an initial trading cost.This is why a position can show a small unrealised loss immediately after opening, even when the market has not moved significantly.
Bid Price vs Ask Price
Understanding the two sides of a forex quote makes spreads much easier to understand.
Consider a hypothetical GBP/USD quote:
Bid: 1.2750
Ask: 1.2753
The spread is:
1.2753 − 1.2750 = 0.0003That equals 3 pips for this currency pair.If a trader buys at the ask price and immediately sells at the bid price, the difference represents the spread, before considering any other applicable costs or price changes.This is why traders should understand the quote rather than looking only at the chart’s displayed market price.
How Does the Spread Affect a Forex Trade?
The spread can affect a position from the moment it is opened.
Hypothetical example
Suppose a trader buys EUR/USD at an ask price of:
1.1002
The corresponding bid is:
1.1000
The spread is therefore:
2 pips
If the trader immediately closes the position, the position would be closed at the available bid rather than the original ask price, assuming the quoted prices have not changed.The market therefore needs to move sufficiently in the trader’s favour to overcome the initial spread before the position can generate a positive result from price movement alone.This is particularly important for short-term traders, because a larger proportion of a small expected price movement can be absorbed by transaction costs.
Fixed vs Variable Spreads
Forex spreads can generally be described as fixed or variable, depending on the pricing arrangement.
Fixed spreads
A fixed spread remains constant or is designed to remain within a specified structure under the relevant trading conditions.This can provide greater predictability in some circumstances.However, traders should not assume that a fixed spread means the overall cost of trading is always lower. Other costs and product conditions still need to be considered.
Variable spreads
Variable, or floating, spreads can change as market conditions change.They may become narrower when liquidity is strong and market conditions are relatively stable, but can widen when liquidity decreases or volatility increases.Variable spreads are common in many forms of electronic forex pricing.The exact spread structure depends on the product and trading provider.
Why Do Forex Spreads Change?
One of the most important things traders need to understand is that spreads are not necessarily constant.Several factors can influence them.
1. Market liquidity
Highly traded currency pairs generally have deeper market liquidity than less actively traded pairs.Greater liquidity can support tighter pricing, although the actual spread available to a trader depends on the provider and prevailing conditions.
2. Market volatility
When markets become volatile, prices can move rapidly and liquidity conditions can change.As a result, spreads may widen.
3. Economic announcements
Major economic releases, such as interest-rate decisions, inflation figures and employment data, can create significant changes in market activity.During such events, spreads may change as market participants adjust their pricing and risk.
4. Time of day
Liquidity varies throughout the global trading day.Periods when major financial centres are active can have different pricing conditions from quieter periods.
5. Currency pair
Major currency pairs, minor pairs and more thinly traded currency pairs can have different spread characteristics.Traders should therefore avoid assuming that the spread on one currency pair will apply to another.
Major, Minor and Exotic Currency Pairs
Spreads can differ considerably between currency pairs. Major pairs
Major currency pairs include combinations involving some of the world’s most actively traded currencies, such as:
- EUR/USD
- GBP/USD
- USD/JPY
- AUD/USD
- USD/CAD
These pairs often have substantial market liquidity, although their spreads can still change according to market conditions.
Minor pairs
Minor pairs combine major currencies without the US dollar, such as:
- EUR/GBP
- AUD/NZD
- EUR/AUD
Their pricing conditions can differ from those of major pairs.
Exotic pairs
Exotic currency pairs typically combine a major currency with a currency from a smaller or emerging market.These pairs can have different liquidity characteristics and may carry wider spreads.A trader should therefore consider the spread as part of the characteristics of the specific currency pair being traded.
Spread Cost and Position Size
The monetary impact of a spread depends partly on position size.Suppose a hypothetical EUR/USD trade has a spread of 2 pips.For a relatively small position, the monetary cost associated with those two pips will be relatively small.For a significantly larger position, the same 2-pip spread represents a larger monetary amount.This demonstrates an important principle:
A spread should always be considered together with position size.
A trader comparing two strategies should not simply ask which has the smaller spread. They should consider how the spread interacts with:
- Position size
- Trading frequency
- Expected price movement
- Stop-loss distance
- Take-profit distance
- Other trading costs
Spreads and Short-Term Trading
Spreads can be especially important for strategies that target small price movements.Suppose a hypothetical trader expects a currency pair to move only 5 pips.If the spread is relatively large compared with the expected movement, the trading cost can consume a significant portion of the potential price move.By contrast, a trader targeting a much larger movement may find that the same spread represents a smaller proportion of the anticipated price range.This does not mean that wider spreads automatically make a strategy unworkable. It means the spread should be considered in relation to the strategy’s expected movement and trading frequency.
Spreads and Scalping
Scalping generally involves attempting to capture relatively small and often short-term price movements.Because the expected price movement per trade may be small, transaction costs can become particularly important.For a hypothetical strategy targeting 5–10 pips per trade, even a few pips of spread can materially affect the economics of the trade.A trader considering a short-term strategy should therefore examine the actual pricing conditions applicable to the specific instrument and trading environment rather than assuming that a headline spread tells the entire story.
Spreads and Swing Trading
Swing traders generally aim to capture larger price movements over a longer period.In such circumstances, the spread may represent a smaller proportion of the expected price movement.However, that does not make the spread irrelevant.
A swing trader may still need to account for:
- Entry spread
- Exit spread
- Financing or holding costs where applicable
- Potential slippage
- Market gaps
- Volatility around major events
The overall cost of a trade should be considered rather than focusing on the spread alone.
Spread vs Commission
Not every forex trading arrangement uses exactly the same pricing structure.Some products or accounts may incorporate trading costs primarily through the spread, while others may involve a combination of a tighter spread and a separate commission.
For example, consider two hypothetical pricing structures:
| Trading arrangement | Spread | Commission |
| Model A | 2 pips | None stated |
| Model B | 0.5 pips | Separate commission |
It would be misleading to conclude that Model B is automatically cheaper simply because its spread is narrower.The trader needs to calculate the total cost of the transaction, including any applicable commission and other charges.This is particularly important when comparing trading providers or account types.
Spread and Slippage Are Not the Same
Another common misunderstanding is confusing spread with slippage. Spread ,The spread is the difference between the bid and ask prices available in the market.
Slippage
Slippage occurs when a trade is executed at a different price from the price expected or requested, depending on the execution circumstances.For example, a trader may place an order expecting one price, but rapid market movement may result in execution at another available price.Spread and slippage can both affect trading outcomes, but they represent different concepts.
Common Mistakes Traders Make With Spreads
1. Looking only at the advertised spread
The spread available at one moment may not represent conditions during every market environment.
2. Ignoring volatility
Spreads can change during periods of significant market movement.
3. Forgetting about trading frequency
A small cost repeated across a large number of trades can become meaningful over time.
4. Comparing spread without considering commissions
A narrow spread does not necessarily mean lower overall trading costs.
5. Ignoring position size
The monetary impact of a spread depends on exposure.
6. Trading during major announcements without understanding the risks
Economic events can produce rapid price movements and changing execution conditions.
7. Assuming the cheapest spread is always the best choice
Other factors, including execution conditions, product structure and applicable costs, can also matter.
How Can Traders Manage Spread-Related Costs?
Spreads cannot simply be eliminated, but traders can take them into account when planning their trades.A practical approach includes:
1. Understand the currency pair
Know the typical characteristics and liquidity of the pair being considered.
2. Check the actual trading conditions
Review the relevant pricing information rather than relying solely on general marketing descriptions.
3. Consider the time of day
Liquidity and spreads can vary throughout the trading session.
4. Be aware of major economic events
Important announcements can change both volatility and pricing conditions.
5. Consider total transaction costs
Include spreads, commissions and other applicable costs when evaluating a strategy.
6. Match the strategy to realistic price movements
A strategy targeting very small movements needs to account carefully for transaction costs.
7. Keep position sizes appropriate
A wider or narrower spread can have a very different monetary effect depending on the size of the position.
A Practical Spread-Analysis Checklist
Before entering a hypothetical forex trade, a trader can ask:
- What is the current bid price?
- What is the current ask price?
- How many pips is the spread?
- Is the spread normal for this market environment?
- Could an upcoming economic event affect pricing?
- What is the position size?
- Are there commissions or other applicable costs?
- How does the spread compare with the expected price movement?
- What happens to the trade if volatility increases?
- Is the potential risk acceptable before entering the position?
This approach helps traders treat spreads as part of the trading process rather than as an afterthought.
Key Takeaways
The most important points about forex spreads are:
- A spread is the difference between the bid and ask price.
- It is one of the costs associated with trading a currency pair.
- Spreads can be fixed or variable depending on the product and pricing arrangement.
- Market liquidity and volatility can influence spreads.
- Spreads can change around major economic announcements and during different trading conditions.
- The monetary impact of a spread depends on position size.
- Spreads are particularly relevant to short-term trading because expected price movements may be relatively small.
- A narrow spread does not necessarily mean the lowest overall trading cost.
- Commission, financing charges, slippage and other applicable costs may also need to be considered.
- Understanding spreads is an important part of responsible forex risk and cost management.