Why do forex spreads widen and tighten?

Why do forex spreads widen and tighten?

Reading time: 9 minutes

Forex spreads don’t stay the same throughout the day. You might see a tight spread on EUR/USD during an active trading session, only for it to widen around an economic announcement or when fewer traders are in the market. This change can affect your trading results. A wider spread generally means a higher cost to enter a trade, while a tighter spread usually means a lower cost, all else being equal.

This is why traders usually learn why forex spreads widen or tighten. Several factors can affect spreads, including liquidity, volatility, trading hours and broker pricing. Knowing what to look out for won’t prevent spreads from changing, but it can help you make better-informed trading decisions.

What are forex spreads?

The spread is the difference between the bid price, at which you can sell, and the ask price, at which you can buy a currency pair. For example, if EUR/USD has a bid of 1.08500 and an ask of 1.08510, the spread is 0.00010, or one pip. If the ask rises to 1.08520 while the bid stays at 1.08500, the spread doubles to two pips.

The spread is one component of trading costs. Depending on the account and broker, traders may also pay commissions and overnight financing charges.

Why do forex spreads widen?

The factors that cause spreads to widen depend on the currency pair, market conditions and the broker’s pricing model. The most common factors affecting spreads include:

Lower market liquidity

Liquidity measures how easily traders can buy or sell without significantly affecting an asset’s market price. When many participants are active, competing quotes can help keep spreads narrow. When market liquidity declines, finding a suitable price may become harder. Liquidity providers may respond by quoting a wider spread to account for the additional risk and cost of executing trades. This is one reason major pairs such as EUR/USD often have tighter spreads than less frequently traded exotic pairs. However, conditions vary, and even a major pair can become expensive to trade when liquidity deteriorates.

Economic news and major announcements

Interest rate decisions, inflation figures, employment reports and central bank statements can quickly alter expectations about a currency’s outlook. Suppose a US CPI inflation report comes in well above forecasts. Traders may revise their expectations for Federal Reserve (Fed) policy, triggering sharp price movements in US dollar pairs. Liquidity providers may widen their quotes while the market absorbs the news.

Spreads can increase before an announcement, immediately afterwards or during the subsequent price move. The response depends on how surprising the data is and how the market reacts. This is why experienced traders usually monitor the economic calendar to stay updated on important economic releases associated with the currency pair they are trading.

However, not every announcement leads to wider spreads. Some releases produce little reaction, particularly when the results broadly match expectations.

Higher market volatility

Volatility refers to the extent of price movements over a period. When prices move sharply, quotes can become outdated quickly, increasing the risk faced by liquidity providers. They may then widen spreads to account for this uncertainty. The effect can be particularly noticeable when prices jump between available quotes, or the market struggles to establish a clear direction.

High volatility doesn’t always mean wider spreads. Strong liquidity and active competition among price providers can help maintain tighter spreads, even during periods of significant price movements.

Market openings, closings and rollover

Although the forex market operates around the clock during the trading week, activity varies across sessions. Spreads can be more competitive when major financial centres overlap and participation is high, while widening during quieter periods, near the end of the trading week or around a broker's daily rollover.

Rollover involves carrying an open position into the next trading day. Pricing conditions can change around this time, depending on the instrument and broker. Rather than assuming one trading hour is always best, traders typically monitor spreads on their chosen pair and compare conditions across sessions.

Geopolitical events and unexpected shocks

Wars, political crises, trade restrictions and unexpected policy changes can trigger sudden shifts in currency demand.

Traders may move towards currencies they consider safer, while reducing exposure to others. The resulting price moves and changes in available liquidity can lead to wider spreads. However, high turnover does not guarantee tight spreads at every moment. Pricing still depends on the currency pair and conditions when a trade is placed.

Why do forex spreads tighten?

Forex spread tightening generally occurs when market conditions support more competitive quotes. Factors that can contribute to this are:

• Higher liquidity: More active buyers and sellers can make it easier to match orders, encouraging competitive pricing.
• Greater certainty: Once markets have absorbed an announcement and prices become less erratic, spreads may narrow.
• Active trading sessions and session overlaps: Major currency pairs often have tighter spreads when key financial centres are active simultaneously. For example, the London–New York session overlap typically brings greater liquidity to pairs such as EUR/USD, although spreads can still widen during major news events or periods of market uncertainty.

These conditions can help reduce trading costs, but they do not guarantee a particular spread. Traders generally check the live quote before placing an order.

How do changing spreads affect trading costs?

A wider spread increases the initial cost of entering a position. This can matter especially to scalpers and other short-term traders, whose targets may be relatively small. Consider a EUR/USD trade of one standard lot, representing 100,000 euros. Assuming the account is denominated in US dollars, the pip value is approximately $10.

These figures illustrate the spread cost at entry, assuming the quoted spread applies to the order. They exclude commissions, slippage and other charges. Actual costs depend on the instrument, position size and execution price. Spreads can also affect pending orders and stop-loss orders. Depending on the order type, a change in the relevant bid or ask price may trigger an order earlier than expected. During fast markets, a stop-loss may execute at a different price from the level requested.

How do spreads affect CFD trading?

Spreads are particularly important when trading Contracts for Difference (CFDs) with leverage. Leverage allows you to open a position with a smaller deposit, known as margin, than the full market exposure. However, the spread is still a trading cost, and it can have a greater impact on your account when you trade with leverage.

For example, suppose you open a CFD position with a market exposure of $10,000 using 10:1 leverage. The required margin would be $1,000, assuming that margin rate applies. If the spread widens, your position may start further in the red because the difference between the buying and selling prices has increased. That initial loss reduces your available equity, leaving less room to absorb adverse price moves. If your account equity falls towards the broker’s margin close-out threshold, you may face a margin call or have positions closed, depending on the broker’s rules and applicable regulations.

Understanding these risks is important when calculating potential returns and setting position sizes.

How can traders prepare for changing spreads?

Traders cannot prevent market spreads from changing, but they can take practical steps to manage the impact.

• Check the economic calendar. Identify important releases affecting the currencies you trade. Consider whether opening a position just before an announcement fits your strategy.
• Monitor live pricing. Compare spreads across trading sessions and market conditions instead of relying only on a broker’s advertised minimum.
• Choose forex pairs carefully. Major pairs often offer more competitive pricing than exotic pairs, but check the actual conditions for your chosen instrument.
• Calculate total trading costs, including spreads, commissions and applicable overnight financing when evaluating a strategy.
• Avoid forcing trades. If spreads rise sharply or prices become difficult to follow, consider waiting until conditions better suit your strategy.
• Experienced traders also tend to use appropriate position sizing. They account for transaction costs when setting risk limits and deciding how much to trade.
• Your broker’s pricing model also matters. Fixed spreads are designed to remain constant under specified conditions, subject to the broker’s terms. Variable spreads move with market conditions and may widen during periods of reduced liquidity or increased volatility.

Build spread awareness into your trading plan

Spreads are a normal part of forex trading, but their cost can change with market conditions. Knowing why forex spreads widen can help traders identify periods when entering a position may become more expensive. Recognising the conditions that support tighter spreads can be equally useful, although no spread level is guaranteed.

FP Markets offers multiple trading platforms, a range of trading instruments and educational resources to help traders develop their market knowledge. The global broker also supports traders with tight spreads and fast execution. Open an account to explore how spreads affect trading.