How Currency Pair Spreads Widen During News Events

When an economic data release hits the market, bid-ask spreads on currency pairs widen sharply, sometimes doubling or tripling in the seconds surrounding the announcement. This spread widening reflects the sudden uncertainty about fair value, the flood of orders, and the market maker’s need to protect against adverse price movement. Understanding why spreads blow out, how much the increase typically is, and when volatility settles helps traders budget for these temporary frictions.

Why Spreads Widen Around Announcements

A bid-ask spread is the difference between what a buyer will pay (bid) and what a seller will ask. In normal, liquid market conditions on major currency-pairs like EUR/USD, spreads are razor-thin—perhaps 1 to 2 pips (0.0001 in the forex quote convention). But the moment an economic surprise hits, spreads explode.

The widening happens because:

1. Uncertainty about fair value: Before the release, traders have a consensus view of where the pair should trade. The number comes in hotter or colder than expected, and suddenly no one is sure what the “correct” price is. Market makers widen spreads to avoid being picked off by traders who know more than they do.

2. Explosive volume and imbalance: A major release can trigger thousands of orders within milliseconds. If the news is a dollar strengthen, buy orders for USD flood the market and sell orders for USD collapse. Market makers, overwhelmed by one-way flow, widen spreads to slow down that flow and protect their inventory.

3. Hedging uncertainty: A market maker who is long EUR/USD when a hawkish Fed decision hits suddenly wants out. The risk of holding that position at an outdated price is enormous. The bid-ask spread widens to compensate for that heightened risk.

Spread Size: Before, During, and After

A useful snapshot comes from watching a major-currency pair through a news event.

Pre-announcement (last 10–30 seconds before release):
Spreads often narrow sharply as traders who believe they have strong convictions take positions ahead of the surprise. This creates a “tightening squeeze” that can feel deceptively tight—a false signal of liquidity.

At announcement:
The data hits. EUR/USD normally trades with a 1-pip spread. Within one tenth of a second, the spread widens to 5, 10, or even 15 pips on an exceptionally volatile surprise. At this moment, a trader trying to execute an order pays dearly. A buy order that would have filled at the 2-pip spread now faces a 10-pip spread; the effective cost has jumped.

Post-announcement (10–60 seconds after release):
Traders begin re-equilibrating positions. The initial directional shock fades, one-way order flow subsides, and market makers gain confidence in the new “fair value.” Spreads narrow, but usually not all the way back to pre-announcement levels. A return to 3–4 pips on EUR/USD is typical; the full 1-pip tightness may take minutes to return.

Major Pairs vs Minor Pairs

The magnitude of spread widening depends on the pair’s liquidity.

Major pairs (EUR/USD, GBP/USD, USD/JPY, USD/CHF, AUD/USD, USD/CAD, NZD/USD) have deep, continuous liquidity. Even during major news, they remain reasonably tradeable. EUR/USD might widen from 1 pip to 5–8 pips around a European Central Bank decision, but order flow is still fast and depth is present.

Minor pairs (EUR/GBP, EUR/JPY, GBP/JPY, cross-rates between minors) are less liquid. Their normal spreads are already wider—3 to 10 pips. During news, they can widen to 20–50 pips or more, and depth evaporates. A trader waiting to sell a large EUR/GBP position may find almost no bids, forcing them to wait until normal conditions resume or to accept a far worse price.

Emerging-market pairs (USDZAR, USDMXN, USDBRL) are even more illiquid. Spreads can explode to hundreds of pips around major news, and the pair may barely trade at all during the shock.

Which News Events Trigger the Biggest Blowouts

Not all data releases have equal impact. Scheduled releases are priced in more gradually; surprise outcomes cause sharper spread widening.

High-impact releases (typically trigger 5–15 pip widening on EUR/USD):

• Federal Reserve decisions and press conferences: The policy rate and forward guidance move markets sharply.
• Employment data (U.S. Nonfarm Payrolls, Eurozone unemployment): Labor markets drive currency valuations.
• Inflation data (CPI, core CPI, PCE): Central bank mandate and rate path expectations.
• GDP releases: Quarterly growth data shifts long-term growth expectations.
• Central bank monetary policy decisions: ECB, Bank of England, Bank of Japan, Reserve Bank of Australia all trigger volatility.

Moderate-impact releases (typically 2–5 pip widening):

• Retail sales, manufacturing PMI, services PMI: Consumption and production signals.
• Building permits, housing starts, industrial production: Sector-specific demand signals.

Low-impact releases (typically minimal spread change):

• Consumer sentiment, conference board leading index: Forward-looking but less market-moving.

The surprise matters more than the number itself. If nonfarm payrolls come in at +250,000 when economists expected +250,000, spreads may barely budge. If the actual print is +150,000 (a large miss to the downside), spreads can widen 10+ pips as traders reprice recession risk.

How to Estimate Spread Costs

A trader who enters a position during a news event must account for the spread as a trading cost.

Example: EUR/USD normally trades 1 pip wide. An economic surprise hits, and the spread widens to 8 pips. A trader buys EUR/USD during the spike and closes the position 10 minutes later when spreads have normalized to 2 pips.

• Entry cost: 8-pip spread (buyer pays the ask)
• Exit cost: 2-pip spread (seller pays the bid)
• Total spread cost: 10 pips in round-trip friction

On a position of 1 million euros, that is 1 million × 0.0010 = $1,000 in round-trip spread cost, separate from any adverse price movement.

Professional traders know to either:

1. Avoid trading during news: Stay flat or exit positions well before scheduled releases.
2. Use limit orders instead of market orders: A limit order to buy EUR/USD at a maximum price avoids being hit by the worst of the spread spike, but risks not filling if the pair moves past the limit price.
3. Scale into and out of positions: Rather than entering 1 million at once during a spike, enter 250,000 on four separate dips as spreads narrow incrementally.

Spread Mechanics: What Market Makers Do

Market makers in forex (banks, brokers, dealing desks) are the entities widening spreads. Their goal is not malice; it is survival. When an economic release is imminent, a market maker faces asymmetric information: traders with strong convictions are more likely to hit the bid or lift the ask, while uncertain traders fade. The market maker widens the spread to increase their expected profit per trade and to slow down one-way order flow.

During a sharp dollar-rally announcement, dollars are offered at lower prices (bid falls) and demanded at higher prices (ask rises). The spread widens. If the market maker has inventory (is long EUR/USD), they will offer to sell at any price to exit the position, further widening the spread. Once they have exited and rebalanced, they tighten back up.

This is why spreads are widest at the moment of the announcement and tightest in calm, non-news periods. The bid-ask-spread is a direct reflection of the market’s uncertainty.

Preparing for News Events

Sophisticated traders plan around spread widening:

• Economic calendar: Maintain a calendar of major releases and their typical market impact.
• Avoid news windows: Don’t hold large open positions into high-impact announcements.
• Pre-position: If you expect a direction (e.g., a hawkish Fed decision will strengthen the dollar), enter a portion of that position well ahead of the announcement, locking in normal spreads.
• Use options for protection: If you must be exposed during news, a protective-put or call-option can cap your loss while avoiding the spread explosion of closing a spot position.

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