Every liquid market you trade quotes two prices at once. The bid is what buyers are willing to pay right now. The ask (sometimes called the offer) is what sellers are willing to accept. The bid–ask spread is the gap between them. That gap is a cost of doing business, paid when you open and again when you close.
UK beginners often hear “the spread” as a broker marketing phrase. The bid–ask concept is older and broader. It exists on FX dealers, index CFDs, shares, and futures. Understanding it stops the surprise when your entry fills slightly worse than the mid-price on the chart.
What You See on the Screen
Suppose GBP/USD shows a bid of 1.3480 and an ask of 1.3482. If you buy (go long), you typically deal at the ask: 1.3482. If you sell (go short), you typically deal at the bid: 1.3480. Instantly, a two-pip gap sits against you. Price must move in your favour by that amount before you are even flat on the quote.
The mid-price — halfway between bid and ask — is what many charts emphasise. Your fill is not the mid. Trading from the mid in your head systematically overstates how good the idea was.
For a deeper walk through broker language around costs, see our guide to what a spread is in trading. This piece focuses on the mechanics of the two-sided quote itself.
Why the Gap Exists
Market makers and liquidity providers take inventory risk. They buy at the bid and sell at the ask, earning the spread if both sides trade and prices stay stable. When news hits, books thin, or London lunch empties the FX desk, they widen the ask above the bid to protect themselves. You experience that as a larger cost to enter or exit.
Tight spreads usually signal deeper liquidity. The London–New York overlap is a classic example for major FX pairs: more participants, deeper books, often narrower gaps. Quiet Asian hours on sterling can look the opposite.
Wide spreads are not always “your broker cheating”; sometimes they are the honest price when nobody wants the other side.
Spread Versus Slippage Versus Commission
Keep three ideas separate. The bid–ask spread is the standing gap between buy and sell quotes. Slippage is the difference between the price you expected and the fill you got when the book moved. Commission is an explicit fee on top. Some UK accounts wrap costs into a wider spread; others show a tighter spread plus commission. Comparing “raw” numbers without matching the fee model misleads beginners.
Around UK data or US payrolls, both spread and slippage can jump together. That is why many plans shrink size or stand aside into the print — not because the chart looks boring, but because the cost of being wrong rises.
How Beginners Should Use the Idea
Treat the spread as part of risk, not as background noise. If your edge on a scalping idea is two pips and the spread is two pips, you are not trading an edge; you are sponsoring the quote. Swing ideas with larger stop distances absorb the same spread more easily in percentage terms — which is one reason short-hold strategies die first for new traders.
Check typical spreads on the pairs and indices you actually trade at the hours you trade them. GBP/USD at 08:30 London is not the same product as GBP/USD at 22:00. FTSE CFDs near the cash open can behave differently from mid-afternoon. Write the observation into the plan: preferred session, maximum acceptable spread, action if the quote is abnormally wide.
A free traders assessment can help show whether small winners are being eaten by costs rather than by “bad analysis”.
What the Spread Does Not Tell You
A tight spread does not mean the next trade will win. It means the cost of entry is low relative to a wider market. Plenty of losing ideas fill at excellent prices. Plenty of winning ideas fill through a messy book. Cost discipline improves expectancy; it does not replace a stop-loss or a defined thesis.
Conclusion
The bid is the buy-side quote; the ask is the sell-side quote; the spread is the gap — a real cost paid on the round trip. UK beginners should watch how that gap behaves across London hours and news, separate it from slippage and commission, and refuse setups whose expected move cannot clear the cost. Charts show mid-price stories. Accounts settle at the bid and the ask.
