A spread in trading is simply the difference between two prices. What that difference means depends on what you are trading and how you measure it. The word "spread" shows up in markets the same way "margin" does. You hear it in different contexts, and they all mean something slightly different. Get the wrong one and your P&L will tell you before your broker does.
Bid-Ask Spread: The Cost of Getting In
Every trade has two prices. The bid is the highest price a buyer will pay right now. The ask is the lowest price a seller will accept. The gap between them is the bid-ask spread. You pay the ask when you buy. You receive the bid when you sell. That gap is your cost to execute. A liquid stock like Apple might have a spread of a penny or two. An illiquid micro-cap could have a spread of 10 or 20 cents. The spread is wider when volume is low or volatility is high. Day traders care about this because a wide spread eats into every round trip. Swing traders care less because they hold longer. But everyone should know the number before they hit the button.
Spread in Forex: Pips as the Unit
Forex traders talk about spreads in pips. A pip is the smallest price move in a currency pair, usually the fourth decimal place. EUR/USD at 1.1050 moving to 1.1051 is a one-pip move. The spread on a major pair like EUR/USD might be 0.6 to 1.2 pips with a retail broker. Exotic pairs like USD/TRY can have spreads of 20 pips or more. The spread is the broker's fee for routing your trade. Some brokers advertise zero commissions and widen the spread instead. Others charge a fixed commission per lot and offer raw spreads from interbank markets. You want to know which model you are using because a 1.5-pip spread on a 10-lot order costs more than a 0.3-pip spread with a $7 commission.
Spread in Options: Bullish or Neutral
An options spread is a strategy, not a cost. You buy one option and sell another in the same expiration cycle. A bull call spread means buying a lower-strike call and selling a higher-strike call. Your maximum profit is the distance between strikes minus the net premium paid. Your maximum loss is the net premium. The idea is to cap both risk and reward. A credit spread works in reverse. You sell an option for a premium and buy a further out option for protection. The net credit is your max profit. The distance between strikes minus that credit is your max loss. Options spreads let you define risk before the trade starts. Beginners sometimes overlook the width of the strikes. A 5-point spread on a $200 stock has different risk than a 50-point spread. The Greeks matter too. Vega and gamma behave differently depending on how close your strikes are to the current price.
Spread Betting: The UK Tax Wrapper
Spread betting is a UK-based product where you bet on a price move without owning the asset. Each point the market moves translates to a fixed cash amount per unit. If you bet £10 per point on the FTSE 100 and it rises 50 points, you make £500. If it falls 50 points, you lose £500. Spread betting is a contract for difference (CFD) in disguise. It is leveraged. A small margin deposit controls a larger position. The upside is tax-free in the UK because it counts as gambling, not investing. The downside is that leverage cuts both ways. A 2% move against you can wipe out your margin if you choose the wrong position size. Brokers offer fixed spreads or variable spreads. Fixed is predictable. Variable can widen during news events and trigger stop-losses at worse prices.
The Leverage Trap
Every spread product mentioned above has a leverage component. Bid-ask spreads on leveraged ETFs get wider because the underlying derivatives rebalance daily. Forex trades on margin, so the spread cost compounds with position size. Options spreads use leverage by design. Spread betting is pure margin. A beginner sees a 0.1 pip spread and thinks cost is low. But that spread is multiplied by the leverage ratio. Trade ten standard lots in forex and a 1-pip spread costs $100. Trade with 50:1 leverage on a $2,000 account and a 1% adverse move hits the margin call. The spread is not the risk. The position size relative to capital is the risk. The spread just makes that risk more expensive to exit.
A Practical Scenario
Say you want to trade GBP/USD with a broker that offers 1.0-pip spreads. The current price is 1.2750 bid and 1.2751 ask. You buy one standard lot at 1.2751. Price moves to 1.2761, a 10-pip gain. Your gross profit is $100. But you already paid $10 in spread entering. Net profit is $90. If the broker instead charged 0.1 pips raw spread plus $7 commission per lot, your entry cost would be $1 plus $7 commission, or $8. You keep $92 of the $100. The second model is better for active traders. The first is simpler for beginners. Know the math before you pick a broker.
The Rule of Thumb
For stocks: a 2% or smaller bid-ask spread relative to price is acceptable for most swing traders. For forex: spreads under 2 pips on majors are standard. For options: vertical spreads should have risk you can define in dollars, not percentages. For spread betting: the minimum tick size and the cash amount per point matter more than the spread itself. Write down the cost per trade in dollars before you place it. If that number feels large, reduce your position size.
Prepared with AlphaScala editorial tooling, examples, and risk-context checks against our education standards. General education only, not personalized financial advice.