What Is a Spread in Trading? Types of Spreads Explained

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A spread is the difference between two related prices, rates or yields. In trading, the word almost always means the bid-ask spread: the gap between the highest price a buyer is currently willing to pay (the bid) and the lowest price a seller is currently willing to accept (the ask, or offer). If EUR/USD is quoted at 1.08500 / 1.08512, the spread is 0.00012, or 1.2 pips. That gap is a trading cost. A position opened at the ask and closed at the bid loses the full spread even if the market does not move.

The word has other meanings too: yield spreads between bonds, lending spreads between a loan rate and the cost of funds, and options or futures spreads built from two or more related positions. Each compares two numbers. What changes is which two and what the gap tells you.

What Is a Spread?

A spread compares two linked values, such as the buying and selling price of the same asset, the yields of two bonds, two futures contract months, or a loan rate against a benchmark. The general formula is simple:

Spread = Value A − Value B

The interpretation depends on the context:

• Bid-ask spread: Ask price − Bid price. It measures the cost of an immediate round trip and the liquidity of the market.
• Yield spread: Yield of bond A − Yield of bond B. It measures the extra return one bond pays, usually as compensation for risk, maturity or liquidity.
• Lending spread: Loan rate − Benchmark rate or cost of funds. It measures the lender’s margin and the borrower’s risk premium.
• Options spread: Price of one option − Price of another (net debit or credit). It measures the cost or income of a combined position.
• Futures or calendar spread: Price of contract A − Price of contract B. It measures the market’s pricing of time, storage, carry or the relationship between related commodities.

The first step in reading any spread figure is therefore to identify the two values being compared and the unit: dollars, pips, ticks, percentage points or basis points.

The Bid-Ask Spread: How It Works

Most actively traded assets trade in a two-sided market. At any moment there is a best bid and a best ask. A trader who wants to buy immediately pays the ask. A trader who wants to sell immediately receives the bid. The spread is the price of that immediacy.

Calculating the Bid-Ask Spread

There are three common ways to express it.

Absolute spread: Spread = Ask − Bid

Midpoint (mid price): Mid = (Bid + Ask) ÷ 2

Percentage spread (relative to the midpoint): Percentage spread = (Ask − Bid) ÷ Mid × 100

The percentage form matters when you compare assets with very different prices. A five-cent spread on a $25 stock is a much larger cost than a five-cent spread on a $500 stock.

Hypothetical example: A stock is quoted at $25.00 bid and $25.05 ask.

• Absolute spread: $25.05 − $25.00 = $0.05
• Midpoint: ($25.00 + $25.05) ÷ 2 = $25.025
• Percentage spread: $0.05 ÷ $25.025 × 100 ≈ 0.20%

Buying 1,000 shares at the ask and selling them straight back at the bid would cost $50 before commissions. The same round trip on a stock quoted at $150.00 / $150.01 would cost $10, a percentage spread of about 0.0067%.

Who Earns the Spread

Market makers and dealers stand ready to buy at their bid and sell at their ask, capturing the difference when they do both repeatedly. That margin pays them for providing liquidity and for the risk of holding inventory while prices move. High-frequency market makers capture very small spreads across a large number of trades.

In retail forex and CFD trading, the broker either acts as the counterparty or passes orders to liquidity providers. Either way, the spread is commonly its main revenue on a trade, sometimes alongside a separate commission, and the broker may add a markup to the spread it receives from its liquidity providers before quoting clients.

What Makes Spreads Wide or Narrow

Several forces push spreads in one direction or the other:

1. Trading activity and depth. More competing buyers and sellers mean tighter quotes. Heavily traded large-cap stocks and major currency pairs usually show tighter spreads than small caps or exotic pairs.
2. Volatility. When prices move quickly, dealers risk the market moving against them before they can offset a trade, so they quote wider.
3. Time of day. Liquidity varies through the day. In forex, quotes are typically thinner around the daily rollover and when major financial centers are closed.
4. Information risk. Ahead of earnings, central bank decisions or major economic releases, dealers widen spreads because one side of the market may be better informed.
5. Minimum price increments. In U.S. stocks, the minimum quoting increment for shares priced at $1 or more has long been one cent, which sets a floor on the quoted spread.
6. Broker pricing model. Two brokers quoting the same pair can show different spreads because of different liquidity sources, markups and account types.

A spread is therefore both a cost and a signal. A suddenly widening spread tells you that liquidity has thinned or uncertainty has risen, even before price itself has moved much.

Spreads in Forex Trading

Forex quotes are always two-sided. The bid is the price at which you can sell the base currency, and the ask is the price at which you can buy it. Because most currency pairs are quoted to four or five decimal places, the spread is normally expressed in pips rather than in money.

Pips, Pipettes and Spread Cost

For most pairs, one pip is the fourth decimal place (0.0001). For pairs quoted against the Japanese yen, it is the second decimal place (0.01). Many platforms quote one extra digit, a fractional pip or “pipette,” which is why spreads such as 1.2 or 0.8 pips appear.

To convert a spread into a cost in money:

Spread cost = Spread in pips × Pip value per lot × Number of lots

For a pair where the U.S. dollar is the quote currency (such as EUR/USD), one pip on a standard lot of 100,000 units is worth $10. On a mini lot (10,000 units) it is $1. On a micro lot (1,000 units) it is $0.10.

Worked Example: The Cost of a Forex Spread

Hypothetical quote: EUR/USD 1.08500 bid / 1.08512 ask. The spread is 1.08512 − 1.08500 = 0.00012, or 1.2 pips.

• 1 standard lot: 1.2 × $10 = $12
• 1 mini lot: 1.2 × $1 = $1.20
• 1 micro lot: 1.2 × $0.10 = $0.12

Suppose you buy one standard lot at 1.08512. The moment the trade opens, your position is valued at the bid, 1.08500, so it shows an open loss of $12. If the spread stays at 1.2 pips, the bid has to rise to 1.08512 (the mid price has to rise 1.2 pips) before the trade breaks even. Selling works the same way in reverse. You enter at the bid and close by buying back at the ask.

The spread is crossed once over a full round trip: roughly half on entry and half on exit relative to the mid price, or the full spread if you measure entry at the ask against exit at the bid. Commissions work differently. Brokers often quote them per side (charged on opening and again on closing) or per round turn (one charge covering both), and mixing up the two bases can double or halve your cost estimate.

For pairs where the dollar is not the quote currency, the pip value has to be converted. Hypothetical example: USD/JPY at 150.250 / 150.268 has a spread of 1.8 pips. One pip on a standard lot is 0.01 × 100,000 = ¥1,000. At an exchange rate of about 150.27, that is roughly $6.65 per pip, so the spread costs about 1.8 × $6.65 ≈ $11.97 per standard lot.

Fixed, Variable and Raw Spreads

Retail brokers generally price in one of three ways:

• Fixed spreads stay at a set number of pips under normal conditions, making costs predictable. Brokers may still widen quotes, requote or reject orders in extreme conditions, depending on their terms.
• Variable (floating) spreads move with market conditions: tighter than fixed spreads in quiet, liquid periods and much wider during news events or thin sessions.
• Raw or ECN-style spreads plus commission pass through a tighter underlying spread and charge a separate commission per lot.

To compare a raw-spread account with a spread-only account, convert everything to one cost per round trip. Hypothetical example: a raw spread of 0.2 pips on EUR/USD plus a commission of $3.50 per side per standard lot.

• Spread cost: 0.2 × $10 = $2.00
• Commission: $3.50 × 2 sides = $7.00
• Total round trip: $9.00, equivalent to 0.9 pips

On those assumptions, the raw account is cheaper than a spread-only account quoting 1.2 pips ($12) and more expensive than one quoting 0.8 pips ($8). The comparison only holds for the spread levels actually in effect when you trade, which for variable pricing changes throughout the day.

When Forex Spreads Widen

Major pairs such as EUR/USD, USD/JPY and GBP/USD typically carry the tightest spreads because they are the most heavily traded. Minor crosses tend to be wider, and exotic pairs (a major currency against the currency of a smaller or emerging economy) wider still. On any pair, spreads can widen sharply:

• Around scheduled releases such as central bank rate decisions, inflation data and employment reports
• Around the daily rollover, when many liquidity providers pause or reprice
• At the weekly open after the weekend, when prices may gap
• During unexpected events that cause liquidity providers to pull quotes

Spread widening hits short-term traders hardest. A scalper aiming for a few pips per trade can see most of the expected gain absorbed by a spread that doubles at the wrong moment. A position trader targeting hundreds of pips barely notices the same change.

How the Spread Affects Stops, Limits and Margin

Most charting platforms draw candles from bid prices by default. Long positions close at the bid, so a long position’s stop-loss or take-profit triggers when the bid reaches the level, which you can see on a bid chart. Short positions close at the ask. Their orders trigger when the ask reaches the level, and the ask sits above the bid by the spread.

Hypothetical example: You are short EUR/USD with a stop-loss at 1.08600. With a 1.2-pip spread, the stop triggers when the bid reaches 1.08588. If the spread widens to 5 pips during a news release, the stop triggers when the bid reaches 1.08550. On a bid-only chart, it can look as if price never touched your stop. Placing stops on short positions a little further away, or displaying the ask line on the chart, accounts for this.

A trigger price is also not a fill price. A triggered stop typically becomes a market order and, in fast markets, can fill worse than the stop level. That gap is slippage, a separate cost from the spread.

Spreads also affect account equity. Open positions are marked to the price at which they would close, so a sudden widening reduces floating profit or deepens floating loss on every open trade at once. For an account running close to its margin limits, that drop in equity can be enough to trigger a margin call or a stop-out, even if the mid price has barely moved.

Stock Market Spreads

Bid-Ask Spreads in Stocks

Stock quotes work the same way: a best bid, a best ask and a spread between them. In the United States, the best displayed bid and ask across exchanges form the National Best Bid and Offer (NBBO), the reference quote that brokers use when routing orders.

The spread varies widely from one stock to the next. A heavily traded large-cap stock can trade with a spread of a single cent, the minimum increment. A thinly traded small-cap stock might show $10.00 bid and $10.50 ask. That 50-cent gap is about 4.9% of the midpoint, so the stock would have to rise nearly 5% just to break even on an immediate round trip. Wide stock spreads usually come with lower trading volume, larger price swings per trade and higher transaction costs.

Two practical points follow. First, limit orders let you control the price you pay or receive. A buy limit placed between the bid and ask may fill at a better price than the current ask, though it may not fill at all. Second, “commission-free” trading does not remove the spread. You still buy at the ask and sell at the bid, and execution quality (how close your fill is to the midpoint) becomes part of your real cost.

The spread is also why paper results can flatter a strategy. Backtests and simulators that fill every order at the last traded price or the midpoint understate what a live trader pays.

Price Spreads Between Securities

“Spread” can also describe the price gap between two different but related securities. Examples include:

• Share classes: Class A and Class B shares of the same company may trade at different prices because they carry different voting rights. The gap reflects how much the market values control.
• Common vs. preferred stock: the gap reflects their different claims on dividends, assets and growth.
• Pairs trading: traders buy one stock and short a closely related one, betting that an unusual gap between them will narrow. The position profits from the change in the spread, not the market’s direction.

When a price gap between related instruments allows a locked-in profit after costs, the trade moves into arbitrage. In practice, the bid-ask spreads on both legs are often what separates an apparent opportunity from a real one.

Bond Market Spreads

In fixed income, spreads compare yields rather than prices. They are usually expressed in basis points (bps). One basis point equals 0.01 percentage point, so a 1.5-point yield difference is 150 bps. A wider spread means investors are being paid more extra yield to hold one bond instead of the other.

Yield Spreads

A yield spread is the difference between the yields of two bonds that differ in maturity, issuer, credit quality or type.

A widely watched example is the yield curve spread between long-term and short-term government bonds, such as the 10-year Treasury yield minus the 2-year Treasury yield. Normally, longer maturities yield more, so the spread is positive. When short-term yields rise above long-term yields, the spread turns negative and the curve is said to be inverted.

Hypothetical example: a 2-year Treasury at 4.50% and a 10-year Treasury at 4.00% give a 10-year minus 2-year spread of −0.50 percentage point, or −50 bps.

A steepening curve is often associated with expectations of stronger growth or higher future inflation. Flattening and inversion are associated with slower growth and future rate cuts. In the United States, inversions have preceded many past recessions, a historical pattern rather than a rule with fixed timing.

Credit Spreads

A credit spread compares two bonds of similar maturity but different credit quality. Most often it is a corporate bond measured against a government bond treated as risk-free, such as a U.S. Treasury.

Hypothetical example: a 10-year Treasury yields 4.00%, and a 10-year bond from Company XYZ yields 5.50%. The credit spread is 1.50 points, or 150 bps. That extra yield compensates investors for the chance that XYZ defaults, and for other differences such as liquidity.

Credit spreads widen when investors perceive more default risk, because of a downgrade, weaker company results or fear of a broader downturn, and narrow when confidence returns. During the 2008 financial crisis, they widened dramatically. Because they move with sentiment as well as fundamentals, they are watched as a real-time gauge of credit stress. A company whose bonds trade at a wider spread than peers of similar maturity is paying more to borrow, which usually reflects greater perceived credit risk, lower liquidity in its bonds, or both.

Liquidity Spreads

A liquidity spread is the yield difference between two otherwise similar bonds that differ in how easily they can be traded. Investors require more yield to hold a bond that is hard to sell quickly without accepting a lower price, so liquidity spreads tend to widen in stressed markets and narrow when conditions calm. In practice, credit and liquidity effects are mixed together in a bond’s total spread.

Swap Spreads

The swap spread is the difference between the fixed rate on an interest rate swap and the yield on a government bond of the same maturity. In a plain swap, one party pays a fixed rate and receives a floating rate tied to a benchmark such as SOFR in the U.S., so the swap rate reflects interbank funding and counterparty conditions. A widening swap spread can signal rising concern about counterparty risk, the chance that the other side of a contract fails to pay. Supply, demand and regulation in the Treasury and swap markets also move swap spreads, and at some maturities they have turned negative.

Z-Spread

A simple yield spread compares one yield with another at a single maturity. The Z-spread (zero-volatility spread) is more precise. It is the constant spread that, added to every point of the Treasury spot (zero-coupon) curve, makes the present value of a bond’s cash flows equal to its market price.

Hypothetical example: a corporate bond with a $100 face value and a 5% coupon trades at $105. If the spread that equates its discounted cash flows with $105 is 1.5%, the Z-spread is 150 bps. Across the whole Treasury curve, the bond offers 150 bps of extra yield for credit risk, liquidity and other factors.

Because it uses the full curve rather than one benchmark yield, the Z-spread suits bonds with uneven cash flows and helps compare relative value among bonds of similar credit quality but different structures.

Option-Adjusted Spread (OAS)

Many bonds contain embedded options: a callable bond lets the issuer repay early, a putable bond lets the investor demand early repayment, and mortgage-backed securities carry prepayment risk. The Z-spread treats cash flows as fixed, so it blends the value of these options into the spread.

The option-adjusted spread strips out the option’s value. Using a model of how rates might move and how the option would be exercised, it estimates the spread over the risk-free curve if the bond had no embedded option.

• For a callable bond, the call option benefits the issuer, so the investor is effectively short an option. The OAS is lower than the Z-spread.
• For a putable bond, the investor holds the option, so the OAS is higher than the Z-spread.

Hypothetical example: a 10-year callable bond with a 6% coupon, callable after five years, shows a Z-spread of 2.0%. After deducting the value of the issuer’s call option, the OAS might be 1.5%. The 0.5-point difference comes from the call feature rather than from credit or liquidity. OAS lets investors compare bonds with different option features on a like-for-like basis, but its accuracy depends on the rate and prepayment models behind it, and different models can give different OAS figures for the same bond.

Lending and Banking Spreads

In lending, a spread is the margin between the rate a borrower pays and a benchmark or the lender’s cost of funds. From the borrower’s side, it is the premium above a reference rate. Hypothetical example: if the benchmark is 3% and a borrower’s loan is priced at 5%, the spread is 2 percentage points. Variable-rate loans often state the spread explicitly as “benchmark plus X.”

From the lender’s side, the spread is a primary source of profit. A bank that earns an average of 6% on its loans and pays an average of 2.5% on its funding has an interest rate spread of 3.5 points. Common versions include:

• Bank interest rate spread: the average yield on interest-earning assets minus the average rate paid on interest-bearing liabilities. A related but different measure, net interest margin (NIM), divides net interest income by average earning assets. The two diverge because banks fund part of their loans with non-interest-bearing deposits and equity. A narrowing spread points to competition for borrowers, rising deposit costs or both.
• Mortgage spread: the gap between mortgage rates and a benchmark, commonly the 10-year Treasury yield. It reflects credit risk, origination and servicing costs, prepayment risk and market liquidity.
• Corporate loan spread: the margin over a reference rate on business loans. It widens when lenders see more credit risk or economic uncertainty, and narrows when credit is plentiful.

A positive spread usually means an asset’s return exceeds the cost of funding it, as when a bank lends above its deposit rate or a real estate investor’s rental yield exceeds the mortgage rate. A negative spread means the funding costs more than the asset earns, which is unsustainable unless prices rise or the spread changes.

Options Spreads

In options, a spread is not a cost but a strategy: buying and selling two or more options on the same underlying asset at the same time, usually with different strike prices, different expiration dates or both. Spreads are used to cap risk, reduce the cost of a position, or target a specific price range or volatility outcome.

Options spreads are often entered as a single combined order on exchanges. That reduces legging risk, the danger that one leg fills and the other does not, leaving an unintended exposure.

Debit Spreads and Credit Spreads

• A debit spread costs money to open, because the option bought is more expensive than the option sold. The maximum loss is the net debit paid.
• A credit spread pays money to open, because the option sold is more expensive than the option bought. The maximum profit is the net credit received.

Vertical spreads use options of the same type (calls or puts) and the same expiration, but different strikes. The four basic verticals are bull call (debit), bear put (debit), bull put (credit) and bear call (credit).

In the examples below, premiums are per share. Standard U.S. equity option contracts cover 100 shares, so a $2.00 premium equals $200 per contract. All prices are hypothetical, and commissions are ignored.

Bull Call Spread

A bull call spread is built for a moderate rise in the underlying. You buy a call at a lower strike and sell a call at a higher strike, both with the same expiration.

Example: the stock trades at $50.

• Buy the $50 call for $3.00
• Sell the $55 call for $1.00
• Net debit: $2.00 ($200 per contract)

Outcomes at expiration:

• Maximum loss: $2.00, if the stock is at or below $50 and both calls expire worthless.
• Maximum profit: $5.00 strike width − $2.00 debit = $3.00, if the stock is at or above $55.
• Breakeven: $50 + $2.00 = $52.

Compared with buying the $50 call alone for $3.00, the spread costs less and lowers the breakeven. In exchange, it gives up any gain above $55.

Bull Put Spread

A bull put spread is a credit spread for a moderately bullish or neutral view. You sell a put at a higher strike and buy a put at a lower strike, same expiration.

Example: the stock trades at $52.

• Sell the $50 put for $3.00
• Buy the $45 put for $1.00
• Net credit: $2.00 ($200 per contract)

At expiration:

• Maximum profit: $2.00, if the stock closes above $50 and both puts expire worthless.
• Maximum loss: $5.00 width − $2.00 credit = $3.00, if the stock is at or below $45.
• Breakeven: $50 − $2.00 = $48.

The purchased put caps the loss that an uncovered short put would otherwise carry. This is a form of hedging built into the position.

Long Butterfly Spread

A long butterfly targets a stock that stays near a specific price. It uses three strikes, all calls or all puts, with the same expiration: buy one at a lower strike, sell two at a middle strike, buy one at a higher strike.

Example with puts: the stock trades at $50.

• Buy one $45 put for $0.50
• Sell two $50 puts for $2.00 each ($4.00 received)
• Buy one $55 put for $4.50
• Net debit: $0.50 + $4.50 − $4.00 = $1.00 ($100 per contract)

At expiration:

• Maximum profit: if the stock closes exactly at $50, the $55 put is worth $5.00 and the others expire worthless. The profit is $5.00 − $1.00 = $4.00.
• Maximum loss: $1.00, if the stock closes at or below $45 or at or above $55.
• Breakevens: $46 and $54.

Calendar Spread

A calendar spread (or time spread) uses the same strike but different expirations. Typically you sell a near-term option and buy a longer-term one. The position aims to profit from the faster time decay of the short-dated option.

Example: the stock trades at $100.

• Buy a six-month $100 call for $8.00
• Sell a one-month $100 call for $3.00
• Net debit: $5.00 ($500 per contract)

The best case is usually the stock sitting near $100 when the short call expires: it expires worthless while the longer call keeps much of its time value. A rise in implied volatility can also help, because the longer-dated option is more sensitive to it. The risk is a large move before the near-term expiration. A sharp rise can leave the short call deep in the money, with possible assignment, and a sharp fall erodes the long call. Either way the trader can lose up to the net debit.

Risks in Options Spreads

Defined maximum losses do not make spreads risk-free:

• Early assignment: on American-style options, a short leg can be assigned before expiration, particularly when it is deep in the money or ahead of a dividend. That can leave a position that no longer matches the intended structure and may require additional margin.
• Liquidity risk: each leg has its own bid-ask spread, so entering and exiting multi-leg positions in thinly traded options can cost a large share of the potential profit.
• Volatility risk: changes in implied volatility affect long and short legs differently.
• Strategy errors: misjudged breakevens, maximum loss scenarios or margin requirements can turn a “limited-risk” trade into an unexpected loss, especially in fast markets.

Futures Spreads and Spread Trading

A futures spread holds a long position in one futures contract and a short position in a related contract at the same time. The trader profits if the difference between the two prices moves favorably, regardless of whether both prices rise or fall. The two sides are called legs and are usually traded together as one unit. The main types are:

• Intramarket (calendar) spreads: the same commodity in two delivery months, for example long one month of crude oil and short a later month. The difference reflects storage costs, financing and supply expectations.
• Intermarket spreads: related commodities in the same delivery month, such as two grains or two interest rate products.
• Processing spreads: the margin between a raw input and its products. The crack spread compares crude oil with gasoline and heating oil, the crush spread soybeans with soybean meal and oil, and the spark spread power prices with the cost of the fuel used to generate it.

Because the legs partially offset each other, a spread position is often less volatile than an outright position, and exchanges often set reduced margins for recognized spread combinations. The relationship between two contracts can still move sharply, especially near expiration or during supply shocks.

What a Spread Is Not: Common Confusions

Several terms sit close to “spread” and are easy to mix up:

• Spread vs. commission. The spread is built into the quote. A commission is a separate, explicit fee. Total trading cost is the sum of both, so a tight spread with a high commission can cost more than a wider spread with no commission.
• Spread vs. slippage. The spread is the visible gap in the quote before you trade. Slippage is the difference between the price you expected and the price you received, usually because the market moved or depth was insufficient.
• Spread vs. swap or rollover. In forex and CFDs, a swap is the overnight financing charge or credit for holding a position past the daily cutoff. It depends on interest rate differentials and the broker’s terms, not on the bid-ask gap.
• Spread vs. margin. Margin is the collateral required to open and hold a leveraged position. The spread affects your equity once a trade is open, but it is not a deposit.
• Spread vs. spread betting. Spread betting, offered mainly in the UK and Ireland, is a derivative product where you stake an amount per point of price movement. It is a distinct legal and tax category, even though the provider prices it with a bid-ask spread.
• Spread vs. markup. Some currency exchange services and crypto apps quote a single price with a margin built in rather than showing bid and ask. The effect is similar to a spread but harder to see. Comparing the quoted price with the mid-market rate reveals it.

Limitations of Spreads

Spreads are useful, but each type has blind spots.

The quoted bid-ask spread is not the full cost. It applies only to the size available at the best bid and ask. A large order can exhaust that quantity and fill at progressively worse prices. Hidden liquidity can also mean a fill better than the displayed quote. Effective cost is best judged from actual fills relative to the midpoint.

Yield spreads mix several factors. A credit spread includes default risk, liquidity, tax treatment and supply and demand for specific bonds. A wide spread does not by itself say which factor is responsible.

Historical relationships can break. Yield curve inversions, credit spread levels and futures spread patterns have preceded certain outcomes in the past, but none guarantee timing or outcome. Pair and spread trades betting on a return to “normal” can lose heavily if the relationship shifts permanently, and adding to losing spread positions takes on the open-ended risk of the martingale strategy.

FAQs

The Bottom Line

Anyone who trades forex, stocks or options pays the bid-ask spread on every round trip, and short-term traders feel it most when spreads widen. Comparing accounts means converting spread and commission into one cost per round trip at the spreads actually in effect. In bonds and lending, a spread is a risk gauge whose meaning depends on which two values are being compared.