What is spread in finance?

Spread is the difference between the buy price (bid) and sell price (ask) of a financial instrument. It's one of the most important costs incurred when investing, exchanging currencies, or trading in financial markets. The larger the spread, the higher the transaction costs for the investor.

Spread fundamentals – bid and ask prices

Bid price (buy price)

This is the highest price someone is willing to pay for a given financial instrument at that moment. For us as sellers – this is the price at which we can immediately sell.

Ask price (sell price)

This is the lowest price at which someone is willing to sell a given instrument. For us as buyers – this is the price at which we can immediately buy.

Practical example

On XTB platform we see EUR/PLN rate:

• Bid: 4.2450 PLN
• Ask: 4.2470 PLN
• Spread: 0.0020 PLN (2 points)

This means we can sell euros for 4.2450 PLN or buy for 4.2470 PLN. The difference of 0.002 PLN is the cost that goes to the broker/exchange office.

Types of spreads

Currency spread (forex)

Most commonly encountered by individual investors, especially during:

• Currency exchange at exchange offices
• Forex market trading
• Card payments abroad
• International transfers

Stock bid-ask spread

On the stock exchange, each stock has a spread between the best buy and sell offers:

• Liquid assets (e.g., PKO BP): spread 0.01-0.05 PLN
• Mid-cap (e.g., Asseco): spread 0.10-0.50 PLN
• Small-cap: spread can be 1-5 PLN

Bond spreads

Difference between buy and sell prices of corporate or government bonds. Usually expressed in basis points.

Credit spread

Difference between debt instrument yield and risk-free rate (e.g., government bonds).

Factors affecting spread size

Market liquidity

The more participants want to buy and sell a given instrument, the smaller the spread:

• High volume: small spread (e.g., EUR/USD: 1-2 points)
• Low volume: large spread (e.g., exotic currency pairs: 10-50 points)

Volatility

During high market volatility, market makers increase spreads to protect against risk:

• Calm market: normal spread
• High volatility: spread 2-3x larger

Time of day

Spread can change depending on trading session:

• London + American session: smallest EUR/USD spreads
• Night in Europe: increased spreads

Transaction size

Larger transactions can get better spreads:

• Retail (up to 100,000 EUR): standard spread
• Institutional (over 1 million EUR): reduced spread

Currency spread in practice

Online exchange office

Let's check example of exchanging 1,000 EUR at popular exchange office:

• Buy EUR: 4.28 PLN
• Sell EUR: 4.22 PLN
• Spread: 0.06 PLN (6 groszy per euro)
• Exchange cost: 60 PLN for 1,000 EUR transaction

Credit card abroad

Banks apply 3-4% spread from NBP average rate:

• NBP rate: 4.25 PLN
• Bank rate: 4.42 PLN (4.25 × 1.04)
• Cost for 1,000 EUR: 170 PLN spread

Forex broker

Professional platforms offer much smaller spreads:

• EUR/PLN: 2-5 points
• Cost for 1,000 EUR: 2-5 PLN

How to minimize spread costs?

Choose appropriate platform

• Online exchange offices: better rates than physical locations
• Multi-currency brokers: best spreads for active traders
• Fintech apps (Revolut, Wise): competitive rates

Transaction timing

• Avoid weekends: spreads are significantly larger
• Trade during main sessions: smaller spreads
• Avoid economic announcements: increased volatility = larger spread

Transaction size

• Combine transactions: better conditions for larger amounts
• Negotiate with bank: for regular, large transfers

Comparison tools

Regular spread comparison between different providers can bring significant savings.

Spread vs other transaction costs

Commissions

In addition to spread, brokers may charge:

• Transaction commission: 0.1-0.5% of value
• Fixed fee: 5-50 PLN per order

Financing costs

For overnight positions:

• Swap points: cost of carrying position to next day
• Overnight fees: leverage financing charges

Taxes

• Capital gains tax: 19% in Poland
• Financial transaction tax: in some EU countries

Spread in different financial instruments

Index CFDs

• DAX: 1-2 points
• WIG20: 2-5 points
• S&P500: 0.5-1 point

Cryptocurrencies

• BTC/USD: 10-100 USD on major exchanges
• Altcoins: spread can be 1-5% of value

Commodities

• Gold: 20-50 cents per ounce
• Oil: 2-5 cents per barrel

Polish market specifics

Currency exchange landscape

Bank exchange rates:

• PKO BP: typically 3-4% spread on major currencies
• mBank: competitive rates for premium clients
• Millennium: special rates for business accounts

Online exchange offices:

• Cinkciarz.pl: competitive spreads, large volumes
• Walutomat: peer-to-peer currency exchange
• Conotoxia: fintech solution with tight spreads

Stock market spreads (WSE)

Large-cap stocks (WIG20):

• PKO BP: 0.01-0.03 PLN spread
• CD Projekt: 0.05-0.20 PLN spread
• Allegro: 0.10-0.50 PLN spread

Mid-cap stocks (mWIG40):

• Spreads typically 0.1-1 PLN
• Higher during low volume periods
• More volatile during earnings announcements

Advanced spread analysis

Relative spread calculation

Relative Spread = (Ask - Bid) / Mid-price × 100%

This normalizes spread across different price levels, making comparisons meaningful.

Time-weighted spread analysis

Professional traders track spread patterns:

• Morning: typically wider spreads at market open
• Midday: tightest spreads during peak activity
• Evening: widening spreads as liquidity decreases

Volume-weighted considerations

Large trades may experience:

• Market impact: moving the price unfavorably
• Partial fills: at different price levels
• Hidden spreads: beyond visible bid-ask

Technology and spread reduction

Electronic trading evolution

Modern platforms have reduced spreads through:

• Algorithmic market making: more efficient pricing
• Increased competition: multiple liquidity providers
• Direct market access: eliminating intermediaries
• Price aggregation: best bid/ask from multiple sources

Retail investor benefits

Technology improvements benefit individual investors:

• Fractional pips: spreads as low as 0.1 pip on major pairs
• Negative spreads: occasional rebates during high liquidity
• Transparent pricing: real-time spread visibility
• Mobile optimization: efficient trading on smartphones

Cost optimization strategies

Smart order types

Limit orders: avoid paying the spread by setting desired price Market orders: immediate execution but full spread cost Stop-limit orders: protection with controlled spread impact

Portfolio-level management

Consider spreads when:

• Rebalancing frequency: more frequent = higher spread costs
• Position sizing: larger positions justify spread research
• Asset allocation: include spread costs in expected returns
• Tax optimization: spread costs can affect after-tax performance

Monitoring and analysis tools

Effective spread management requires systematic tracking:

• Real-time spread alerts when favorable conditions occur
• Historical spread analysis to identify optimal trading times
• Cross-platform comparison to find best execution venues
• Impact measurement of spreads on portfolio performance

Professional investment management platforms can automate spread monitoring and alert investors to opportunities for cost reduction across different asset classes and trading venues.

Psychological aspects of spread costs

Hidden cost perception

Spreads are often less visible than commissions, leading to:

• Underestimation of true trading costs
• Overtrading when spreads seem "free"
• Poor timing decisions without spread consideration

Strategic patience

Understanding spreads encourages:

• Longer holding periods to amortize spread costs
• Batch transactions instead of frequent small trades
• Quality over quantity in investment decisions

Regulatory considerations

MiFID II requirements

EU regulations require:

• Best execution policies from brokers
• Transparent reporting of execution quality
• Cost disclosure including spread impacts
• Client categorization affecting available spreads

Polish regulatory environment

KNF oversight ensures:

• Fair pricing practices in domestic markets
• Adequate liquidity provision requirements
• Consumer protection in retail forex markets
• Standardized reporting of execution costs

Summary

Spread is a hidden cost in every financial transaction. Understanding its mechanics and factors influencing its size allows for:

• Better broker/exchange office selection
• Optimal transaction timing
• More accurate investment cost calculations
• Increased efficiency of investment strategies

Remember: The more active you are as an investor, the greater the importance of minimizing spread costs for your long-term profitability. Every saved basis point compounds over time, making spread optimization a crucial element of successful investment management.