FX Spread and Slippage: The Costs Hidden in a Chart Screenshot
Broker bid-ask spreads and order execution can change a trade's outcome even when the displayed market direction is correct.
A foreign-exchange platform may prominently show a midpoint or last traded price while orders execute against bid and ask quotes. The difference is a spread cost. During thin liquidity or major announcements, available quotes can change quickly, and stop or market orders may be filled at a different price from the one a trader saw.
Slippage is not always proof of unfair execution; it may reflect genuinely changing market depth, but brokers should be assessed against their published execution policies. A very tight advertised minimum spread may not represent the cost experienced through an entire volatile session.
Use effective spread, commission, swap charges and execution records when comparing platforms. Test execution quality during ordinary and event-driven conditions, and understand the difference between a stop instruction and a guaranteed stop where such a product exists. Small stop-loss distances can make transaction costs especially consequential.
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