What is slippage: Answer Guide 2027

Slippage is the difference between the price you expected to trade at and the price you actually got — the hidden cost of turning investment ideas into executed trades. In a what is slippage interview question, explain the causes, how it differs from fees, and what traders do about it.

Slippage Interview Questions: What They Test

The causes are microstructure: market orders walk the order book, large orders move prices (market impact), and prices drift between signal and execution (latency). Slippage is distinct from commissions — it is implicit, variable, and often the larger cost for active strategies.

Interviewers want the mitigation toolkit: limit orders instead of market orders, execution algorithms (VWAP, TWAP, POV) that slice orders over time, and pre-trade transaction-cost analysis to size positions against expected slippage. For quant roles, the punchline is that slippage is what separates backtested returns from real returns — strategies die in the gap.

How to Answer a What is Slippage Interview Question

• Define it. "The gap between expected and executed price — the implicit cost of trading."
• Name the causes. "Order-book depth, market impact of your own size, and price drift during execution latency."
• Distinguish from fees. "Commissions are explicit and fixed; slippage is implicit, variable, and often bigger."
• Give the mitigation. "Algos that slice orders, limit prices, and pre-trade cost models — execution is a managed process."

Common Mistakes in Slippage Interview Answers

• Forgetting it in backtests. Paper returns without slippage assumptions are fantasy — always haircut for execution.
• Confusing slippage with spread. The bid-ask spread is one component; market impact and drift are the rest.
• Assuming it is symmetric. Slippage usually works against you — urgency and size push prices the wrong way.

Slippage is where theory meets the market — interviewers use it to test whether you think about implementation, not just ideas.

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FAQ

Q: What causes slippage? A: Limited order-book depth, the market impact of large orders, and price movements between decision and execution.

Q: How is slippage different from commissions? A: Commissions are explicit per-trade fees; slippage is the implicit price concession, which varies with size, urgency, and liquidity.

Q: How do traders reduce slippage? A: With execution algorithms that slice orders over time, limit orders, and pre-trade analysis that matches urgency to expected cost.

Q: Why does slippage matter for backtesting? A: Because strategies that look profitable on paper can lose money after realistic execution costs — slippage is often the difference.

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