Why Most Traders Never Ask About Slippage — And Should

Spread, commission, leverage — these get asked about constantly, because they're on every pricing page. Slippage almost never comes up in the same conversations, mostly because it doesn't appear anywhere on a marketing page for a prospective client to notice and ask about.

What slippage actually is

Slippage is simply the difference between the price you intended to trade at and the price you actually got filled at. Some slippage is normal and unavoidable — markets move between the moment you click and the moment the order reaches the market, especially during fast-moving conditions or around major news releases. It can run in your favor (positive slippage) just as easily as against you (negative slippage) — the direction is what actually matters, not the fact that it happens at all.

Why almost nobody asks about it

It's not on any pricing comparison page, it requires actual trade history to notice, and most traders don't know it's a distinct, checkable thing separate from the spread until they've been trading for a while. Brokers aren't hiding it exactly — it's just genuinely easy for it to never come up, since nobody's asking and it's not required marketing disclosure the way spreads and leverage caps often are.

That's slowly changing. Several regulators now require brokers to disclose execution-quality data directly: the UK's FCA requires regular execution-quality reporting, Cyprus's CySEC requires the slippage and spread mechanism itself to be disclosed, and Australia's ASIC has specifically prohibited brokers from advertising "zero slippage" as a feature — because, structurally, no execution model can honestly promise that. If a broker's marketing claims otherwise, that claim itself is the red flag, not the slippage.

The direct questions worth asking, before opening an account

• What's your execution model — do orders route to external liquidity providers, or fill against your own book?
• Do you offer negative slippage protection, or any policy on requotes?
• Can I see historical execution statistics, not just advertised spreads?
• What happens to my order during high-volatility news events specifically?
• Is your execution model a genuine ECN, or a market-making desk that fills orders internally?

What's normal vs. what's actually a red flag

Random slippage, roughly balanced between working in your favor and against it over time, especially around news events, is expected and not a sign of anything wrong. Slippage that's consistently negative — always against you, rarely if ever in your favor, across a meaningful number of trades — is the pattern worth taking seriously and raising directly with the broker, or reconsidering the relationship if it doesn't improve.

One specific trick worth knowing: a broker that markets "zero slippage" or "guaranteed fills" is very often compensating for that guarantee somewhere else — a wider spread baked in permanently, or a last-look system that quietly rejects the fills that would have worked in your favor while still honoring the ones that don't. Symmetric execution — positive and negative slippage both passed through honestly — is the actual marker of a broker playing it straight, not the absence of slippage entirely.

How to actually check your own pattern

This doesn't require anything exotic — just your own trade history, compared entry by entry against the price you intended versus the price you were actually filled at. Over a large enough sample (a few dozen trades minimum, ideally more), the direction should look roughly random if execution is fair. A visible, consistent skew in one direction across that sample is the actual signal, not any single trade in isolation.