Slippage is the difference between the price you expected to pay and the price you actually got when your trade executed. On a good broker, it is tiny or zero. On a bad one, it silently chips away at every trade before you have even started.
This guide explains what slippage is, what causes it, and — most importantly — how you can test a broker's slippage risk using a free demo account before you put real money at risk.
When you click "Buy" at 1.08500 on EUR/USD, your order travels to the broker's server, then to a liquidity pool. By the time it fills, the price might be 1.08505 or 1.08495. That 0.5 pip difference is slippage.
Positive slippage (filling better than expected) is rare. Negative slippage (filling worse) is the default at slower or less liquid brokers, especially during news events.
If you experience 1 pip of negative slippage per trade and trade 100 times per month, that is 100 pips of "invisible cost" on top of spreads and commissions. At standard lot size that is $1,000+ lost before any market move.
You do not need to risk real money to check a broker's slippage. Every regulated broker must offer a free demo account. Here is the 4-step test.
Pick brokers on our comparison table. Open demo accounts with at least two — ideally one ECN model and one market-maker. Most approve instantly with just an email address.
Place 10 market orders on EUR/USD during normal hours (London or NY session). For each order, note the quote price you saw and the actual fill price in your trade confirmation. Calculate the difference in pips.
Check an economic calendar (Investing.com → Economic Calendar → filter "High Impact"). Place orders 30 seconds before a major release. This is where poor execution shows itself most clearly. A good broker will show minimal additional slippage; a poor one may requote or fill 3–5 pips off.
After 10+ orders per broker, average the slippage. Anything consistently above 0.5 pips on EUR/USD during normal hours is a red flag. 0–0.2 pips is good. Negative average (you filled better than expected) indicates a strong ECN routing setup.
| Signal | What it means | Risk level |
|---|---|---|
| Requotes on market orders | Broker rejected your fill and re-offered a worse price | High |
| Fills 2+ pips off quote on majors | Slow execution or thin internal liquidity book | High |
| No execution policy published | Broker does not disclose how orders are routed | High |
| Slippage only on news events | Normal — even top brokers have wider spreads at NFP | Normal |
| 0–0.3 pip slippage on EUR/USD | Standard ECN/STP execution — acceptable | Low |
| Occasional positive slippage | True ECN — fills you at better price when available | Very low |
Beyond your own demo testing, check these sources:
ECN (Electronic Communications Network) brokers route your order directly to a liquidity pool of banks and other traders. They make money on a small per-trade commission. Market-maker brokers take the other side of your trade internally — they make money when you lose. This creates an inherent conflict of interest around execution quality.
Neither model is inherently dishonest, but for slippage testing, ECN brokers nearly always show better results on majors. For beginners trading with smaller sizes, a regulated market-maker with tight fixed spreads can still be suitable — check our broker comparison table for our current analysis.
Our comparison table includes execution model, average spread, and regulation for all listed brokers.
View broker comparison →Slippage is one of the hidden costs of trading that beginners rarely think about until it has already cost them. The good news: testing it costs nothing. Open two or three demo accounts, run 10 market orders each, compare the fill logs. Do this before you fund any live account and you will have real data — not marketing copy — to base your decision on.
Individual trading results vary significantly. Past slippage on a demo account does not guarantee future live-account execution. This guide is for educational purposes only and does not constitute financial advice. Always verify current broker information directly with the broker and their regulator before opening an account.
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