What is forex slippage?
When you click "Buy EUR/USD at 1.0850", you expect to be filled at 1.0850. But by the time your order reaches the broker's server, is matched against available liquidity, and is executed, the price may have moved. If you are filled at 1.0853, you have experienced 3 pips of negative slippage. If you are filled at 1.0848, you have experienced 2 pips of positive slippage.
Slippage is not a broker scam — it is a structural feature of any market where prices move in real time. The question is not whether a broker causes zero slippage (none do), but whether the slippage you receive is proportionate to market conditions and consistent with what the broker advertises.
For retail traders, slippage is often invisible until it becomes significant. A scalper placing 30 trades a day at 2–4 pips of slippage each direction is paying an extra 60–240 pips per day in hidden execution cost. That is money that never shows up on a spread comparison tool — yet it can transform a profitable strategy into a losing one.
How to think about it: Your real trading cost is spread + commission + slippage. Most broker comparison tools show only the first two. Slippage is the one cost you have to test yourself.
Types of slippage
Negative slippage
Filled at a worse price than requested. Adds to your cost on entry and reduces your proceeds on exit.
Positive slippage
Filled at a better price than requested. Less common, but ECN brokers do pass it through — a sign of genuine best-execution practice.
Zero slippage
Filled exactly at the requested price. Rare in truly live markets, but achievable with limit orders and high-liquidity sessions.
A key indicator of a trustworthy broker is that slippage runs in both directions. A broker that only ever slips you negatively — never positively — is almost certainly using a dealing-desk model that systematically prices against you. Reputable ECN brokers like IC Markets and Pepperstone publish slippage statistics showing symmetrical positive and negative fills.
When does slippage occur?
Slippage is not random. It concentrates in predictable conditions. Understanding these lets you avoid it or at least plan for it.
High-impact news events
The five minutes before and after events like Non-Farm Payrolls, FOMC rate decisions, CPI prints, and ECB press conferences are the highest-slippage environments in retail forex. Spreads widen dramatically and market orders can slip 5–30 pips depending on the broker's liquidity arrangements. If your strategy does not require trading the news spike, close positions before the event and re-enter afterwards.
Low-liquidity sessions
The Asian session gap — roughly 17:00–19:00 UTC — is a low-liquidity window between the New York close and the early Asian session. EUR/USD and GBP/USD can be significantly thinner during this period. The weekend open on Sunday is similarly prone to gaps and slippage. The London session (07:00–12:00 UTC) and the London–New York overlap (12:00–16:00 UTC) are typically the most liquid and lowest-slippage windows for major pairs.
Market orders on fast-moving prices
Market orders guarantee execution, not price. During a fast market, the quote you see on screen can be several pips stale by the time your order is processed. Limit orders, by contrast, guarantee price but not execution — they only fill if the market comes to you.
Large position sizes
A 10-lot order in a thin market can exhaust the available liquidity at the best price and be filled across multiple price levels. This is called market impact. For most retail traders using standard or mini lots, this is not an issue on major pairs — but it matters when trading exotics or during news events.
Broker infrastructure
Latency between your order and the broker's execution engine adds slippage. Brokers co-located on the same exchange servers as their liquidity providers (NY4 or LD4 data centres) have sub-millisecond execution. Brokers routing orders through multiple intermediaries add latency and therefore slippage.
How to test a broker's slippage
The only way to measure real slippage is to place real trades. Here is a practical methodology that gives you a statistically meaningful picture without risking significant capital.
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Open a live account with a small deposit
A demo account will never reproduce live execution conditions — brokers typically use idealised fills in demo mode. Open a real account with the broker's minimum deposit (usually €50–€200 for EU-regulated brokers). Do not use a cent account or a bonus account — use a standard trading account in the same account type you intend to trade with.
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Choose a benchmark pair and session
Run your test on EUR/USD during the London or London–New York overlap session, when liquidity is highest and conditions are most predictable. This gives you a baseline. Later you can repeat the test during news events to measure the worst-case execution.
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Place 20–50 market orders at micro lot size
Use a 0.01 lot size (micro lot) — this minimises real P&L risk while giving you real fills. Place buy and sell orders at random intervals over 3–5 trading sessions, avoiding the first and last 10 minutes of each session where the book is thinner. Record each requested price and the actual fill price in a spreadsheet.
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Calculate average slippage and direction
For each trade, compute:
fill price − requested price(in pips). Positive values are positive slippage (better than expected); negative values are negative slippage (worse than expected). Average all values. A well-run ECN broker should be within ±0.3 pips average, with a mix of positive and negative fills. If the average is consistently −1 pip or worse, or if all fills are negative, consider that a red flag. -
Test during a scheduled news event
Deliberately place a market order 30 seconds before a medium-impact event (e.g. a PMI release). Note the slippage. This tells you the broker's worst-case execution — important if your strategy involves holding through news, or if you need to exit a position in a fast market.
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Compare against the broker's published slippage data
IC Markets and Pepperstone publish monthly execution quality reports. Cross-reference your results. A significant divergence between published data and your experience is worth raising with the broker's support team or reporting to CySEC (if Cyprus-regulated) or the FCA (if UK-regulated).
How to minimise slippage in your trading
You cannot eliminate slippage entirely — but you can reduce it substantially with the right approach.
Use limit orders
Limit orders fill at your price or better, or not at all. This is the single most effective way to guarantee your entry price — at the cost of missed fills when the market moves through your level.
Trade the liquid sessions
The London open (07:00–09:00 UTC) and the London–New York overlap (12:00–16:00 UTC) offer the deepest liquidity for EUR/USD and GBP/USD. Avoid trading the Sunday open and the NY–Asia gap.
Avoid market orders around news
If you must hold through a high-impact news event, use a limit order for entry or exit — or close the position before the release and re-enter after the initial spike settles.
Set a slippage tolerance
Most platforms let you set maximum slippage on market orders. Setting a 2-pip tolerance means your order will reject if the fill would be worse than 2 pips from your requested price — preventing extreme fills during fast markets.
Choose an ECN/STP broker
ECN brokers route your order directly to interbank liquidity without a dealing desk. They have no incentive to widen your spread or price against you. They also pass through positive slippage — a sign of genuine best-execution.
Use a VPS near the broker server
If you run automated strategies, co-locate your EA on a VPS in the same data centre as your broker's execution engine (NY4 or LD4). Even 1–2ms of reduced latency can meaningfully reduce slippage on fast-moving markets.
Which EU-regulated brokers have the lowest slippage?
The table below ranks six CySEC and FCA-regulated brokers on execution quality, based on our independent testing methodology and publicly available execution quality reports. All brokers operate under ESMA leverage limits: 30:1 for major forex pairs, 20:1 for minor pairs and gold, 10:1 for commodities, 5:1 for equities.
| Broker | Model | Avg slippage (EUR/USD) | Positive slippage? | Platform | Review |
|---|---|---|---|---|---|
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IC Markets
Best overall execution · CySEC licensed
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ECN | ±0.1 pip | Yes ✓ | MT4, MT5, cTrader | View broker |
|
Pepperstone
Excellent for scalping · FCA + CySEC
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ECN/STP | ±0.15 pip | Yes ✓ | MT4, MT5, cTrader | View broker |
|
Eightcap
Consistent execution · ASIC + CySEC
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ECN/STP | ±0.2 pip | Yes ✓ | MT4, MT5 | View broker |
|
Exness
Instant execution model · CySEC
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Hybrid | ±0.2 pip | Partial ✓ | MT4, MT5 | View broker |
|
XM
Acceptable for beginners · CySEC
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Market maker | ±0.4 pip | Limited | MT4, MT5 | View broker |
|
XTB
Good for beginners · FCA + KNF
|
Market maker | ±0.4 pip | Limited | xStation 5 | View broker |
Slippage figures are indicative averages for EUR/USD during the London session, based on 50+ market-order tests per broker. Individual results will vary. Figures do not constitute a guarantee of future execution.
Why IC Markets and Pepperstone perform best: Both are co-located at the NY4 and LD4 data centres and connect to Tier-1 liquidity providers including banks, non-bank market makers, and ECNs. This deep liquidity pool means your order almost always fills at the best available price — and when the market moves in your favour during execution, the positive slippage is passed through.
Market-maker brokers like XM and XTB have an inherent conflict of interest: they take the other side of your trade internally. This does not mean they engage in price manipulation — both are regulated — but it does mean their slippage incentives differ from a pure-pass-through ECN model.
Slippage and EU regulatory requirements
All brokers regulated by CySEC, FCA, or other EU/EEA regulators are required to provide best execution under MiFID II. This means they must take all sufficient steps to obtain the best possible result for client orders, considering factors including price, speed, likelihood of execution, and transaction cost.
In practice, MiFID II best execution requires brokers to:
- Maintain and publish an order execution policy
- Monitor execution quality against their stated policy
- Publish annual execution quality reports (RTS 27 / RTS 28)
- Notify clients when a material change to the execution policy occurs
If you believe a broker is systematically providing poor execution without legitimate market-condition justification, you can raise a complaint with the regulator. For CySEC-regulated brokers, submit a complaint at cysec.gov.cy. For FCA-regulated brokers, contact the Financial Ombudsman Service if the broker's internal complaint process fails.
Frequently asked questions
Is slippage illegal?
No. Slippage is a natural result of real market conditions — prices move between when you place an order and when it is executed. What is regulated is whether a broker makes reasonable efforts to obtain the best available price (best execution). Systematic one-sided slippage that consistently benefits the broker is a regulatory matter, not normal market slippage.
Can I get positive slippage?
Yes — with ECN/STP brokers that have genuine pass-through execution. If the market moves in your favour between order placement and execution, you receive a better fill than requested. IC Markets and Pepperstone both publish data showing a meaningful proportion of positive slippage fills. Market-maker brokers are less likely to pass through positive slippage.
Does a lower spread mean lower slippage?
Not necessarily. Spread and slippage measure different things. A broker can advertise a 0.0-pip spread on EUR/USD (raw ECN) while having variable slippage depending on liquidity depth. Conversely, a broker with a 1.0-pip fixed spread might consistently fill at the displayed price with zero slippage. You need to test both components separately.
What is "requote" and how does it differ from slippage?
A requote happens when a broker cannot fill your order at the requested price and instead offers you a new price for your approval — rather than filling you automatically at the moved price. Requotes are associated with dealing-desk brokers and market makers. ECN brokers typically do not requote: they fill you at the best available price (which might be worse than requested — that is slippage) or not at all. Most traders prefer slippage over requotes because slippage does not require manual intervention and can be positive.
Does slippage affect stop losses?
Yes. Stop-loss orders are market orders once triggered, which means they are subject to slippage. In a fast-moving market, your stop might be triggered at 1.0850 but executed at 1.0844 — 6 pips beyond your intended risk. This is called stop-loss slippage and is especially significant in high-volatility events. Some brokers offer "guaranteed stop losses" for an additional premium — these are only worth the cost if you frequently trade news events or hold positions overnight.
How much does slippage cost on average?
For a standard EU retail trader placing market orders on EUR/USD during liquid sessions with a reputable ECN broker, average slippage is typically 0.1–0.3 pips per side. At a 0.2 pip average with 20 round-trip trades per month on 1-lot size, that is approximately $40/month in hidden execution cost — comparable to two additional spread payments per trade. For scalpers placing 10+ trades per day, slippage becomes a primary cost driver and broker choice is critical.
Final thoughts
Slippage is one of the most underestimated trading costs among retail forex traders. The good news is that it is measurable, and the methodology for testing it is accessible to anyone — even with a small live account and a spreadsheet.
The practical hierarchy: use limit orders wherever your strategy allows; trade during the London and London–New York overlap sessions; choose a true ECN broker; and run your own slippage test before committing serious capital to any broker.
EU-regulated ECN brokers like IC Markets and Pepperstone offer the most transparent execution environments available to retail traders in Europe. Our full broker reviews include execution quality scores alongside spread and commission data.
Slippage is only half the execution picture — speed matters too. See our free guide to measuring a broker's real-time execution latency with ping tests and platform journal logs.