Contents
- •Why This Guide
- 1What Slippage Is
- 2Why Slippage Happens Naturally
- 3Slippage by Order Type
- 4Where Slippage Can Be Manufactured
- 5Documented Cases
- 6The Detection Principle: You Can't See the Bridge, but You Can See Its Results
- 7Collecting the Data from MetaTrader
- 8Reading the Results in Numbers
- 9Warning Signs — and What Isn't Evidence
- 10Protecting Yourself, and What to Do If You Find a Pattern
- •Disclosure and Sources
Introduction
Why This Guide#
Slippage is one of the things traders complain about most and understand least. Some see manipulation in every slip; others never notice it at all while it eats into every trade.
The truth lies between the two. Slippage is a natural part of any real market and happens even with the most honest brokers. But it is also the easiest form of manipulation to hide, because every individual slip can be explained away. The difference between natural and manufactured slippage never shows in a single trade — it shows in the pattern across dozens of trades.
This guide gives you a way to see that pattern for yourself, with numbers that don't require you to trust anyone — not the broker, and not us.
Natural slippage goes both ways. Manufactured slippage goes one way: against you.
Chapter 1
What Slippage Is#
Slippage is the difference between the price at which you asked to be filled and the price at which your order was actually filled.
| Type | What it means | Gold example |
|---|---|---|
| Negative slippage | Your order was filled at a worse price than requested. | You asked to buy at 4000.20 and were filled at 4000.45. |
| Positive slippage | Your order was filled at a better price than requested. | You asked to buy at 4000.20 and were filled at 4000.05. |
| No slippage | Filled at exactly the requested price. | You asked for 4000.20 and were filled at 4000.20. |
How it is measured#
In this guide we use a sign convention that makes reading easy: positive = in your favour, negative = against you, whatever the direction of the trade.
| Trade | Slippage (in your favour +, against you −) |
|---|---|
| Buy | Requested price − Filled price |
| Sell | Filled price − Requested price |
Its dollar value on gold = price slippage × 100 × trade size. So a $0.25 slip on a full contract = $25, and on 0.10 lot = $2.50. It looks small on one trade, but over a hundred trades it can be the difference between a winning system and a losing one.
Chapter 2
Why Slippage Happens Naturally#
Before you accuse your broker, know the legitimate causes. They occur with every broker; good brokers reduce them but cannot eliminate them.
| Cause | How it works |
|---|---|
| Latency | From your platform to the broker's server, then to the bridge, then to the liquidity provider and back. Tens or hundreds of milliseconds — and gold can move in that time. |
| Liquidity depth | The best quoted price is available only for a limited size. If your order exceeds that size, the remainder is filled at the next price. |
| Volatility and news | When major news is released, prices move fast, spreads widen and liquidity is withdrawn for a few seconds. |
| Price gaps | Between the Friday close and the Monday open, or after a surprise announcement, price jumps without passing through the levels in between. A stop sitting inside the gap is filled at the first available price after it. |
| Liquidity provider rejection | If the provider rejects the price ("last look"), the order is resent at a new price. |
The result you should expect from all of these causes: slippage that is small in quiet periods, larger around news and gaps, and in both directions — because during the latency window price can move in your favour just as easily as against you.
Chapter 3
Slippage by Order Type#
Not all orders are equal when it comes to slippage. Understanding the difference is the key to detection, because some orders should never slip against you at all.
| Order | How it is filled | Expected slippage in an honest market |
|---|---|---|
| Market order | At the best available price on arrival. | Both directions, averaging close to zero in quiet periods. |
| Limit order buy below / sell above | At the set price or better. | Should never be negative. May be positive in gaps. |
| Take profit (TP) | A limit order: at its price or better. | Should never be negative. If price gaps through it, you should receive the better price. |
| Stop order buy above / sell below | Becomes a market order once its price is touched. | Naturally leans negative, because it fills while price is moving strongly in the same direction. |
| Stop loss (SL) | A stop order: becomes a market order. | Small in quiet conditions, larger around news, and the full gap in gaps. |
| Stop out | The broker closes positions at the margin level. | At the market price at the moment of closing. |
Take-profit and limit orders fill at their price or better. If your history shows a take profit filled at a worse price than its level, that is not "a fast market" — it violates the nature of the order itself. And if your take profit never receives a better price even when price gaps through it, while your stop loss always takes the full gap against you, that is asymmetric slippage.
An important note on stop losses#
Because a stop loss fills while price is surging against you, its slippage is usually negative even with an honest broker, especially around news. So don't judge your broker by the fact that your stops slip against you. Judge it by the size of that slippage in quiet periods, compared with another broker.
Chapter 4
Where Slippage Can Be Manufactured#
Between the Buy button and the fill sit layers of software — the platform, the bridge and execution tools — and each has settings. Those settings have legitimate uses, but they can also be tuned against the client.
Settings that affect slippage#
| Setting | Legitimate use | Abusive use |
|---|---|---|
| Execution delay | Protection against stale prices and latency arbitrage. | A fixed delay applied to a group of clients so that price moves against them in the meantime. |
| Slippage policy | Passing real slippage to the client in both directions. | Passing on negative slippage in full while withholding or trimming positive slippage. |
| Deviation limit and order rejection | Rejecting an order if price moves beyond a set limit. | Rejecting orders only when price moves in the client's favour, and filling them when it moves against. |
| Execution markup | — | In the A-Book: filling your trade with the provider at one price, booking it to you at a worse one, and keeping the difference. |
| Price source in the B-Book | Internal pricing built from providers' feeds. | Pricing that produces abnormal spikes at the levels where clients' stops sit. |
| Spread widening | Reflecting genuine market widening during news. | Momentarily widening the spread just enough to trigger nearby stops. |
Note that these settings can be applied to one group of clients and not others. Your execution may be poor while another trader at the same broker sees excellent execution — which is why other people's experiences aren't enough, and why you must measure your own account.
Why you can't see the bridge#
Bridge and platform-server settings are internal to the broker; clients have no access to them. There is no button in MetaTrader that tells you "this account has an 800-millisecond delay". But each of these settings leaves a statistical fingerprint in your trade history — and that is what we measure in the chapters that follow.
Chapter 5
Documented Cases#
Asymmetric slippage is not a conspiracy theory. These are cases proven by official regulators, who imposed fines and restitution.
The US Commodity Futures Trading Commission (CFTC) found that a US broker had configured its platform with asymmetric slippage parameters: if price moved more than two pips in the client's favour between order placement and execution, the order was rejected; if it moved more than two pips in the broker's favour, it was filled at the original price. The broker was ordered to pay more than $1.8 million in restitution to its clients, in addition to penalties from the Commission and from the National Futures Association (NFA). More than 24,900 accounts were affected.
The UK Financial Conduct Authority (FCA) fined the UK arm of a large broker £4 million because its group kept the profits from price movements in clients' favour between order placement and execution — worth £6 million between 2006 and 2010 — while passing losses on in full. The firm agreed to return up to $9.9 million to clients.
What these two cases teach us#
- The manipulation was not in a particular trade but in a rule configured in the system and applied to every trade.
- Each trade on its own looked normal. The pattern only appeared when thousands of trades were analysed.
- Both cases were uncovered by regulators with the power to inspect systems. With a broker that has no real supervisor, you are the only supervisor.
The other side: transparency is possible#
Some brokers publish periodic execution statistics: the share of orders that received positive, negative and no slippage, for each order type. Publishing these figures is no guarantee, but it is a good sign — ask your broker whether it publishes them.
Chapter 6
The Detection Principle: You Can't See the Bridge, but You Can See Its Results#
You don't need to know the broker's settings. You need an accurate record and one question: does my slippage behave the way slippage behaves in an honest market?
Five questions your history answers#
| # | Question | What to expect in an honest market |
|---|---|---|
| 1 | Is market-order slippage symmetric? | Positive and negative in similar proportions, with an average close to zero in quiet periods. |
| 2 | Was any take profit or limit order filled worse than its price? | Never. |
| 3 | Does a take profit receive the better price when price gaps through it? | Yes, at least sometimes. |
| 4 | How large is stop slippage in quiet periods? | Small, and similar to another broker at the same moment. |
| 5 | Did execution change after a profitable period? | No. |
What is easy to measure, and what takes effort#
- Easy to measure: stop losses, take profits and pending orders — because the requested price is recorded in the order itself and the fill price is recorded in the deal. Slippage = the difference between them, straight from the history.
- Takes effort: market orders in "market execution" mode, because they are sent without a requested price, so the history doesn't keep the price you saw when you clicked. You need to record it yourself, or use a tool that records it automatically (Chapter 7).
Chapter 7
Collecting the Data from MetaTrader#
You don't need special software. MetaTrader keeps what you need; you just need to know where to look.
MetaTrader 5#
- Open the History tab at the bottom of the platform and choose to view Orders and Deals together.
- For every order closed by a stop, a target or a pending order, you'll find the order price (the requested price) and the deal price (the filled price).
- Right-click, choose Report and export it, or copy the data into a spreadsheet.
- Calculate the slippage of each trade using the sign convention above: positive in your favour, negative against you.
MetaTrader 4#
- In the Account History tab, right-click and choose Save as Detailed Report.
- For trades closed by a stop or a target, compare the close price with the S/L or T/P value on the same line.
Market orders: record them yourself#
Before you click Buy or Sell, record the displayed price and the time — a screenshot is enough. After the fill, take the deal price from the history. A small helper program (an Expert Advisor) running on the platform can also do this for you, saving for each order the price at the moment of sending, the fill price and the execution time.
The table you need#
| Time | Type | Side | Requested | Filled | Slippage | Quiet/News | Exec. time |
|---|---|---|---|---|---|---|---|
| 10:14:02 | Market | Buy | 4000.20 | 4000.25 | −0.05 | Quiet | 0.2s |
| 15:31:08 | Stop | Sell | 3995.00 | 3994.10 | −0.90 | News | — |
| 16:05:44 | Target | Sell | 4012.00 | 4012.00 | 0.00 | Quiet | — |
The "Quiet/News" column: classify a trade as "News" if it falls within the half hour around a high-impact release.
Chapter 8
Reading the Results in Numbers#
After 30 trades or more, you have enough to form a judgement. Here are four tests, from the simplest to the most precise.
Test 1: Limit orders and take profits#
Count how many take-profit or limit orders were filled with negative slippage. The correct answer is zero. Even a single case deserves a written question to the broker.
Test 2: Symmetry of market orders in quiet periods#
Take only the market orders placed in quiet periods, and exclude those with zero slippage. In an honest market, roughly half of the rest should be positive and half negative. The question is: at what point does the share of negatives become too high to be explained by chance?
| Non-zero slips | Negatives that raise suspicion | Share | Probability it is chance |
|---|---|---|---|
| 10 | 9 or more | 90% | ≈ 1.1% |
| 15 | 12 or more | 80% | ≈ 1.8% |
| 20 | 15 or more | 75% | ≈ 2.1% |
| 30 | 20 or more | 67% | ≈ 4.9% |
| 50 | 32 or more | 64% | ≈ 3.3% |
Calculated on the assumption that positive and negative are equally likely in an honest market (a sign test). The more trades you have, the more precise the test.
Example: of 20 non-zero slips in quiet periods, 17 were negative. The probability of this happening by chance in an honest market is under 1%. That is not "bad luck".
Test 3: Average slippage and its cost#
Calculate the average slippage of your market orders (with its sign). In an honest market it is close to zero in quiet periods. Then calculate its total cost in dollars: the sum of (slippage × 100 × size). Compare it with the spread: if slippage adds around half the spread or more to every trade in quiet periods, it is a significant hidden cost.
Test 4: Direct comparison#
The most precise test: open a small account with a second broker and place the same orders at the same moment in a small size (manually, or with a trade copier). Then compare each pair of trades: slippage, execution time and stop slippage. Small differences are normal. A systematic difference — one that repeats in a single direction — is not.
An extra test: before and after profits#
Split your history into two periods: before and after a clear winning streak. If execution clearly deteriorates afterwards — more slippage, longer execution times or more requotes — your account may have been moved to a "group" with different settings.
Chapter 9
Warning Signs — and What Isn't Evidence#
Signs worth stopping for#
- A take profit or limit order filled worse than its price.
- Take profits never receive the better price in gaps, while stops take the full gap against you.
- The share of negatives in quiet market orders exceeds the thresholds in the Chapter 8 table.
- Long, constant execution times (around a second or more) in quiet periods, as if every order is waiting.
- Requotes that appear when price moves in your favour but not when it moves against you.
- Execution that deteriorates after a profitable period.
- Sharp spikes on the broker's chart at your stop levels that don't appear in other sources.
What is not evidence on its own#
- Large slippage on a stop loss during major news — that is normal.
- A stop filled far from its price after the weekly opening gap — that is normal.
- One or two trades with negative slippage — a sample too small to judge.
- Another trader having "heard" that the broker manipulates — measure your own account.
- A small difference between your broker's chart and another source — every broker aggregates prices from different providers.
Judge the pattern across dozens of trades, separated into quiet periods and news periods, and compared with another broker. That is how you protect yourself from manipulation — and also from unfairly accusing an honest broker.
Chapter 10
Protecting Yourself, and What to Do If You Find a Pattern#
Reduce your exposure to slippage#
- Enter with limit orders when your style allows; they do not slip against you.
- Avoid market orders around news — the 30-minutes-before-and-after rule protects you from the largest slips.
- Set a maximum deviation in instant-execution mode if available, so the order is rejected rather than filled far away.
- Keep your stops slightly away from obvious round numbers, where orders cluster and liquidity is withdrawn.
- Ask about guaranteed stops if the broker offers them for a fee; check the product terms, exclusions and fees before relying on them.
- Close before the weekend if the Monday gap worries you.
If you find a pattern against you#
- Gather the evidence: the table, the report exported from the platform, screenshots and your test results.
- Ask in writing: request the broker's order execution policy, the execution statistics for your account, and an explanation of specific trades, with their numbers.
- File a formal complaint with the complaints department, built on facts and numbers rather than impressions.
- Escalate to the regulator that licenses the entity you contract with, if there is one.
- Withdraw your balance before opening new trades.
Quick checklist#
| Question | |
|---|---|
| ☐ | I have a record of at least 30 trades, separated into quiet and news. |
| ☐ | No take profit or limit order was filled worse than its price. |
| ☐ | Slippage on quiet market orders is symmetric (within the Chapter 8 table). |
| ☐ | Average slippage in quiet periods is close to zero. |
| ☐ | Execution time is short and not stuck at one high value. |
| ☐ | Execution did not change after a profitable period. |
| ☐ | I compared with a second broker and found no systematic difference. |
Closing
Disclosure and Sources#
Consultya acts as an introducing broker (IB) for a licensed partner broker and may receive disclosed commissions from that partner. This guide does not accuse any particular broker. The documented cases come from official regulators and are included to illustrate practices. Numerical examples are illustrative.
The statistical tests in this guide are tools for initial screening, not legal proof. This guide is educational and is not investment or legal advice. Trading contracts for difference carries a high risk of losing capital.
Sources#
- US Commodity Futures Trading Commission (CFTC) — order against FXDD regarding asymmetric slippage parameters, September 2013.
cftc.gov — enffxddorder091813.pdf - National Futures Association (NFA) — action against FXDD regarding asymmetric slippage.
financemagnates.com — nfa-hits-fxdd-with-multiple-charges-including-asymmetric-slippage - UK Financial Conduct Authority (FCA) — fine on FXCM UK for keeping positive slippage, February 2014.
fca.org.uk — financial-conduct-authority-fines-fxcm-uk-£4-million - FCA — thematic review of best execution, TR14/13.
fca.org.uk/publication/thematic-reviews/tr14-13.pdf - Limit orders fill at their price or better, and published slippage statistics.
fxcm.com/markets/execution/slippage-statistics · ig.com/uk/risk-management/what-is-slippage - Measuring slippage from MetaTrader 5 history: market orders are sent without a requested price.
mql5.com/en/forum/437629 · mql5.com/en/articles/211 - Broker execution and slippage settings.
leverate.com — slippage-in-trading · b2broker.com — slippage-in-trading
© 2026 Consultya · info@consultya.co · This guide is educational and is not investment advice.