Spread in forex: types, hidden costs, and why it decides if a strategy works
The spread is the cost paid on every entry. Fixed, variable and raw compared properly with commission, what the advertised average hides, and why the same rules win at one broker and lose at another.
The spread is the difference between the price you can sell at (the bid) and the price you can buy at (the ask). If EUR/USD shows 1.08500 bid and 1.08512 ask, the spread is 1.2 pips. You pay it the moment you open a trade: buy at the ask, and the position is immediately valued at the bid, so it starts 1.2 pips down.
It is the most frequent cost in trading and the one most often left out of a plan.
Fixed, variable and raw
| Type | How it behaves | Commission | Suits |
|---|---|---|---|
| Fixed | Stays the same in normal conditions, widens or freezes in extreme ones | Usually none | Predictability over cost |
| Variable (standard) | Moves with liquidity, wider at thin hours and around news | Usually none | General use |
| Raw or ECN | Close to the interbank spread, often near zero on majors | Yes, typically per lot per side | Frequent trading, short targets |
A raw account is not automatically cheaper. The comparison is spread plus commission against spread alone. If a standard account quotes 1.4 pips and a raw account quotes 0.2 pips with $7 per lot round turn, then on EUR/USD, where $7 is about 0.7 pips on a standard lot, the raw account costs about 0.9 pips against 1.4. Cheaper here, but the ranking flips on pairs with naturally wider spreads or on smaller position sizes.
What the advertised number leaves out
Brokers advertise a typical or average spread. Two things make the real cost higher:
- Averages hide the tails. An average of 0.9 pips can be made of long calm periods at 0.6 and short bursts at 8. If your strategy trades on news or at the session rollover, you live in the tail, and the average describes hours when you are not trading.
- The spread widens exactly when you need it not to. At the daily rollover, in the first seconds of a data release, and on Sunday’s open, spreads on majors can multiply several times over. A stop sitting inside that widening gets filled at a price that looks like an error and is not.
The practical check is to watch the spread on your own account, on your own pair, at the hours you actually trade, for a week. It is the only figure that applies to you.
Why the spread decides whether a strategy is viable
This is the part that matters more than the definition. Express the spread as a share of the target:
| Strategy target | Spread 1.2 pips | Spread 3 pips |
|---|---|---|
| 5 pips (scalping) | 24% of the target | 60% of the target |
| 20 pips (intraday) | 6% | 15% |
| 100 pips (swing) | 1.2% | 3% |
A system taking five pips needs the market to move 6.2 pips in its favour before it breaks even at a 1.2 pip spread, and 8 pips at a 3 pip spread. That is why the same rules can be profitable at one broker and losing at another without a single line changing, and why any short-term automated system that does not specify a maximum spread is incomplete.
A swing strategy barely notices the difference. Cost sensitivity is a function of how long you hold, not of how good the strategy is.
Spread and your stop
Two effects that surprise people:
- A buy is closed at the bid. Your stop loss on a long position triggers on the bid price, which is always below the quote you see on a standard chart. A widening spread can therefore reach your stop while the ask, the line on your chart, never got there.
- Brokers enforce a minimum distance. The stop level, visible in the symbol specification, is the closest a stop or limit can sit to the current price. On a broker with a wide stop level, a tight-stop strategy simply cannot be executed, and orders are rejected rather than placed badly.
Choosing an account type
- Hold for days, few trades: a standard variable account is usually fine, and the commission-free simplicity is worth something.
- Trade intraday, dozens of trades a month: compare all-in cost properly, including commission, on the pairs you actually trade.
- Scalp, or run a short-term automated system: raw or ECN is effectively a requirement, not a preference. On a standard account the strategy will not survive its own costs.
- Any automated system: check the minimum stop level as well as the spread, because it decides whether the orders can be placed at all.
What to read next
- Pips: the unit the spread is quoted in.
- Lots: converting a commission per lot into pips.
- MetaTrader: where to find the symbol specification and the stop level.
Frequently asked questions
Is a raw spread account always cheaper?
No. The comparison is spread plus commission against spread alone. A raw account at 0.2 pips with $7 per lot round turn costs about 0.9 pips on EUR/USD, against 1.4 on a standard account, so it wins there. The ranking can flip on pairs with naturally wider spreads or on smaller position sizes.
Why did my stop get hit when the chart never reached it?
Most charts plot the bid, and a long position is closed at the bid. A widening spread can push the bid down to your stop while the ask, which is the line you were watching, never got there. It is normal behaviour, not stop hunting.
What spread does a scalping strategy need?
Express the spread as a share of the target. A system taking 5 pips pays 24% of its target at a 1.2 pip spread and 60% at 3 pips. Short-term systems generally need a raw or ECN account, and any that does not specify a maximum spread is incomplete.
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