Definition of “raw spread” and where costs show up
A “raw spread broker” is typically described as a model where the quoted spread is kept relatively tight, while the broker or trading venue charges other costs—commonly a commission per trade. The important idea is not the label, but the cost structure: some costs are direct and contract-like (fees), while others are variable and market-like (execution and pricing conditions).
In cost terms, the total cost of a trade is often the combination of:
- Direct charges: commissions, account or trading fees, and sometimes swap/financing charges.
- Spread/price impact: the difference between bid and ask, and any additional slippage between requested and filled prices.
- Execution and operating effects: changes caused by volatility, liquidity, and how orders are processed.
Direct costs: fees you can usually verify from documents
When comparing “raw spread” style offers, focus on the items that are usually written in pricing schedules or account terms. These are the costs you can often verify without relying on future market outcomes.
Common direct cost components include:
- Commission per trade (sometimes expressed per lot, per unit, or per order).
- Non-trading fees such as inactivity charges, account fees, or platform-related charges (only if clearly stated).
- Financing (swap/rollover) charges if positions are held beyond a settlement cut-off.
- Withdrawal or funding-related fees if the account includes them.
Assumption for any calculation: you need the fee definitions (e.g., commission per unit) and your trade size, because the total changes with volume.
Indirect or variable costs: what can change even when fees are fixed
Even if commission and stated fees are fixed, the effective cost can still vary. This is where variability matters.
Material variable factors can include:
- Market spread changes: spreads widen during fast moves.
- Slippage: the fill price differs from the quoted or expected price, especially for market orders.
- Liquidity conditions: thin liquidity can increase price impact.
- Order handling: partial fills, delays, and routing can affect the realized price.
Failure mode example: if you compare only commission and ignore slippage and spread widening, you may underestimate the total cost during volatile periods.
Evidence and examples: separating “stable fee terms” from “variable effects”
A simple way to verify total trading cost (without needing live market data) is to treat the components separately:
- Get fee terms from account documentation: commission rates, swap/financing rules, and any fixed account charges.
- Use an assumed trade for illustration: choose a trade size and assume a spread level and slippage amount.
- Compute “example total cost” with stated assumptions:
- Trading cost ≈ (commission for the trade) + (spread component based on the assumed spread) + (slippage based on the assumed slippage).
Assumptions must be stated: otherwise you cannot tell whether the cost estimate reflects typical conditions or a particular scenario.
Limitations and risks in cost comparisons
Several limitations can make comparisons unreliable:
- Outcomes vary with market conditions, execution, and order type. Stable fee schedules do not guarantee stable realized costs.
- Historical relationships do not establish future results. Even if past trades looked cheap, future volatility can differ.
- Different definitions: some documents define costs differently (per lot vs per unit; “commission” vs “markup”), so you may compare items that are not the same.
A key risk is focusing on one number (e.g., “raw spread” width) while ignoring other cost components that may dominate in certain conditions.
How to verify independently and what to ask next
To verify relevant facts independently, use the broker’s published terms as the primary source for the stable parts:
- Confirm commission structure and how it scales with trade size.
- Confirm swap/financing charge rules (what triggers them).
- Confirm whether any additional trading or account fees apply.
- Clarify how fills are reported so you can reconcile realized prices against expected prices.
Next question to consider: which order types and execution conditions you plan to use, because that changes how variable costs (spread changes and slippage) appear in your realized trade results.