The visible spread is only the first layer of a leveraged position’s cost. Commission, financing, currency conversion, dividend adjustments, and execution differences can all change the net result. Their importance depends on the instrument, holding period, account currency, and time of entry.
A contract for differences should be evaluated using an expected net return, not the distance between entry and target alone. Five cost checks show whether the intended market move is large enough to justify the chosen exposure.
Spread Creates an Immediate Hurdle
Buying occurs at the ask and selling at the bid, so a new position begins behind by roughly the spread. The gap can vary by session and market condition. A target that looks attractive under the minimum advertised spread may offer little reward during the hours when the strategy actually trades.
Record typical, median, and stressed spreads where data are available. One best-case figure is not a usable cost assumption.
Commission Depends on the Charging Basis
Some products include compensation in the spread; others charge commission per side, per lot, or by notional value. The round-trip amount matters. Minimum ticket charges can make small positions proportionally expensive even when the published rate looks low.
Compare costs using the same position size and holding period rather than comparing fee labels.
Financing Accumulates Against Notional Exposure
Overnight charges usually apply to the full position, not merely to margin deposited. Rates can differ for long and short exposure and may include a provider adjustment. Multi-day charges around weekends or holidays can make one rollover more expensive than an ordinary night.
A slower strategy can pay more in financing than a high-turnover method pays in commissions.
Conversion Can Reduce a Correct Market Result
Suppose an account is denominated in pounds and opens a US equity position whose profit is calculated in dollars. The shares rise enough to generate a $300 gain, but the dollar weakens before conversion and the provider applies a conversion markup. The credited sterling amount is smaller than the chart-based estimate.
When using a contract for differences on foreign markets, account currency becomes part of the result even if currency direction was not included in the original thesis.
Adjustments and Slippage Complete the Net Calculation
Index dividend adjustments, corporate actions, borrow charges on short shares, and slippage at entry or exit can alter the final figure. Some adjustments are credits rather than charges, but they should still be forecast because they affect cash balance and break-even.
The cost mix changes with strategy design. A rapid method is usually more sensitive to spread and commission, while a position held for weeks gives financing and corporate adjustments more time to accumulate. Comparing providers with one generic “total fee” can therefore be misleading. Run the calculation using the intended frequency, average holding time, and typical instrument instead of assuming the cheapest schedule is universal.
Calculate the full round-trip cost for the intended size and maximum holding period, including a stressed exit fill. Subtract it from the target in cash terms. Do not open the position if the remaining reward falls below the plan’s required ratio.
Create a pre-trade cost sheet with spread, round-trip commission, projected financing through the maximum holding date, conversion markup, scheduled adjustments, and a stressed slippage estimate. Subtract the total from the planned reward. If the remaining reward no longer compensates for the defined loss, reject the position before opening it.