Reconcile forex trading costs from fills and fees

For an executed trade, start with the fill prices and the fees posted separately on the account. This guide explains how to reconcile those records and compare costs across trade sizes. A spread already represented in the buy and sell prices must not be deducted again. Use the companion pricing guide to compare account tariffs before trading.

What spread really is

The spread is ask minus bid at the same moment. Hypothetical EUR/USD bid 1.08500 and ask 1.08515 differ by 0.00015, or 1.5 pips when a pip is 0.0001. Buying and immediately valuing at the unchanged bid shows that spread loss before other costs. With unchanged spread, a 1.5-pip rise in the bid from its original level brings the long’s price P/L to zero. A changed spread, costs or different execution can alter the break-even; the market is not required to move exactly that amount in every trade.

The spread is baked into the quote — the broker does not list it as a separate line on your account, unlike commission. For that reason it is often called a "hidden cost", though in truth it is perfectly visible to anyone who knows where to look. On a pair quoted against the dollar (EUR/USD, GBP/USD, AUD/USD) one pip is worth 10 USD on a standard lot. On cross pairs and on instruments such as XAU/USD the pip value is calculated differently and is worth confirming with your broker before placing the first trade. A related puzzle that catches many traders off-guard: why the profit on a closed position is lower than the price move multiplied by the lot size — the article on why my profit is smaller than the price move times position size explains the mechanics in full.

What broker commission really is

Commission is an explicit charge whose rate, unit, minimum and booking time depend on the account and symbol. It may be charged on entry, exit, both or as a separate operation. For the calculations below, assume a hypothetical USD 7 round-turn charge per standard EUR/USD lot; this is not a current broker quote or a universal retail benchmark.

Separate pricing from counterparty and hedging arrangements

A market maker can be the legal counterparty while hedging some or all exposure externally. A spread-only tariff does not prove that every client trade remains unhedged in a B-book.

XTB and Plus500 are examples of brands offering retail CFDs. Obtain the current entity’s spread schedule and execution policy; an undated spread range is not a comparable offer.

A spread-only tariff simplifies one part of the comparison, but financing, currency conversion and other charges can still apply. Calculate the complete cost for the intended holding period.

Read the spread-plus-commission tariff

An ECN or STP label describes connectivity or routing arrangements, not necessarily the legal counterparty or the provider’s entire exposure. Read the execution and hedging disclosures; conflicts can exist even where orders are routed to liquidity providers.

Read the current raw-account commission, charging unit, minimum and currency for your entity. Compare it with observed spreads for the same symbol, order size and trading hours; this article’s examples are assumed rates rather than verified broker offers.

The maths of the comparison: when each model wins

In the selected linear EUR/USD model, the contract is EUR 100,000 per lot and one pip is 0.0001, giving USD 10 per pip per lot in a USD account. The assumed USD 7 round-turn commission equals 0.7 pip; adding the assumed 0.2-pip spread gives 0.9 pip. This is the spread-only equality point for those two assumed tariffs, not a universal ECN threshold. Check minimums, volumes, matched quote observations and other costs before applying it.

In the illustrative model, compare the combined commission and raw-spread cost with the alternative spread. Real break-even depends on the actual tariff and execution conditions; the example is not a general estimate of market-maker or ECN pricing.

When the market maker is actually cheaper

A spread-only account may cost less under some tariffs. Check the following factors rather than assuming a universal account winner.

• Small orders. A minimum commission can affect the effective rate for small positions. Verify whether one applies and calculate its cost at your actual order size.
• Holding period. Compare financing as well as entry and exit charges. Few trades do not, by themselves, prove that a spread-only account is cheaper.
• Exotic pairs. Compare current quotes and commissions for the same pair and time. An account label does not establish a stable spread range or a cheaper result.

When a commission tariff may cost less

A commission account may cost less for your trades if its combined charges and execution are better. Evaluate the following cases using the actual tariff.

• Short holding periods. Compare total entry and exit cost, execution quality and order restrictions. Lower cost helps a strategy’s arithmetic but does not establish that it is profitable.
• Gold and indices. Use the symbol’s contract size and price increment to convert spread and commission into the same account currency. Do not compare unmatched quote units.
• Macro releases. Spreads, liquidity and slippage can change on either account model. Observe matched order records; neither model guarantees a narrow spread during news.
• Higher turnover. Multiply the measured per-trade cost difference by planned volume. There is no universal threshold of 30 lots or guaranteed annual saving.

Five mistakes that cost retail traders money

1. Substituting an advertised minimum for your trading observations. A “from” figure does not establish the average for your symbol, size and hours, nor prove that the value appeared at least once each day. Keep dated observations and matched order records; no twofold or threefold spread multiple is established here.
2. Ignoring commission. A quoted zero spread does not mean a free round trip when commission or other charges apply. Use the current account tariff.
3. Assuming the account label fits a trading style. Compare actual spread, commission, financing and execution for your strategy rather than inferring the cheaper choice from trade frequency.
4. Ignoring ancillary fees. Include applicable inactivity, conversion, withdrawal and financing charges from the current tariff. Do not apply generic fee rates to an unidentified account.
5. Failing to reconcile the records. Identify the fill prices, volume, currency, separately posted commission and financing, and whether an export is already net. Include deposits and withdrawals when reconciling balances. Three generic spreadsheet columns are not sufficient for every instrument or multi-currency account. Avoid subtracting spread already embedded in price P/L.

Summary

The illustrative model shows how to compare a spread with commission expressed in equivalent pips. Its break-even is an assumption-based result, not a universal market threshold. Use actual prices, commission units and holding costs, and do not subtract costs already included in platform P/L twice.

A minimum commission can reverse the answer for small positions. In a separate hypothetical USD EUR/USD model, A costs 12 × L; B costs 2 × L + 2 × max(3.50 × L, 0.10), where L is lots and USD 0.10 is the invented minimum per side. At 0.01 lot costs are USD 0.12 and USD 0.22; at 0.02 both are USD 0.24; at 0.03 they are USD 0.36 and USD 0.27. The minimum stops binding around 0.02857 lot, which differs from the 0.02-lot equality point. Actual minimum units and rounding can change this calculation. No “most common” mistake ranking or universal order of broker-versus-strategy optimisation is established.

Related reading: ECN vs market maker — full mechanics, fixed spread versus variable spread, spread vs commission — how to count broker cost.