Bid, Ask, and the Price That Closes Your Trade

Suppose a practice screen quotes EUR/USD at 1.1040 bid and 1.1043 ask. Under the ordinary two-way quoting convention, the bid is the price available to someone selling the base currency, and the ask is the price available to someone buying it, subject to execution conditions. The 0.0003 difference is three pips when a pip is 0.0001.

A chart may display the bid, ask, midpoint, or traded prices from a particular venue. Find that setting before comparing the chart with an execution. Otherwise you may compare a price for buying with a line representing selling and mistake the difference for a market movement. Record whether a quote is indicative, delayed, or intended for execution. That status affects which comparison can reasonably be made with a subsequent order fill.

A long position starts by buying the base currency. In our fictional unchanged quote, buying 10,000 euros uses the 1.1043 ask. Closing that long means selling the same exposure, so the relevant side is the bid. An immediate sale at 1.1040 gives a gross loss of $3 before additional costs.

Now suppose the later quote is 1.1050/1.1053. Selling at the later 1.1050 bid gives a difference of 0.0007 dollars per euro from the actual ask entry. For 10,000 euros, the gross gain is $7. The bid chart rose ten pips, but this executed round trip captured seven under the stated assumptions.

A short position begins by selling the base currency, using the bid. Selling 10,000 euros at the initial 1.1040 bid and later buying back at a hypothetical 1.1033 ask gives a difference of 0.0007 dollars per euro, or $7 before costs. The short closes with a buy even though its original direction was down.

If instead the market remained at 1.1040/1.1043, the short would buy back at 1.1043 and lose $3. Both immediate round trips pay the spread under these fixed-quote assumptions. Neither direction receives a free entry simply because the chart starts at the bid.

A stop or limit instruction introduces another question: what price triggers it? A platform may apply bid, ask, last-trade, or other specified rules depending on the product and order. Read those rules rather than assuming the visible candle is the trigger series. A widening spread can affect one side without the other side touching a chart level.

For example, a short position is closed by buying. If the applicable stop rule watches the ask, an ask spike may matter even when a bid-only chart appears below the stop level. That possibility explains a question to investigate; it does not prove that any particular disputed execution was correct.

A displayed quote records a moment. An order reaches the execution system later, and the available price or quantity may have changed. NFA's US forex guidance describes slippage and requoting and distinguishes ordinary delays from problematic asymmetric practices. Its rules apply within their own regulatory scope; they are not a universal promise about every account.

When investigating a fill, preserve the order time, receipt time if available, direction, quantity, order type, bid and ask reference, actual fill, and platform response. A screenshot without its timezone or quote basis may be insufficient. Differences between independent feeds also require a careful comparison of instruments and timestamps.

Use actual executed prices first. For a long, gross P/L in the quote currency is quantity multiplied by exit bid fill minus entry ask fill. For a short, reverse the price subtraction: entry sell fill minus exit buy fill. Then apply separately charged commission, financing, and any account-currency conversion.

If you calculate with actual opposite-side entry and exit prices, the spread is already reflected. Subtracting an estimated full spread again would double-count it. If you model a strategy using midpoint prices, however, an explicit cost assumption is needed. State which method you used so the calculation can be reproduced.

Before a practice trade, write four phrases: buy to open long, sell to close long, sell to open short, and buy to close short. Beside each phrase, put the applicable quote side. Then take one hypothetical unchanged quote and calculate the immediate result for both directions. This simple exercise reveals confusion before position size makes it expensive.

Finally, verify that the statement and chart describe the same product and period. A correct arithmetic formula cannot repair a mismatched instrument, an omitted fee, or an assumed fill. The aim is an explainable transaction record, not a justification for every price discrepancy.