What it means
When you decide to buy or sell an asset, the price you see on your screen is usually just an estimate or the most recent trade price. The execution price is what you actually pay or receive when the order is fulfilled.
In fast-moving markets, the price can change in seconds between placing your order and its completion. This difference is known as slippage.
For non-finance managers, understanding this concept is vital when dealing with corporate investments, share buybacks, or foreign exchange conversions. It ensures that your financial planning accounts for the reality of market friction rather than just theoretical values.
Several things cause the gap. Large orders can push the price against you because they use up the cheapest offers first, and there is always a small difference between the price buyers will pay and the price sellers will accept.
Fees and commissions are charged on top, so your true cost is always a little higher than the execution price alone. You can control some of this risk.
A market order is filled straight away at the best price available, while a limit order sets the worst price you will accept but may not be filled at all. Splitting a large purchase into several smaller orders over a few days can also reduce the effect on the price.
Always look at the final confirmation statement rather than the initial quote to see your true costs. It is like ordering a taxi on a ride-sharing app where the estimated fare is $10, but due to heavy traffic on your journey, the final price you pay at drop-off is $12.
In practice
Real-world examples
Example 1
TechStart Ltd placed an order to buy 1,000 shares of a supplier at $5 each. Due to sudden market demand, the execution price was $5.15, costing the firm an extra $150. The finance team compared the confirmation with the planned $5,000 and recorded the difference as a cost.
Example 2
Brighton Bakery converted EUR 10,000 into dollars to pay for new ovens. While the quoted rate of $1.10 per euro implied $11,000, the execution price was $1.095 per euro, so only $10,950 arrived. The bakery was $50 short of its budget and had to cover it from working capital.
Example 3
Green Logistics sold surplus delivery vans at auction. The guide price was $15,000 each, but fierce bidding meant the final execution price reached $16,200 per vehicle. On ten vans, that is $12,000 more than planned, a favourable result in this case.
Think of it
It is like ordering a taxi on a ride-sharing app where the estimated fare is 10 pounds, but due to heavy traffic on your journey, the final price you pay at drop-off is 12 pounds.
Formula
Calculation
Total Cost = (Number of Units x Execution Price) + Transaction Fees
Slippage per Unit = Execution Price - Expected Price (for a purchase; reverse the order for a sale)
Example 1: buying 500 shares at an execution price of $10 each, plus a $50 broker fee, costs (500 x $10) + $50 = $5,050.
Example 2: you expect to buy 2,000 shares at $20.00, but your order fills at an average of $20.10. Slippage per share = $20.10 - $20.00 = $0.10. Total slippage = 2,000 x $0.10 = $200, which is 0.5% of the expected cost of $40,000. With a $60 broker fee, the total cost is (2,000 x $20.10) + $60 = $40,260, compared with the $40,000 you planned for.Case study
Seen in the real world
This is a fictional, illustrative scenario. Oakwood Manufacturing decided to repurchase 10,000 of its own shares to return surplus cash to shareholders. The finance director budgeted $50 per share based on the closing price from the previous evening, expecting a total outlay of $500,000. However, when the broker executed the large block trade the next morning, market excitement pushed the share price higher. The final execution price averaged $52.50 per share.
Consequently, the total cost for the share buyback rose to $525,000, exceeding the initial budget by $25,000, or 5%. This variance taught the finance team to factor potential price movement into their cash flow forecasts when executing large transactions. For the next buyback, Oakwood set a limit price and spread the purchase over several days in smaller lots. The average execution price came in at $50.80, so 10,000 shares cost $508,000, only $8,000 above the original plan. The illustrative lesson is that planning how an order is executed matters as much as deciding what to buy.
Watch out
Common mistakes
- Assuming the quote price on your screen is guaranteed to be your final execution price.
- Forgetting to include transaction fees and broker commissions alongside the execution price.
- Failing to budget for price slippage when executing large volume orders in volatile markets.
Questions
People also ask
Why is my execution price different from the price I saw?
Markets move constantly. By the time your order reaches the market and finds a match, the price may have risen or fallen.
Can I guarantee my execution price?
You can use limit orders to specify the worst price you are willing to accept, though this means your order might not be filled at all.
Does execution price affect company accounting?
Yes, assets must be recorded on the balance sheet at their actual historical cost, which is based on the execution price, not the quoted price.