Closing a position at the same time but getting different profits usually comes down to actual fill prices affected by slippage and fees. Copy accounts executing market orders magnify this deviation.
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Two accounts execute a close order almost simultaneously, yet the final P&L doesn't match. The root cause isn't "one side was charged more" – it's that every fill happens at a slightly different price.
1. Understand How Each Account's Close Order Is Executed
On Binance copy trading, the close trigger logic is uniform: when the lead trader closes, the copy account simultaneously triggers a market order to close. But a market order means the fill price is determined by the order book depth at that instant – not a fixed price.
- The lead trader may use a limit or market order to close.
- The copy trader always closes with a market order.
Market liquidity at any given moment is limited. If the lead trader's close order eats into the order book, the copy trader's market order may need to walk further down (or up) the book to get filled, so the price will naturally differ.
2. Check Slippage: How Much Did Fill Prices Differ?
Slippage is the first thing to check when you see a P&L gap.
Step 1: Find the actual average fill price for both close orders
- What to do: Check the close order details for the lead trader and for your account separately.
- How to do it:
- Find the full close record in [Order History].
- If the market order was split into multiple small fills, sum the executed amounts and calculate the weighted average price.
- Don't rely on the "P&L %" figure – that's based on the mark price, not your actual fill price.
- When it's done: You have the actual average fill price for both accounts on that close.
Step 2: Calculate the price difference and its impact
- What to do: Subtract your fill price from the lead trader's fill price, multiply by your close quantity – that's the money lost to slippage.
- How to do it: If the price difference exceeds 0.1%, it means insufficient liquidity or execution timing gap caused a meaningful shift. In extreme markets, the gap can be much larger.
- When it's done: You can now attribute the bulk of the P&L gap to a specific slippage amount.
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3. Verify Fees: The Two Accounts May Have Different Fee Rates
Fees are calculated on notional value (position size × leverage). Even if your principal is smaller than the lead trader's, using higher leverage means your fee cost can be larger.
Step 3: Check the taker fee rate for both accounts
- What to do: Confirm whether the lead trader and you have the same contract taker fee rate.
- How to do it:
- The standard contract taker fee is 0.05%.
- If the lead trader has a higher VIP tier, uses BNB for fee discounts, or benefits from a referral rebate, their effective fee rate may be lower than yours.
- Since copy close orders are always market orders, they always incur the taker fee.
- When it's done: You have confirmed whether the fee rates match. If they differ, the gap directly impacts final P&L.
Step 4: Incorporate fees into your P&L calculation
- What to do: Work out exactly how much fee was charged on the close order.
- How to do it: Close fee = close notional value × taker fee rate. Note that the unrealized P&L displayed on a position excludes fees and funding payments. A trade that looks profitable may turn negative after closing.
- When it's done: After deducting fees and slippage, recalculate the net P&L and see if it matches what the account records show.
Prerequisites: You are comparing the same close trade between the lead trader and your account, with the close times only seconds apart.
Risk note: The lead trader may add margin to lower their liquidation risk, while a copy account's margin is fixed. If the copy account hits liquidation first, the liquidation fill price can be far worse than the lead trader's normal close price – causing an extreme P&L gap.
After these checks, how do you confirm where the difference comes from?
Put three data points side by side for both close orders: actual average fill price, fee amount, and slippage cost. If the combined difference matches the P&L gap shown in the accounts, the problem is at the execution level. If they still don't match, check whether funding rate deductions differed during the holding period, or whether one account had already been liquidated before the close.
