The copy trading amount you set is only a "budget limit", not the final actual order amount. The system deducts opening losses, slippage buffer, and risk control discounts. The actual amount spent is always lower than the set value. This is not a platform error. It is designed to help your order get filled normally and avoid liquidation due to insufficient margin.
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Step 1: Understand How "Fixed Amount" and "Ratio Copy" Reduce the Amount Differently
The two modes work completely differently. First identify which one you are using.
Case A: You Use Fixed Amount Copy Trading
How it works: You set 20 USDT per order and 60 USDT total copy trading amount. Each time a copy trade is triggered, the system calculates the order quantity based on 20 USDT.
Why the actual amount is lower:
Not enough margin for the next order: For example, your account only has 15 USDT available, but your per-order setting is 20 USDT. The system will use the remaining 15 USDT to open the position instead of rejecting the order. If it is below the minimum order threshold, the order may fail directly.
Ratio limit between per-order amount and total amount: With a total amount of 60 USDT and 20 USDT per order, you can only hold 3 copy trades at the same time. Once full, new orders will be blocked or reduced.
How to check: In [Current Orders], check the actual opening margin of this copy trade. It will be smaller than your set per-order amount.
Case B: You Use Ratio Copy Trading
This is where the reduction is most obvious and where most confusion comes from.
How it works: The logic of ratio copy trading is: if the lead trader uses 50% of their account funds to open a position, the system will calculate your order quantity based on 50% of your total copy trading amount. But this 50% is not multiplied directly. An extra discount is applied.
Official formula (Source: Binance Copy Trading Rules):
Copy order cost = min(Order ratio × Copy margin balance × Position ratio, Discount factor × Copy margin balance)
The Discount factor is the key. The formula is:
Discount factor = {(1-S)/(1-S+L×S)} × 0.98
Here S is the maximum opening slippage (default 1%), and L is the leverage multiple.
Example: The lead trader has 1,000 USDT margin and uses 500 USDT to open a position (ratio 50%). Your total copy trading amount is 500 USDT.
In theory, you should use 250 USDT to open the position
But after applying the formula, the discount factor is about 0.813
Actual order cost = 500 × 50% × 0.813 = 203.25 USDT
That is nearly 20% less than 250
This is why the "actual order amount" you see is always lower than the "amount calculated by ratio". The fixed 0.98 discount and the slippage factor reduce part of it.
How to check: After the copy trade succeeds, check the actual filled margin in [Current Orders] or [Order History]. Compare it with the theoretical value calculated by ratio to confirm the reduction.
Step 2: Besides the Discount Factor, 5 Other Situations Can Reduce the Amount
Binance officially lists the following situations where the order cost will be lower than your set value:
| Reason for Reduction | Explanation |
|---|---|
| IOC limit order partially filled | The limit order was not fully filled. Only part of it was filled, so the copy amount is naturally smaller |
| Insufficient margin in fixed amount mode | When the account balance is not enough for the per-order setting, the system uses all remaining funds to open the position |
| Exceeded maximum notional value for the leverage | The order amount exceeds the maximum position allowed under that leverage, so the system opens at the upper limit |
| Copy ratio reached the 80% threshold | Risk control is triggered, and the system applies an extra 0.97 factor to prevent margin check failure |
| Exceeded 80% of market depth | Your order is too large and would consume too much of the order book. The system automatically controls the opening within 80% |
Many people think the reduction is a system problem and repeatedly cancel and reopen orders. That does not help. The reduction is caused by hard indicators such as account balance, leverage multiple, and market depth. Retrying cannot solve it. The correct approach is to either increase the total copy trading amount or lower the per-order setting to match your actual account balance.
Step 3: If You Want to Reduce the Gap — Three Adjustment Directions
How to adjust:
Increase the total copy trading amount: Make your account balance much larger than the per-order setting. The absolute reduced amount may still exist, but its proportion becomes smaller. Many users suggest keeping the total copy trading amount above 200 USDT for better stability.
Lower leverage: In the discount factor formula, higher leverage leads to a stronger discount. Lower the leverage and the factor will be closer to 1, so the actual order amount will be higher.
Switch to fixed amount copy trading: If the reduction affects you significantly, you can switch to fixed amount mode. Each order amount is fixed and not affected by the discount factor. But make sure your account balance is enough to support the per-order setting.
How to check: After adjusting, trigger a new copy trade. The actual order amount should be closer to your target value than before the adjustment.
How to Verify After Making Changes
Go to [Copy Trading] → [Current Orders] or [Order History] and check the newly copied order. The gap between the actual filled margin and your set value should be within an acceptable range. If you made adjustments such as adding funds or lowering leverage, the actual order amount of the new copy trade should be larger than before.
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FAQ
Question: Why is it easy to use the full balance when copy trading coins like Bitcoin with a small amount?
Answer: BTC has a minimum order quantity limit, usually 0.001 BTC, which is about 50 USDT. If the copy trading amount is too small, the system may use all your available balance to reach the minimum order threshold. This can lead to a full position or even liquidation. So it is better not to set the copy trading amount below 200 USDT.
Question: If a copy trade fails, will the deducted margin be refunded?
Answer: If it fails, nothing is deducted. If the order is rejected due to insufficient margin or failure to meet the minimum order quantity, your funds will not be taken and will remain in your account. After 5 consecutive failures, the copy trading project will be automatically closed.
