Why was my Binance order partially filled?

Understanding Partial Fills on Binance

When you place an order on Binance, it may be executed in full or partially, depending on market conditions. A partial fill occurs when only a portion of your order is matched with available buyers or sellers at the specified price. This typically happens in markets with low liquidity or when large orders are placed without sufficient matching volume.

For example, if you place a buy order for 10 BTC at $30,000, but there’s only 2 BTC available at that price, then only 2 BTC will be purchased immediately, and the remaining 8 BTC will remain open until more matching orders appear.

How Market Orders Can Result in Partial Execution

Market orders aim to execute instantly at the best available price. However, even these can experience partial fills due to order book depth limitations. When placing a market buy order, the system pulls from the lowest ask prices first. If the total amount you're buying exceeds what's available at each price level, the order gets filled progressively — often across multiple price points.

This means that larger market orders may trigger slippage and partial execution as the exchange exhausts available liquidity at favorable prices before completing the trade.

Limit Orders and Liquidity Constraints

Limit orders allow traders to set specific entry or exit points. However, they may not get fully filled if the market price doesn't reach the limit price or if there isn’t enough counterparty interest. For instance, placing a sell limit order at $35,000 when the current market price is $34,900 may result in no immediate execution.

In such cases, the order sits in the order book waiting for a buyer willing to match or exceed the seller’s price. The availability of liquidity at that price level determines whether the order gets fully or partially filled.

Order Size vs Available Market Depth

One of the most common reasons for partial fills is the mismatch between order size and available market depth. Market depth refers to how much volume is available at various price levels. If your order is larger than the available depth at your target price, only part of your trade will go through.

To check this, you can view the order book (Depth Chart) on Binance. It shows real-time bids and asks along with their corresponding volumes. By analyzing this chart before placing trades, you can better understand whether your order might result in a partial fill.

Time-in-Force Settings and Their Impact

The Time-in-Force (TIF) setting on Binance also influences whether an order gets partially filled. There are three main options:

• GTC (Good-Til-Canceled): Keeps the order active until filled or canceled.
• IOC (Immediate-or-Cancel): Executes whatever can be filled immediately and cancels the rest.
• FOK (Fill-or-Kill): Requires the entire order to be filled at once; otherwise, it gets canceled.

If you use IOC or FOK and the full amount isn’t available, the outcome will either be a partial fill (IOC) or no execution at all (FOK). Choosing GTC gives your order time to get filled completely as new liquidity appears.

Frequently Asked Questions

What happens to the unfilled part of my order?

The unfilled portion remains in the order book if your Time-in-Force setting allows it (like GTC). It will continue to wait for a matching order at your specified price.

Can I cancel the remaining part of a partially filled order?

Yes, you can manually cancel the unfilled portion from the Open Orders section on Binance. Simply locate the order and click “Cancel.”

Does a partial fill affect trading fees?

No, fees are only applied to the executed portion of your order. You won’t be charged for the unfilled part.

Why did my stop-limit order only get partially filled?

Stop-limit orders become active only when the stop price is reached. Once activated, they act like regular limit orders. If the market moves quickly past your limit price, only part of the order may be filled before the price moves away.