Why does the liquidation price change? I haven’t touched my position, so why has it moved closer on its own?
When trading futures, there’s one number that can really make you nervous: the liquidation price.
You check it when you open the position and see that it’s still a long way off, so you’re not too worried. Then you check again a little later—and it’s changed. Why?
“I didn’t add to my position, so why did the platform change my liquidation price?”
Don’t jump to conclusions just yet. Your liquidation price is usually calculated by the system based on your position, margin, and account risk. If any of the factors involved change, that number may change too.
This is especially true in cross margin mode: leaving the position untouched doesn’t mean the funds backing it haven’t changed.
Let’s first clarify what liquidation means.
Many people think liquidation means “the principal is completely lost, so the system closes the position for you.”
That’s not how it works. The platform requires a position to maintain a certain level of maintenance margin. If the margin falls below the required amount, liquidation may be triggered; the system won’t wait until your balance reaches zero. On Binance, for example, liquidation decisions also involve the mark price, not just the latest traded price you see.
You can think of maintenance margin as the minimum amount of money you need to keep this position open.
The liquidation price is the price level that, based on current conditions, the system estimates could trigger liquidation.
So it isn’t a number permanently fixed when you open the position.
The easiest changes to understand are adding money to or removing money from a position.
For a typical USDT-margined isolated long position, with position size, average entry price, and other conditions unchanged, adding margin will usually move the liquidation price lower; reducing margin will usually move it higher.
That’s because a long position is exposed to falling prices. With more money supporting the position, it can usually withstand a larger drop.
The direction is reversed for a short position: all else being equal, adding margin will usually move the liquidation price higher, leaving more room for the price to rise.
Note that we’re talking about adding margin here, not adding to the position.
Those are very different actions.
Adding margin means keeping the position size unchanged while putting in more money to support it. Adding to the position means buying or selling more contracts, which may change both the position size and the average entry price.
Some people see the market falling and keep adding to their long position:
“My average entry price is lower now, so the liquidation price should be safer too, right?”
Not necessarily.
Your average entry price may look better, but your position is also larger. If the price moves against you again, losses may grow faster; if you move into a new risk tier, the maintenance margin requirement may also increase.
Lowering your average entry price and reducing your risk are not the same thing. The liquidation price needs to be recalculated based on the position size, margin, and maintenance margin tier.
But what really confuses many people is this situation:
“I haven’t added margin or increased my position, so why has it changed?”
First, check whether you’re using isolated margin or cross margin.
Isolated margin mainly depends on the margin allocated to that position. If the margin, position, and relevant rules all remain unchanged, the liquidation price for a typical USDT-margined isolated position is usually fairly stable; it won’t necessarily move with every change in unrealized profit or loss.
Cross margin is different.
Funds in the same margin pool support the related positions together. Changes in the profits and losses of other positions may also affect the position you’re looking at.
Here’s an example.
You hold long positions in both BTC and ETH in the same cross-margin pool.
BTC hasn’t moved much, but ETH suddenly drops sharply, leaving you with a sizable unrealized loss. The account’s overall risk buffer shrinks, and the estimated liquidation price shown for your BTC position may move closer to the current price as a result.
You’re watching BTC and feel like you haven’t done anything.
But over in ETH, part of the account’s buffer has already been used up.
Conversely, increased profits on other positions may improve the overall margin situation. But those unrealized profits can still change, so you shouldn’t treat them as money that’s already locked in.
Similarly, funds transferred into or out of a cross-margin account, as well as realized losses and fees from other trades, may cause the liquidation price to be recalculated.
In cross margin, “I haven’t touched this position” doesn’t mean “the risk conditions for this position haven’t changed.”
There’s another factor that’s often overlooked: funding fees.
You may pay or receive funding fees on perpetual contracts. After settlement, if they change the margin balance supporting a position, they may affect its liquidation price.
However, you can’t make a blanket statement like “paying a funding fee will definitely change an isolated position’s liquidation price.” It depends on where the fee is actually deducted from, whether it affects the margin for that position, and what rules the account uses.
If you’re using a mode such as portfolio margin, you also need to pay attention to changes in the value of the collateral itself. If the value of the assets supporting your positions changes, your risk situation may change too.
At this point, someone might think: “Then if I lower my leverage from 20x to 10x, won’t that make things safer?”
Don’t focus only on the leverage shown in the interface.
What matters is whether the position became smaller or the actual margin increased after the adjustment.
If the position size hasn’t changed and the margin supporting it hasn’t changed either, simply changing a leverage setting doesn’t guarantee that the liquidation price will move farther away. The adjustments available and how funds are handled can also vary by mode, so check the platform’s rules.
Finally, let’s look at one more thing that’s easy to misread.
You’re watching the candlesticks and notice that the low doesn’t seem to have reached the liquidation price. So why was the position liquidated?
First, check whether the chart shows the latest traded price or the mark price. On Binance, for example, liquidations are primarily triggered based on the mark price, which may differ from the latest traded price you see. The liquidation trigger price and the final execution price may also differ.
So the next time you notice the liquidation price has changed, check the following:
Has the margin increased, decreased, or been added automatically?
Have you added to or reduced the position, or has the average entry price changed?
Are other positions in cross margin making a profit or a loss?
Has there been a funding fee settlement, a funds transfer, or a risk-tier adjustment?
Also, don’t breathe a sigh of relief right away just because the liquidation price has moved farther away.
If it’s because you added more money, that may indeed increase your buffer, but it also means more of your funds are exposed to the risk of this position. The original unrealized loss hasn’t disappeared.
The liquidation price tells you where your current risk boundary is, but it can’t decide for you how much this trade should lose before you close it.