How Crypto Liquidation Works (and How to Avoid It)

# How Crypto Liquidation Works (and How to Avoid It)

If you're borrowing against your crypto assets — whether on a DeFi protocol like Aave or a centralized platform like Nexo — understanding liquidation is not optional. It's the most important risk management concept in crypto lending.

Liquidation is the process by which your collateral is forcibly sold when its value drops too low relative to your loan. It can happen quickly, it comes with penalties, and it's one of the most common ways people lose money in crypto lending.

This guide explains exactly how liquidation works, what triggers it, how much it costs, and — most importantly — how to avoid it.

Risk Warning: Borrowing against crypto collateral exposes you to liquidation risk. In volatile markets, liquidation can happen within minutes. You can lose a significant portion of your collateral, including the liquidation penalty. Never borrow more than you can afford to have liquidated.

What Is Liquidation?

In crypto lending, liquidation occurs when a borrower's collateral is sold (partially or fully) to repay their outstanding loan because the value of the collateral has fallen below a required threshold.

Here's the basic scenario:

1. You deposit $10,000 worth of Ethereum as collateral.
2. You borrow $6,000 worth of USDC against it.
3. Ethereum's price drops 30%, making your collateral worth only $7,000.
4. Your collateral is now dangerously close to the value of your loan.
5. The protocol or platform liquidates your position — selling enough of your Ethereum to repay the loan and cover the liquidation penalty.

After liquidation, you keep the borrowed USDC, but you've lost a significant portion of your Ethereum collateral. Depending on the severity of the price drop and the liquidation penalty, you could lose substantially more than the original price decline.

Key Terms You Need to Know

Before diving into mechanics, let's define the essential terms:

Loan-to-Value Ratio (LTV)

The LTV ratio represents how much you've borrowed relative to the value of your collateral.

Formula: LTV = (Loan Value / Collateral Value) x 100

Example: If you deposit $10,000 in collateral and borrow $5,000, your LTV is 50%.

A higher LTV means you're borrowing more relative to your collateral and are closer to liquidation. A lower LTV means you have more cushion.

Liquidation Threshold

The liquidation threshold is the LTV level at which your position becomes eligible for liquidation. Different platforms and protocols set different liquidation thresholds, and these vary by asset.

Example: On Aave, the liquidation threshold for ETH as collateral is typically around 82.5% (as of early 2026 — always check current parameters, as they can be updated through governance). This means if your LTV rises above 82.5%, your position can be liquidated.

Health Factor

The health factor is a metric used by DeFi protocols (particularly Aave) to indicate how safe your position is.

Formula: Health Factor = (Collateral Value x Liquidation Threshold) / Total Borrows

• Health Factor > 1: Your position is safe (for now).
• Health Factor = 1: You're at the liquidation threshold. Liquidation can begin.
• Health Factor < 1: Your position is being liquidated.

Example: If your collateral is $10,000, the liquidation threshold is 82.5%, and you've borrowed $5,000:

Health Factor = ($10,000 x 0.825) / $5,000 = 1.65

A health factor of 1.65 means you have significant buffer. But if ETH drops 40%, your collateral becomes $6,000:

Health Factor = ($6,000 x 0.825) / $5,000 = 0.99

Now your health factor is below 1, and liquidation can occur.

Maximum LTV vs. Liquidation Threshold

These are two different numbers, and confusing them is a common mistake:

• Maximum LTV is the most you're allowed to borrow against your collateral when opening a position. On Aave, this might be 80% for ETH.
• Liquidation Threshold is the LTV at which liquidation begins. This is slightly higher — perhaps 82.5%.

The gap between these two numbers is your initial safety margin. If you borrow at the maximum LTV, you have very little room before liquidation.

How Liquidation Works in DeFi

On Aave

Aave is one of the most widely used DeFi lending protocols. Here's how liquidation works:

1. Monitoring: Aave continuously monitors the health factor of every borrowing position on the protocol. This happens on-chain and is visible to everyone.
2. Trigger: When a position's health factor drops below 1.0, the position becomes eligible for liquidation.
3. Liquidators: Liquidation on Aave is performed by third-party liquidators — automated bots or sophisticated traders who monitor the protocol for liquidation opportunities. They are financially incentivized to perform liquidations.
4. Partial liquidation: On Aave, liquidators can repay up to 50% of a borrower's debt in a single liquidation transaction (the "close factor"). This means liquidation may not wipe out your entire position at once — but it will take a significant portion.
5. Liquidation bonus: The liquidator receives a bonus — typically 5% to 10% of the liquidated collateral, depending on the asset. This bonus is what incentivizes liquidators to perform the service, and it comes directly out of the borrower's collateral.

Example on Aave:

• You deposit 5 ETH (worth $10,000 at $2,000/ETH) and borrow 4,000 USDC.
• ETH drops to $1,200, making your collateral worth $6,000.
• Your health factor drops below 1.0.
• A liquidator repays up to 2,000 USDC of your debt.
• In return, the liquidator receives approximately $2,100-$2,200 worth of your ETH (the repaid amount plus the liquidation bonus).
• You still owe the remaining debt, and you've lost a portion of your ETH collateral plus the penalty.

On Compound

Compound operates similarly to Aave but uses different terminology:

• Compound uses a concept called "shortfall" — when a borrower's total borrows exceed the value of their collateral adjusted by the "collateral factor."
• Liquidators can repay up to a defined "close factor" (typically 50%) of the outstanding borrows.
• Liquidators receive a liquidation incentive (typically 8%) as compensation.

On MakerDAO (Sky)

MakerDAO (rebranded as Sky) uses a different liquidation mechanism:

• Collateral is liquidated through auctions rather than fixed-price liquidations.
• When a vault (borrowing position) drops below the required collateralization ratio, the collateral is put up for auction.
• Bidders compete to purchase the collateral, which can sometimes result in better outcomes for the borrower than fixed-price liquidations.
• However, during extreme market events (like the March 2020 crash), auction mechanisms have experienced problems when network congestion prevented bidders from participating.

How Liquidation Works in CeFi

Centralized platforms handle liquidation differently from DeFi protocols, and the specifics vary by platform.

General CeFi Liquidation Process

1. Margin call: When your collateral value drops to a predefined level, many CeFi platforms issue a margin call — a notification that you need to add collateral or repay part of your loan.
2. Grace period: Some platforms provide a grace period (hours or days) to respond to a margin call by adding collateral or repaying debt.
3. Forced liquidation: If you don't respond to the margin call within the grace period, or if the price drops too rapidly, the platform liquidates your collateral.

CeFi vs. DeFi Liquidation Differences

| Feature | DeFi | CeFi | |---------|------|------| | Speed | Instant (no warning) | May include margin call and grace period | | Transparency | Fully on-chain, visible to everyone | Opaque — you see your own position but not others | | Who liquidates | Third-party bots/traders | The platform itself | | Predictability | Rules are in the smart contract code | Rules are in Terms of Service (can be changed) | | Partial vs. full | Usually partial (up to 50%) | Varies by platform |

Important: Just because a CeFi platform mentions margin calls doesn't mean you'll always receive one before liquidation. In rapidly falling markets, many platforms reserve the right to liquidate without prior notification if your position deteriorates quickly enough.

What Triggers Liquidation

Several scenarios can push your position toward liquidation:

1. Collateral Price Drops

The most common trigger. If you've borrowed against ETH and ETH's price drops significantly, your LTV increases and your health factor decreases.

How fast can it happen? In crypto markets, prices can drop 10-20% or more in a single day. During extreme events:

• On May 19, 2021, Bitcoin dropped approximately 30% in a single day.
• During the March 2020 "Black Thursday" crash, ETH dropped over 40% in 24 hours.
• These events triggered hundreds of millions of dollars in liquidations across DeFi protocols.

2. Borrowed Asset Price Increases

If you borrow a volatile asset (not a stablecoin), and the price of that asset increases while your collateral stays flat or drops, your LTV increases. This is less common since most borrowing is in stablecoins, but it's a risk for those borrowing volatile assets.

3. Accruing Interest

Interest on your loan accrues continuously. Over time, this increases the total amount you owe, which gradually increases your LTV. While this is usually a slow process, it can compound with price movements to push a position closer to liquidation.

4. Oracle Failures or Delays

DeFi protocols rely on price oracles to determine collateral values. If an oracle provides an incorrect price (due to manipulation, delay, or malfunction), it can trigger inappropriate liquidations or prevent necessary ones.

5. Network Congestion

During market crashes, blockchain networks often become congested as many users try to add collateral, repay loans, or make trades simultaneously. If you can't get a transaction confirmed in time to improve your health factor, liquidation may proceed.

Liquidation Penalties

Liquidation is not just inconvenient — it's expensive.

DeFi Liquidation Penalties

On most DeFi protocols, the liquidation bonus (from the liquidator's perspective) is the liquidation penalty (from the borrower's perspective):

• Aave: Typically 5-10% depending on the asset. For example, the liquidation bonus for ETH collateral is approximately 5%, while more volatile assets may have higher penalties.
• Compound: Typically 8% liquidation incentive.
• MakerDAO: 13% liquidation penalty, though actual outcomes depend on the auction process.

These penalties stack on top of the loss from the price decline that triggered the liquidation in the first place.

Example of Total Liquidation Cost

Let's walk through a concrete example:

1. You deposit 10 ETH at $2,000/ETH ($20,000 collateral).
2. You borrow $12,000 USDC (60% LTV).
3. ETH drops to $1,500/ETH. Your collateral is now worth $15,000.
4. Your LTV is now 80% ($12,000 / $15,000), which exceeds the liquidation threshold.
5. A liquidator repays $6,000 of your debt (50% close factor).
6. With a 5% liquidation bonus, the liquidator receives $6,300 worth of ETH (4.2 ETH at $1,500).
7. You now have 5.8 ETH as collateral and still owe $6,000 USDC.

Your losses:

• You started with 10 ETH.
• After liquidation, you have 5.8 ETH and $12,000 USDC (the full borrowed amount).
• Net value: 5.8 ETH x $1,500 + $12,000 - $6,000 remaining debt = $14,700
• If you had simply held 10 ETH, you'd have $15,000.
• The liquidation penalty cost you $300 beyond the underlying market loss.
• If ETH recovers, you've permanently lost 4.2 ETH that could have recovered in value.

Strategies to Avoid Liquidation

1. Use a Conservative LTV

The simplest and most effective strategy is to borrow far below the maximum LTV. If the maximum LTV is 80% and liquidation threshold is 82.5%, borrowing at 80% gives you almost no margin.

Recommended approach:

• Conservative: 30-40% LTV (significant buffer)
• Moderate: 40-50% LTV (reasonable buffer for normal volatility)
• Aggressive: 50-60% LTV (limited buffer, requires active monitoring)
• Dangerous: 60%+ LTV (very close to liquidation in many protocols)

Warning: These are general guidelines, not rules. The appropriate LTV depends on the volatility of your collateral, market conditions, and your ability to monitor and respond to price changes. During extreme market events, even a 40% LTV position using volatile collateral can approach liquidation.

2. Monitor Your Position Actively

Don't borrow and forget. Set up monitoring for your positions:

• Protocol dashboards: Both Aave and Compound show your health factor and LTV in real time on their web interfaces.
• DeBank: Aggregates your DeFi positions across protocols and chains, showing health factors.
• Zapper: Similar portfolio tracking and monitoring.
• On-chain alerts: Services like Tenderly or custom alerts via protocol APIs can notify you when your health factor drops below a threshold.
• Price alerts: Set alerts on your collateral asset's price at levels where you'd need to take action.

3. Keep Reserve Capital Available

Maintain liquid reserves (stablecoins or fiat) that you can quickly deploy to:

• Add collateral to your position, reducing your LTV and improving your health factor.
• Repay part of your loan, reducing the numerator in your LTV calculation.

Having reserves available only helps if you can act quickly enough. During a market crash, network congestion may delay your transactions.

4. Use Stablecoin Collateral

Borrowing against stablecoin collateral (e.g., depositing USDC to borrow DAI) nearly eliminates liquidation risk from price volatility — though it introduces other risks, including depeg risk and generally lower yields.

5. Set Up Automated Protection

Some protocols and tools offer automated liquidation protection:

• DeFi Saver: A tool that can automatically add collateral or repay debt when your position approaches liquidation thresholds. It uses flash loans to rebalance your position in a single transaction.
• Instadapp: Offers similar automated vault management features.
• Self-managed: Advanced users can set up their own automated monitoring and response scripts.

Caution: Automated tools add an additional layer of smart contract risk. You're trusting not just the lending protocol's contracts, but also the automation tool's contracts.

6. Choose Less Volatile Collateral

Different collateral assets have different volatility profiles:

• Bitcoin and Ethereum are volatile but are the most liquid and widely supported collateral types.
• Stablecoins are the least volatile but typically offer lower borrowing capacity (since the spread between collateral value and loan value is smaller).
• Altcoins (smaller cap tokens) are the most volatile and typically have the lowest LTV limits and highest liquidation penalties — for good reason.

7. Avoid Borrowing in Bull Market Euphoria

The temptation to borrow against crypto is strongest when prices are high and rising. But this is also when the risk of a significant correction is elevated. If you borrow at market highs and the market corrects 30-50%, your position may be deeply underwater.

Be especially cautious borrowing against crypto that has recently experienced a large price increase. Mean reversion is a real phenomenon.

Case Study: March 2020 "Black Thursday"

On March 12, 2020, crypto markets experienced one of their most severe single-day crashes. ETH dropped from approximately $194 to $111 — a decline of over 40% in roughly 24 hours.

What happened in DeFi lending:

• MakerDAO experienced liquidations totaling approximately $8.3 million in a few hours.
• Ethereum network congestion caused gas prices to spike dramatically, preventing many users from adding collateral or repaying loans in time.
• Some MakerDAO liquidation auctions settled at near-zero prices because the congestion prevented bidders from participating, meaning some vault owners lost 100% of their collateral while the protocol also suffered a deficit.
• The event led MakerDAO to implement emergency measures and improve its liquidation auction mechanism.

Lessons from Black Thursday:

1. Extreme market events can overwhelm DeFi infrastructure.
2. Network congestion can prevent you from taking protective action.
3. Automated liquidation is only as effective as the network's ability to process transactions.
4. Even overcollateralized protocols can experience problems during extreme events.

Liquidation on Different Blockchains

If you're using DeFi lending on different blockchains, the liquidation mechanics are similar, but the practical experience differs:

Ethereum Mainnet

• Highest liquidity and most established protocols.
• Gas fees can spike dramatically during market stress, making it expensive (or slow) to add collateral or repay loans.
• Liquidation bots are highly competitive and efficient.

Layer 2 Networks (Arbitrum, Optimism, Base)

• Much lower transaction fees, making it cheaper to manage positions.
• Generally fast transaction finality.
• Liquidation infrastructure is less mature than mainnet, which can occasionally lead to delays.

Other Blockchains (Polygon, Avalanche, Solana)

• Low fees and fast transactions.
• Protocol versions may differ from Ethereum mainnet versions.
• Liquidity depth varies — less liquidity can mean worse liquidation outcomes.

The Bottom Line

Liquidation is the price you pay for mismanaging risk in crypto lending. It's designed to protect the protocol and its lenders — not you, the borrower.

Key takeaways:

• Borrow conservatively. Use an LTV well below the maximum. A 40-50% LTV gives you meaningful buffer against typical market moves.
• Monitor actively. Know your health factor at all times. Set up alerts.
• Keep reserves ready. Have capital available to add collateral or repay debt quickly.
• Plan for the worst. Design your position to survive a 40-50% price drop in your collateral without liquidation.
• Understand the costs. Liquidation penalties of 5-13% compound on top of market losses.

Crypto lending can be a powerful tool for accessing liquidity without selling your assets. But if you don't understand and actively manage liquidation risk, it can quickly become a very expensive lesson.

Disclaimer: This article is for educational purposes only and does not constitute financial, investment, or legal advice. Crypto lending involves significant risk, including the potential loss of your entire investment. Liquidation thresholds, penalties, and protocol parameters change over time — always verify current parameters on the protocol's official documentation. CryptoLendingHub.com may receive compensation from platforms mentioned on this site.

*Bill Rice is a fintech consultant with over 15 years of experience in the lending industry. He writes about crypto lending to help readers make informed decisions in a rapidly evolving market.*