Many liquidations on Aave don’t come from wild bets. They often come from borrowing a bit too much, looking away for a weekend, and letting the market move. If you hold ETH or BTC and want cash without selling, Aave can do that. It can also take your collateral at a discount if you’re careless, so the goal here is to borrow in a way that survives a bad week.
The short version: borrow far less than the maximum, watch your health factor, know what you’re paying in interest, and understand the risks that sit outside your control.
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- Aave lets you supply crypto as collateral and borrow against it. Your position is liquidated if its health factor drops below 1.
- The maximum borrow limit is not a target. Treat it as the edge of a cliff and stay well back from it.
- Interest accrues continuously, so a position can get riskier even when prices sit still.
- Smart-contract, oracle and liquidation-design risks exist even if you do everything right.
- Start small, write down your rules before you borrow, and test them against a price drop.
Table of Contents
- How borrowing on Aave actually works
- The health factor: the one number to watch
- What happens if you get liquidated
- What borrowing costs
- Risks beyond your own loan size
- A step-by-step routine for borrowing more safely
- Common mistakes
- Where we fit in
- FAQ
- Sources
How borrowing on Aave actually works
Think of it like a home equity line, except there’s no bank, no credit check and no phone call before something goes wrong. You deposit assets, which become collateral. You then borrow other assets against them. According to Aave’s own documentation, positions are over-collateralized, debt accrues interest over time, and a position becomes eligible for liquidation if its health factor falls below 1.
Over-collateralized just means you lock up more value than you borrow. That cushion is what protects the lenders on the other side. It’s not designed to protect you from a sharp drop, though. That part is your job.
What you can use as collateral, and where
Aave V3 accepts crypto such as ETH and USDC as collateral, and it’s deployed on many networks, including Ethereum, Polygon, Avalanche, Base, Arbitrum and Optimism. Fees, available assets and liquidity differ by network, so check what’s offered on the one you pick before you move funds.
If you hold Bitcoin, one wrinkle matters. Aave can’t take native BTC directly in the classic setup. You’d need a wrapped version of BTC, which adds another layer of trust and another thing that can break. That’s not a reason to avoid it, but it belongs in your risk math. Our guide on choosing a collateral asset walks through the tradeoffs, and the one on borrowing against Ethereum without selling covers the ETH side.
Newer versions are changing how markets are organized. Aave V4 groups lending into markets under Hubs, including markets for borrowing stablecoins against specific collateral. Details will keep evolving, so read the current interface before you act.
The health factor: the one number to watch
Your health factor is a safety score. Aave defines it as total collateral value times the weighted average liquidation threshold, divided by total borrow value. Below 1, your position can be liquidated.
Here’s a worked example. Say you supply $10,000 of ETH and the liquidation threshold is 80%. You borrow $6,000 in a stablecoin.
- Health factor = ($10,000 × 0.80) / $6,000 = 1.33
That looks fine. But run it backward. Your health factor hits 1 when collateral is worth $7,500, because $7,500 × 0.80 = $6,000. That’s a 25% drop in ETH. ETH has done that in a few weeks more than once. So 1.33 is not a comfortable number, it’s a nervous one.
Now compare a more careful version: same $10,000 of ETH, but you borrow $3,000.
- Health factor = ($10,000 × 0.80) / $3,000 = 2.67
- Liquidation arrives when collateral falls to $3,750, a 62.5% drop
Same collateral, very different night’s sleep. These examples assume a single collateral asset, stablecoin debt and no accrued interest. As interest builds, the liquidation point creeps closer. The thresholds here are the example’s, not a promise for any particular asset. Each asset has its own setting, so check the live numbers in the app.
A rule of thumb for staying safe
No single number is right for everyone. A simple way to think about it is to pick the price drop you want to survive, then work backward to the borrow amount. If you want to survive a 50% drop in your collateral, you need a starting health factor of about 2. That assumes one collateral asset, stablecoin debt and unchanged risk settings. Leave extra room for accruing interest, parameter changes and slow price feeds. Most people who run this exercise are surprised by how small the loan gets. That’s the point of it.
Our piece on stress-testing your LTV gives you a method for doing this on your own holdings.
What happens if you get liquidated
When the health factor falls below 1, third-party liquidators can repay part of your debt and receive your collateral at a discount. You don’t get a warning call. Bots do this automatically, and they are fast.
The discount is the cost. An academic study of DeFi liquidations by Qin and coauthors (2021) found that existing liquidation designs reward liquidators but can sell more discounted collateral than necessary, at the borrower’s expense. In plain terms, a liquidation can cost you more than the shortfall it fixes.
For a deeper walkthrough, see our guide on how crypto loan liquidation works and how to avoid it.
There’s also a tax angle. A liquidation is a forced sale, and in the US that can create a taxable event. We cover the basics in our note on US crypto capital gains, and you should talk to a CPA who knows crypto before you rely on any borrowing strategy for tax reasons.
What borrowing costs
Borrowing on Aave isn’t free, whatever the thumbnails say. Rates move with utilization, meaning how much of a pool is already borrowed. Per Aave’s docs, rates rise faster above the optimal utilization point, and you can repay at any time. So a cheap loan this month can get pricey when demand spikes.
Two habits help here:
- Convert the rate into daily and monthly terms. An annual percentage is easy to ignore. A dollar figure per month is not. If you want to translate APY figures into interest rates, an APY to interest rate calculator does the conversion in seconds.
- Remember interest lowers your health factor. Debt grows continuously, and Babylon’s documentation for its Aave V4 Bitcoin-vault integration notes that interest can drag the health factor down over time even when the price of your collateral stays flat.
If you borrow more than one asset, each debt is tracked separately in its own asset. Babylon’s docs for the same integration describe repaying partially or in full.
Risks beyond your own loan size
Keeping a healthy ratio handles the risk you control. A few risks you don’t control are worth knowing about.
Smart-contract risk
Aave says it’s not risk-free. It points to public code, multiple external audits, community review of changes and a bug bounty program as its main protections. Those are real safeguards. They aren’t guarantees, and in fast markets the interaction between liquidations, price swings and other protocols that plug into Aave adds uncertainty that is hard to model.
Oracle risk
Aave relies on price feeds to decide who gets liquidated. If a feed is slow or wrong, people get hurt. In an analysis of a roughly $1.6 million bad-debt event, EigenPhi found that on-chain oracle quotes lagged Binance prices by about 10 minutes. Ten minutes is forever in a fast market. We go deeper on this in our guide to oracle risk in DeFi.
Risk controls built into the protocol
Aave V3 added features aimed at limiting damage. Isolation mode restricts isolated collateral to one asset and limits borrowing to isolated stablecoins, and there are optional supply and borrow caps. These shape what you can do, and sometimes they’ll stop you from doing something you wanted. That’s the system working.
Risk from what you do with the money
This is where most real losses happen. Borrowing is one risk. Taking the borrowed funds and putting them into a liquidity pool or farm adds a second one. If the pool drops, your debt doesn’t. You then owe the same amount against collateral that may also be falling. Looping, where you re-deposit borrowed funds to borrow again, stacks the risk even further. If you’re a parent with a mortgage and a college fund to think about, keep the cash-flow side boring.
Before you deploy borrowed funds anywhere, run the project through a rug pull warning-signs check. And size the income side separately from the borrowing side, using a method like our one on sizing BTC and ETH income positions.
A step-by-step routine for borrowing more safely
- Decide the purpose. Cash for a specific need, or funds to deploy? Write it down. Vague loans tend to grow.
- Pick the collateral and network. Fewer moving parts is better. Verify the official Aave app address from Aave’s own site, not from a search ad or a DM.
- Choose your survivable drop. Decide how far collateral can fall before you act, then size the loan from that.
- Start with a small test borrow. Do the full cycle: supply, borrow, check the numbers, repay. Mistakes are cheaper at $500 than at $50,000.
- Set alerts and a rule. For example: if the health factor drops under a number you chose in advance, you repay part of the loan or add collateral. Deciding in advance matters because panic is a bad analyst.
- Check weekly, and after big moves. Interest keeps running. So does the market.
- Keep reserves. Hold stablecoins or other assets outside the position so you can repay or top up fast.
- Keep records. Save transaction history for tax time. Our DeFi tax reporting guide explains how to build a ledger.
For the monitoring part specifically, a dashboard helps. See our guide to crypto portfolio tracking for DeFi borrowers, and crypto collateral management for what to do when the market turns against you.
Common mistakes
| Mistake | Why it hurts | Safer move |
|---|---|---|
| Borrowing the maximum | A small dip triggers liquidation | Borrow a fraction of the limit |
| Ignoring interest | Debt grows and health factor slides | Check the position weekly |
| Deploying borrowed funds into unvetted pools | Debt stays while the pool value can fall | Vet the project and size it small |
| Using a volatile asset as the borrowed asset | Debt can grow in dollar terms when that token rises | Consider stablecoin debt if you need a stable amount to repay |
| Following a tutorial blindly | Interfaces, rates and markets change | Read current docs, test small |
| Treating a video’s yield as guaranteed | Rates move, risks stay | Plan for worse than the advertised number |
Where we fit in
We built OverseasDeFi for people in exactly this spot: you own BTC or ETH, you don’t want to sell, and you’d like it to do something useful without risking the house. We teach the mechanics in plain English, including what can go wrong, and you keep control of your assets. We don’t hold your funds or manage investments for you, and we don’t promise returns.
OverseasDeFi offers two levels of support, Community and Accelerator. The member platform includes portfolio and position tools, such as health-factor checks and stress tests, plus an AI coach with context on your portfolio, alongside live human guidance. These help you understand and monitor a position. They can’t prevent liquidation or make decisions for you. Current details are on the Accelerator page.
If you’d rather start by reading, our free guides cover collateral, liquidation and daily income step by step. If you want to talk it through with people, Community is the low-pressure place to begin.
FAQ
Is it safe to borrow on Aave?
It can be reasonably safe if you borrow well under your limit and monitor the position, but it’s never risk-free. Aave itself says the protocol has risks, including smart-contract and oracle risk. Your biggest controllable risk is the loan size.
What health factor should I aim for?
There’s no official safe number, since it depends on how volatile your collateral is and how fast you can react. A health factor of 1 is the liquidation line, and the closer you sit, the less room you have for a drop. Work backward from the price decline you want to survive, as in the examples above.
Can I borrow against Bitcoin on Aave?
Not against native BTC in the classic setup. You’d generally use a wrapped BTC token, which adds its own trust and technical risk. Proposals for native Bitcoin collateral have been discussed, so check what’s live before you plan around one.
Do I owe tax when I borrow on Aave?
Borrowing itself is generally not treated as a sale in the US, but liquidation, repayment with sold assets, and yield earned from deployed funds can all have tax consequences. Treatment depends on your jurisdiction and the specific transactions. Read our note on US crypto rewards and taxes and ask a CPA who handles crypto.
What happens if I can’t repay?
There’s no collections call. If the health factor falls below 1, liquidators repay part of your debt and take your collateral at a discount. You can avoid this by repaying part of the loan or adding collateral before it gets there.
Sources
- Aave v3 overview
- Introduction to Aave V3
- Aave: The Future of DeFi
- Health Factor & Liquidations
- An Empirical Study of DeFi Liquidations (Qin et al., 2021)
- DeFi composability study (arXiv PDF)
- Borrow & repay docs
- Aave risks
- Aave V3 risk README
- EigenPhi analysis of Aave bad debt