Aave (AAVE) Lending Explained for Australians: Earning, Borrowing and Risks
Aave is one of the pillars of decentralised finance (DeFi): a protocol that lets people lend out their crypto to earn interest, or borrow against crypto they already hold, all without a bank in the middle. Its governance token, AAVE, is among the most established assets in DeFi. For Australian investors curious about earning yield or borrowing on-chain, Aave is a natural starting point — but it comes with risks and a genuinely complicated tax picture.
This guide explains how Aave works, what the AAVE token does, how Australians can access it, the key risks including liquidation, and how the Australian Taxation Office (ATO) treats lending, borrowing and rewards.
What is Aave?
Aave is a decentralised, non-custodial lending protocol — a set of smart contracts where users supply and borrow crypto. Interest rates adjust automatically based on supply and demand for each asset. There is no loan officer and no credit check; everything is governed by code and collateral.
Two features made Aave famous: variable and stable interest rate options, and “flash loans” (covered below). Aave sits at the heart of on-chain credit, alongside trading venues like Uniswap, stablecoin swap venues like Curve Finance, and the broader world of on-chain yield farming. If DeFi is new to you, start with our overview of DeFi in 2026.
How lending and borrowing work on Aave
Earning by supplying: aTokens
When you supply an asset to Aave — say a stablecoin like USDC — you receive an interest-bearing “aToken” (for example, aUSDC) in return. The aToken is a receipt representing your deposit plus the interest it earns. Rather than separate interest transactions, your aToken balance grows block by block: supply 10,000 USDC and your aUSDC balance climbs past 10,000 as borrowers pay interest. You can redeem aTokens for the underlying at any time, subject to available liquidity. The yield comes from real borrowers paying real interest, not an inflationary token subsidy.
Variable versus stable interest rates
Aave has historically offered borrowers a choice between a variable rate, which floats with market conditions, and a stable rate, fixed at the time of borrowing but able to be rebalanced by the protocol in extreme conditions. Variable rates are usually cheaper when markets are calm but can spike when an asset is in heavy demand. In practice most borrowing today is variable, and the stable-rate feature has been wound back on newer deployments, so do not assume a “fixed” borrow rate is genuinely locked for the life of your loan.
Utilisation drives the rate
Interest rates on Aave are a function of utilisation — the share of a pool’s supplied assets currently borrowed. When utilisation is low, rates are cheap to encourage borrowing. As it climbs toward an “optimal” point (often around 80–90%), rates rise steadily; beyond that they climb steeply to protect withdrawal liquidity. This is why a stablecoin supply APY can jump from 3% to 12% in a day when demand surges, and why an advertised yield is never a promise.
Borrowing against collateral
To borrow, you first deposit collateral, then borrow a smaller amount against it — DeFi loans are over-collateralised. If your collateral falls too far relative to your loan, the protocol will liquidate part of it to protect lenders. This is the single most important mechanic to understand, and our explainer on liquidation mechanics using Aave, Morpho and Compound walks through how it plays out.
Health factor, loan-to-value and liquidation, with the maths
Every Aave asset has a loan-to-value (LTV) ratio and a slightly higher liquidation threshold. LTV is the maximum you can initially borrow against a collateral asset; the liquidation threshold is the point at which your position becomes eligible for liquidation. ETH might have an LTV of 80% and a liquidation threshold of 82.5%.
Aave tracks the safety of your position with a single number called the health factor:
Health factor = (collateral value in AUD × liquidation threshold) ÷ total borrowed value in AUD
If the health factor is above 1, you are safe. If it falls to 1 or below, part of your position can be liquidated. The further above 1 you keep it, the more of a price drop you can absorb before trouble.
A worked liquidation example in AUD
Suppose an Australian investor deposits $20,000 AUD of ETH as collateral (bought earlier for $16,000, so a $4,000 unrealised gain sits inside it) and borrows $12,000 AUD of USDC against it. With a liquidation threshold of 82.5%:
Health factor = ($20,000 × 0.825) ÷ $12,000 = $16,500 ÷ $12,000 = 1.375. Comfortable.
Now ETH falls 30%. The collateral is worth $14,000. Recalculating: ($14,000 × 0.825) ÷ $12,000 = $11,550 ÷ $12,000 = 0.96. Below 1 — the position is now eligible for liquidation.
A liquidator repays part of the debt and seizes the corresponding collateral plus a liquidation penalty (commonly around 5–8%). Say the liquidator clears $6,000 of debt: they take $6,000 of ETH plus, at a 7% penalty, an extra $420 — roughly $6,420 of ETH removed to settle $6,000 of debt. The investor keeps the rest and no longer owes that $6,000, but has paid the penalty and forfeited ETH at a low price.
The Australian tax sting on a liquidation
Here is what many Australians miss: the forced sale of your collateral is a CGT disposal. The seized ETH was bought at one price and disposed of at the forced-sale price, so you crystallise a capital gain or loss — whether you wanted to sell or not. If the $6,420 of ETH seized had a cost base of, say, $5,140, you would have a capital gain of roughly $1,280 on the seized portion, reportable in AUD in the year of the liquidation. The CGT 12-month discount may apply if you had held that ETH for over a year. Being liquidated is painful enough without an unexpected tax bill on top, which is why records matter.
A supply-yield example in AUD
On the earning side, suppose you supply $10,000 AUD of USDC at a variable supply APY of 5%. Over a year, ignoring rate changes, you would earn roughly $500 AUD, reflected as a growing aUSDC balance. For Australian tax, that interest is generally ordinary income, assessable at its AUD value when it accrues, not merely when you cash out. Because Aave accrues interest continuously, you effectively receive many tiny income events across the year, each needing an AUD value recorded. Our broader look at earning yield on crypto in 2026 puts these returns in context.
Flash loans
Flash loans are Aave’s most distinctive feature: uncollateralised loans borrowed and repaid within a single blockchain transaction. If the loan is not repaid (plus a small fee) by the end of that transaction, the whole thing reverts as if it never happened, so lenders are never at risk. They power legitimate uses such as collateral swaps, refinancing and arbitrage, but have also been used to amplify exploits elsewhere in DeFi. For everyday users they are largely a developer tool.
What does the AAVE token do?
AAVE is the protocol’s governance token. Holders can vote on changes, and AAVE can be staked in the Safety Module — a backstop that helps cover shortfalls in exchange for staking rewards. Critically, staked AAVE can be partially slashed (up to a set percentage) if the protocol suffers a shortfall event. So staking AAVE is not risk-free yield; you are effectively underwriting the protocol and accepting that some of your stake could be seized to cover a bad-debt event.
GHO, Aave’s native stablecoin
Aave has also launched GHO, its own decentralised, over-collateralised stablecoin soft-pegged to the US dollar. Users mint GHO by borrowing it against collateral supplied to Aave, and the interest paid flows to the Aave treasury rather than to individual suppliers. GHO gives the protocol a native dollar unit and extra revenue, but as a young stablecoin it carries the usual peg and smart-contract risks — see our comparison of USDT, USDC and AUDC stablecoins for how the major options stack up.
Aave across multiple chains and Layer 2s
Aave is not confined to Ethereum’s mainnet. It runs across numerous Layer 2 rollups — such as Arbitrum, Optimism, Base and Polygon — where gas fees are dramatically lower. For smaller Australian positions this matters: a supply-and-withdraw round trip that costs tens of dollars on mainnet can cost cents on an L2. Each deployment is a separate pool with its own liquidity and rates, so the same asset can pay different yields on different chains.
Aave is often compared with newer lending designs. Our comparisons of Morpho versus Aave and Aave versus other lending protocols show where Aave’s model is strong and where challengers are innovating.
Supplying vs borrowing vs staking AAVE: a comparison
| Activity | What you do | Typical return | Main risk | General AU tax treatment |
|---|---|---|---|---|
| Supplying | Deposit an asset (e.g. USDC) to earn interest via aTokens | Variable supply APY paid by borrowers | Smart-contract failure; falling yield | Interest generally ordinary income in AUD |
| Borrowing | Deposit collateral, borrow a smaller amount against it | None — you pay interest for liquidity | Liquidation if collateral falls | Loan not a disposal; liquidation is a CGT event |
| Staking AAVE | Lock AAVE as a Safety Module backstop for rewards | Staking rewards in tokens | Slashing in a shortfall event | Rewards income when received; CGT on disposal |
For comparison, here is how supplying to Aave stacks up against a centralised exchange “earn” product:
| Factor | Exchange “earn” product | Supplying on Aave |
|---|---|---|
| Custody | Exchange holds your crypto | Non-custodial; you keep the keys |
| Yield source | Often opaque; platform-set | Transparent, on-chain, utilisation-driven |
| Main risk | Platform insolvency or freeze | Smart-contract exploit; liquidation |
| Tax complexity | Lower; fewer records | Higher; many accrual/disposal events |
How Australians can access Aave and buy AAVE
These are two distinct activities: buying the AAVE token, and using the protocol.
Buying the AAVE token
- AAVE is listed on AUSTRAC-registered Australian exchanges such as CoinSpot and Swyftx — see our Swyftx review, our CoinSpot review, and the wider Australian exchanges guide.
- Verify your identity, deposit AUD, and buy AAVE like any token.
Using the Aave protocol
- You will need a self-custody wallet and some of the network’s gas token (ETH on mainnet, or the L2’s gas token). Our wallets guide covers safe setup.
- Connect to Aave, supply an asset to earn, or deposit collateral to borrow — always keeping a healthy buffer above the liquidation threshold.
For most Australians who simply want a modest yield on stablecoins or blue-chip crypto, the extra return from DeFi often does not justify the added smart-contract and liquidation risk versus a straightforward exchange earn product. DeFi lending makes more sense once you understand the mechanics, can monitor positions, and are comfortable with a self-custody wallet. If you proceed, start small, keep your loan-to-value conservative, and never treat an advertised APY as guaranteed.
Common mistakes to avoid
- Borrowing too close to the liquidation threshold. A health factor just above 1 leaves no room for a normal market wobble. Keep a large buffer so a 20–30% drop does not wipe you out.
- Treating APY as guaranteed. Supply rates move constantly with utilisation; a headline yield can halve within days.
- Ignoring gas costs on small positions. On Ethereum mainnet, fees to supply, borrow, repay and withdraw can quietly erase the interest on a small position. A low-fee Layer 2 is often the only way small AUD amounts make sense.
- Not tracking every interest accrual for tax. Continuous aToken growth means many tiny income events, each needing an AUD value. Reconstructing this at tax time without software is painful; track as you go.
- Assuming staking AAVE is risk-free. The Safety Module pays rewards precisely because stakers accept slashing risk. It is a backstop, not a savings account.
Key risks Australians should weigh
- Smart-contract risk. Even audited protocols can be exploited.
- Stablecoin and oracle risk. A de-pegged stablecoin or faulty price feed can cascade into forced liquidations.
- Regulatory uncertainty. ASIC is still shaping how DeFi lending is treated in Australia, and AUSTRAC oversight of the on- and off-ramps continues to evolve.
Aave and Australian tax: a genuinely complex area
DeFi lending is one of the messiest areas of Australian crypto tax. Broadly:
- Supplying assets: receiving an aToken in exchange for your deposit may itself be a CGT event, and interest earned is generally treated as ordinary income at its AUD value when received.
- Borrowing: taking out a loan is generally not a disposal, but if you swap or spend the borrowed funds, or get liquidated, CGT events can arise. A liquidation is a disposal of the seized collateral.
- Staking AAVE: rewards are generally assessable income when received, and later subject to CGT on disposal.
The ATO expects you to track every event in AUD. Our DeFi tax guide for Australia and the comprehensive 2026 crypto tax guide cover this in detail. Given the number of events, purpose-built crypto tax software is close to essential.
Frequently asked questions
Is Aave safe to use from Australia?
Aave is one of the more battle-tested DeFi protocols, but “safer” is not “safe”. You still face smart-contract, liquidation and market risk, and it is unregulated in Australia. Never supply or borrow more than you can afford to lose.
Can I earn interest on stablecoins with Aave?
Yes. Supplying stablecoins such as USDC earns a variable interest rate paid by borrowers, reflected as a growing aToken balance. The yield fluctuates with utilisation and is generally treated as taxable income by the ATO at its AUD value when received.
What happens if I get liquidated on Aave?
If your health factor falls to 1 or below, a liquidator repays part of your debt and seizes the matching collateral plus a penalty (often 5–8%). In Australia, that forced sale is generally a CGT disposal of the liquidated collateral, so a gain or loss is crystallised even though you did not choose to sell.
What is the health factor on Aave?
The health factor is a single number measuring how safe your borrowing position is: collateral value multiplied by the liquidation threshold, divided by your borrowed value. Above 1 is safe; at 1 or below you can be liquidated. Keeping it well above 1 gives room to survive a sharp price drop.
Do I pay tax just for supplying assets to Aave?
Possibly. Receiving an aToken for your deposit may be treated as a CGT event, and the interest that accrues is generally ordinary income in AUD as you earn it. This is complex and situation-specific, so keep full records and consider a registered tax agent.
General information only. This article is general information and education, not financial or tax advice. Cryptocurrency is highly volatile and you can lose money. Crypto Australia Guide does not hold an Australian Financial Services Licence (AFSL). Always do your own research and consider speaking to a licensed financial adviser or registered tax agent about your personal circumstances before investing. Tax treatment depends on your individual situation and current ATO guidance.
