Compound Borrowing: DeFi Loans

Why Choose Compound for DeFi Borrowing?

Compound V3 (Comet) lets you borrow a single base asset -- typically USDC -- against multiple collateral types (ETH, WBTC, wstETH, cbETH, COMP, UNI, LINK). Unlike Aave's multi-asset borrowing, each Comet market isolates risk to one borrowable asset, which simplifies your position management and reduces systemic contagion risk. In practice this means the USDC market and the ETH market each carry their own independent interest rate curve, utilisation ratio, and collateral factors -- a problem in one market cannot cascade into another.

The V3 architecture introduced account-level accounting rather than cToken accounting. When you deposit ETH as collateral, you do not receive cETH; the collateral is tracked internally inside the Comet contract. This removes one attack surface (cToken re-entrancy) and makes position tracking more transparent -- your borrow balance and collateral balance are readable as a single on-chain call. Interest accrues continuously, so your debt grows by the second rather than in per-block snapshots.

Current USDC borrow rates on Compound sit around 5-6% APY variable, competitive with Aave's 4-7% range. There are no origination fees, no fixed terms, and no minimum borrow amounts. You repay whenever you want -- partially or fully. The protocol has processed billions in borrows since 2018 with no major exploit affecting user funds.

Key Borrowing Parameters (USDC Comet)

• ETH collateral factor: 82% LTV, 85% liquidation threshold
• WBTC collateral factor: 70% LTV, 77% liquidation threshold
• wstETH collateral factor: 82% LTV, 85% liquidation threshold
• Liquidation penalty: 5-8% depending on asset
• Interest rate model: kinked curve with ~80% target utilisation
• Borrow APY at 50% utilisation: ~4%; at 80%: ~6%; at 95%: ~25%+

How Compound Borrowing Works

Step 1: Connect Your Wallet

Visit app.compound.finance and connect MetaMask, WalletConnect, or Coinbase Wallet. No registration, KYC, or identity documents needed — the protocol interacts with your wallet address only. Verify the URL carefully before connecting: phishing sites mimicking compound.finance have stolen funds from users who approved transactions on fake domains. For positions above £10,000, connect through a Ledger or Trezor hardware wallet via MetaMask to keep your signing keys offline.

Step 2: Supply Collateral

Deposit ETH, WBTC, wstETH, cbETH, COMP, UNI, or LINK into the Comet USDC market. An important V3 distinction: your collateral does not earn supply interest. On Aave, deposited ETH earns approximately 1-2% supply APY even while backing a borrow. On Compound V3, your collateral earns nothing — it exists solely to secure your loan. This means your effective borrowing cost on Compound is slightly higher than the displayed APY suggests when you factor in the foregone yield on your collateral. COMP token rewards partially offset this, but check the current COMP distribution rate before assuming it fully compensates.

Step 3: Borrow USDC

Select the USDC amount to borrow. The Compound interface displays your current collateral factor utilisation as a percentage bar. With £10,000 of ETH at the 82% collateral factor, your theoretical maximum is £8,200 USDC — but borrowing at maximum leaves a 3% gap to the 85% liquidation threshold, which a minor price dip can close within hours. Target 50% utilisation for multi-month positions: this gives your ETH a 35% crash buffer before liquidation, which historically survives even aggressive bear market sell-offs.

Worked Example

You deposit 5 ETH (worth $15,000 at $3,000/ETH). At 82% collateral factor, your maximum borrow is $12,300 USDC. You borrow $7,500 (50% LTV) at 5.5% APY. After one year, you owe ~$7,913 in principal plus interest. If ETH drops 30% to $2,100, your collateral is worth $10,500 and your LTV jumps to ~75% -- still below the 85% liquidation threshold, but you should add collateral or repay some debt. If ETH drops 45% to $1,650, your collateral is worth $8,250 and your LTV hits ~96% -- your position gets liquidated with a 5% penalty.

Comparison with Aave Borrowing

Aave V3 lets you borrow multiple assets simultaneously, offers stable rate options, and your collateral earns supply interest. Compound V3 is simpler: one borrowable asset per market, variable rates only, and collateral earns nothing. If you need to borrow DAI or ETH (not just USDC), or want your collateral earning yield, Aave is the better choice. If you value Compound's isolated risk model and straightforward interface, it serves well for USDC-denominated borrowing. For a detailed comparison, see our DeFi platforms comparison and our DeFi lending guide.

Advanced Borrowing Strategies on Compound

Leveraged Yield Farming

Borrow USDC against ETH collateral, deploy the USDC into a yield farm (e.g. Curve's 3pool at ~5% APY), and pocket the spread between farm yield and Compound's borrow rate. If you borrow at 5.5% and farm at 8%, your net yield on borrowed capital is ~2.5%. The risk: if ETH drops, your collateral shrinks towards liquidation while your farm position stays flat. Use DeFi Saver or Instadapp to set automated deleveraging triggers.

Tax-Efficient Liquidity

Instead of selling appreciated ETH (triggering capital gains), borrow USDC against it. You access liquidity without a taxable event, and your ETH continues to appreciate. Repay the loan later when you have income or when tax conditions are more favourable. This works in most jurisdictions, but consult a crypto-savvy tax adviser for your specific situation.

Risk Monitoring Tools

Use DeFi Saver's automated repayment (triggers at a health factor you set), or DeBank/Zapper for portfolio-level monitoring across Compound and other protocols. Set price alerts on ETH at your liquidation threshold minus 15% so you have time to add collateral or repay. For a deeper look at managing DeFi positions, see our crypto risk management guide.

Managing Positions During Market Volatility

The most dangerous period for Compound borrowers is a sharp, sudden price drop in collateral assets. During the May 2021 crash, ETH fell roughly 50% over two weeks, and during the November 2022 contagion following the FTX collapse, ETH dropped 25% in 48 hours. In both cases, borrowers with LTV above 70% faced liquidation within hours. The lesson is straightforward: your safety margin needs to survive not just gradual declines but single-day crashes of 20-30%.

A practical approach is to set up a tiered response plan before you borrow. At 60% LTV, take no action but monitor daily. At 65% LTV, prepare a repayment transaction in your wallet but do not submit it yet. At 70% LTV, either add collateral or repay enough debt to bring your ratio back to 55-60%. At 75% LTV, treat the situation as urgent and act immediately. DeFi Saver can automate these thresholds by executing a partial repayment when your position crosses a predefined ratio, using a flash loan to repay debt and withdraw the corresponding collateral in a single atomic transaction.

One underappreciated risk during volatility is gas price spikes. When ETH drops sharply, gas prices often surge simultaneously as thousands of DeFi users rush to adjust positions. During the March 2020 crash, gas prices exceeded 500 gwei, making a single Compound repayment transaction cost over £100. If your borrow position is small (under £5,000), the gas cost to save your position may not be worth it during extreme congestion. Factor this into your decision about position sizing: on Ethereum mainnet, positions below £5,000 are disproportionately expensive to manage in a crisis. On Base or Arbitrum, this threshold drops significantly because gas remains under £1 even during peak congestion periods.

For UK borrowers, keeping a reserve of stablecoins in your wallet specifically for emergency repayments is worth considering. If you have a £15,000 borrow position, holding £3,000 in USDC as a buffer lets you reduce your LTV quickly without needing to bridge funds from an exchange or sell other assets. This buffer reduces your capital efficiency, but it eliminates the risk of being unable to act during the critical hours when collateral prices are falling and the network is congested.

Compound vs Other DeFi Protocols

The detailed Aave comparison is in the How Compound Borrowing Works section above. In short:

• Compound V3 vs Aave V3: Compound is simpler (one borrowable asset per market, variable rates only, no collateral yield). Aave offers multi-asset borrowing, stable rates, and supply interest on collateral. If you need to borrow DAI or ETH, Aave is the only option.
• Compound vs MakerDAO (Sky): MakerDAO generates DAI through overcollateralised vaults. It is not a general-purpose lending protocol. Use MakerDAO if you specifically want to mint DAI; use Compound if you want to borrow USDC against varied collateral.
• Compound vs Morpho: Morpho sits on top of Compound and Aave, matching lenders and borrowers peer-to-peer for better rates while using the underlying protocol as fallback liquidity. If you want potentially lower borrow rates without managing your own positions, Morpho is worth evaluating.

Security and Risk Considerations

Smart Contract Risk

Compound has been audited by Trail of Bits, OpenZeppelin, and Certik, with no major exploit affecting user funds since 2018. However, DeFi smart contract risk is never zero. The protocol has pause functionality and timelock controls on governance changes (minimum 2-day delay) to limit damage from potential vulnerabilities or malicious proposals.

Liquidation Risk

If your collateral value drops below the liquidation threshold, third-party liquidators will repay part of your debt and seize your collateral at a 5-8% discount. This happens automatically and immediately -- you receive no warning beyond your on-chain health factor declining. In the March 2020 crash, ETH dropped 45% in hours; many borrowers were liquidated before they could react. Maintain at least a 20% buffer between your current LTV and the liquidation threshold.

Governance Risk

COMP token holders can modify collateral factors, interest rate models, and asset listings. A malicious governance proposal could theoretically harm borrowers. The 2-day timelock gives the community time to respond, but sophisticated attacks (accumulating COMP quietly, then pushing a harmful proposal) remain a theoretical risk in any token-governed protocol.

Understanding Compound Market Dynamics

Interest Rate Curve

Compound uses a kinked interest rate model. Below ~80% utilisation, borrow rates rise gradually (roughly 4-6% APY for USDC). Above 80%, rates jump steeply to incentivise repayment and new supply -- at 95% utilisation, expect 25%+ APY. This means your borrow cost can spike overnight if large suppliers withdraw. Monitor utilisation on the Compound dashboard or via DeFi Saver alerts before borrowing significant amounts.

Health Factor and Liquidation Mechanics

Compound V3 uses an account health model rather than Aave's explicit health factor number, but the underlying maths is the same. Your position is safe when:

(sum of collateral value × liquidation threshold) > outstanding borrow balance

For example, if you have deposited 4 ETH worth £12,000 and ETH's liquidation threshold is 85%, your liquidation buffer is £10,200. If your USDC borrow is £8,500, you have £1,700 of headroom -- ETH must fall roughly 14% from current price before you hit the liquidation line. You can monitor this directly on the Compound app: the interface shows your borrow capacity used as a percentage and highlights when you are approaching the threshold.

Liquidation is permissionless: any address running a liquidation bot can repay your debt and claim your collateral at a 5-8% discount. In V3, the close factor is 100% -- a liquidator can repay your entire debt in one transaction, taking all your collateral minus the liquidation penalty. This is more aggressive than Aave's 50% close factor. Practical implication: if you hit the liquidation threshold, you lose everything, not half.

COMP Token

COMP grants governance voting rights (propose changes, modify parameters, add assets). Both suppliers and borrowers earn COMP proportional to interest accrued, though emission rates have decreased significantly since launch. Current COMP rewards add roughly 0.1-0.5% APY on top of market rates -- meaningful but no longer the primary reason to use the protocol. Holders can delegate votes to active governance participants without transferring tokens.

Getting Started with Compound

Step-by-step borrowing instructions are covered in How Compound Borrowing Works above. Before you begin, ensure you have:

• An Ethereum wallet (MetaMask recommended) with ETH for gas fees (~$5-20 per transaction on mainnet)
• Collateral assets (ETH, WBTC, wstETH, or other supported tokens) already in your wallet
• A clear plan for your target LTV -- 50-60% is conservative, 70% is moderate, above 75% is risky
• DeFi Saver or a similar tool configured for automated deleveraging if your health factor drops

Gas Cost Considerations: Mainnet vs Base

Supplying collateral and borrowing are two separate transactions on Ethereum mainnet. At 15 gwei gas price with ETH at £2,500, each transaction costs roughly £3-8, making a full open-and-manage cycle (supply collateral, borrow, later add collateral, repay) around £20-50 total on mainnet. For a £20,000 borrow held for six months, that is a 0.25% overhead -- acceptable. For a £3,000 borrow, the same gas bill represents 1.5-2% of principal before you earn a penny.

On Base, the same set of transactions costs under £0.50 in total. The Compound V3 USDC market on Base has over £100m in liquidity and tracks mainnet rates within 0.5% in normal conditions. The practical decision rule: if your total borrow is below £8,000, Base is more cost-effective; above £15,000, mainnet liquidity depth and slightly lower rate volatility justify the higher gas. Between those figures, check current Base utilisation before deciding -- if Base utilisation exceeds 85%, rates can temporarily spike above mainnet.

Wallet Security Before Borrowing

Before depositing collateral into Compound, ensure your wallet security is solid. Use a hardware wallet (Ledger or Trezor) for signing transactions rather than relying solely on a browser extension. Verify you are on the correct URL (app.compound.finance) every time -- phishing sites impersonating DeFi protocols are common. Review the smart contract interaction details in your wallet before confirming any transaction, and revoke unnecessary token approvals using tools like Revoke.cash after completing your borrowing setup.

UK Tax: Borrowing Is Not a Disposal

For UK residents, depositing collateral into Compound and borrowing USDC against it is generally not treated as a taxable disposal by HMRC. You have not sold your ETH; you have pledged it. Your cost basis remains intact, and no Capital Gains Tax event arises at the point of deposit or borrow. This is the key tax advantage of DeFi borrowing over selling: you access liquidity without crystallising a gain.

Liquidation is a different matter. When a liquidation bot seizes your ETH collateral, HMRC treats that as a disposal at the market value at the time of liquidation. You must calculate the gain (disposal proceeds minus acquisition cost) and report it on your Self Assessment return. If you originally acquired that ETH at £800 and it was liquidated at £2,200, you have a £1,400 gain per ETH to declare -- even though the liquidation was involuntary and you may have lost money overall on the borrow position.

Worked example. You bought 3 ETH at £1,000 each (total cost basis: £3,000) in 2022. In 2026, ETH is worth £3,200 each; you deposit all 3 ETH as Compound collateral and borrow £5,500 USDC. No taxable event. Over six months you pay £165 in interest (6% APY). Interest is not deductible for individual investors under current HMRC guidance. You repay the £5,665 (principal plus interest) and withdraw your ETH. Still no disposal -- your ETH cost basis remains £3,000. If instead ETH drops to £2,000 and your position is liquidated, HMRC treats it as a disposal of 3 ETH at £2,000 each (£6,000 total proceeds). Your gain is £6,000 minus £3,000 cost basis = £3,000 taxable gain, subject to Capital Gains Tax at 18% or 24% depending on your total income that year.

COMP token rewards earned while borrowing are treated as miscellaneous income under HMRC's cryptoasset manual and taxed at your marginal Income Tax rate in the year you receive them. Keep detailed records of all Compound interactions: deposit dates, borrow amounts, interest accrued, repayment dates, and any liquidation events. Koinly and CoinTracker both support Compound V3 and can generate HMRC-compatible CGT reports and income summaries for your Self Assessment return.

Compound Governance

Compound is governed by COMP token holders. Any address holding at least 25,000 COMP (or delegated votes) can create a proposal. Proposals require a quorum of 400,000 COMP votes to pass and carry a 2-day timelock before execution. Governance can modify collateral factors, interest rate models, asset listings, and COMP distribution rates. COMP is earned by both borrowers and suppliers proportional to interest accrued, claimable anytime from the app interface. For most borrowers, governance is a background process -- but monitor proposals on Tally or the Compound forum, as changes to your collateral asset's parameters directly affect your liquidation risk.

How Governance Affects Borrowers

Governance proposals that reduce collateral factors can push your existing position closer to liquidation without any price movement in the underlying asset. For example, if ETH's collateral factor is reduced from 82% to 75%, your previously safe 65% LTV position suddenly has much less buffer before liquidation. Subscribe to the Compound governance forum and set up notifications on Tally to receive alerts about any proposals that modify parameters for assets you are using as collateral. You typically have at least 4-5 days between a proposal being submitted and it being executed (voting period plus timelock), which gives you time to adjust your position.

Delegate Your Votes

If you earn COMP tokens through borrowing or supplying, you can delegate your voting power to active governance participants without transferring the tokens themselves. This ensures your COMP contributes to protocol governance even if you do not personally follow every proposal. Several respected DeFi governance delegates actively participate in Compound governance and publish their voting rationale publicly.

Governance Participation: Practical Steps

To delegate your COMP, visit the Compound governance interface at comp.xyz or use Tally (withtally.com). Connect your wallet, select a delegate from the list (or enter a custom address), and confirm the on-chain delegation transaction — this costs a standard gas fee but only needs to be done once. Popular delegates include university blockchain clubs (Stanford, Penn), protocol-focused teams (Gauntlet, OpenZeppelin), and individual governance researchers who publish their voting rationale. Delegation does not transfer your COMP tokens — it only assigns voting power — and you can revoke or redirect delegation at any time. If you hold more than 100 COMP (roughly £5,000-8,000 at current prices), your votes carry meaningful weight on close proposals. Even smaller holders should delegate rather than let voting power sit idle, because quorum requirements mean every delegated vote helps ensure governance proposals can proceed without delays.

COMP Reward Tax Treatment for UK Residents

COMP tokens received as borrowing or supply incentives are treated as miscellaneous income by HMRC, valued in GBP at the spot price on the date you claim them. Each claim creates a separate income tax event, so batch your claims to reduce both gas costs and the number of individual entries in your tax records. When you later sell or swap COMP, the disposal triggers Capital Gains Tax on any appreciation above the income value recorded at receipt. Koinly and CoinTracker both support Compound V3 reward tracking, though you may need to manually label COMP claims as income rather than relying on automatic categorisation.

Supported Assets

Compound V3 (Comet) focuses on isolated markets. The primary market lets you borrow USDC against these collateral types:

• ETH: 82% collateral factor, 85% liquidation threshold, 5% liquidation penalty
• WBTC: 70% CF, 77% LT, 8% penalty
• wstETH: 82% CF, 85% LT, 5% penalty
• cbETH: 80% CF, 85% LT, 5% penalty
• COMP: 65% CF, 70% LT, 8% penalty
• UNI: 68% CF, 75% LT, 8% penalty
• LINK: 68% CF, 75% LT, 8% penalty

USDC borrow rates typically range from 4-8% APY depending on utilisation. The ETH borrow market on mainnet (where you supply USDC to borrow ETH) has historically run at 2-4% APY -- lower than USDC rates because ETH demand from borrowers is structurally weaker than stablecoin demand. The WETH market on Base has run slightly higher, around 3-5%, reflecting the smaller liquidity pool. These figures shift with market conditions: during high-leverage periods (bull market peaks), ETH borrow rates have spiked above 8% as traders borrowed ETH to short or to meet redemptions. Additional Comet markets exist for borrowing ETH and WETH on mainnet, plus deployments on Base, Polygon, and Arbitrum with lower gas costs. Check app.compound.finance for current rates and available markets on each chain.

Multi-Chain Deployment

Compound V3 is deployed on Ethereum mainnet, Base, Polygon, and Arbitrum. For UK users who want to minimise transaction costs, Base and Arbitrum offer the same borrowing functionality with gas fees under £0.50 per transaction instead of £10-40 on mainnet. The trade-off is slightly lower liquidity on L2 deployments, which can mean marginally higher borrow rates during peak demand. If your borrowing position is under £10,000, an L2 deployment is almost certainly more cost-effective than mainnet after accounting for the gas savings across multiple collateral adjustments and repayment transactions over the life of your loan.

Compound Protocol Features

Key Protocol Features

• Algorithmic rates: Interest rates adjust automatically based on utilisation. No human intervention, no manual rate-setting committees. You can check the exact rate curve for any market in the Compound documentation.
• COMP rewards: Borrowers and suppliers earn COMP tokens proportional to interest accrued. Current emissions add roughly 0.1-0.5% APY on top of market rates. COMP is tradeable on major exchanges.
• Full transparency: All positions, rates, and governance proposals are on-chain and publicly verifiable. Third-party dashboards (DeFi Saver, DeBank, Zapper) integrate directly.
• Composability: Compound positions integrate with Yearn vaults (automated yield optimisation), DeFi Saver (automated position management), and Instadapp (one-click leveraging/deleveraging). Institutional users access the protocol through Fireblocks, BitGo, and Anchorage custody integrations.

Security Track Record

Audited by Trail of Bits, OpenZeppelin, and Certik. No major exploit affecting user funds since the 2018 launch. The protocol uses timelocked governance (2-day minimum delay), emergency pause functionality, and conservative collateral factor settings. All smart contract code is open-source and formally verified for critical functions. Compound's conservative upgrade cadence prioritises security over rapid feature development -- a trade-off that suits borrowers who value predictability.

Final Thoughts

Compound borrowing suits users who want simple, isolated-risk USDC loans against blue-chip collateral. The V3 architecture trades flexibility (fewer assets, no stable rates, no collateral yield) for cleaner risk isolation. If you need multi-asset borrowing or your collateral earning supply interest, Aave V3 is the stronger option. If you value Compound's conservative approach and straightforward single-asset model, it remains a battle-tested choice with over six years of operation and no major exploits.

Start with a conservative LTV (50-60%), use DeFi Saver or similar tools for automated liquidation protection, and monitor utilisation rates to anticipate borrow rate spikes. Never borrow more than you can repay if collateral drops 40-50% in value. For UK-based users, the absence of regulatory oversight means you have no consumer protections -- your security depends entirely on the smart contract code and your own risk management practices. Treat DeFi borrowing as an advanced financial activity and only commit capital you can afford to lose in a worst-case liquidation scenario.

Sources & References

• Compound Protocol Official Website
• Compound Protocol Documentation
• DeFiLlama - Compound TVL Statistics

Frequently Asked Questions

What is Compound borrowing?

Compound borrowing is a decentralised finance protocol that allows you to borrow cryptocurrencies using algorithmic interest rates, operating autonomously. It uses smart contracts without intermediaries. It has transparent and predictable borrowing costs.

How do Compound interest rates work?

Compound uses algorithmic interest rate models that automatically adjust in real time based on supply and demand. Rates increase when utilisation is high and decrease when liquidity is in excess. It is efficient market pricing.

What is COMP governance?

COMP is its governance token that allows holders to propose and vote on protocol changes. COMP tokens are distributed to users who supply or borrow assets on the platform, giving them a voice in protocol development.

Is Compound safe for borrowing?

It is one of the oldest and most battle-tested DeFi protocols with years of secure operation. However, it carries smart contract risks and liquidation risks. Market volatility risks are inherent to decentralised finance.

What assets can I borrow on Compound?

It supports borrowing of major cryptocurrencies. This includes USDC, DAI, ETH, WBTC, and USDT. It is other blue-chip assets. The selection focuses on established, liquid cryptocurrencies with proven track records.

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