Bitcoin-collateralised loans: complete guide to risks and options
Quick answer: You can borrow euros/USDC using Bitcoin as collateral at typical 30-50% LTV. Current platforms include Aave (DeFi), Ledn (CeFi), Nexo and Sygnum (crypto banking). Interest 6-12% per year. Main risk: forced liquidation if collateral price falls and LTV crosses the threshold.
"I hold Bitcoin and need liquidity for a purchase or investment, but I don't want to sell (paying tax) or lose my future upside."
A Bitcoin-collateralised loan lets you get euros, dollars or stablecoins without selling your BTC. You deposit Bitcoin on the platform, they lend you liquidity up to a percentage of collateral value (LTV, Loan-to-Value), and you repay with interest. If you don't repay or Bitcoin's price falls below the liquidation threshold, the platform auto-sells part of the collateral to cover the loan.
The appeal is twofold: (a) tax-wise it is NOT a Bitcoin sale, so no IRPF capital gains at loan initiation, and (b) you keep price exposure — if BTC rises, your collateral is worth more and you could even reduce LTV or extend the loan. It's what companies like MicroStrategy do at scale to finance without diluting shareholders or selling their BTC treasury.
The material and frequently underestimated risk is liquidation. Crypto loans operate with dynamic LTV based on real-time price. If Bitcoin drops 40% in 24h — which has happened multiple times in 2020, 2021 and 2022 — a loan initiated at 50% LTV can climb to 80% LTV and trigger automatic liquidation with 5-15% penalty.
Step-by-step guide
- 1
Compute your need and safety margins
Start with low LTV: 20-30% instead of 50-70%. A 25% LTV means Bitcoin can drop 50% before approaching liquidation. If you need €10,000 with €100,000 in BTC, 10% LTV gives massive cushion.
- 2
Choose the platform
Pure DeFi: Aave v3 (Ethereum, Arbitrum, Base) — no KYC, configurable LTV, variable rates, higher transparency. Regulated CeFi: Ledn (Canada), Nexo (Switzerland), Sygnum (Swiss banking) — with KYC, fixed rates, greater convenience. Each has specific counterparty risk.
- 3
Execute deposit and loan
On Aave: deposit WBTC or cbBTC (Bitcoin wrapped on Ethereum/Base), the platform enables credit in USDC/EURC/DAI up to your target LTV. On Ledn/Nexo: transfer native BTC, receive the loan in euros or USDC to your bank account or wallet in 1-3 days.
- 4
Set price alerts
Set alerts at 40% drop from your collateral entry price. On Aave you can see the real-time "Health Factor" — always keep >1.5 for margin against sudden drops.
- 5
Actively manage the loan
If Bitcoin drops and your LTV climbs to 60%, two options: (a) repay part of the loan to lower LTV, (b) add more collateral. Doing nothing until the threshold (typically 75-85%) triggers auto-liquidation with penalty.
- 6
Consider tax implications
The loan itself is not a taxable event. Interest paid on crypto loans is NOT deductible unlike mortgage interest. Forced collateral liquidation IS taxable: treated as a forced sale and taxed as normal capital gains (sale - FIFO cost).
Key takeaways
- A crypto loan is NOT a sale — no IRPF at loan initiation.
- Recommended LTV: 20-30% for a drop cushion.
- Aave (DeFi) offers transparency; Ledn/Nexo (CeFi) offer convenience.
- Price alerts + Health Factor > 1.5 are mandatory.
- Forced liquidation IS taxable with 5-15% penalty.
- Crypto loan interest is NOT IRPF-deductible.
Frequently asked questions
Can I pay my mortgage using a Bitcoin loan?
Technically yes. But a crypto loan usually charges 6-12% interest while a mortgage 3-5%. Refinancing a mortgage with a crypto loan rarely pays off given the rate spread. It can work as a 3-12 month bridge liquidity.
What if Bitcoin rises after taking the loan?
Your LTV drops automatically and you can: (a) keep the larger cushion, (b) extend the loan if you need more liquidity, (c) withdraw part of the now over-collateralised BTC. Ideal case.
Are Bitcoin loans on Aave permissionless?
Yes. Anyone with a wallet (MetaMask, Ledger) can access without KYC. But you first need to wrap Bitcoin as WBTC or cbBTC (technical process) and understand DeFi. For non-technical users, Ledn or Nexo are more accessible.
Is it safe to leave Bitcoin on Ledn / Nexo?
Less safe than your own Ledger, safer than a spot exchange. Ledn and Nexo legally segregate collateral into isolated accounts (unlike Celsius pre-bankruptcy). Counterparty risk still exists. Never keep >30% of your BTC on a single CeFi lender.
What interest is typically charged?
In 2026: Aave 4-8% variable in USDC, Ledn 8-12% fixed, Nexo 6-10% with NEXO-token discounts, Sygnum 4-7% (private banking, high minimums). Compare before deciding.
Bitcoin-collateralised loans are a powerful financial tool — only if used with low LTV and active monitoring. Before using any DeFi platform, review our guide on how to evaluate a protocol's safety.
How to evaluate DeFi protocols