A Bitcoin-backed loan (also called a bitcoin-collateralized or BTC-backed loan) lets you pledge your bitcoin as collateral and borrow US dollars or a stablecoin against it. You keep your upside exposure to bitcoin, you get liquidity now, and in most jurisdictions borrowing isn't a taxable sale. That's the pitch — and it's a real one. What follows is everything the pitch leaves out, written by people who track every lender rather than sell one.
How a Bitcoin-backed loan works
The mechanics are the same almost everywhere. You send bitcoin to the lender (or lock it in a smart contract or multisig vault). The lender extends a loan worth a fraction of that collateral's value and holds the rest as a buffer. You pay interest; when you repay the principal, you get your bitcoin back. If the value of your collateral falls too far, the lender sells some of it to protect the loan.
Three numbers define every loan: the loan-to-value ratio (LTV) you start at, the interest rate you pay, and the liquidation threshold at which your collateral gets sold. Everything else — term length, fees, custody — sits on top of those three.
LTV: the number that controls your fate
Loan-to-value is your loan amount divided by the market value of your collateral. Borrow $25,000 against $50,000 of bitcoin and you're at 50% LTV. It is the single most important number in the entire arrangement, because it moves every second the bitcoin price moves — and you don't control the price.
A lower starting LTV is safer: it leaves more room for bitcoin to fall before you're in trouble. A higher starting LTV gives you more cash per coin but a thinner safety margin. Most conservative lenders cap initial LTV around 50%; aggressive ones (often DeFi) allow 70–80%, which feels generous until the first sharp drawdown.
A real margin-call scenario
Numbers make this concrete. Say bitcoin is at $66,000 and you post 1 BTC as collateral to borrow $33,000 — a 50% starting LTV. Your lender issues a margin call at 70% LTV and liquidates at 80%.
So a 37.5% drop — unremarkable for bitcoin, which has done it many times — takes you from comfortable to liquidated. At the margin call ($47,143) you'd be asked to wire more collateral or repay part of the loan, usually within a tight window measured in hours, not days. Miss it and the next leg down forces a sale.
You can model your own numbers with the liquidation calculator on the dashboard — it shows the exact price at which you'd get the call and the price at which you'd be sold out, using the live bitcoin price.
What actually happens at liquidation — the part lenders skip
Lender marketing describes liquidation as a tidy safety mechanism. The borrower's reality is rougher:
- It happens at the worst time. Liquidations cluster during sharp sell-offs, so your coins are sold into a falling, illiquid market — frequently near a local bottom you'd never have chosen.
- It can be all-or-nothing. Some lenders sell only enough collateral to restore a safe LTV; others close the entire position on a single breach. Read which model applies before you borrow — with some providers a margin call means full liquidation, not a partial top-up.
- Fees stack on top. Liquidation penalties, spread, and slippage all come out of your collateral, not the lender's pocket.
- The tax bill survives. A forced sale is still a sale. You can lose the coins and owe capital-gains tax on the disposal.
Effective APR vs the headline rate
The advertised rate is a marketing number. The number that leaves your account is the effective APR — the stated rate plus every fee, over the actual term you borrow for. Common gaps between the two:
- Origination and admin fees — a 1–2% upfront fee can add meaningfully to a short loan's true cost.
- Tiered pricing — the lowest advertised rate often applies only to very large loans; smaller borrowers pay more.
- Token discounts — some platforms show their best rate only if you hold and stake their own token, which carries its own risk.
- Network / gas costs — on DeFi, you pay to open, adjust, and close the position, and during congestion that isn't trivial.
A "9%" loan with a 2% origination fee repaid in six months has an effective cost closer to 13% annualized. Always compare lenders on effective APR for your loan size and term, not on the banner number. The comparison table shows both the headline and an indicative effective APR for every lender.
Custody: who actually holds your coins
This is where Bitcoin-backed loans differ most, and where borrowers pay the least attention. Three broad models:
| Model | What it means | Borrower risk |
|---|---|---|
| Segregated custodial | Lender (or a qualified custodian) holds your BTC in a dedicated account, not pooled or lent out. | Lower — but you still rely on the custodian's solvency and security. |
| Collaborative multisig | Collateral sits in a 2-of-3 (or similar) vault where you hold a key. The lender can't move it unilaterally. | Lowest counterparty risk; you can't be quietly rehypothecated. |
| Pooled / rehypothecated | Your BTC is commingled and may be lent out or re-posted elsewhere to generate yield. | Highest — your collateral's safety now depends on third parties you never chose. |
"Not your keys, not your coins" doesn't disappear because you took a loan — it intensifies, because now someone else has both your keys and a financial incentive to do something with them.
Rehypothecation, in plain language
Rehypothecation is when the lender takes the collateral you posted and uses it again — lending it to a trading desk, posting it with a funding partner, or otherwise putting it to work to earn extra yield. It's legal and common in traditional finance. In crypto it has a darker track record: several collapsed lenders had quietly re-pledged customer collateral, so when their counterparties failed, customer coins were gone too.
The practical test: ask the lender, in writing, "Is my collateral ever lent out, re-pledged, or re-posted to a third party?" A clear no, backed by the terms of service, is worth more than any marketing page.
CeFi vs DeFi: two different risk shapes
Centralized (CeFi) lenders are companies — Ledn, Nexo, Strike, Unchained and others — with support desks, fixed terms, and human underwriting. Decentralized (DeFi) protocols — Aave, Compound, Morpho — are smart contracts you borrow from directly, with no company in the middle.
CeFi — what you trade
- Fixed rates and terms, predictable payments
- Human support and fiat rails
- Trust the company's solvency and custody
- Possible rehypothecation; KYC required
DeFi — what you trade
- Non-custodial; you keep control, no KYC
- Transparent, on-chain rules
- Variable rates that spike with demand
- Smart-contract risk, gas costs, self-managed liquidation
Neither is "safer" in the abstract — they fail in different ways. CeFi fails through insolvency and misused collateral; DeFi fails through code exploits and brutal automated liquidations. Match the model to the risk you actually understand.
Who a Bitcoin-backed loan is right for — and wrong for
Good fit
- Long-term holders who need cash but don't want to sell or trigger tax
- Borrowers who'll keep LTV low and can top up collateral fast
- People funding a short, defined need with a clear repayment plan
Poor fit
- Anyone who'd be financially ruined by losing the collateral
- Borrowing at high LTV and hoping bitcoin only goes up
- Using the loan to buy more bitcoin (leverage on leverage)
- Anyone who hasn't read the custody and liquidation terms
Frequently asked questions
What is a Bitcoin-backed loan?
A loan where you pledge bitcoin as collateral to borrow cash or a stablecoin without selling your BTC. You keep upside exposure and avoid a taxable sale, but the collateral can be liquidated if its value falls too far relative to the loan.
What happens to my Bitcoin if the price drops?
Your LTV rises as the price falls. Most lenders issue a margin call at a set LTV asking you to add collateral or repay; if the price reaches the liquidation LTV, they sell enough bitcoin to bring the loan back in line — often into a falling market.
Is the advertised interest rate the real cost?
Usually not. Headline APR rarely includes origination/admin fees or gas, and the lowest rate often requires a large loan or holding the lender's token. Compare on effective APR — rate plus fees over your actual term.
Does the lender reuse my collateral?
Depends on the custody model. Some segregate collateral, some use collaborative multisig where you hold a key, and some rehypothecate — re-posting or lending your coins to third parties. Ask in writing and prefer segregated or multisig models.
Are Bitcoin loans taxable?
Borrowing itself generally isn't a taxable event in most jurisdictions, which is a key appeal. But a forced liquidation is a sale and can create a taxable gain. This is general information, not tax advice — confirm with a professional for your situation.
Read next: now that you know the mechanics, see why holders borrow against Bitcoin without selling — and the tax reason, how Bitcoin miners raise capital without selling their treasury, exactly what happens when a loan gets liquidated (and how to avoid it), whether a Bitcoin loan is taxable, learn how to compare Bitcoin lenders on APR, LTV, and liquidation risk, see a head-to-head of Ledn vs Strike, or find the best lenders for a $100,000 loan.
Compare every Bitcoin lender in one table
Rates, effective APR, max LTV, liquidation thresholds, custody model, and risk — verified against each lender's own terms, with a source link on every row. Plus a live loan and liquidation calculator.
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